Solar System

191.	The only satellite of the earth is –
	A. Demos
	B. Moon
	C. Titan
	D. Lapets Option “B” is correct. The Moon is an astronomical body that orbits planet Earth and is Earth’s only permanent natural satellite.

192.	Where is the calm sea and the ocean of storms located?
	A. Moon
	B. Mercury
	C. Jupiter
	D. Uranus Option “A” is correct. The Ocean of Storms (Oceanus Procellarum) on the moon is a vast volvanic plain on the western edge of the moon’s near side.

193.	Where is ‘Sea of Tranquility’?
	A. Earth
	B. Sun
	C. Jupiter
	D. Moon Option “D” is correct. Mare Tranquillitatis in Latin, the Sea of Tranquility is found in the Tranquillitatis basin of the Moon and is composed of basalt.

194.	In how many days does the Moon orbit the Earth?
	A. about 28.1 days
	B. about 30.2 days
	C. about 27.3 days
	D. about 28.3 days Option “C” is correct. The Moon’s orbit, which takes 27 days, 7 hours and 43 minutes to go full circle. It causes the Moon to move 12–13 degrees east every day. This shift means Earth has to rotate a little longer to bring the Moon into view, which is why moonrise is about 50 minutes later each day

195.	The time taken by the light to reach from the moon to the earth is –
	A. one second
	B. less than a second
	C. more than two seconds
	D. less than two seconds Option “D” is correct. Light travels through space at just over 186,000 miles per second. The moon is just under 250,000 miles from Earth, so light from the Moon’s surface has to travel more than one second (about 1.3 seconds) to reach earth.

196.	Which of the following celestial body is called ‘Son of Earth’?
	A. Uranus
	B. Jupiter
	C. Moon
	D. Mars Option “C” is correct.

197.	The mass of Jupiter is approximately –
	A. 10th the mass of the Sun
	B. 1000th the mass of the Sun
	C. 100th the mass of the Sun
	D. half the mass of the sun Option “B” is correct. Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass more than two and a half times that of all the other planets in the Solar System combined, while being slightly less than one-thousandth the mass of the Sun.

198.	The brightest star in the sky is-
	A. Proxima century
	B. Bernard
	C. Nebula
	D. Sirius Option “D” is correct. , also known as the Dog Star or Sirius A, is the brightest star in Earth’s

199.	The period of Halley’s comet is –
	A. 66 years
	B. 76 years
	C. 86 years
	D. 96 years Option “B” is correct. Halley’s orbit period is, on average, 76 Earth years. This corresponds to an orbital circumference around the Sun of about 7.6 billion miles (12.2 billion kilometers). The period varies from appearance to appearance because of the gravitational effects of the planets.

200.	How much time does it take for the light of the nearest star to the earth except the sun to reach the earth?
	A. 4.5 hours
	B. 4.5 days
	C. 4.5 months
	D. 4.5 years Option “D” is correct. In our Solar System, we see light from our sun reflected off the planets. In more distant galaxies, light from many millions of stars takes a long time to reach the Earth. It takes light 4.5 years to reach the Earth from Sirius, a near neighbouring star

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