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Q1. A huge collection of billions of stars, dust and gases held together by gravity is called a:
A galaxy is an enormous system that contains billions of stars, along with clouds of dust and gas, all bound together by the force of gravity. Galaxies come in different shapes like spiral, elliptical and irregular. Our solar system is just a tiny part of the Milky Way galaxy, which contains over 100 billion stars.
Q2. The galaxy in which our solar system is located is called the:
The Milky Way is a large spiral-shaped galaxy that contains our Sun and all its planets. It appears as a hazy, milky white band of light stretching across the night sky, which is why it is called the Milky Way. Our solar system is located about 26,000 light-years away from the centre of this galaxy.
Q3. A constellation is a:
A constellation is a recognizable group of stars that form a particular pattern or shape in the night sky. Ancient people named these patterns after animals, mythical creatures, heroes and objects that they resembled. These patterns help astronomers and stargazers locate and identify stars in the sky.
Q4. The constellation also known as the Great Bear is:
Ursa Major, which means ‘Great Bear’ in Latin, is one of the most famous and easily recognizable constellations in the northern sky. It looks like a large bear and contains the famous Saptarishi, which are seven bright stars that form a shape like a plough or a dipper. This constellation is visible throughout the year in most parts of the northern hemisphere.
Q5. The Ursa Major constellation is also known as:
In Indian astronomy, Ursa Major is called Saptarishi because it has seven main stars that represent the seven great sages or rishis. It is also called the Plough or Big Dipper because the arrangement of its seven brightest stars looks like an old farming tool or a large ladle. This constellation is one of the easiest to spot in the night sky.
Q6. The constellation also known as the Little Bear is:
Ursa Minor means ‘Little Bear’ in Latin and is a smaller version of the Great Bear constellation. It is important because it contains the North Star, also called Polaris, at the end of its tail. Polaris is very useful for navigation because it always points towards the geographic north.
Q7. Ursa Minor is also known as:
Ursa Minor is called Laghu Saptarishi in Indian astronomy, which means ‘the smaller seven sages’. It is a smaller version of the Saptarishi (Ursa Major) and contains the North Star at the tip of its tail. This constellation is not as bright as its larger counterpart but is still very important for finding directions.
Q8. The constellation that looks like a hunter is:
Orion is one of the most prominent and easily recognizable constellations in the winter sky. It resembles a mighty hunter with a club in one hand and a shield in the other, and has three bright stars in a straight line that form his belt. Many ancient civilizations told stories about this hunter and his adventures in the sky.
Q9. Orion is also known as:
In Indian astronomy, Orion is called Vyadh (meaning the hunter) or Mriga (meaning the deer). The constellation is associated with the story of a hunter chasing a deer in the sky. This constellation is best visible during the winter months and is one of the most beautiful in the night sky.
Q10. The constellation that looks like a queen sitting on a throne is:
Cassiopeia is a prominent constellation in the northern sky that looks like a bright ‘W’ or ‘M’ shape. In Greek mythology, it represents Cassiopeia, a beautiful but vain queen who boasted about her beauty and was punished by the gods. This constellation is visible throughout the year in the northern hemisphere and is easy to identify.
Q11. Cassiopeia is also known as:
Cassiopeia is called Sarmishtha in Indian astronomy, named after a queen in ancient Indian mythology. The ‘W’ shape of this constellation makes it very easy to recognize in the night sky. It is located opposite the Big Dipper and is used by astronomers to find the North Star.
Q12. The constellation that looks like a scorpion is:
Scorpius is a beautiful constellation that looks like a large scorpion with a curved tail and a bright red star called Antares at its heart. It is one of the zodiac constellations and is best visible during the summer months in the southern sky. The shape of this constellation is very clear and resembles the animal it is named after.
Q13. Scorpius is also known as:
Scorpius is called Vrishchika in Indian astronomy, which means ‘the scorpion’ in Sanskrit. It is the eighth sign of the zodiac and is associated with the month of November. The constellation is known for its bright red star Antares, which means ‘rival of Mars’ because of its reddish colour.
Q14. The Pleiades is a cluster of stars also known as:
The Pleiades is a beautiful open star cluster that appears as a small group of six or seven bright stars in the night sky. In Indian astronomy, it is called Kruttika and is associated with the six mothers of the war god Kartikeya. This cluster is one of the closest and most visible star clusters to Earth and can be seen with the naked eye.
