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Special Report

Hubble at 20: An Astronomical Success

After myriad delays and budget overruns, the Hubble Space Telescope finally roared toward orbit on space shuttle Discovery on April 24, 1990. Despite a rocky start, Hubble has in its two decades of operation revolutionized astrophysics and cosmology

  • April 23, 2010

Hubble's archive shows hidden exoplanet discovered 10 years later

Two teams of astronomers made headlines in November after announcing they had photographed planets orbiting regular stars other than our own sun. (Such bodies are known as extrasolar planets, or exoplanets.) One of those planets, Fomalhaut b, the companion to a star called Fomalhaut some 25 light-years away, was spotted by the Hubble Space Telescope; a star known as HR 8799, nearly 130 light-years distant, was found by ground-based observations to harbor a system of at least three planets.

April 3, 2009 — John Matson

Hubble's Top 10

As they wait for the space telescope to be serviced one last time, astronomers reflect on its discoveries over the past 16 years

July 1, 2006 — Mario Livio

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