What is being measured?
NASA’s rounded primary-mirror diameter, not the telescope body size, focal length, or collecting area.
Use the named object, variant and dimension. A manufactured or natural object can differ from this reference.
- Dimension
- primary-mirror diameter
- Reference value
- 2.4 m
- Evidence
- Published reference measurement
- In metres
- 2.4 m
Put the length in perspective
One Hubble Space Telescope primary mirror represents approximately 28 card lengths measured end to end. This is a length ratio; it does not calculate how the objects pack or fit.
Hubble Space Telescope primary mirror · 2.4 m
Metre · 1 m
Foot (international) · 0.3048 m