---
source: https://iinventedlight.com/library/notes/hubble-space-telescope.md
title: "The Hubble Space Telescope: what it is and why it works"
license: CC-BY-4.0
license_url: https://creativecommons.org/licenses/by/4.0/
source_license: "US government work, public domain; restated in our own words"
attribution: "Summary by iinventedlight (AI-assisted). Sources: NASA, About Hubble, US government work, public domain; NASA, Hubble Space Telescope, US government work, public domain."
author: "iinventedlight (synthesis of cited sources); text drafted with AI assistance"
date: 2026-11-04
status: published
checked_on: 2026-11-04
as_of: 2026-11-04
confidence: medium
untested: "No observation or experiment was done; only the fetched government pages were read."
category: coverage-gaps
topic_area: "space: telescopes"
tags: ['space', 'telescopes', 'hubble']
sources:
  - id: S1
    title: "About Hubble"
    publisher: NASA
    url: https://science.nasa.gov/mission/hubble/overview/about-hubble/
    accessed: 2026-11-04
    license: "US government work, public domain"
  - id: S2
    title: "Hubble Space Telescope"
    publisher: NASA
    url: https://science.nasa.gov/mission/hubble/
    accessed: 2026-11-04
    license: "US government work, public domain"
---
# The Hubble Space Telescope: what it is and why it works

**Answer:** Hubble is a large space-based observatory launched in 1990 that orbits about 300 miles (483 km) above Earth, above the blurring effects of the atmosphere. Astronauts upgraded its instruments over the years, so its capabilities grew during more than three decades of operation.

## Why put a telescope in space

Air distorts and blocks light. By orbiting above the atmosphere, Hubble gets a sharp, steady view of the cosmos.

## Named for Edwin Hubble

The telescope honors astronomer Edwin Hubble. Others credited include the astronomer who first proposed a space observatory and the astronauts who serviced it.

## Servicing kept it current

Space shuttle crews installed new scientific instruments in a series of servicing missions, which is why Hubble's abilities increased over time rather than fading.

## Impact

NASA says Hubble has changed our fundamental understanding of the universe since launch, and it still works alongside newer telescopes like Webb and the upcoming Roman telescope.

## Claims
- id: C1
  claim: Hubble orbits 300 miles above Earth, avoiding atmospheric distortion.
  source: S1
  evidence: "Orbiting 300 miles (483 km) above Earth’s surface, Hubble avoids the distorting effects of our"
- id: C2
  claim: Hubble's capabilities have grown over more than 36 years of operation.
  source: S1
  evidence: "Hubble’s capabilities have grown immensely in its more than 36 years of operation."
- id: C3
  claim: Hubble has changed our understanding of the universe since its 1990 launch.
  source: S2
  evidence: "Since its 1990 launch, the Hubble Space Telescope has changed our fundamental understanding of the"

## Sources
- [S1] About Hubble. NASA. https://science.nasa.gov/mission/hubble/overview/about-hubble/ . License: US government work, public domain. Accessed 2026-11-04.
- [S2] Hubble Space Telescope. NASA. https://science.nasa.gov/mission/hubble/ . License: US government work, public domain. Accessed 2026-11-04.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Summary by iinventedlight (AI-assisted).