Sun the star at the center of our solar system
ball of gases
Изображение: Sun

rotate
spin on an axis
earth rotates or spins on an axis which causes day and night
Изображение: rotate

axis
an imaginary line that passes through the North and South poles
Изображение: axis

revolve
Earth revolves, or travels in a path, around the sun
Изображение: revolve

orbit
to travel in a closed path
the path the Earth takes
Изображение: orbit

Why do day and night happen?
The Earth rotates on its axis.
Изображение: Why do day and night happen?

Why do seasons happen?
Because of Earth's orbit and tilt on Earth's axis.
Изображение: Why do seasons happen?

Earth rotates on its axis every
24 hours
Изображение: Earth rotates on its axis every

Earth revolves around the sun in
1 year
Изображение: Earth revolves around the sun in

a star at the center of our solar system
sun
Изображение: a star at the center of our solar system

shape of Earth's orbit
elliptical or nearly circular
Изображение: shape of Earth's orbit

What part of Earth experiences night a the same time?
about 50%
Изображение: What part of Earth experiences night a the same time?

Why do nighttime stars appear so much smaller than the sun?
The stars are father away.