Astronomy Flashcard: Sun, Earth and Moon

Front

What is the Sun?

Back

The Sun is the closest star to Earth and is a huge ball of hot gases.

Front

How long does it take for Earth to orbit the Sun?

Back

It takes Earth about 365 1/4 days to orbit the Sun once.

Front

What shape is the Earth's orbit around the Sun?

Back

The Earth's orbit is elliptical, meaning it is oval-shaped.

Front

What does 'axis' mean in relation to Earth?

Back

The axis is an imaginary line that goes through the center of the Earth from the North Pole to the South Pole.

Front

How long does it take for Earth to rotate once on its axis?

Back

It takes Earth 24 hours to complete one rotation.

Front

What is the main source of light and heat for Earth?

Back

The Sun is the main source of light and heat for Earth.

Front

What is the difference between rotation and revolution?

Back

Rotation is when Earth spins on its axis, while revolution is when Earth orbits around the Sun.

Front

What causes day and night on Earth?

Back

Day and night are caused by the rotation of Earth on its axis.

Front

What is a planet?

Back

A planet is a large celestial body that orbits a star, like Earth orbits the Sun.

Front

What is the Moon?

Back

The Moon is a natural satellite that orbits Earth.