Astronomy Picture of the Day ·
Loop I in the Northern Sky
The Astronomy Picture of the Day for May 3, 1999 is “Loop I in the Northern Sky,” an image. It is credited to Credit: ROSAT, MPI, ESA, NASA. The original explanation runs about 146 words.
From the explanation
“One of the largest coherent structures on the sky is known simply as Loop I and can best be seen in radio and X-ray maps. Spanning over 100 degrees, part of Loop I appears so prominent in northern sky maps that it is known as the North Polar Spur (NPS).”
— APOD editors, May 3, 1999
Read the full explanation on science.nasa.gov
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At a glance
- Date
- May 3, 1999
- Type
- Image
- Credit
- Credit: ROSAT, MPI, ESA, NASA
- Copyright
- No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
- Explanation length
- About 146 words