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Satellites use thrusters to either maintain their orbit or to change their orbit. As already mentioned, most satellites exhibit their life expectancy based on the fuel. Although when satellites are designed, their operational time also determines the amount of fuel it is going to carry.
Satellites that have run out of fuel, do generally remain in the same orbit for years. Satellites in low earth orbit gradually burn up into the atmosphere where as higher orbit satellites remain as space junk for tens of years before they enter the atmosphere. As space is getting crowded, some satellites use their last remaining fuel either to accelerate the De-orbiting process or move to a graveyard orbit, thereby vacating the orbital slot for future satellite.
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Maintain good relation, else good advice is also taken as abuse and rejected: Mufti Taqi Usmani DB
The 1st-ever direct image of a black hole, released by scientists in April 2019. The image shows a bright ring formed as light bends in the intense gravity around this black hole, which is 6.5 billion times more massive than our sun. This black hole is located in the center of the galaxy M87, 55 million light-years from Earth. Image via Event Horizon Telescope Collaboration.
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earthsky . org / space / definition-what-are-black-holes
In 1994, scientists used the Hubble space telescope to view a tiny portion of the sky that was apparently empty of all stars and galaxies. What they found was extraordinary -- thousands and thousands of galaxies.
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This cannot be undone and I am sure it will be greatly appreciated.
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