Comets, Asteroids, and Meteors
This presentation is the property of its rightful owner.
Sponsored Links
1 / 30

Comets, Asteroids, and Meteors PowerPoint PPT Presentation


  • 70 Views
  • Uploaded on
  • Presentation posted in: General

Comets, Asteroids, and Meteors. What  is a comet?. A comet is a small body which scientists sometimes call a planetesimal. They are made out of dust, rock, gas, and ____. They are kind of like a dirty _________. ice. snowball. Comets are made up of different parts. The nucleus

Download Presentation

Comets, Asteroids, and Meteors

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Comets asteroids and meteors

Comets, Asteroids, and Meteors


Comets asteroids and meteors

What  is a comet?

A comet is a small body which scientists sometimes call a planetesimal. They are made out of dust, rock, gas, and ____. They are kind of like a dirty _________.

ice

snowball


Comets asteroids and meteors

  • Comets are made up of different parts.

  • The nucleus

  • The coma

  • The ion tail

  • The dust tail

  • The hydrogen envelope


Comets asteroids and meteors

The nucleus is the frozen _______ of a comet’s head. It is composed of ____, ____, and dust. The nucleus contains most of the comet’s mass and measure about 10 miles across or less.

center

ice

gas


Comets asteroids and meteors

The nucleus of Halley’s Comet


Comets asteroids and meteors

coma

The ______ is a spherical blob of gas that __________ the nucleus of a comet. As the comet gets closer to the sun, the heat __________ some of the ice and causes the comet to spew gas and dust particles into space.

surrounds

vaporizes

nucleus

The_________and the _______ form the head of a comet.

coma


Comets asteroids and meteors

ion tail

The _________ is made of ___________ charged gas molecules that are being pushed away from the nucleus by the solar _____. (The blue tail in the picture.)

electrically

wind


Comets asteroids and meteors

  • When a comet is approaching the Sun, the ion tail _______ the comet: when the comet is leaving of the Sun, the ion tail _____. The tail fades as the comet moves far from the Sun.

trails

leads

  • The ion tail can be well over 100 million km long.


Comets asteroids and meteors

The _________ develops when the comet is _____ the Sun. This tail is made of small dust particles that have evaporated from the nucleus and are being pushed away from the comet. The tail _______ slightly due to the comet’s motion.

dust tail

near

curves


Comets asteroids and meteors

  • The tail can be up to 250 million km long, and is most of what we see. Comets are only visible when they're _____ the sun in their elliptical orbits.

near

Comet Hale Bopp showing its two tails.

Courtesy of NASA


Comets asteroids and meteors

http://www.astrographia.com/images/9.jpg


Comets asteroids and meteors

Hale-Bopp – The Great Comet of 1997


Comets asteroids and meteors

Surrounding the coma is an invisible layer of __________ that has been released. It is the ___________________ . This cannot be seen from Earth because its light is absorbed by our atmosphere. It is usually between the ion tail and the dust tail.

hydrogen

hydrogen envelope


Comets asteroids and meteors

Can you identify the following parts of a comet?

4.

Hydrogen envelope

1.

Ion tail

2.

Nucleus

3.

5.

Coma

Dust cloud


Comets asteroids and meteors

elliptical

Comets orbit the Sun in highly _________ orbits. Their speed _________ greatly when they are near the Sun and ______ down at the far reaches of the orbit. Since the comet is light only when it is near the Sun, comets are dark throughout most of their orbit.

increases

slows


Comets asteroids and meteors

Comets originate from either the _______ _____ (beyond the orbit of Neptune) or the ___________ (which surrounds the outer reaches of the solar system.)

Kuiper

  • Belt

Oort Cloud


Comets asteroids and meteors

Videos on Comets

http://videos.howstuffworks.com/hsw/5354-the-small-pieces-comets-video.htm

http://www.brainpop.com/science/space/comets/

Animation of a Comet

http://www.kidsastronomy.com/comets.htm


Comets asteroids and meteors

ASTEROIDSAsteroids are _______ or _________ objects, also know as____________ or minor planets that revolve around our Sun.

rocky

metallic

planetoids


Comets asteroids and meteors

Most asteroids orbit the Sun in the asteroid belt located between _______ and _________. A few asteroids approach the Sun more closely. The asteroids in the asteroid belt have a slightly __________ orbit.

Mars

Jupiter

elliptical

  • The time for one revolution around the Sun varies from about _________ Earth years

3 to 6


Comets asteroids and meteors

Asteroids range in size from tiny pebbles to about 578 miles (930 kilometers) in diameter.

