Free Astronomy and Space MCQs with Answers

161. What is the average distance of the moon from earth?

• A. 384,400 km
• B. 350,000 km
• C. 380,200 km
• D. 384,500 km

Explanation: The Moon’s mean distance from Earth is about 384,400 kilometres. Its orbit is elliptical, so the actual distance varies between roughly 356,500 and 406,700 kilometres.

162. Moon is the _______ satellite of the Earth?

• A. Natural
• B. Artificial
• C. Navigation
• D. None of these

Explanation: The Moon is a natural satellite because it occurs naturally and revolves around Earth. Artificial satellites are human-made objects launched into orbit.

163. Temperature of Sun in Celsius Scale is 6000ºC & in Fahrenheit is _____________?

• A. 8000 F
• B. 9000 F
• C. 10,832 F
• D. None of these

Explanation: Converting 6000°C gives 6000 × 9/5 + 32 = 10,832°F. The Fahrenheit value is higher because the Fahrenheit scale has both a different interval size and a different zero point.

164. Who discovered that the earth was not the center of the universe?

• A. Aristotle
• B. Nicolaus Copernicus
• C. Sir Isac Newton
• D. None

Explanation: Nicolaus Copernicus proposed the heliocentric model, placing the Sun rather than Earth at the centre of the planetary system. Aristotle supported the older Earth-centred view.

165. Sunsets on Mars are _________?

• A. Red
• B. Blue
• C. Yellow
• D. Orange

Explanation: Mars usually has blue sunsets because fine dust in its atmosphere scatters red light away from the setting Sun and allows bluish light to dominate near the Sun. This is opposite to the familiar reddish sunsets on Earth.

166. Only planet whose day is longer than its year is__________?

• A. Mercury
• B. Neptune
• C. Venus
• D. None of These

Explanation: Venus rotates so slowly that one rotation takes about 243 Earth days, whereas its orbit around the Sun takes about 225 days. Thus its sidereal day is longer than its year.

167. What is the name of the Active asteroid discovered near Jupiter?

• A. 2019 Jup1036
• B. 2019 JR10A
• C. 2019 LD2
• D. 2019 AA1

Explanation: 2019 LD2 is an active asteroid found near Jupiter's orbit. It attracted attention because it showed comet-like activity despite being classified as an asteroid.

168. An active asteroid is discovered near ________ Orbit for the first time in billion years.

• A. Saturn
• B. Mars
• C. Neptune
• D. Jupiter

Explanation: The reported active asteroid was discovered near Jupiter's orbit. Jupiter is the largest planet and has a broad region of small bodies associated with its orbital neighbourhood.

169. Sagittarius-A, the Blackhole at the centre of the Milky Way Galaxy is at a distance of_________?

• A. 25500 Lightyears
• B. 24500 Lightyears
• C. 23640 Lightyears
• D. 25640 Lightyears Physics

Explanation: Sagittarius A* lies roughly 26,000 light-years from Earth, and 25,640 light-years is the closest option. Modern estimates commonly give a value near 26,700 light-years.

170. The Renaissance scientist who explained how planets moved around the sun was

• A. Kepler
• B. Rebelais
• C. Francis Bacorr
• D. Gutenber

Explanation: Kepler used observations to formulate the three laws of planetary motion, showing that planets move in elliptical orbits around the Sun. His work refined the Sun-centred model of the Solar System.