A person who travels in space.

Frozen balls of ice, gas and rock

orbiting the sun. Usually are

irregular shapes. Also known as minor planets.

A scientist who studies space.

The study of space.

The gravity of a massive star or group of stars

causes it to suck in on itself. This

makes it so dense that not even light

can escape its gravitational field.

A big chunk of rock, metal, and

ice that orbits the sun. Has a tail of dust and gases called a coma.

Bunches of stars in the sky that look

like pictures.

Examples: Orion, Big Dipper, and

Pegasus.

Immense systems containing billions of stars. Come in different shapes: spiral, elliptical,

oval-shaped, and some are irregular. The universe may

have 40 to 50 billion of them.

Fragments of comets, planets,

moon, or asteroids that have broken off. Billions enter

Earth’s atmosphere every

day, but most disintegrate before reaching Earth.

Meteors that fall to Earth.

Our own spiral-shaped

galaxy. Contains about 200 billion

stars.

A natural satellite that goes around a

planet.

To travel around a body on a path in

space. For example: Earth

______s

the sun.

A place equipped to observe space.

A body in orbit around the sun.

There are nine in our solar system.

A body in orbit around a planet. Our moon is an

example but some are also made by

humans.

The sun, the nine planets that orbit it and the many

satellites, asteroids and

meteorites that are controlled by

the suns gravitational pull.

Huge balls of hot gases. There are

billions in the universe.

The closest star to the earth. The

center of our solar system. Gives us

heat in light.

An optical instrument used to

view far away objects, such as

planets and stars.