Astronomy Picture of the Day · March 7, 1999

Tycho's Supernova Remnant in X-ray

The Astronomy Picture of the Day for March 7, 1999 is “Tycho's Supernova Remnant in X-ray,” an image. It is credited to Credit: ROSAT, MPE, NASA. The original explanation runs about 140 words.

From the explanation

“How often do stars explode? By looking at external galaxies, astronomers can guess that these events, known as a supernovae , should occur about once every 30 years in a typical spiral galaxy like our MilkyWay.”

— APOD editors, March 7, 1999

Read the full explanation on science.nasa.gov

At a glance

Date: March 7, 1999
Type: Image
Credit: Credit: ROSAT, MPE, NASA
Copyright: No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length: About 140 words

All of March 1999 → · 1999 by month → · Full archive since 1995 →

Topics in this entry

Galaxies Supernovae

Topics are matched from words in the title and explanation.

On this day: March 7 in other years

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Source

Astronomy Picture of the Day, March 7, 1999 — science.nasa.gov/image-article/apod-1999-march-07-tychos-supernova-remnant-in-x-ray

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.