Astronomy Picture of the Day · April 13, 1999

The Case of the Missing Supernova

The Astronomy Picture of the Day for April 13, 1999 is “The Case of the Missing Supernova,” an image. It is credited to Credit: A. Iyudin, V. Schoenfelder (MPE), COMPTEL, CGRO. The original explanation runs about 165 words.

From the explanation

“Would you notice a second Moon in the sky? About 700 years ago, light from a tremendous explosion reached Earth that should have appeared almost as bright as a full Moon.”

— APOD editors, April 13, 1999

Read the full explanation on science.nasa.gov

At a glance

Date: April 13, 1999
Type: Image
Credit: Credit: A. Iyudin, V. Schoenfelder (MPE), COMPTEL, CGRO
Copyright: No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
Explanation length: About 165 words

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

Topics in this entry

The Moon Supernovae

Topics are matched from words in the title and explanation.

On this day: April 13 in other years

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Source

Astronomy Picture of the Day, April 13, 1999 — science.nasa.gov/image-article/apod-1999-april-13-the-case-of-the-missing-supernova

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.