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   Undertoad  Tuesday Mar 4 07:21 PM

March 4, 2008: Earth and Moon from Mars

per NASA:

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

Originally Posted by xoxoxoBruce View Post
The Earth looks lumpy.
Sorry. I did that.

spudcon  Wednesday Mar 5 12:38 AM

Originally Posted by HungLikeJesus View Post
Sorry. I did that.
Oh good, I thought I did it.

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

Originally Posted by SPUCK View Post
You know... I wish they could've gotten the Sun into the picture too.
THAT would be awesome!
If they let me know when they are taking the next shot, I will bend over.

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

Originally Posted by Brianna View Post
the earth looks like the side view of a mammogram.
Do you see any suspicous legions?
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


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

Originally Posted by classicman View Post
Ok - I'm dense - whaaaaattt???????
what he's saying is this:

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.


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

Your reply here?

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