Ans. Jupiter, Saturn and Uranus have rings around them. These are belts of small debris.
Ans. The word ‘planet’ comes from the Greek word “Planetai” which means ‘wanderers’.
Ans. In ancient times, people used to determine directions during the night with the help of stars.
Ans. Scientists are of the view that asteroids are parts of a planet which exploded many years back.
Ans. The small pieces of rocks which move around the sun are called meteoroids.
Ans. Neil Armstrong was the first man to step on the surface of the moon on 21 July 1969.
Ans. A group of stars forming a recognizable pattern is called constellation. Ursa Major or Big Bear is one such constellation.
Ans. One of the most easily recognizable constellations is the small bear or Saptarishi (Sapta-seven, rishi-sages).
Ans. It is because the very bright light of the sun does not allow us to see all these bright objects of the night sky.
Ans. The sun, the moon and all those objects shining in the night sky are called celestial bodies.
Ans. From the outer space, the earth appears blue because its two-thirds surface is covered by water.
Ans. From the outer space, the earth appears blue because its two-thirds surface is covered by water.
Ans. In ancient India, it was imagined to be a river of light flowing in the sky. Thus, it was named Akash Ganga.
Ans. A Satellite is a celestial body that moves around the planets in the same way as the planets move around the sun.
Ans. Venus is considered as ‘Earth’s-twin’ because its size and shape are very much similar to that of the earth.
Ans. A galaxy is a huge system of billions of stars, and clouds of dust and gases. There are millions of such galaxies that make the Universe.
Ans. All the eight planets of the solar system move around the sun in fixed paths. These paths are elongated. They are called orbits.
Ans. Mercury is nearest to the sun. It takes only about 88 days to complete one round along its orbit.
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