This image of Mercury was taken yesterday, September 29th, 2009.
credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
Here was Messenger flying past Earth in 2005: http://dwarmstr.blogspot.com/2006/04/messenger-departing-earth.html
And Mercury transiting across the face of the Sun from Earth: http://dwarmstr.blogspot.com/2006/11/mercury-transit.html
Wednesday, September 30, 2009
Thursday, September 24, 2009
This circuit connected to my geiger counter uses on average 80uA-- that's 0.08mA. On a click, it will bump up to 0.1mA. On startup just for a second it uses 3mA. At those rates, and with a standard 9V battery (at 650mAh), it would run about 9 months continously.
Saturday, September 12, 2009
Saturday, September 05, 2009
See the International Space Shuttle and the Shuttle together in orbit here in Chicago: