Happens when the Earth spins on its axis

Distance light travels in one earth year

A large sphere of hydrogen gas hot enough for nuclear reactions to occur in its core

Seasons are caused by

When the northern and southern hemispheres get the same amount of sunlight

Occurs when the Earth's axis is neither toward or away from the sun

Earth's tilt does not change as earth orbits the sun, so there are

Shape of the earth's orbit

Sun transfers energy through

When an object completes an orbit around another object one time it is called