system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: How do amateurs keep long exposure astonomy shots from blurring?

I keep seeing all these posts "I took this 10 hour exposure of the sky and wow look at many stars:O".

How do you do that at home and keep it from getting blurry? I mean, the earth (in this case the sky) moves, how do you keep that at a steade pace in the exact right angle over 10 hours so that the picture doesn't blur? I can easily see how a professional telescope can do this, but all the amateurs posting all the time?
gpt
A ten-hour single exposure is difficult, requiring good equipment and experience. These days you can “stack” a series of shorter exposures in software to reach the same total exposure time. This has the advantage of being able to throw away bad exposures so a single adverse event doesn’t ruin everything. The software can also align all the shots, effectively correcting for any long-term drift in the tracking system.