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Asteroids, Comets, Meteors

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Asteroids, Comets, Meteors Fireball in Mexico Meteors Meteors Meteor Crater 4000 feet Meteors Meteor Crater The Holsinger Meteorite, largest fragment of the meteor ... – PowerPoint PPT presentation

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Title: Asteroids, Comets, Meteors


1
Asteroids, Comets, Meteors
2
Asteroids
3
Asteroids
Asteroid Itokawa
4
Asteroids
36 miles
Ida and Dactyl
5
Asteroids
How often does an asteroid whiz by the Earth? The
above time-lapse animation follows the orbit of
the Earth around the Sun for two months in 2002
as numerous asteroids, also known as minor
planets, approach and pass by. Some asteroids
appear out of nowhere as they are plotted only
when they were discovered. Most asteroids plotted
were discovered only during the previous year.
The only objects displayed are those visible from
Earth closer than 20 million kilometers. One
significant research area in modern astronomy
involves trying to find the majority of asteroids
that could pose a future collision threat with
Earth.
6
Asteroids
NASA's Near Earth Object Program
7
Asteroids
Dr. Tyson
8
Asteroids
9
Asteroids
  • Small (school sized to 600 miles) rocks that
    orbit the Sun, generally, between Mars and
    Jupiter.
  • Some asteroids may cross the orbit of Earth.

10
Comets
11
Comets
12
Comets
13
Comets
14
Comets
15
Comets
Stardust
Launched February 1999 Encountered Comet Wild 2
January 2nd 2004 Returned to Earth January
2006
16
Comets
COMET WILD 2
Stardust
Closest Encounter was at 149 miles
Photo is from 311 miles
17
Comets
18
Comets
Dust Collector with Aerogel
19
Comets
Aerogel
20
Comets
Aerogel
21
Comets
Dust Collector with Aerogel
22
Comets
23
Meteors
24
Meteors
Perseid Meteor Shower
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Meteors
26
Meteors
27
Meteors
Meteor Shower Date Length Constellation Number per Hour
Delta Aquarids July 29 20 Days Aquarius 35
Perseids August 11-12 5 Days Perseus 50-60
Draconids October 10 1 Day Draco Variable
Orionids October 20 8 Days Orion 25-30
Taurids November 5 30 Days Taurus 12
Cepheids November 9 4 Days Cepheus 8
Leonids November 17 4 Days Leo 10-100
Andromedids November 20 20 Days Andromeda Variable
Geminids December 14 8 Days Gemini 58
Ursids December 22 7 Days Ursa Minor 6-10
28
Meteors
The Peekskill meteor of 1992 was captured on 16
independent videos and then struck a car.
Documented as brighter than the full Moon, the
spectacular fireball crossed parts of several US
states during its 40 seconds of glory before
landing in Peekskill, New York. The resulting
meteorite, pictured here, is composed of dense
rock and has the size and mass of an extremely
heavy bowling ball. If you are lucky enough to
find a meteorite just after impact, do not pick
it up -- parts of it are likely to be either very
hot or very cold.
29
Meteors
30
Meteors
31
Meteors
32
Meteors
METEOROID METEOR METEORITE
A chunk of space stuff. A meteoroid that has entered the Earths atmosphere. A meteor that has hit the Earths surface.
33
Meteors
Fireball
34
Meteors
Fireball in Mexico
35
Meteors
4000 feet
Meteor Crater
36
Meteors
Meteor Crater
37
Meteors
The Holsinger Meteorite, largest fragment of the
meteor that crated Meteor Crater.
38
Meteor Crater, Arizona
39
Meteors
The Willamette Meteorite is a rare and important
scientific specimen that is preserved as part of
the collections of the Museum's Department of
Earth and Planetary Sciences. It was found in the
Willamette Valley of Oregon and acquired by the
Museum in 1906. In structure it is a metallic
iron meteorite, weighing over 15.5 tons, the
largest meteorite ever found in the United
States, and the sixth largest meteorite in the
world. Metallic iron meteorites are a relatively
rare kind of meteorite. They comprise a class of
about 600 out of a total of 25,000 meteorites so
far found on the Earth's surface.
40
Meteors
ebay meteorites
41
  • Asteroids
  • Rocky objects that generally orbit between Mars
    and Jupiter.
  • Average ½ mile in size.
  • Some cross the Earths orbit.
  • Comets
  • Icy Objects that orbit with highly eccentric
    orbits
  • Average a few miles in size.
  • Have tails when near the Sun.
  • 65 million years ago killed the dinos?
  • Meteors
  • Shooting Stars
  • Comets leave behind a trail of raisin size debris
    and the Earth travels through.
  • Most meteoroids burn up in the atmosphere.
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