Q15. The constellation that contains the star Sirius, the brightest star in the night sky, is:
Canis Major, meaning ‘Greater Dog’ in Latin, is a constellation that contains the brightest star in the night sky, called Sirius. Sirius is often called the ‘Dog Star’ and is over 20 times brighter than our Sun. It is located in the southern sky and is best visible during the winter months.
Q16. The North Star, which always points to the north, is found in which constellation?
The North Star, also called Polaris, is the brightest star in the Ursa Minor constellation and is located at the end of its tail. It is extremely important for navigation because it stays fixed in the same position in the northern sky while all other stars appear to rotate around it. Sailors and travellers have used the North Star to find their way for thousands of years.
Q17. An Astronomical Unit (AU) is the distance between:
One Astronomical Unit (AU) is the average distance from the centre of the Earth to the centre of the Sun, which is about 150 million kilometres. This unit is used by astronomers to measure distances within our solar system. For example, Jupiter is about 5.2 AU from the Sun, which means it is 5.2 times farther from the Sun than the Earth is.
Q18. The Sun is a:
The Sun is a medium-sized yellow star that is the centre of our solar system. It is a huge ball of hot, glowing gases that produces its own light and heat through nuclear fusion. Compared to other stars, the Sun is average in size and brightness, but it is the most important celestial body for life on Earth.
Q19. The Sun produces energy through a process called:
Nuclear fusion is the process where two or more smaller atomic nuclei combine to form a larger nucleus, releasing an enormous amount of energy in the process. In the Sun’s core, hydrogen atoms fuse together to form helium, and this reaction releases light and heat. This process has been happening for about 4.6 billion years and will continue for another 5 billion years.
Q20. A celestial body that revolves around the Sun is called a:
A planet is a large, round celestial body that orbits a star like the Sun and does not produce its own light. Planets shine by reflecting the light of the Sun they orbit. There are eight planets in our solar system, each with its own unique characteristics and orbit.
Q21. The path on which a planet revolves around the Sun is called its:
An orbit is the curved, elliptical path that a planet takes as it travels around the Sun. Each planet has its own distinct orbit at different distances from the Sun, and these orbits are maintained by the gravitational pull of the Sun. The shape of an orbit is slightly oval or elliptical, not a perfect circle.
Q22. A celestial body that revolves around a planet is called a:
A satellite is any object that orbits a planet or other larger body in space. Natural satellites are created by nature, like the Moon orbiting Earth, while artificial satellites are man-made machines launched into orbit. There are over 200 known natural satellites in our solar system orbiting different planets.
Q23. The largest planet in our solar system is:
Jupiter is the largest planet in our solar system, with a diameter of about 143,000 kilometres, which is about 11 times wider than Earth. It is so massive that it could fit all the other planets inside it and still have space left over. Jupiter is a gas giant, meaning it is mostly made of hydrogen and helium gases.
Q24. The smallest planet in our solar system is:
Mercury is the smallest planet in our solar system with a diameter of about 4,879 kilometres, which is only slightly larger than Earth’s Moon. It is a rocky terrestrial planet with a surface full of craters, similar to our Moon. Mercury is also the closest planet to the Sun.
Q25. The planet closest to the Sun is:
Mercury is the closest planet to the Sun, orbiting at an average distance of about 58 million kilometres. Because it is so close to the Sun, it takes only 88 Earth days to complete one full revolution. Mercury has extreme temperatures, going from very hot during the day to freezing cold at night.
Q26. The planet farthest from the Sun is:
Neptune is the farthest planet from the Sun in our solar system, located about 4.5 billion kilometres away on average. It takes about 165 Earth years to complete just one orbit around the Sun. Neptune is an ice giant and is known for its strong winds and dark blue colour.
Q27. The planets in the correct order from the Sun are:
The planets are arranged according to their distance from the Sun, starting with the closest, Mercury, and ending with the farthest, Neptune. A popular mnemonic to remember this order is “My Very Educated Mother Just Served Us Noodles.” This order helps us understand the structure and scale of our solar system.
Q28. The planet known as the “Red Planet” is:
Mars is called the Red Planet because of its reddish appearance in the night sky, which comes from iron oxide or rust on its surface. It is the fourth planet from the Sun and is about half the size of Earth. Mars has been a major focus of space exploration because scientists believe it may have once had liquid water on its surface.
