Astronomy Vocabulary

Astroid
Astroid
Large and small rock like objects that orbit mainly in a belt between Mars and Jupiter.
Astronomy
The scientific study of matter in outer space
Axis
Axis
An imaginary line that runs from the north pole to the south pole. Earth is tilted on its axis 23.5 degrees.
Comet
objects made up of gas, ice and dust, as they approach the sun it melts forming a “tail”.
Eclipse
Eclipse
The blocking out of one object in space by another (sun, moon).
Fossil fuel
Fossil fuel
Stored energy from the sun found in fossils of ancient plants and animals (example coal and oil).
Galaxy
Galaxy
Massive amount of millions of stars all orbiting a common center
Mass
Mass
The amount of matter in something.
Meteors
Meteors
A small solid body entering a planets atmosphere.
Moon
Moon
Natural satellite of Earth visible only by reflecting sunlight.
Orbit
Orbit
The path of one object as it goes around another object.
Photosynthesis
The process of plants making food by using energy from the sun.
Planet
Planet
A body that orbits the sun, has its own gravity that has made it round, and has cleared smaller objects out of its part of space.
Sun
Sun
The star that is the center of our solar system. Provides energy in the form of heat and light.
Revolution
Revolution
Earth’s movement around the sun. It takes 365 days, or 12 months, or 52 weeks.
Rotation
Rotation
A turning motion on an axis. Earth’s rotation gives us day and night. It takes 24 hours for earth to rotate once.
Seasons
Seasons
Natural division of the year in terms of weather conditions caused by the Earth going around the sun on its axis.
Tides
Tides
The rising and falling of Earth’s water because of the gravity of the moon and sun.
Phases
Phases
The moon as it appears at a particular time in its cycle. Takes 29.5 days to complete one lunar cycle around the Earth
Gravity
Gravity
Natural force of attraction between all objects in the universe. The larger the mass the larger the attraction
Earth
Earth
Third planet from the sun. Only known planet to support life with water and a breathable atmosphere.
Shadows
Shadows
The rough image cast by an object by blocking light.
Solar System
A system of planets and other bodies orbiting a star.
Telescope
Telescope
Tool used to see object close up from far away.