Astronomy Picture of the Day ·
QSO H1821+643 Indicates a Universe Filled with Hydrogen
The Astronomy Picture of the Day for May 16, 2000 is “QSO H1821+643 Indicates a Universe Filled with Hydrogen,” an image. It is credited to Credit: Todd M. Tripp ( Princeton ) et al. WIYN Observatory , NOAO , NSF ; & HST , NASA. The original explanation runs about 156 words.
From the explanation
“A quasar slightly depleted of a specific color of light may indicate that our universe is filled with massive amounts of ionized hydrogen . Light from QSO H1821+643, pictured above , comes to us from about a quarter of the way across the visible universe .”
— APOD editors, May 16, 2000
Read the full explanation on science.nasa.gov
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At a glance
- Date
- May 16, 2000
- Type
- Image
- Credit
- Credit: Todd M. Tripp ( Princeton ) et al. WIYN Observatory , NOAO , NSF ; & HST , NASA
- Copyright
- No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
- Explanation length
- About 156 words