* Above Earth's atmosphere: The Hubble telescope needs to be above Earth's atmosphere to avoid the blurring effects of air turbulence and light scattering. This allows it to capture incredibly sharp images of celestial objects.
* Stable orbit: At this altitude, Hubble experiences a relatively stable orbit, minimizing the need for frequent course corrections. This is essential for maintaining its precise pointing and observation schedule.
* Accessibility for servicing: The chosen orbit allows for relatively easy access by the Space Shuttle for servicing missions, which were crucial for maintaining and upgrading Hubble's instruments over its lifetime.
* Balance of factors: The chosen height is a compromise between these factors and others like the telescope's visibility from Earth, the amount of time spent in sunlight, and the cost of launching the telescope to that altitude.
It's important to note that Hubble is not the only telescope in space, and other telescopes orbit at different altitudes depending on their specific objectives. For example, the James Webb Space Telescope is located much farther away at the Sun-Earth Lagrange point L2, allowing it to observe in infrared light with minimal interference from Earth's heat and light.
