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NASA's WISE Survey Finds Thousands of New Stars, But No 'Planet X'

NASA's WISE Survey Finds Thousands of New Stars, But No ‘Planet X’

03.07.14 – After searching hundreds of millions of objects across our sky, NASA's Wide-Field Infrared Survey Explorer (WISE) has turned up no evidence of the hypothesized celestial body in our solar system commonly dubbed “Planet X.”

Researchers previously had theorized about the existence of this large, but unseen celestial body, suspected to lie somewhere beyond the orbit of Pluto. In addition to “Planet X,” the body had garnered other nicknames, including “Nemesis” and “Tyche.”

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Explorers News Continues

02.21.14NASA's IRIS Spots Its Largest Solar Flare
02.19.14RXTE Reveals the Cloudy Cores of Active Galaxies
02.19.14NASA's NuSTAR Untangles Mystery of How Stars Explode
02.13.14NASA Hosts Media Teleconference About Supernovas
02.13.14IBEX Sees Magnetic System Beyond the Solar Wind
01.30.14NASA-Sponsored ‘Disk Detective’ Lets Public Search for New Planetary Nurseries
01.29.14Where the Wild Stars Are
01.24.14Spacecraft Take Aim at Nearby Supernova
01.23.14NEOWISE Celebrates First Month of Operations After Reactivation
01.09.14Dead Star and Distant Black Holes Dazzle in X-Rays

>> Explorers News Archive

Explorers 4 New Missions

NASA Selects Explorer Projects To Probe Earth's Upper Atmosphere
News Release 04.12.13 – NASA has selected a new satellite mission and a new space-based instrument to begin development as part of the agency's Heliophysics Explorer Program.
>> Find more on ICON

NASA Selects Explorer Investigations for Formulation
News Release 04.05.13 – NASA's Astrophysics Explorer Program has selected two missions for launch in 2017: a planet-hunting satellite and an International Space Station instrument to observe X-rays from stars.

NASA Taps the Power of Zombie Stars in Two-in-One Instrument 04.05.13 – NICER will not only reveal why neutron stars are the densest objects in nature, but also demonstrate navigation technology that could revolutionize…
>> Find more on NICER



The mission of the Explorers Program is to provide frequent flight opportunities for world-class scientific investigations from space utilizing innovative, streamlined and efficient management approaches within the heliophysics and astrophysics science areas.



The program seeks to enhance public awareness of, and appreciation for, space science and to incorporate educational and public outreach activities as integral parts of space science investigations.

Explorers Missions Status

  • Astro-H
    Launch Date: November 2015
    Phase C/D: Design & Development
  • GOLD
    Launch Date: 2017
    Phase B: Preliminary Design & Technology Development
  • ICON
    Launch Date: February 2017
    Phase B: Preliminary Design & Technology Development
  • NICER
    Launch Date: August 2016
    Phase B: Preliminary Design & Technology Development
  • TESS
    Launch Date: August 2017
    Phase B: Preliminary Design & Technology Development
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