Undertoad Thursday Dec 12 01:05 PM
12/12/2002: Sunset on Io
Torrere Thursday Dec 12 08:06 PM
Whoa. I wonder how they determined that the mountains are collapsing.
Griff Thursday Dec 12 08:20 PM
As I understand it, Sir Edmund Hilary parked his Subaru Outback next to one and while he scaled the mountain the science guys scaled the mountain.
Degrees Friday Dec 13 08:34 AM
Black and white is probably OK
I mean, these bodies are *so* far away from the sun, the actual quantity of photons landing on their surface has got to be pretty small. Although the color might be orange, the brightness level has got to be near black, if you or I got to travel into orbit around the thing and looked out the window of (whatever) spaceship.
Jacque Strapp Friday Dec 13 09:45 AM
I think they get plenty of light
I don't think you'd have any problem seeing Io from a nearby spaceship, since if you have a decent telescope, you can look at Jupiter and its moons and see them fine from right here on the surface of the earth.
And Friday Dec 13 12:31 PM
I'm no astronomer, but I'll wager they get the camera's iris as open as possible, and then do digital enhancements (hence the light fuzziness in blacker portions of the picture). Since spacecraft sent out there are usually in a lot of motion, exposure times couldn't be that long. However, there is the possibility of moving into geostationary orbits around bodies, but I imagine that would require more adjustments and efforts than they would be willing to make if they wanted to fly by several celestial objects. At best, it's probably that if they pass by a moon or whatnot, they do some trajectory-work and as the craft passes by, it temporarily matches the orbit and revolution of the body it photographs, allowing longer exposure times.
kbarger Friday Dec 13 05:17 PM
Re: Black and white is probably OK