  • Sixteen of the 3,000 known asteroids are over 150 miles (240 km) in diameter.


Comets asteroids and meteors

  • Asteroid Ceres

  • Diameter of 590miles (950 km)

  • Largest asteroid and only dwarf planet in the inner Solar System

  • Asteroid Vesta

  • Diameter of 326 miles (525 km)

  • Brightest asteroid visible from the Earth.


Comets asteroids and meteors

Some asteroids even have orbiting ______. Here is the asteroid “243 Ida” and its tiny asteroid moon, Dactyl. This is the first asteroid ever found with an orbiting moon. Ida's dimensions are about 35 x 15 x 13 miles. Dactyl is only about 1 mile across.

moons


Comets asteroids and meteors

METEOROIDS, METEORS, and METEORITES

Meteoroids are ______ bodies that travel through space. Most meteoroids are smaller than the size of a ________. Meteoroids are tiny particles left by an asteroid or a comet.

small

pebble


Comets asteroids and meteors

A meteor is a meteoroid that has entered the _____________________, usually making a fiery trail as it falls. It is sometimes called a _________ star or a _______ star.

Earth’s atmosphere

shooting

falling


Comets asteroids and meteors

A meteor shower is a phenomenon in which ______ meteors fall through the atmosphere in a relatively ______ time and in approximately parallel trajectories.

many

short

Arizona, November 1966 - The Leonid meteor shower rained 2,300 meteors per minute for 20 minutes. (Photo NASA)


Comets asteroids and meteors

Video of meteor Shower

  • http://www.metacafe.com/watch/903546/time_lapse_of_the_perseid_meteor_shower_geminid/


Comets asteroids and meteors

A meteorite is a meteor that has fallen and ______ the Earth. These rare objects have survived a fiery fall through the Earth's atmosphere and have lost a lot of mass during that process.

struck


Comets asteroids and meteors

Near Winslow, Arizona, you can visit a crater that was made from a meteorite. The crater is nearly one mile across, 2.4 miles in circumference, and more than 500 feet deep.

Animation on the formation of this crater. http://www.meteorcrater.com/


Comets asteroids and meteors

RESOURCES

http://www.kidsastronomy.com/images/comet2.gif

http://www.kidsastronomy.com/comets.htm

http://www.nasa.gov/worldbook/comet_worldbook.html

http://www.explanet.info/Chapter14.htm

http://ed101.bu.edu/StudentDoc/Archives/spring05/aprylh/Lesson1.html

http://spaceinimages.esa.int/Images/2002/11/The_nucleus_of_Comet_Halley

http://studentastronomyblog1.blogspot.com/2013/02/dirty-snowballs-comets.html

http://science.howstuffworks.com/dictionary/astronomy-terms/comet3.htm

http://spaceplace.nasa.gov/tails-of-wonder/

http://www.thegalaxyguide.com/galaxy/comets/

http://spaceguard.rm.iasf.cnr.it/NScience/neo/neo-what/com-tail.htm

http://www.astropix.com/HTML/SHOWCASE/970401.HTM

http://www.solarviews.com/eng/comet.htm

http://blogs.saschina.org/julia01pd2014/2010/03/10/lab-answers/

http://www.enchantedlearning.com/subjects/astronomy/activities/label/comet/

http://cse.ssl.berkeley.edu/segwayed/lessons/cometstale/frame_orbits.html

http://abyss.uoregon.edu/~js/images/migrate3.gif

http://csep10.phys.utk.edu/astr161/lect/asteroids/features.html

http://en.wikibooks.org/w/index.php?title=File:Asteroid_belt_between_Mars_%26_Jupiter.PNG&filetimestamp=20050718221323&


Comets asteroids and meteors

http://www.sen.com/feature/space-rocks-comets-asteroids-meteorites-and-more.html

http://dustyloft.files.wordpress.com/2008/09/asteroids_comets_sc_0-000-075.png

http://en.wikipedia.org/wiki/Ceres_(dwarf_planet)

http://en.wikipedia.org/wiki/File:Meteoroid_meteor_meteorite.gif

http://rense.com/general42/ukteen.htm

http://weblogs.marylandweather.com/2010/01/twilight_meteor_reported_monda.html

http://science.howstuffworks.com/dictionary/astronomy-terms/leonid2.htm

http://www.meteorcrater.com/


  • Login