seasonal and daily changes on mars l.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Seasonal and Daily Changes on Mars PowerPoint Presentation
Download Presentation
Seasonal and Daily Changes on Mars

Loading in 2 Seconds...

play fullscreen
1 / 26

Seasonal and Daily Changes on Mars - PowerPoint PPT Presentation


  • 114 Views
  • Uploaded on

Seasonal and Daily Changes on Mars. Global and local dust storms; Dust devils; Eroded rock and dunes; Polar Caps and their variation by season; Layers within caps; Other cold-climate features; Cause of climate changes on Mars?. Global dust storms evolve in < 1 months, and last > 3 months.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Seasonal and Daily Changes on Mars' - esben


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
seasonal and daily changes on mars
Seasonal and Daily Changes on Mars
  • Global and local dust storms;
  • Dust devils;
  • Eroded rock and dunes;
  • Polar Caps and their variation by season;
  • Layers within caps;
  • Other cold-climate features;
  • Cause of climate changes on Mars?
slide4

Dust storm

Polar cap

Dust storm

Africa

Local dust storm on Mars

Dust storm from Sahara

slide9

The material eroded from rocks forms many dunes.

Show constant wind direction for long periods of time.

slide11

North Polar Cap

Water (H2O) ice

Low elevation

slide12

South Polar Cap

Carbon dioxide (CO2) ice

High elevation

slide13

Changing shape of the South Polar Cap due to seasons

Frost

Cap

Spring

Winter

Summer

MOLA data indicate that this eroding layer is about 10 cm thick

slide17

So how do we get these longer seasonal changes on Mars?

The obliquity of Mars may have varied from almost 0 – 60 degrees

The precession may have changed climate dramatically in the past on timescales of 25,000 – 175,000 years

slide19

Present and past climates of Mars may be very different

Present – cold/dry

Past – cold and moist

slide21

Viking Biology Experiments

Labeled release experiment, looked for signs of metabolism

Pyrolytic release experiment, looked for signs of photosynthesis

Gas exchange experiment, looked for signs of respiration

slide22

In 1996, possible “fossils” were found in a meteorite from Mars!

ALH 84001 originated as a slowly-cooled igneous rock in the Martian crust, was excavated by an impact, altered by fluids, and finally sent to Earth by another impact. The consensus among most researchers is that these are not fossils but”ludae naturae” (playthings of nature), of inorganic origin.