Q29. The planet known as the “Morning Star” or “Evening Star” is:
Venus is the brightest planet visible from Earth and is often seen just after sunset in the evening or just before sunrise in the morning, which is why it is called the Morning or Evening Star. It is covered by thick clouds of carbon dioxide that trap heat, making it the hottest planet in our solar system. Venus is similar in size to Earth but rotates in the opposite direction.
Q30. The planet with the most prominent rings around it is:
Saturn is famous for its spectacular and bright ring system that encircles the planet like a giant disk. These rings are made up of billions of small particles of ice and rock, ranging in size from tiny dust grains to large boulders. Saturn’s rings are the most visible and beautiful of all the planets in our solar system.
Q31. The natural satellite of Earth is the:
The Moon is the only natural satellite of Earth, meaning it is a celestial body that orbits our planet naturally. It is the fifth largest moon in the solar system and is about one-quarter the size of Earth. The Moon has no atmosphere, no water and its surface is covered with craters from meteoroid impacts.
Q32. A natural satellite is a celestial body that:
A natural satellite is a celestial body that orbits a planet or other larger body without any human intervention. These bodies are created by nature and include moons that orbit planets in our solar system. Natural satellites vary greatly in size, shape and composition.
Q33. Artificial satellites are:
Artificial satellites are machines built by humans and launched into space using rockets. They orbit Earth and are used for many purposes like communication, weather forecasting, television broadcasting and navigation. The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957.
Q34. Small rocky bodies that orbit the Sun, mainly found between Mars and Jupiter, are called:
Asteroids are small, rocky bodies that revolve around the Sun, most of which are found in the asteroid belt between Mars and Jupiter. They are irregularly shaped and vary in size from a few metres to hundreds of kilometres across. Asteroids are leftover materials from the formation of our solar system about 4.6 billion years ago.
Q35. The asteroid belt is located between the orbits of:
The asteroid belt is a region in our solar system located between the orbits of Mars and Jupiter where millions of asteroids are found. This belt contains leftover materials that never formed into a planet because of Jupiter’s strong gravity. The total mass of all the asteroids in the belt is less than the mass of Earth’s Moon.
Q36. A comet is a celestial body made of:
A comet is a celestial body made of frozen gases, ice, dust and rocky particles, often described as a “dirty snowball.” When a comet comes close to the Sun, its frozen materials heat up and release gas and dust, forming a glowing head and a long tail. Comets have highly elliptical orbits and can take hundreds or thousands of years to complete one orbit around the Sun.
Q37. When a comet comes close to the Sun, it develops a:
When a comet approaches the Sun, the heat causes the frozen ice inside the comet to turn into gas, releasing dust and creating a glowing head called the coma. The solar wind pushes the gas and dust away from the Sun, forming a bright tail that can stretch for millions of kilometres. The tail always points away from the Sun, regardless of the comet’s direction of travel.
Q38. The Universe contains:
The Universe is everything that exists, including all galaxies, stars, planets, moons, dust, gases, dark matter, dark energy and all forms of energy. It is unimaginably vast and constantly expanding outward. Scientists estimate that there are over 100 billion galaxies in the observable universe.
Q39. Stars appear to twinkle because:
Stars appear to twinkle because their light travels through Earth’s atmosphere, which is made of moving layers of air with different temperatures and densities. These layers bend the light in different directions, making the stars appear to flicker or twinkle. Planets, being closer to Earth, do not twinkle because their light does not bend as much.
Q40. Planets do not twinkle because:
Planets are much closer to Earth than stars, so they appear as tiny disks rather than single points of light. The light from planets does not bend as much through the atmosphere, so they appear steady and do not twinkle. This is one way to distinguish planets from stars in the night sky.
Q41. The number of planets in our solar system is:
Our solar system officially has eight planets that revolve around the Sun. These are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Pluto was previously considered the ninth planet but was reclassified as a dwarf planet in 2006 by the International Astronomical Union.
Q42. The largest satellite (moon) in the solar system is:
Ganymede is the largest moon in the entire solar system and orbits the planet Jupiter. It has a diameter of about 5,268 kilometres, making it even larger than the planet Mercury. Ganymede is one of Jupiter’s four Galilean moons and has a magnetic field and an underground ocean of salty water.
Q43. A planet that is not a gas giant but has a thick carbon dioxide atmosphere is:
Venus has an extremely thick atmosphere composed mostly of carbon dioxide, which creates a strong greenhouse effect. This makes Venus the hottest planet in our solar system, with surface temperatures hot enough to melt lead. Venus is a terrestrial or rocky planet, not a gas giant.
