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Science Who proposed the heliocentric model of the universe? Tycho Brahe Nicolaus Copernicus Ptolemy Archimedes The period of revolution of planet A around the Sun is 8 times that of planet B. How many times is the distance of planet A as great as that of planet B? 4 5 2 3 The Big Bang occurred ________ years ago. 13.7 billion 15 million 15 billion 20 million The speed of Sun in km/s is _______. India’s first satellite is _______. The number of planets in our Solar System is _______. The distance between Saturn and Uranus is about 10 times as that between Earth and Mars. Halley’s comet appears after nearly 67 hours. Mars is called the red planet. Jupiter 87.97 days Mercury 24 hours 37 min Venus 10.7 hours Saturn 243 days Mars 9 hours 55 min Why do some stars appear blue and some red? How is a satellite maintained in nearly circular orbit? What is solar system? Define orbital velocity. State Kepler’s laws. Discuss the benefits of ISS.
Universe Book Back Questions
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