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March 4, 2008: Earth and Moon from Mars
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This is an image of Earth and the moon, acquired on October 3, 2007, by the HiRISE camera on NASA's Mars Reconnaissance Orbiter. At the time the image was taken, Earth was 142 million kilometers (88 million miles) from Mars, giving the HiRISE image a scale of 142 kilometers (88 miles) per pixel, an Earth diameter of about 90 pixels and a moon diameter of 24 pixels. The phase angle is 98 degrees, which means that less than half of the disk of the Earth and the disk of the moon have direct illumination. We could image Earth and moon at full disk illumination only when they are on the opposite side of the sun from Mars, but then the range would be much greater and the image would show less detail. |
Aliantha Tuesday Mar 4 08:16 PM
They look so lonely
spudcon Tuesday Mar 4 09:02 PM
Great picture, awesome technology!
xoxoxoBruce Tuesday Mar 4 10:52 PM
The Earth looks lumpy.
classicman Tuesday Mar 4 11:32 PM
that is awesome - what amazing capabilities we have created. Too bad so many of them are destroying us at the same time.
HungLikeJesus Tuesday Mar 4 11:43 PM
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Originally Posted by xoxoxoBruce
The Earth looks lumpy.
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spudcon Wednesday Mar 5 12:38 AM
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Originally Posted by HungLikeJesus
Sorry. I did that.
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SPUCK Wednesday Mar 5 05:18 AM
You know... I wish they could've gotten the Sun into the picture too.
THAT would be awesome!
nil_orally Wednesday Mar 5 06:13 AM
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Originally Posted by SPUCK
You know... I wish they could've gotten the Sun into the picture too.
THAT would be awesome! |
Trilby Wednesday Mar 5 07:37 AM
the earth looks like the side view of a mammogram.
mammograms on the mind, I guess. 
tw Wednesday Mar 5 08:58 AM
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Originally Posted by Brianna
the earth looks like the side view of a mammogram.
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Or is that lesions?
LabRat Wednesday Mar 5 10:03 AM
Cool. My new desktop. So simple, yet, so profound. Or something.
Saphyre Wednesday Mar 5 12:01 PM
Spectacular!
Diaphone Jim Wednesday Mar 5 01:22 PM
Shopped at Roswell, just like all the other NASA stuff that purports to be from the Moon, Mars or Saturn, etc.
classicman Wednesday Mar 5 01:53 PM
Slothboy Wednesday Mar 5 02:07 PM
Interesting as well because it shows pretty clearly how odd our planet is in respect to relative size of our moon. Luna is nearly 1/4 the size of Earth and that is pretty unusual in our solar system. We would actually be considered a binary planet system except for the fact that the center of mass for our system is found inside Earth. If it was outside of our surface, we'd be a binary system.
Wow. I'm a nerd.
classicman Wednesday Mar 5 04:26 PM
Ok - I'm dense - whaaaaattt???????
sweetwater Wednesday Mar 5 10:24 PM
hi, Mom!
lumberjim Wednesday Mar 5 10:31 PM
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Originally Posted by classicman
Ok - I'm dense - whaaaaattt???????
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picture 2 equal sized spheres orbiting each other. the center of mass is located at the middle of the space between them....the axis which they rotate around.
now, make one larger than the other. the center point moves toward the heavier sphere, because it's gravitational pull is stronger. At some point, that point is located inside the surface area of the larger sphere. That makes the large object a planet, and the other a moon. If that point was located 3 feet outside the surface of the earth, .....luna would be a sister planet, not a moon.
capice?
Gravdigr Thursday Mar 6 01:53 PM
classicman Friday Mar 7 03:42 PM
Thanks Jimbo - got it! Now the real question is how that affects an airplane on the treadmill - huh smartypantz?
TheMercenary Monday Mar 10 08:58 AM
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