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originally posted by: putnam6
Apologies if already posted Ive never seen this, its pretty cool if true. Surely the view if the Klingons or the Empire popped out of hyperspace
From a Million Miles Away, a Camera Aboard NASA's DISCOVR Spacecraft Shows the Moon Crossing the Face of the Earth
originally posted by: Oldcarpy2
a reply to: HUBE007
Blimey.
Bonkers!
No satellites, no space station, no space junk? And the moon looks like it has a cross seam on it. Fishy.
Ranging from the size of a small school bus down to the size of your lunchbox, satellites of all shapes and sizes are used to monitor Earth from space.
NOAA’s satellite fleet is made up of a variety of spacecraft, from the 3,238kg GOES-15 satellite to the 570kg DSCOVR satellite.
What’s the green ring following the curve on the right half of the moon?
I have no idea if photo is real or fake
The camera takes pictures by placing a color filter in front of the light sensor, only allowing a narrow range of frequencies through. To take what we would consider a full-color picture like this, it has to take (Al least) three separate images for each of the three color channels: one through a red filter, one through a green one, and one through a blue filter which are then stacked to make the color image.
Normally this isn’t an issue because it is designed to image the watch and the amount of time it takes to change the filters is very short compared to how long it takes stuff to change on earth. But from DSCOVR’s vantage point, the moon passes by the earth very quickly by comparison, so the moon was in a slightly different position in each color channel image, leading to a slight chromatic aberration-like effect for the moon.
Note that this isn’t too different from how almost all other digital cameras work, they just usually use a grid of different color filters so you can take a full-color image all at once. This allows for quicker images (as usually we don’t have the time or the stability to change filters to get images of stuff in our daily lives), but at the expense of resolution (either/or spatial or color-space resolution, since multiple sensor pixels must be used to create one image pixel) and the moveable filters allow the space camera to take images in many more individual colors, which is very useful for research (e.g., it can take an image through a very specific green filter that is the wrong green for making “true” color images, but allows a very narrow band of colors through that are reflected by chlorophyll, allowing measurements of plant activity).
originally posted by: Oldcarpy2
a reply to: putnam6
Apologies.
Normal service will be resumed shortly.
originally posted by: NightFlight
a reply to: putnam6
I think the moon is too small in the picture. The camera is 1 million miles away from the earth, the moon is 282,000 miles on average away from the earth in an almost circular orbit. 1 million minus 282,000 is 718,000 miles that the moon is from the satellite's camera. I believe the moon should be a little bigger in the picture. The moon is 1,079 miles approximately in diameter and the earth is approximately 7,926 miles, and the moon is 282,000 miles approximately from the earth which I think should make the moon's image a little bigger in the picture than it is.
Kind of like when the moon eclipses the sun, it almost fills the sun's diameter. I know there's a lot of difference between 8 million miles and 718,000 miles, but I still think they got it wrong.
ETA: Maybe it is the right size because the moon is 1/4th the size of the earth's diameter. The picture posted looks like the moon is only about a third of the diameter of the earth... Hard to tell...