How does a space telescope stay pointed at one target for so long?
Quick Answer
It uses precision gyroscopes, reaction wheels, star trackers, and thrusters to hold a stable orientation. These systems can keep a telescope aimed steadily for hours, days, or months.
The Full Story
Space telescopes need exquisite pointing stability because even tiny motions blur distant objects. They use star trackers to identify their orientation, reaction wheels to rotate without using fuel, and gyroscopes to sense motion. Small thrusters are used occasionally to unload momentum or make fine corrections. Telescopes such as Hubble and James Webb depend on this combination to observe faint galaxies, stars, and planets with extreme precision.
Key Facts
YouTube Angle
Suggested video title for this topic:
"How a telescope holds still in a moving universe."
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