Science Form 3 Chapter 12

What is used to measure the relative distances between the planets and the Sun?

• Astronomical unit and light years

• Kilograms and meters

• Seconds and minutes

• Celsius and Fahrenheit

What does 1 Astronomical Unit (A.U) equal in kilometers?

• 1.5 x 10^8 km

• 9.5 x 10^12 km

• 1.5 x 10^12 km

• 9.5 x 10^8 km

How many kilometers are in 1 light year?

• 9.5 x 10^12 km

• 1.5 x 10^8 km

• 1.5 x 10^12 km

• 9.5 x 10^8 km

Why are astronomical units and light years used in the Solar System?

• Because the distances between the planets and the Sun are very great

• Because the planets are very small

• Because the Sun is very hot

• Because the planets are made of gas

What is a planet?

• A large round object in space that orbits around a star.

• A small star that shines brightly.

• A comet that passes by Earth.

• A rock floating in space.

How many planets are there in the solar system?

• Eight

• Five

• Ten

• Twelve

Which planet is the closest to the Sun?

• Mercury

• Venus

• Earth

• Mars

What is the smallest planet in the solar system?

• Mercury

• Jupiter

• Saturn

• Neptune

The surface of Mercury is similar to the surface of which celestial body?

• The Moon

• Mars

• Earth

• Venus

Why does the sky appear dark in outer space on Mercury?

• Because there is no atmosphere to scatter light

• Because Mercury is far from the Sun

• Because Mercury has thick clouds

• Because Mercury is covered in water