Free Astronomy and Space MCQs with Answers

151. The nearest Star to the planet earth is ________ ?

• A. Regel
• B. Canopus
• C. Sun
• D. Betelgeuse

Explanation: The Sun is the nearest star to Earth, at an average distance of about 1 astronomical unit. The other listed objects are much more distant stars.

152. Which Civilization developed & implemented the first solar calendar?

• A. Babylonian
• B. Greek
• C. Egyptian
• D. Aztec

Explanation: The ancient Egyptians developed an early solar calendar based on a 365-day year, linked partly to the annual flooding of the Nile and the seasonal appearance of Sirius. Babylonian calendars were primarily lunisolar.

153. The mean distance of the earth from the sun is astronomical units is____________?

• A. 3.7 AU
• B. 10 AU
• C. 1 AU
• D. 101 AU

Explanation: One astronomical unit is defined approximately as the mean Earth-Sun distance, about 149.6 million kilometres. Therefore Earth’s average distance from the Sun is 1 AU.

154. The first and largest asteroid discovered was__________?

• A. Pallas
• B. Juno
• C. Ceres
• D. Trojan

Explanation: Ceres was the first asteroid discovered, in 1801, and it remains the largest object in the asteroid belt. It is now classified as a dwarf planet as well as a main-belt object.

155. which of the following planets has no moons ?

• A. Mars
• B. Neptune
• C. Venus
• D. None of these

Explanation: Venus has no natural moons, like Mercury. Mars has two moons, while Neptune has multiple moons.

156. A pulsar is actually a___________?

• A. Black hole
• B. White dwarf
• C. Red giant
• D. Neutron star

Explanation: A pulsar is a rapidly rotating neutron star whose beams of radiation sweep past Earth like a lighthouse. Its regular pulses distinguish it from a black hole, white dwarf or red giant.

157. The andromeda Galaxy is which type of the following types of galaxies ?

• A. Elliptical
• B. Spiral
• C. Irregular
• D. None of these.Biological Sciences

Explanation: The Andromeda Galaxy is a spiral galaxy, specifically a barred spiral classified as type Sb. Elliptical galaxies are more rounded and lack the prominent disk-and-arm structure of Andromeda.

158. The ________ system is the closest star system to our sun.?

• A. Promixa Centauri
• B. Alpha Centauri
• C. Red proxima Centauri
• D. None of these

Explanation: Alpha Centauri is the nearest star system to the Sun; Proxima Centauri is the nearest individual star within that system. The misspelled option refers only to Proxima, not the complete system.

159. How many planets in Solor Syestem?

• A. 4
• B. 5
• C. 6
• D. 8 Chemistry

Explanation: The Solar System has eight recognized planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto is classified as a dwarf planet, not one of the eight planets.

160. Which planet is called "Lopsided planet" ?

• A. Mercury
• B. Venus
• C. Uranus
• D. Saturn

Explanation: Uranus is called the lopsided planet because its axis is tilted about 98 degrees, making it rotate almost on its side. This extreme tilt also produces unusually long seasons.