Comets and Asteroids

All about Comets

- They are made out of dust and ice, kind of like a dirty snow ball.

- Comets come from two places: The Kuiper Belt and the Oort Cloud.

- From far away it looks like a dirty snowball. (dust and rocks.) Close up they look like hazy streaks or faint smudges in the sky.

- Comets have a tail when it reaches the sun causing it to heat up and the solid ( ice ) quickly turns in water vapor, releasing the dust particles. They comets ingredients determines the types and number of tails.

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The Comet above was named Lexell's Comet, or Comet D/1770 L1. It made the closest recorded passage by a comet to our planet of all time, which was passing only 1.4 million miles from earth. It was seen to be 4 times the size of the Moon seen from Earth.

Comet IRAS-Araki-Alcock, viewed in infrared light; NASA Infrared Processing and Analysis Center

The Universe: Comets

The video, "The Universe: Comets" basically described what comets are. It explains how they work, and how they are caused. The video showed pictures to represent a comet before and after it reaches the sun. Then the video went on to tell about asteroids. When talking about asteroids, it told some things that are the same and different between comets and asteroids. One thing that is different is that you can tell which is which, because comets have a tail while asteroids don't. In the end it talks about meteors. Meteors are a small body of matter from outer space that enters earth's atmosphere, becoming incandescent ( emitting light as a result of being heated ) and appearing as a streak of light. Ex: falling stars, shooting stars, and meteoroid. Scientist have discovered that not only is comet dust landing on our planet, but possible comets could be landing on our planet also.

All about Asteroids

- Asteroids are small rocky body orbiting the earth. It comes in large numbers and different sizes. Most are found around Mars and Jupiter. Few pass close to earth or enter earths atmosphere as meteors.

- Asteroids are made of rock and metal. Meteors are seen as streaks of light from earth look like shooting stars. Meteorite are meteors that survived the falling through earth's atmosphere.

- A near-Earth asteroids are asteroids who's orbits are close to Earth's orbit.

- in 1490, about 10,000 people died in the Chinese city Chi ling- yang when an asteroid breaks overhead. The impact it had on the city Chi ling-yang was of course many deaths, but there was no meteorites left so they had no information to figure out where it came from.

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Asteroid 2012 DA14

The asteroid 2012 DA14 zips past our planet on February 15. It is by far the closest flyby on record. DA14 continues to get closer to Earth. Scientist don't think it will have an impact in the future, but NASA is working to make sure satellites are aware of the asteroids passing.

Mountain sized asteroid!

This article is about a mountain sized asteroid heading for earth, that was spotted by Russian scientists. NASA says that it poses no threat for at least 150 years. These mountain sized asteroids happen to pass earth every 3 years. They cause really big explosions. It is said to be 10 times more likely to hit than thought before. Instead of sensors finding nuclear explosions, it's asteroid impacts being found. Nuclear explosion are explosions that occur as a result of a rapid release of energy from a high-speed nuclear reaction. Read to find out more!


- "The Universe: Comets." YouTube. History, 10 Sept. 2010. Web. 09 Dec. 2014.

- Prigg, Mark. "Phew! Mountain Sized Asteroid Heading for Earth Spotted by Russian Scientists Poses No Threat, Nasa Says (for 150 Years, at Least)."Mail Online. Associated Newspapers, 09 Dec. 2014. Web. 10 Dec. 2014.

- "National Geographic Search." National Geographic. Britt Lines, 14 Feb. 2013. Web. 10 Dec. 2014.

- "History of Asteroid Impacts." History of Asteroid Impacts. N.p., n.d. Web. 08 Dec. 2014.