Answers I encountered correcting exam papers.What is the main cause of erosion on Moon?Earth's tidal force.Why is Mars red?It is closer to the sun.#1 What causes a star to twinkle?Objects in space such as asteroids passing in front of stars.Why does Triton have a less dense atmosphere than Titan?Because Triton was to not to have an atmosphere.Which nature of light does diffraction demonstrate?The practical nature.What causes a meteor shower?Earth orbiting through the asteroid belt.Why are Mars' seasons more extreme than Earth's?Mars has no living organisms.#2 What causes a star to twinkle?
The vibration of the earth.
#1 How long does it take for the Earth to orbit the Sun?1 monthWhat are two phenomena that occur more frequently during an active Sun?Full moons, stars dying off.
#1 Why does Mars appear fainter than Venus? Venus is brighter than Mars.
What is 'hot Jupiter'?A large star close to Jupiter.
#3 What causes a star to twinkle?Binary stars: when one star passes in front of another.
Why do astronomers think Mercury has a large iron core?Because its moons have iron. #2 How long does it take for the Earth to orbit the Sun?364 days.
#1 What is the main cause of erosion on Mars?Time.
How far across the sky does a star move in two hours?Half-way across the galaxy.
#4 What causes a star to twinkle? Interference of celestial winds.
The Sun's size is not changing. What does this say about the Sun?That the sun is not affected by the atmosphere.
#2 Why does Mars appear fainter than Venus? Venus is on fire.
#3 How long does it take for the Earth to orbit the Sun? Months, not years.
#5 What causes a star to twinkle? Its emission spectrum.
Mention one method that astronomers use to find objects in the celestial sphere.Looking up at the stars... not sure where you're going with this.
#2 What is the main cause of erosion on Mars?Erosion.
#4 How long does it take for the Earth to orbit the Sun?24 hours.
#5 How long does it take for the Earth to orbit the Sun?23 hours, 56 minutes.
#6 What causes a star to twinkle?The hydrogen being converted to helium.
When the dog bites, when the bee stings, when I'm feeling sad, I simply remember these two answers, and then I don't feel so bad:(1)

(2)
The diameter of the Sun is approximately how many times larger than the diameter of Earth? 3 x 108 m/s