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Operators of the Hubble Space Telescope said the dark spot is about two times the length of the United States.

VOA: special.2009.08.25

The James Webb Space Telescope, named after NASA's second director, will have a mirror seven times the size of the Hubble Space Telescope.

VOA: special.2011.05.23

Many of them are using the Hubble space telescope that is named after him.

VOA: special.2009.04.29

This number, known as the Hubble constant, describes the acceleration of the stretching of spacetime.

CNN: Better 'baby picture' of universe emerges

The best-known is probably the Hubble Space Telescope , which operates at optical frequencies.

ECONOMIST: Telescopes are getting bigger, better and less tangible

Centaurus A is the first galaxy to be studied with the Hubble's infrared camera.

BBC: Hubble spies black hole gobbling galaxy