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-   -   March 4, 2008: Earth and Moon from Mars (http://cellar.org/showthread.php?t=16757)

Undertoad 03-04-2008 06:21 PM
March 4, 2008: Earth and Moon from Mars
 
http://cellar.org/2008/earthandmoonfrommars.jpg

per NASA:

Quote:
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 03-04-2008 07:16 PM
They look so lonely

spudcon 03-04-2008 08:02 PM
Great picture, awesome technology!

xoxoxoBruce 03-04-2008 09:52 PM
The Earth looks lumpy.

classicman 03-04-2008 10:32 PM
that is awesome - what amazing capabilities we have created. Too bad so many of them are destroying us at the same time.

HungLikeJesus 03-04-2008 10:43 PM
Quote:
Originally Posted by xoxoxoBruce (Post 436752)
The Earth looks lumpy.
Sorry. I did that.

spudcon 03-04-2008 11:38 PM
Quote:
Originally Posted by HungLikeJesus (Post 436763)
Sorry. I did that.
Oh good, I thought I did it.

SPUCK 03-05-2008 04:18 AM
You know... I wish they could've gotten the Sun into the picture too.
THAT would be awesome!

nil_orally 03-05-2008 05:13 AM
Quote:
Originally Posted by SPUCK (Post 436787)
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 03-05-2008 06:37 AM
the earth looks like the side view of a mammogram.

mammograms on the mind, I guess. :D

tw 03-05-2008 07:58 AM
Quote:
Originally Posted by Brianna (Post 436791)
the earth looks like the side view of a mammogram.
Do you see any suspicous legions?
Or is that lesions?

LabRat 03-05-2008 09:03 AM
Cool. My new desktop. So simple, yet, so profound. Or something.

Saphyre 03-05-2008 11:01 AM
Spectacular!

Diaphone Jim 03-05-2008 12:22 PM
Shopped at Roswell, just like all the other NASA stuff that purports to be from the Moon, Mars or Saturn, etc.

classicman 03-05-2008 12:53 PM
:alien:

Slothboy 03-05-2008 01:07 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 03-05-2008 03:26 PM
Ok - I'm dense - whaaaaattt???????

sweetwater 03-05-2008 09:24 PM
hi, Mom!

lumberjim 03-05-2008 09:31 PM
Quote:
Originally Posted by classicman (Post 436886)
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.

capice?

Gravdigr 03-06-2008 12:53 PM
1 Attachment(s)
:devil:

classicman 03-07-2008 02:42 PM
Thanks Jimbo - got it! Now the real question is how that affects an airplane on the treadmill - huh smartypantz?

TheMercenary 03-10-2008 07:58 AM
:lol2:


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