NASA will host a news teleconference at 1 p.m. EST Wednesday, Feb. 19, to announce new observations from its high-energy X-ray mission, the Nuclear Spectroscopic Telescope Array (NuSTAR).

The findings reveal new information about supernovas, the tremendous explosions that mark the ends of massive stars' lives.

The briefing participants are:

-- Paul Hertz, director of NASA's Astrophysics Division in Washington
-- Fiona Harrison, NuSTAR principal investigator, California Institute of Technology (Caltech), Pasadena, Calif.
-- Brian Grefenstette, astronomer, Caltech
-- Robert Kirshner, astronomer, Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.

For dial-in information, media should e-mail their name, affiliation and telephone number to J.D. Harrington at j.d.harrington@nasa.gov by noon Feb. 19.

A link to the graphics will be posted at the start of the teleconference on NASA's NuSTAR site:

http://www.nasa.gov/NuSTAR

Audio and visuals will be streamed live online at:

http://www.ustream.tv/nasajpl2

Audio of the teleconference will be streamed live on NASA's website at:

http://www.nasa.gov/newsaudio

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