Orbit The oval path around which objects in space travel. Ex: The Earth orbits the Sun once every 365 days.
Revolve When an object spins in a circle on a central axis. The Earth revolves counter clockwise once every 24 hours.
Asteroid Rocks, smaller than a planet, which orbit the sun. Made from materials left over from the formation of the solar system. Ex: Asteroid belt. Non luminous
Meteorite Object in space formed from rocks, ice and gasses. Non luminous
Meteor Object in space formed from rocks, ice and gasses. Also known as shooting stars When a particle in space collides with the Earth’s atmosphere. The friction between the particle and the air causes the air to glow. Luminous
A body that creates its own light Stars (Sun) meteor
Non Luminous A body that is illuminated because it is reflecting the light of something luminous Planets Moon Asteroid Meteorite
How constellations are named When humans first looked at the sky, they saw hundreds of twinkling dots of light. They connected the dots to make pictures of people, animals and other things. The pictures helped them, and now us, remember the stars. There are 88 constellations recognized by the International Astronomical Union.
A Few Important Things to Know Asterism- unofficial star group. Usually make up part of a larger constellation. Ex: The Big Dipper
Hemispheres The earth is divided into 2 hemispheres. The North and South. It is divided by the equator. If you live in the northern hemisphere, you mainly see northern stars, if you live in the southern hemisphere, you mainly see southern stars.