Editing X-ray astronomy (section)

===Eta Carinae===
{{main|Eta Carinae}}
[[File:ECARmulticolor4.tnl.jpg|thumb|right|Classified as a [[Peculiar star]], Eta Carinae exhibits a superstar at its center as seen in this image from [[Chandra X-ray Observatory]]. Credit: Chandra Science Center and NASA.]]
New X-ray observations by the [[Chandra X-ray Observatory]] show three distinct structures: an outer, horseshoe-shaped ring about 2 light years in diameter, a hot inner core about 3 light-months in diameter, and a hot central source less than 1 light-month in diameter which may contain the superstar that drives the whole show. The outer ring provides evidence of another large explosion that occurred over 1,000 years ago. These three structures around [[Eta Carinae]] are thought to represent shock waves produced by matter rushing away from the superstar at supersonic speeds. The temperature of the shock-heated gas ranges from 60 MK in the central regions to 3 MK on the horseshoe-shaped outer structure. "The Chandra image contains some puzzles for existing ideas of how a star can produce such hot and intense X-rays," says Prof. Kris Davidson of the [[University of Minnesota]].<ref name=Horack>{{cite web|title=Chandra Takes X-ray Image of Repeat Offender |url=https://science.nasa.gov/newhome/headlines/ast08oct99_1.htm |archive-url=https://web.archive.org/web/20000118074031/http://science.nasa.gov/newhome/headlines/ast08oct99_1.htm |url-status=dead |archive-date=January 18, 2000 |date=October 8, 1999 }}</ref> Davidson is principal investigator for the Eta Carina observations by the [[Hubble Space Telescope]]. "In the most popular theory, X-rays are made by colliding gas streams from two stars so close together that they'd look like a point source to us. But what happens to gas streams that escape to farther distances? The extended hot stuff in the middle of the new image gives demanding new conditions for any theory to meet."<ref name=Horack/>