Q44. The gas that makes up most of Jupiter and Saturn is:
Jupiter and Saturn are known as gas giants because they are composed mainly of hydrogen and helium gases. These planets have no solid surfaces like Earth; instead, their gases become denser and eventually turn into liquid metal hydrogen near the core. Hydrogen and helium are the two most abundant elements in the universe.
Q45. The Milky Way galaxy is shaped like a:
The Milky Way is a spiral galaxy, meaning it has a central bulge surrounded by flat, rotating arms that spiral outward like a pinwheel. These arms contain stars, gas and dust, and our solar system is located in one of these arms called the Orion Arm. Spiral galaxies are one of the most common types of galaxies in the universe.
Q46. The year is the time taken by the Earth to:
A year is defined as the time it takes for Earth to complete one full revolution around the Sun, which is about 365.25 days. This is why we have a leap year every four years to make up for the extra quarter day. During this time, we experience the four seasons.
Q47. The distance between Earth and the Sun is about:
The average distance from Earth to the Sun is approximately 150 million kilometres, which is also known as one Astronomical Unit (AU). Light from the Sun takes about 8 minutes and 20 seconds to reach Earth, travelling at a speed of 300,000 kilometres per second. This distance is just right to maintain Earth’s temperature for life to exist.
Q48. Our solar system is a part of the:
Our solar system, with its Sun and eight planets, is located in the Milky Way galaxy. The Milky Way is a spiral galaxy that contains about 200 to 400 billion stars, along with planets, dust and gas. Our solar system is located about 26,000 light-years from the galactic centre, in one of the galaxy’s outer arms.
Q49. A light-year is the distance:
A light-year is a unit of astronomical distance equal to the distance light travels in one year. Since light travels at about 300,000 kilometres per second, one light-year equals approximately 9.5 trillion kilometres. This unit is used to measure the vast distances between stars and galaxies.
Q50. An astonishing fact about the Universe is that:
One of the most astonishing discoveries about the Universe is that it is constantly expanding, meaning galaxies are moving away from each other. This expansion was discovered by astronomer Edwin Hubble in 1929 and suggests that the Universe began with a single event called the Big Bang. The Universe continues to expand even today, and we cannot see its edge because it is so vast.
Q51. The pole star (Polaris) is located in which constellation?
Polaris, the North Star, is located at the end of the handle of the Ursa Minor constellation, which is also called the Little Bear. It is a bright star that remains almost stationary in the sky while all other stars appear to rotate around it. This property has made Polaris a useful guide for navigation for centuries, especially for sailors and travellers in the northern hemisphere.
Q52. The Great Bear constellation has how many main stars visible to the naked eye?
Ursa Major, or the Great Bear, has seven main stars that are easily visible to the naked eye, forming a shape like a plough or a large dipper. These seven stars are known as the Saptarishi in Indian astronomy and are among the most recognized star patterns in the night sky. The four stars forming the bowl and three stars forming the handle make this constellation easy to identify.
Q53. The Hunter constellation (Orion) has three bright stars that form his:
Orion is easily recognized in the night sky by the three bright stars in a straight line that form his belt. These three stars, known as the “Three Kings” or “Three Marys,” are very close together and make Orion one of the most identifiable constellations. Below the belt, there is a fainter line of stars representing his sword, where a nebula called the Orion Nebula is located.
Q54. The rings of Saturn are made of:
Saturn’s rings are not solid structures but are made up of billions of small particles, mostly ice and rocky debris. These particles range in size from tiny dust grains to large boulders several metres across. The rings are held in place by Saturn’s gravity and orbit the planet like a flat, disc-shaped cloud.
Q55. The planet that rotates on its side compared to other planets is:
Uranus is unique among the planets because it rotates on its side, with its axis tilted at an angle of about 98 degrees. This means that Uranus essentially rolls around the Sun on its side rather than spinning upright like other planets. This unusual tilt is thought to have been caused by a massive collision with another large object early in its history.
Q56. The word “planet” comes from a Greek word meaning:
The word “planet” comes from the ancient Greek word “planetes,” which means “wanderer.” The ancient Greeks noticed that unlike the fixed stars, these bright points of light moved across the sky over time. They called them wanderers because they seemed to wander among the stars.
Q57. The closest star to Earth after the Sun is:
Proxima Centauri is the closest known star to our solar system, located approximately 4.24 light-years away from Earth. It is a red dwarf star that is part of the Alpha Centauri star system, which also includes the stars Alpha Centauri A and B. Despite being the closest star, Proxima Centauri is too faint to be seen with the naked eye.
