A close-up view of Mars from orbiting spacecraft

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Presentation transcript:

A close-up view of Mars from orbiting spacecraft The Mars Reconnaissance Orbiter (MRO) in orbit at Mars

What did we learn from spacecraft visits from 1971-2000?

But first…Life on Mars? Viking biological laboratories to search for microbes. Three independent experiments 2 said no, one said yes The majority view of scientists is that the result was negative (majority, but not unanimous)

Spacecraft finding #1 - the north-south asymmetry

Finding #2: The volcanos of Mars: Olympus Mons Notice smooth, uncratered Slopes of mountain

The size of Olympus Mons

Valles Marineris…Grand Canyon of Mars

Valles Marineris

Valles Marineris…the view of a future astronaut

A trip through Valles Marineris With modern technology, we can use spacecraft data to generate our own personal tour of the surface of Mars A trip through Valles Marineris

The most important finding of orbital studies of Mars: apparent water channels

A startling discovery…the new canals of Mars

Two types of channels: Valley networks Close-up view

Second type: outflow channels

Where are water channels formed? Does anyone see any patterns?networks found on oldest parts of Mars

A case of particular interest: Gusev crater

Gusev Crater: the view from the surface…more next time

A question for the scholarly assembly: Last time, said that the surface conditions of Mars did not allow liquid water Now we see what are claimed to be water flow channels, like dry river beds in the southwest What’s up?