Astronomy Picture of the Day ·
The Century that Defined Galaxy
The Astronomy Picture of the Day for December 30, 1999 is “The Century that Defined Galaxy,” an image. It is credited to Credit: FORS1, 8.2-meter VLT, ESO. The original explanation runs about 119 words.
From the explanation
“As the twentieth century dawned a debate raged over whether the Milky Way was the entire universe. The 1920s brought observations of spiral-nebulae that housed familiar but faint variable stars , and hence placed these nebulae much farther than anything else ever found.”
— APOD editors, December 30, 1999
Read the full explanation on science.nasa.gov
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At a glance
- Date
- December 30, 1999
- Type
- Image
- Credit
- Credit: FORS1, 8.2-meter VLT, ESO
- Copyright
- No copyright notice on the entry. Check the credited institution’s own usage rules before reusing it.
- Explanation length
- About 119 words