astronomy 1

The Earth's motion around the Sun is called its

• rotation
• revolution
• precession
• nutation

The Sun is

• smaller than the Earth
• about the same size as the Earth
• four or five times as big as the Earth
• amillion times as big as than the Earth

Which is the correct hierarchy of the Earth in the universe from SMALLEST TO LARGEST?

• Milky Way Galaxy, Earth, solar system, universe
• Earth, solar system, universe, Milky Way Galaxy
• Earth, solar system, Milky Way Galaxy, universe
• universe, Milky Way Galaxy, solar system, Earth

What force keeps Earth in its orbit around the Sun?

• atomic fusion
• gravity
• solar flares
• rotation

The force of attraction between objects that have mass.

• Force
• Gravity
• Weight
• Density

What is the name of our Galaxy

• Andromeda
• Dwarf Galaxy
• Milky Way
• None of the above

How old is our universe according to the Big Bang Theory?

• We don't know
• 15 billion years
• 13.7 billion years
• 11 billion years

What is the thing that makes the planets orbit

• Jupiter
• Neptune
• Sun
• moon

Based on the red shifts of distant galaxies, astronomers conclude that

• the universe is contracting.

• the universe is expanding.

• Earth is at the center of the universe.

• new galaxies are always forming.

The Milky Way is

• a spiral galaxy

• an elliptical galaxy

• an irregular galaxy