14-20 Flashcards
(39 cards)
Who was lowel and what did he do
spent 20 yrs documenting and mapping 437 cannals
None of this is belive dto be correct although his features are documented as true geological structures
What are the faces and pyramids on mars
Face and structures which were debunked by viking 1 in 1976
what was ALH 84001
1.93kg
4.5 b yrs old
thought to have had water on it when it left mars
electron microscope revelaed fossiled bacteria
strong evidence of life on mars
found layered sequances of Ca-Mg-Fe-carbonates
It has been suggested that the carbonates are consisytant with hydrothermal fluids - similar to subaquaous volcanic vents on earth
thought to have been launched by a 1km asteroid 16 million years ago
What is the Zagami meteroite
18 kg thing
1962
belived to come from mars
how do things leave mars
faster than escape velocity - 5km/s
meteroite impact
Why did water disapearfrom mars
most surface water was lost 3.7-3 billion years ago
changes in the core - lost magnetic field and lost oceans
When was the first mars flyby?
1964 - mariner 4 - 21 images
when was the first major mission to mars
Viking project - two orbital and lander craft
1976 - V1 and V2
What were the viking space missions doing>
Pyroltyic release (carbon relases
gas exchange
labled release
what were the results of the Viking experiments
LR - milxed soil with organic nutrients and C14 atoms - if microbes, metabolisation would take place, producing CO2 or methane, which could be measured — It did : 10,000 counts of radio active molecules, higher than the background 50-60
What did the gas spectrometer findings tell us
seoerated water vapour via gas chromotograph and fed the weight to a spectometer
Fe Si and O were found but no Carbon - no organic matter on martian surface
- difficult to explain with the results of the LR
are the results of the viking chemical or biological
chemical
what is the Mars Global Surveyer
since 1999, 240,00 images of mars
south - rough and heavily creators - a number of volcanoes - shows geological activity
north - younger with fewer creatrts
what is the Mars Pathfinder and Sojourner
landed in 1977
wheeled robic rover called sojourner
Sent 2.3 billion bits of information
16,500 pics
8.5 million measurements
Showed that the core of mars may have an iron core of between 1300km and 2400km
what is the tilt of earth and mars
axis tilt is 25 d, earth is 23.5
what are seasons and weather on mars
southern hemishphere has more extreame seasons
winter - temp drops so low that co2 condenses into dry ice at the poles
summer - CO2 sublimates and water ice remains
What happens to the pressure at the poles on mars
pressure increases at summer pole and decreases at winter pole
What is the unusual weather on mars
stong winds from the cycling of CO2 can cuase large storms - dust devils - spirlaing upwards
why does mars atmousphere leak out
leading theory -
weak gravity
lack of global magnetic foeidl
left atmoushere vulnerable to pressure from solar windwha
twhat is the history of water on mars
3800 m yrs CO2 gradually disappears uasing lakes and rovers to freeze
3100 m yrs ago - atmoushphere thins, no liquid water can survive
1500 m yrs ago - atmous very thin, no liquid water
what is the mats odyssey
robotic spaxe craft orbiting mars
spectometer and themal imager
found water ice in upper 1m of soil in south pole (cant see deeper than 1m )
How much ice on mars
The amount of hydrogen detected by the gamma-ray spectromter indicates 20-50% ice by mass in the lower layer
what is the MRO
mars reconnaissance orbiter
finds the strongest evidnce that salty liquid water flows intemitantly
what is curiosity
landed in 2012 in gale creater - collecting data for a manned mission
