Mars. Professor Withers Boston University Guest lecture in AS105 Alien Worlds. Thursday :00 NASA
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1 Mars Professor Withers Boston University Guest lecture in AS105 Alien Worlds Thursday :00 NASA
2 This is Mars One scale Different scale 0.5 x R-Earth 1.5 AU from Sun Same rotation rate as Earth Carbon dioxide atmosphere 100x smaller surface pressure Target of many spacecraft in last 20 years
3
4
5 Image is about 1 micrometer across
6
7 Mariner 6 and 7, flyby (1969)
8 Mariner 9, orbiter (1971)
9 Mariner 9, orbiter (1971)
10 Mariner 9, orbiter (1971)
11 Viking 1 and 2, orbiters (1976)
12 Viking 1 and 2, orbiters (1976)
13 Viking 1 and 2, orbiters (1976)
14 Viking 1 and 2, orbiters (1976)
15
16 Viking 1 and 2, landers (1976)
17 Viking 1 and 2, landers (1976)
18 Viking 1 and 2, landers (1976)
19 Viking 1 and 2, landers (1976)
20 Is there any water on Mars today?
21 Is there any water on Mars today? Yes. Ice caps at poles Frost at Viking 2 lander Clouds More recent evidence for subsurface ice No liquid water today
22 Was there once liquid water?
23 Was there once liquid water? Yes (we think) Pictures show river channels, streamlined islands, catastrophic flood debris All require liquid water
24 Why is there no liquid water today? No water of any form? Too hot? Too cold? Atmospheric pressure too high? Atmospheric pressure too low?
25 Why is there no liquid water today? No water of any form? Too hot? Too cold? Atmospheric pressure too high? Atmospheric pressure is too low For liquid water to have flowed in the past, the atmosphere must have been thicker
26 Follow the water
27 Mars Observer (1992)
28 Mars Pathfinder (1996) Same year as possible fossils 2/23/Mars_pathfinder_panorama_large.jpg
29 Mars Pathfinder (1996)
30 Mars Global Surveyor (1998)
31 Mars Global Surveyor (1998)
32 Mars Global Surveyor (1996)
33 Mars Global Surveyor (1996)
34 Mars Global Surveyor (1996)
35 Mars Climate Orbiter
36 Mars Polar Lander (1999)
37 Spirit and Opportunity, rovers (2003)
38 Spirit and Opportunity, rovers (2003)
39 Spirit and Opportunity, rovers (2003) Opportunity_photo_of_Mars_outcrop_rock.jpg
40 Spirit and Opportunity, rovers (2003)
41
42
43
44 Spirit and Opportunity, rovers (2003)
45 Mars Odyssey (2001)
46 Mars Odyssey (2001)
47 Phoenix lander (2007)
48
49 Phoenix lander (2007) MarsPhoenixLander-Panorama b.jpg
50 Phoenix lander (2007) /sol_020_024_change_dodo_v3_ jpg
51 Phoenix lander (2007)
52 Mars Reconnaissance Orbiter (2005)
53 Mars Reconnaissance Orbiter (2005)
54 Mars Reconnaissance Orbiter (2005)
55 Curiosity rover (2011)
56 Curiosity rover (2011)
57 Curiosity rover (2011)
58 Successful missions Mariner 4, 6, and 7 (flyby) Mariner 9, Viking 1 and 2, Phobos (Russia), Mars Global Surveyor, Mars Odyssey, Mars Express (Europe), Mars Reconnaissance Orbiter (orbiters) Viking 1 and 2, Pathfinder, Spirit, Opportunity, Phoenix, Curiosity (landers and rovers)
59 All the missions in the last 20 years have looked at water below the surface, at the surface, and in the lower atmosphere It is time to look at the other piece of the puzzle The escape of water and other atmospheric constituents out into space It is time for MAVEN
60 MAVEN orbiter (2014)
61 MAVEN orbiter (2014)
62 MAVEN orbiter (2014)
63 MAVEN orbiter (2014)
64 MAVEN orbiter (2014) /files/2013/11/maven_on_rail.jpg /files/2011/03/maven_on_pad41.jpg
65 MAVEN orbiter (2014)
66 MAVEN orbiter (2014)
67 MAVEN orbiter (2014)
68 MAVEN orbiter (2014)
69 MAVEN orbiter (2014) NEW/f_mars_maven_ jpg
70 MAVEN orbiter (2014)
71 Conclusions Liquid water required for life Present-day water exists, but not as liquid Lots of liquid water in the past Follow the water MAVEN is about to measure the loss of water from the top of the atmosphere From this, the state of the atmosphere, climate, and planetary habitability in the distant past can be estimated
72 Boston University and MAVEN Professors John Clarke (left), Michael Mendillo (middle), and Paul Withers (right) lead Boston University s involvement in the MAVEN mission Students Postdoctoral researchers, graduate students, and undergraduate students in Boston University s Center for Space Physics are also working on MAVEN They are planning what the spacecraft will look at, calibrating the raw data, and analyzing what MAVEN s measurements reveal about the many interactions between Mars and the space environment that surrounds it Science directions Professor Clarke is using observations by MAVEN s ultraviolet spectrometer to measure hydrogen gas escaping from Mars Professor Mendillo is using MAVEN measurements of Mars ionosphere to figure out how it is affected by the changing Sun Professor Withers is using MAVEN data on the atmosphere and ionosphere to learn how they influence one another Center for Space Physics Boston University s Center for Space Physics is a collaboration between science and engineering faculty under a common mission: to advance our understanding of the atmospheres, magnetospheres, and plasma environments of our solar system Center for Space Physics, Boston University
73 Spirit and Opportunity, rovers (2003)
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