IGCSE Astronomy

Created by MrsPalmer 

Upgrade to
remove ads

20 terms

Earth

the 3rd planet from the sun

moon

any natural satellite of a planet

Moon

the natural satellite of the Earth

gravity

(physics) the force of attraction between all masses in the universe

satellite

any celestial body orbiting around a planet or star

artificial satellite

man-made equipment that orbits around the earth or the moon

geostationary

Take 24 hours to revolve around Earth and always above same point on Earth's surface - most communication satellites are in this orbit

polar orbit

orbit that allows a satellite to travel around the earth, from pole to pole, in a short time to provide broad photo coverage of the planet

low earth orbit

an orbit located a few hundred kilometers above the earth's surface

orbital period

the time required for a body to complete a single orbit

orbital radius

distance from a satellite to the center of the object it is orbiting

orbital speed

the speed at which a planet is traveling in its orbit

comet

a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit

Solar System

sun, planets, and all the other objects that revolve around the sun

Milky Way

the name of our galaxy, a spiral galaxy that contains about 400 billion stars

galaxy

a collection of star systems

star

a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interior

elliptical

oval

gravitational force

the force of attraction between all masses in the universe

universe

everything that exists, including the sun, stars, all the planets, and outer space

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set