Space and Astronomy— Concepts, Formulas & Shortcuts
- Planetary order from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
- Jupiter is the largest planet; Mercury the smallest and closest to the Sun.
- Venus is the hottest planet due to its dense carbon-dioxide atmosphere.
- Light from the Sun takes about 8 minutes 20 seconds to reach the Earth.
- ISRO was formed in 1969; Aryabhata, India's first satellite, launched in 1975.
- Chandrayaan missions target the Moon; Mangalyaan targeted Mars in 2013.
Space and Astronomy Practice Questions with Answers
Attempt each question first, then open the explanation. All 10 questions below are free to read and require no signup.
Q1.Which is the hottest planet in the solar system?
Moderate- AMercury
- BVenus
- CMars
- DJupiter
Space and Astronomy question 1 of 10+Show Answer & Explanation
Answer: B. Venus
Explanation: Venus's dense carbon-dioxide atmosphere traps heat, making it hotter than Mercury.
Q2.How many planets are there in the solar system?
Easy- ASeven
- BEight
- CNine
- DTen
Space and Astronomy question 2 of 10+Show Answer & Explanation
Answer: B. Eight
Explanation: Eight, since Pluto was reclassified as a dwarf planet in 2006.
Q3.Which planet is known as the Red Planet?
Easy- AVenus
- BMars
- CJupiter
- DMercury
Space and Astronomy question 3 of 10+Show Answer & Explanation
Answer: B. Mars
Explanation: Iron oxide on its surface gives Mars a reddish appearance.
Q4.Light from the Sun takes approximately how long to reach the Earth?
Moderate- A8 seconds
- B8 minutes
- C8 hours
- D8 days
Space and Astronomy question 4 of 10+Show Answer & Explanation
Answer: B. 8 minutes
Explanation: At 150 million km and 3 × 10⁸ m/s, sunlight takes about 8 minutes 20 seconds.
Q5.ISRO was established in:
Moderate- A1962
- B1969
- C1975
- D1980
Space and Astronomy question 5 of 10+Show Answer & Explanation
Answer: B. 1969
Explanation: The Indian Space Research Organisation was formed in 1969.
Q6.India's first satellite was named:
Moderate- ABhaskara
- BAryabhata
- CRohini
- DINSAT
Space and Astronomy question 6 of 10+Show Answer & Explanation
Answer: B. Aryabhata
Explanation: Aryabhata was launched in 1975 and named after the ancient Indian astronomer.
Q7.Which planet has the most prominent ring system?
Easy- AJupiter
- BSaturn
- CUranus
- DNeptune
Space and Astronomy question 7 of 10+Show Answer & Explanation
Answer: B. Saturn
Explanation: Saturn's rings are by far the brightest and most extensive.
Q8.The Chandrayaan missions are directed towards:
Easy- AMars
- BThe Moon
- CVenus
- DThe Sun
Space and Astronomy question 8 of 10+Show Answer & Explanation
Answer: B. The Moon
Explanation: Chandrayaan is India's lunar exploration programme.
Q9.Which is the smallest planet in the solar system?
Moderate- AMercury
- BMars
- CVenus
- DEarth
Space and Astronomy question 9 of 10+Show Answer & Explanation
Answer: A. Mercury
Explanation: Mercury is both the smallest planet and the closest to the Sun.
Q10.A solar eclipse occurs when:
Moderate- AThe Earth comes between the Sun and Moon
- BThe Moon comes between the Sun and Earth
- CThe Sun comes between the Earth and Moon
- DThe Earth's shadow falls on the Sun
Space and Astronomy question 10 of 10+Show Answer & Explanation
Answer: B. The Moon comes between the Sun and Earth
Explanation: The Moon passes between the Sun and Earth, blocking sunlight from part of the Earth's surface.
Space and Astronomy — Frequently Asked Questions
Why is Venus hotter than Mercury despite being farther from the Sun?+
Venus has a thick carbon-dioxide atmosphere that traps heat through a runaway greenhouse effect, while Mercury has almost no atmosphere to retain warmth.
What was India's first satellite?+
Aryabhata, launched in 1975 with Soviet assistance and named after the classical Indian astronomer and mathematician.
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