Too much outdoor light at night _ light pollution.
City lights _ a glow that blocks stars from view.
A planet _ its position constantly.
The stars _ slowly over billions of years.
The moon _ around the Earth.
The planets _ around the sun.
Jupiter _ around every ten hours.
The planets _ around on their axes.
It _ a year for the Earth to complete an orbit.
Stars _ billions of years to burn out.
The sun _ light to the planets.
The stars _ light to the planets.
Mars _ greatly from Jupiter in size.
The planets _ from one another in size.
A telescope _ us see the planets.
Telescopes _ us see the stars.
An astronomer _ the stars.
Astronomers _ the stars.
He _ that stars are made of gases.
Scientists _ that the Earth is round.
A rocket _ into space.
Rockets _ into space.
Saturn _ like a big ball with rings.
The planets _ like stars in the night sky.
The largest moon crater _ a huge area.
Craters _ much of the moon.
The Alpha star _ the brightest.
The stars _ brightly in the night sky.
The Earth _ warmth from the sun.
Comets _ warmer as they get close to the sun.
A meteor _ up as it drops towards Earth.
As meteors _ they create a streak of light.
A comet _ across the sky.
Comets _ across the sky.
A total eclipse of the sun _ rarely.
Lunar eclipses _ often.
The moon _ around the Earth.
Planets _ around the sun.
She _ a shooting star.
They _ a comet.
Carl _ a comet.
I _ a comet.
He _ to the group to look up.
The children _ when they see the meteor.
He _ all the constellations.
Astronomers _ a lot about the stars.
He _ through the telescope.
I _ through the telescope.
Brian _ to see the eclipse.
You _ to see an eclipse.
The boy _ Venus in the sky.
I _ Venus in the sky.
Noah _ until it gets dark.
You _ until it gets dark.