Q58. A group of stars that appears to form a pattern in the sky is called a:
A constellation is a group of stars that are close enough in the night sky to form a recognizable pattern or shape. These patterns help astronomers identify stars and navigate the night sky. There are 88 officially recognized constellations in modern astronomy, each with its own boundaries and stories.
Q59. The four inner planets (Mercury, Venus, Earth, Mars) are called:
The four inner planets, Mercury, Venus, Earth and Mars, are called terrestrial planets because they have solid, rocky surfaces like Earth. They are also smaller in size and have fewer moons compared to the outer planets. These planets are closest to the Sun and are composed mainly of rock and metal.
Q60. The four outer planets (Jupiter, Saturn, Uranus, Neptune) are called:
The four outer planets, Jupiter, Saturn, Uranus and Neptune, are called gas giants because they are mostly made up of gases like hydrogen and helium, with no solid surfaces. They are much larger than the terrestrial planets and have thick atmospheres and many moons. These planets are also known for their ring systems and are located far from the Sun.
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Q61. The celestial body that is made of ice and dust and develops a tail near the Sun is a:
A comet is a small celestial body made of frozen gases, water ice, dust and rocky materials that orbits the Sun in a highly elliptical path. When it approaches the Sun, the heat causes the frozen materials to sublimate, releasing gas and dust that form a glowing atmosphere called a coma and a long tail. Comets are sometimes called “dirty snowballs” because of their composition.
Q62. The year on Mars is about how many Earth days?
Mars takes about 687 Earth days, which is about 1.88 Earth years, to complete one revolution around the Sun. This is because Mars is farther from the Sun than Earth, so its orbit is longer. A Martian year is almost twice as long as an Earth year.
Q63. The first man-made satellite launched into space was:
Sputnik 1 was the first artificial satellite successfully launched into space by the Soviet Union on October 4, 1957. It was a small sphere that transmitted radio signals back to Earth for about three weeks. The launch of Sputnik 1 marked the beginning of the Space Age and the competition between nations to explore space.
Q64. The number of moons (natural satellites) of Earth is:
Earth has only one natural satellite, which is the Moon. It is the fifth largest moon in the solar system and is about one-quarter the size of Earth. The Moon plays an important role in creating tides in our oceans and also influences Earth’s rotation.
Q65. The planet that has the most moons (natural satellites) is:
Jupiter currently has 95 known moons, making it the planet with the most natural satellites in our solar system. Its four largest moons, called the Galilean moons (Io, Europa, Ganymede and Callisto), were discovered by Galileo Galilei in 1610. These moons are some of the largest objects in the solar system and have unique features like volcanoes and underground oceans.
Q66. The known universe is made up of billions of:
The Universe is unimaginably vast and contains billions of galaxies, each of which contains billions of stars and planets. It is estimated that there are more than 100 billion galaxies and 100 billion planets in just our Milky Way galaxy alone. The universe is truly enormous and continues to amaze scientists with its size and complexity.
Q67. The temperature at the centre of the Sun is about:
The core of the Sun is extremely hot, with temperatures reaching about 15 million degrees Celsius. This incredible heat and pressure create the perfect conditions for nuclear fusion, where hydrogen atoms combine to form helium, releasing massive amounts of energy. This energy travels outward from the core and eventually reaches Earth as sunlight.
Q68. The fastest planet to revolve around the Sun is:
Mercury is the fastest planet in our solar system because it is the closest to the Sun and has the shortest orbit. It travels around the Sun at an average speed of about 48 kilometres per second and completes one revolution in just 88 Earth days. The speed of a planet depends on its distance from the Sun; closer planets move faster.
Q69. The slowest planet to revolve around the Sun is:
Neptune is the slowest moving planet because it is the farthest from the Sun and has the largest orbit. It travels at an average speed of about 5.4 kilometres per second and takes about 165 Earth years to complete one revolution. The outer planets move much more slowly than the inner planets because they have much longer distances to travel.
Q70. The Moon’s gravity is about one-sixth of Earth’s gravity because the Moon:
The Moon’s gravity is weaker than Earth’s because it is smaller and has less mass. The gravitational force of an object depends on its mass; the more mass an object has, the stronger its gravitational pull. Because the Moon has only about 1/81 of Earth’s mass, its gravity is only one-sixth as strong, meaning a person would weigh much less on the Moon.