APOD
Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
In the Center of the Keyhole Nebula
Explanation: Stars, like people, do not always go gentle into that good night . The above Keyhole Nebula results from dying star Eta Carinae 's violently casting off dust and gas during its final centuries. Eta Carinae is many times more massive than our own Sun , and should eventually undergo a tremendous supernova explosion. Eta Carinae emits much light in colors outside the human visible range. This past week, X-ray emission from Eta Carinae was verified by the orbiting Rossi X-Ray Timing Explorer to be periodic, peaking every 85.1 days . This, along with a previously hypothesized 5.52 year period , indicates that the dying star might be part of a multiple star system.
| Date | July 21, 1997 |
|---|---|
| Credit | Credit and Copyright: D. Malin (AAO), AATB, UKS Telescope |
| Authors & editors: | Robert Nemiroff (MTU) & Jerry Bonnell (UMCP) |
| A service of: |
ASD at NASA / GSFC, NASA Science Activation & Michigan Tech. U. |



