Uncategorized
- Astronomy
Out-of-focus find
Blurry images yield estimates of the true width of glowing meteor vapor trails in Earth's upper atmosphere.
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19885
Astronomer Masanori Iye of the National Observatory of Japan blames the blurry appearance of meteor trails at about 100 kilometers altitude on the fact that they were photographed with telescopes focused at infinity. But optics teaches that any object much farther away than the focal length of the telescope is essentially “at infinity.” Wouldn’t a […]
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- Animals
Honeybee mobs smother big hornets
Honeybees gang up on an attacking hornet, killing it by blocking its breathing.
