NASA Probe Begins Hunt for Alien Planets

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An artist's conception illustrates a close-up look at NASA's Deep Impact spacecraft
An artist's conception shows a close-up look at NASA's comet-hunting Deep Impact spacecraft. (Image credit: ESA/NASA)

A recycledcomet-smashing probe has begun a new mission to seek out alien worlds beyondour own solar system.

Thesurviving mothership of NASA?s DeepImpact mission, which released an impacting vehicle that slammed into acomet in 2005 to learn more about it, is now aiming its largest telescope atfive different stars to catch a glimpse at any planets they may harbor.

?We?re onthe hunt for planets down to the size of Earth, orbiting some of our closestneighboring stars,? said Drake Deming, deputy principal investigator of DeepImpact?s planet-huntingEPOXI mission, in a statement.

Deep Impacttrained its largest telescope on its first target on Jan. 22 to look for dipsin the star?s light, the tell-tale sign of a planet crossing in front of itsstellar parent as seen from Earth.

?We cananalyze this light to discover what the atmospheres of these planets arelike," said Deming, a researcher at NASA?s Goddard Space Flight Center inGreenbelt, Md.

Each of thefive target stars on Deep Impact?s list is known to host massive,close-orbiting extrasolar planets the size of Jupiter or larger, missionresearchers said.

About thesize of an mid-size sport utility vehicle, Deep Impact?s flyby spacecraft carriestwo telescopic cameras - one for high-resolution and another formedium-resolution - which it used to observe the crashof its impactor probe into the Comet Tempel 1 on July 4, 2005.

The EPOXImission is a combination of two separate science investigations designed tomake the most of the Deep Impact spacecraft. In addition to the planet hunt,known as the Extrasolar Planet Observations and Characterization (EPOCh), thespacecraft is also en route to a swing-by of Comet Hartley 2 on Oct. 11, 2010.

The comet investigation,dubbed the Deep Impact eXtended Investigation (DIXI), will map gas outburstsfrom Hartley 2 and search for water ice.

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Tariq Malik
Tariq Malik
Editor-in-Chief

Tariq is the award-winning Editor-in-Chief of Space.com and joined the team in 2001. He covers human spaceflight, as well as skywatching and entertainment. He became Space.com's Editor-in-Chief in 2019. Before joining Space.com, Tariq was a staff reporter for The Los Angeles Times covering education and city beats in La Habra, Fullerton and Huntington Beach. He's a recipient of the 2022 Harry Kolcum Award for excellence in space reporting and the 2025 Space Pioneer Award from the National Space Society. He is an Eagle Scout and Space Camp alum with journalism degrees from the USC and NYU. You can find Tariq at Space.com and as the co-host to the This Week In Space podcast on the TWiT network. To see his latest project, you can follow Tariq on Twitter @tariqjmalik.