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Asteroids and Comets

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(plus Titan from Cassini-Huygens and pictures from Deep Impact) ... Multiple nuclei of comet Shoemaker-Levy 9 on a collision course with Jupiter (HST picture) ... – PowerPoint PPT presentation

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Title: Asteroids and Comets


1
Asteroids and Comets
  • Debris of the solar system
  • (plus Titan from Cassini-Huygens and pictures
    from Deep Impact)

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Mars an active surface, which has erased many
old impact craters
Impact craters
Volcano
Rift valley
6
Europa a very young, icy surface which has
erased (almost) all impact craters
7
Ganymede evidence for recent impacts
Jupiters satellite Ganymede is peppered with
bright splashes, where impacts have revealed the
clean, icy surface beneath. The surface tarnishes
with time, partly as a result of the solar wind,
so the impacts must be recent.
8
Some of the culprits a selection of small
asteroids
Note the irregular shape and the fact that they
are themselves covered in small craters.
Impactors come in all sizes.
9
Various views of asteroid Ida
10
Asteroid Mathilde, from NEAR evidence of
fragmentation?
11
Montage of views of Eros as NEAR probe approached
it
12
Close-ups of Eros from various angles
13
Close-ups of the surface of Eros
14
NEAR starts its descent to the surface of Eros
15
NEAR approaches the surface of Eros
16
Contact! in the middle of reading out a frame
17
Callisto evidence for a LARGE impact! Note the
circular shock rings around the impact point.
18
Montage of images of Comet Borelly, taken by the
space probe Deep Space 1 in September 2001
19
Comet Halley nucleus from Giotto spacecraft
Multiple nuclei of comet Shoemaker-Levy 9 on a
collision course with Jupiter (HST picture)
20
Close-up view soon after first impact
21
Montage of infrared pictures of Jupiter after SL9
impact the effects can still be seen two months
later
22
On a smaller scale the effect of impacts of
very small particles aurorae on Jupiter caused
by charged particles from the solar wind or from
Io leaking into the upper atmosphere
23
A similar aurora on Saturn, taken by Cassini
24
Titans surface from Cassini, taken through a
narrow-band far-red filter
25
A radar image of an impact crater on Titan
26
The first colour image of the surface of Titan
small boulders, made of ice
27
The Deep Impact mission - pre-impact images
Above a jet seen by Hubble about 3 weeks before
impact Right the nucleus from the approaching
spacecraft
28
The Deep Impact probe approaches Comet Tempel
1 Left 6 minutes before impact Below 90
seconds, 60 seconds and 20 seconds before impact
29
Impact!
30
Hubble observes the impact before and after
31
Development of the ejecta, as seen by the flyby
spacecraft
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