This study set covers Astronomy through 11 practice questions. Overview of the solar system's formation, planets, moons, stars, and related phenomena like moon phases and telescopes. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

Questions & Answers

Browse all 11 questions from the Solar System and Celestial Objects study set below. Each question shows the correct answer — select a study format above to practice interactively.

1 What is the approximate age of our solar system?

A 5 billion years
B 1 billion years
C 10 billion years
D 5 million years

2 What primarily caused the lighter elements to be blown away from planets close to the Sun?

A Gravity
B Radiation from the Sun
C Volcanic activity
D Asteroid impacts

3 Which of these planets have deep atmospheres of gas or frozen solid layers?

A Mercury, Venus, Earth, Mars
B Jupiter, Saturn, Uranus, Neptune
C Earth, Venus, Jupiter, Saturn
D Mars, Neptune, Mercury, Uranus

4 What powers stars?

A Chemical reactions
B Nuclear fusion
C Radio waves
D Electromagnetism

5 Approximately how long does it take for the moon to orbit the Earth?

A 28 days
B 365 days
C 7 days
D 14 days

6 What causes the phases of the moon?

A Earth's shadow
B The sun lighting different parts of the moon
C Volcanic eruptions on the moon
D Changes in the moon's shape

7 What happens when chunks of rock from space meet Earth's atmosphere?

A They become new moons
B They glow and disintegrate
C They create new planets
D They cause earthquakes

8 Why do comets have tails?

A Due to their high speed
B Radiation boils off frozen materials
C Due to their magnetic field
D Because they are burning

9 What is needed to "see" something?

A Sound waves
B Light waves entering the eye
C Feeling it
D Smelling it

10 What produces the night-and-day cycle on Earth?

A The Earth's orbit around the sun
B The Earth's rotation on its axis
C The moon's orbit around the Earth
D Solar flares

11 What do telescopes allow us to see?

A Fewer stars
B More distant objects in the sky
C Only the planets
D Only the moon

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