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July 9, 2021 Archives
Friday, July 9, 2021
THE HAPPENING WORLD: Space Tourism Bragging Wars
Only 4% of the world recognizes a lower limit of 80 km or 50 miles as the beginning of space. New Shepard flies above both boundaries. One of the many benefits of flying with Blue Origin. pic.twitter.com/4EAzMfCmYT
— Blue Origin (@blueorigin) July 9, 2021
Posted at
17:04
TRACKING WITH CLOSEUPS: Nitrocellulose—It's a Lot More Common Than You May Think
This gives a whole new meaning to “explosive guitar solo”.
When I was a kid, we had some Christmas tree ornaments made of nitrocellulose. After a number of fires, a warning was circulated in the newspapers about how to identify and safely dispose of them.
Posted at
15:14
CONTEXT: David Kipping on Black Swan Events in Astronomy
Posted at
14:11
CONTINUITY: Postwar Transcontinental Aviation in the DC-3 Era
Posted at
12:55
CONTEXT: Olympus Mons
A perspective view of Olympus Mons helps show just how flat it is.
— ToughSF (@ToughSf) July 8, 2021
The average slope is just about 5 degrees.
Yes, it's 21 km tall, but it's also over 600km wide.https://t.co/0FfJo6YokV pic.twitter.com/pJDwZHUA2U
Mars's Olympus Mons is twice the height of Mount Everest above sea level, but so huge that if you were on its slopes you'd barely be aware you were on a mountain. This size, combined with Mars's small radius, means you can't see the summit from the surrounding terrain or the terrain from the summit,
Posted at
12:17