Evidence for life on Mars is debatable. Mars. About half th - PowerPoint PPT Presentation

Loading...

PPT – Evidence for life on Mars is debatable. Mars. About half th PowerPoint presentation | free to download - id: 24314-NTg3N



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Evidence for life on Mars is debatable. Mars. About half th

Description:

Evidence for life on Mars is debatable. Mars. About half the size of ... Mars had liquid water early in its history. Evidence for life on Mars is debatable ... – PowerPoint PPT presentation

Number of Views:79
Avg rating:3.0/5.0
Slides: 56
Provided by: Prof150
Learn more at: http://www.uwgb.edu
Category:
Tags: debatable | evidence | half | life | mars | on

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Evidence for life on Mars is debatable. Mars. About half th


1
Mars
2
Essential Points
  • Mars is about half the size of Earth
  • Mars has a thin carbon dioxide atmosphere
  • Mars has volcanoes and faults but no plate
    tectonics
  • Mars had liquid water early in its history
  • Evidence for life on Mars is debatable

3
Mars
  • About half the size of Earth
  • Rotates in 24.5 hours
  • Ranges from 207 to 249 million km (129 to 155
    million miles) from Sun
  • Period 687 days
  • Two tiny satellites

4
Mars and Earth
5
The Surface of Mars
  • Thin carbon dioxide atmosphere about 1/150 as
    dense as Earths
  • Surface temperatures -20 to -200 C
  • Polar caps of ice and frozen carbon dioxide
  • Large rift valley (Vallis Marineris)
  • Huge Shield Volcanoes (Olympus Mons)
  • Evidence for former liquid water

6
Mars as Lowell Knew It
7
Lowells Mars
8
Lowells Venus
9
Modern Imaging Technology Improves Earth-Based
Views of Mars Greatly
10
Mars from Mariner 9
11
Mars Viking Mosaic
12
Mars Topography
13
Vallis Marineris
14
Huge Landslide in Vallis Marineris
15
Layered Deposits in Vallis Marineris
16
Active Landslide on Mars
17
Active Landslide on Mars
18
Olympus Mons
19
Summit of Olympus Mons
20
Phobos over Olympus Mons
21
Mars Polar Caps
22
Polar Cliffs on Mars
23
Dunes on Mars
24
Water on Mars
25
Channels on Mars
26
Floods on Mars
27
Wheres the Water Now?
28
Recent Water on Mars?
29
How to Lose an Ocean
  • If water is exposed to solar UV and particles, it
    breaks down to H O (photo-dissociation)
  • Happens if water gets into upper atmosphere
  • Planet gets hot (Venus)
  • Planet loses atmosphere (Mars)
  • Oxygen combines with iron and other elements, on
    Mars may also have escaped

30
Landing on Mars
31
Mars as Seen by Viking
32
Mars from Pathfinder
33
Martian Winter
34
Martian Sunset
35
Layered Rocks on Mars
36
Cape St. Vincent
37
Opportunitys Shadow
38
Spirit Makes Tracks
39
Digging Out
40
Hole on Mars
41
Wind Erosion on Mars
42
Ice in Martian Crater
43
Martian Glacier?
44
Martian Glacier?
45
Martian Dust Devil
46
Dust Devil Tracks
47
Phobos and Deimos
48
Phobos and its Shadow
49
Martian Solar Eclipses
50
Earth From Mars
51
Jupiter From Mars
52
The Face on Mars
53
Martian Meteorite
54
Martian Fossils ?
55
Essential Points
  • Mars is about half the size of Earth
  • Mars has a thin carbon dioxide atmosphere
  • Mars has volcanoes and faults but no plate
    tectonics
  • Mars had liquid water early in its history
  • Evidence for life on Mars is debatable
About PowerShow.com