By David Mills

What is a comet?

A comet is an icy solar system body that when it passes close to the sun, begins to heat up and emit gasses.

When, where and how comets form?

Comets are formed in space and are the leftover materials from the formation of the planets. These materials include gases, ice, rocks and dust particles.

Comets orbit vs planets orbits

A comet has a very stretched out orbit that is shaped more like an oval while the planets have a more circular orbit.

Comets shape

Comets are usually rougher around the edges and don't have an ion tail while when comets are close to the planets and Sun, they get smoother and are shaped more round. Also they obtain ion tails because of solar winds and the Suns heat.

Ion tails

When comets get closer to the Sun, the Suns particles convert some of the comets gases into ions forming an ion tail.

Comet Lovejoy

Comet Lovejoy is a comet that was discovered by Terry Lovejoy in 2011. This photograph was taken by an astronaut aboard the ISS.
Big image


An asteroid is a small rocky body orbiting the sun.

Asteroids vs meteors vs meteorites

Asteroids - small rocky body orbiting the Sun

Meteors - is the flash of light that we see in the sky when a small chunk of debris from space burns up as it passes through Earth's atmosphere.

Meteorites - a meteor that survives its passage through the earth's atmosphere and hits the ground


NEOs are asteroids that have been nudged by the gravitational attraction of nearby planets into orbits that allow them to enter the Earth's atmosphere.

Vredefort Crater

The Vredefort crater is the largest verified crater on Earth, more than 300 km across when it was formed. It is located in South Africa. The impact of the asteroid happened around 2 billion years ago.
Big image


Ceres is the largest asteroid in the asteroid belt and lies between the orbits of Mars and Jupiter. It is mostly rock and ice and is 590 miles in diameter. This picture was taken through the Hubble Space Telescope.

News article paragraph

Ceres is the largest asteroid in our solar system and scientists have recently detected water on the asteroid. NASA Science news is the publisher of the article. One word that people might not understand is cosmic. Cosmic means

of or relating to the universe or cosmos, especially as distinct from the earth. 2 key facts that readers will want to get out of this is the amount of freshwater that is on Ceres and that Ceres is the largest asteroid in our solar system.

News article on Ceres from NASA Science News

For the last century, Ceres was known as the largest asteroid in our solar system. It is roughly 590 miles in diameter. When it first was spotted in 1801, astronomers thought it was a planet orbiting between Mars and Jupiter. Later, other cosmic bodies with similar orbits were found, marking the discovery of our solar system's main belt of asteroids.

Scientists believe Ceres contains rock in its interior with a thick mantle of ice that, if melted, would amount to more fresh water than is present on all of Earth. The materials making up Ceres likely date from the first few million years of our solar system's existence and accumulated before the planets formed.


"Ceres." Los Angeles Times. Los Angeles Times, n.d. Web. 09 Dec. 2014.

"Comets: Formation, Discovery, Exploration." N.p., n.d. Web.

"Science@NASA Headline News - NASA Science." Science@NASA Headline News - NASA Science. N.p., n.d. Web. 09 Dec. 2014.

"The Universe: Comets." YouTube. N.p., n.d. Web. 09 Dec. 2014

Comet Video

This video talks about the orbits of comets. Also it talks about what a comet is and what it's made of. Also the video compares comets to asteroids. This video is by the History channel.