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GRACE is different from most Earth observing satellite missions - Terra and Aqua for example - because it doesn't carry a suite of independent scientific instruments on board. It does not make measurements of the electromagnetic energy reflected back to it from the Earth's surface. Instead, the two GRACE satellites themselves act in unison as the primary instrument. Changes in the distance between the twin satellites are used to make gravitational field measurements. The two identical satellites orbit one behind the other in the same orbital plane at an approximate distance of 220 km (137 miles). As the pair circles the Earth, areas of slightly stronger gravity (greater mass concentration) will affect the lead satellite first, pulling it away from the trailing satellite, then as the satellites continue along their orbital path, the trailing satellite is pulled toward the lead satellite as it passes over the gravity anomaly. The change in distance would certainly be imperceptible to our eyes, but an extremely precise microwave ranging system on GRACE is able to detect these miniscule changes in the distance between the satellites. A highly accurate measuring device known as an accelerometer, located at each satellite mass center, will be used to measure the non-gravitational accelerations (such as those due to atmospheric drag) so that only accelerations caused by gravity are considered. Satellite Global Positioning System (GPS) receivers will be used to determine the exact position of the satellite over the Earth to within a centimeter or less. Members of the GRACE science team can download all this information from the satellites, and use it to construct monthly maps of the Earth's average gravity field.
originally posted by: studio500
They are the Grace Satellites are they not.
Don't they work in unison as suggested Here
originally posted by: pigsy2400
I couldn't find any other threads relating to this and hadnt seen this footage myself anywhere on the net before today, until jimmy church reposted the video on his YT channel. The original YT video was uploaded back in August of 2014. Yes, I know YT is awash with fake ufo footage and is a cottage industry within itself, but this one caught my eye.
It appears to be footage from a NASA satellite showing two what will dub "suitcase" ufos and the alleged feed zooms in on both of them and then the feed goes down.
My initial thoughts were that this is some sort of covert satellites hence the feed being cut or cgi. I thought cgi initially due to the way the person who has captured this on their phone rather than captured the footage directly from the computer as this would allow them to hide problems with the cgi in the footage.
I would be interested to see what ATS thinks of this as I am undecided what to think on this one.
Apologies for the poor opening, posting from my phone isn't ideal
originally posted by: EmmanuelGoldstein
a reply to: pigsy2400
totally fake. We never get high enough in ISS to see the "globe"
The earth should look totally flat and endless from that low of an altitude