1. 2/26/18 - POD POD #1 - Write 2-3 adjectives for each: Asteroid:
FIRST, (BEFORE YOU DO ANYTHING) submit last
week’s PODs to your period’s BLACK TRAY. Then,
start a new page for this week’s PODs.
POD #1 - Write 2-3 adjectives for each:
Asteroid:
Meteor:
Meteorite:
Comet:

2. Comets Part 2 Notes 2/26/18
Key Points: 1. Parts of a Comet 2. Halley’s Comet 3. Shoemaker-Levy 9 Comet

3. 1. Parts of a Comet
A. Nucleus - solid center of the comet made of mostly ice and gas with a
small amount of dust
B. Coma - dense cloud of water and gases (mainly carbon dioxide)
that surrounds the nucleus
C. Hydrogen envelope - cloud of hydrogen that surrounds the coma

4. 1. Parts of a Comet
D. Dust tail: *Up to 10 million km long *Made of small dust particles that have evaporated from the nucleus *The most visible part of a comet

5. GETS FAR FROM THE SUN<<<
1. Parts of a Comet
E. Ion tail:
*Narrow and blueish
*Made of glowing charged gases
*Solar winds blow the ion tail away from the sun.
>>>THE TAIL GETS BIGGER AS IT GETS CLOSER TO THE SUN AND SMALLER WHEN IT
GETS FAR FROM THE SUN<<<

7. Dust

10. Stardust
In the early 1990s, NASA established a program called Discovery to competitively select proposals for low-cost solar system exploration missions with highly focused science goals. Stardust, the fourth Discovery mission, sent a spacecraft to fly through the cloud of dust that surrounds the nucleus of a comet. For the first time ever, the mission brought cometary material back to Earth. Stardust was the first U.S. mission dedicated solely to a comet and was the first to return extraterrestrial material from outside the orbit of the moon. Stardust's main objective was to capture a sample from a well-preserved comet called Wild-2 (pronounced "Vilt-2"). Launched February 7, 1999, from Cape Canaveral, Florida, on a Delta II rocket, Stardust collected interstellar dust as it flew through the solar system in spring On January 15, 2001, the spacecraft executed a flyby of Earth. In summer and fall 2002, the spacecraft again collected interstellar dust.

11. 2. Halley’s Comet
A. The most famous comet that is visible from Earth every 75 years B. Edmond Halley first discovered the comet’s repeated orbit C. Next appearance will be in 2061 (Last seen in 1986)

12. The comet's tail gets bigger as it gets closer to the sun and then decreases as it moves away from the sun.

13. Shoemaker-Levy 9 crashes into Jupiter (Video)
3. Shoemaker-Levy 9 Comet
A. Discovered by Carolyn and Eugene Shoemaker and David Levy
B. In 1994, comet Shoemaker-Levy 9 crashed into Jupiter.
Shoemaker-Levy 9 crashes into Jupiter (Video)