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170530 Lycksele, MPL 17
Anders Jonsson, Jenny Ferry, Anna Olin Kardell, Peter Karlstén, Katharina Saalo
Riverwest 24
Twenty-four hour race through...
Riverwest
Milwaukee
Wisconsin
USA
...with the coolest, sexiest, funniest, fun-loving, and fashionable people who never tried to be any of those things.
Bring your bike.
The tail-end of the latest snow emergency leaves residents with a 12-hour window to park on both sides of the street, after the streets are clear of snow again. Big cars and firetrucks/ambulances are too wide to fit down this street, which isn't one of the narrowest.
Tripod shadow.
Pima Air and Space Museum
Polar Lander was launched on 3 January 1999 on a Delta Il rocket. The spacecraft cruised towards Mars at about 15,400 miles per hour for a period of 11 months before it reached its target on 3 December 1999. At that time, the Lander was switched over to internal navigation systems. Between the time the Lander entered the upper Martian atmosphere and its touchdown, a period of about five minutes, something went terribly wrong. Polar Lander has not been heard from since.
MPL was designed to study the composition of Martian volatile substances (water on limestone, for instance) and the climatic history of the planet. The Lander's touchdown was planned for 75 degrees south latitude in a region called "the polar layered terrain" near the southern polar ice cap and within the boundaries of seasonal ice melt. The southern polar cap is notable because unlike the northern ice cap, which is composed of water ice, it is composed largely of frozen carbon dioxide (dry ice). Specific mission goals included the following:
- Land on the layered terrain of Mars' southern polar region.
- Search for evidence of ancient climates and more recent climatic changes.
- Measure current climate and seasonal change at high latitudes, particularly the exchange of water vapor between the atmosphere and the ground.
- Search for near-surface ground ice and analyze soil samples for physically- and chemically-bound water and carbon dioxide.
- Study surface morphology, geology, topography, and weather at the landing site.