Advertisement Upgrade to remove ads

The Solar System


When you look at an image of the sun, you are actually looking at the ________________.

Solar wind

The _________is a stream of electrically charged particles that extend outward from the sun's corona.


In a ______________, earth revolves around the sun.

inner planets

All of the _____________ are small and have rocky surfaces.


__________ predicted the existence and orbit of Neqtune based on Neptune's gravitational effect on the orbit of Uranus.


The orbits of most ________ are in the shape of long narrow ellipses.

asteroid belt

The __________ is located between Mars and Jupiter.


___________ usually come from comets or asteroids.


When a meteoroid enter Earth's atmosphere, it produces a streak of light called a __________.

Venus and Earth

________________ are much alike in terms of their size and density.

Saturn's rings

____________ are made up mostly of chunks of ice and rock.


___________ is different from most other planets because it rotates on its side.


____________ is the largest and most massive planet.

Ancient Astronomers

Most _________________ thought that all celestial objects revolved around Earth.

Nuclear fusion

______________ occurs in the core or center of the sun.


_________ was formerly consedered to be a planet but is now classified as a dwarf planet.


A comet's head consists of a nucleus and a fuzzy outer layer called the ______________.


A meteoroid that hits Earth's surface is called a ____________.


The sun's corona, which looks like a ________ can usually be seen only during a solar eclipse.

hydrogen and helium

The gas giants are composed mainly of ______________.

flowing water

Regions on the surface of mars have patterns that appear to have been made by _____________.

geocentric model

An Earth centered model of the universe is called a ____________.

carbon dioxide

Mar's atmosphere is mostly _______________.

great red spot

Jupiter's _____________ is a storm larger than Earth.


The middle layer of the sun's atmosphere is the ___________.

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


Reload the page to try again!


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