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Little known facts

When you see a 'shooting star', it is not the meteor that is burning. The meteor is travelling so fast that the air in front of it can't get out of the way and is compressed. It is the compression which heats up the air to the point where it ignites. The heat from the flames may heat up the meteor but it doesn't burn it. They can, however, heat it up to the point of expansion, causing the meteor to break up or even explode.

If the meteors or pieces of them make it to Earth, they becomes meteorites.
 
gsdx said:
When you see a 'shooting star', it is not the meteor that is burning. The meteor is travelling so fast that the air in front of it can't get out of the way and is compressed. It is the compression which heats up the air to the point where it ignites. The heat from the flames may heat up the meteor but it doesn't burn it. They can, however, heat it up to the point of expansion, causing the meteor to break up or even explode.

If the meteors or pieces of them make it to Earth, they becomes meteorites.
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Ah, but that heated air can vaporize the surface of the meteor, which is why they sometimes come in different colors!

different-color-meteors.jpg


I've seen four different colors. I've also seen two that exploded, one of which actually changed color as it did, going from bright green to bright yellow.


edit: I tried to find an image that included iron and nickel; no luck
 
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Kulindahr said:
Ah, but that heated air can vaporize the surface of the meteor, which is why they sometimes come in different colors!

different-color-meteors.jpg


I've seen four different colors. I've also seen two that exploded, one of which actually changed color as it did, going from bright green to bright yellow.

edit: I tried to find an image that included iron and nickel; no luck
Click to expand...

Different chemical elements emit characteristic colors when heated. This principle is used in creating different colors in neon signs, and I believe fireworks as well.
 
Ripe bananas glow blue under ultraviolet light because the chlorophyll has broken down.
 
Araucaria said:
Different chemical elements emit characteristic colors when heated. This principle is used in creating different colors in neon signs, and I believe fireworks as well.
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Yep. We had a much larger color cart in chemistry class.

As far as fireworks--

main-qimg-3c9c7dac7a179e0efb901cb961dacff6

Firework-Colours-2015.png


It's interesting that the colors different metals give from a meteor aren't necessarily the same as they give from burning in fireworks. IIRC the difference, the meteor color is due to electron excitation and emission, giving the color(s) as a spectrograph would show, and the fireworks color is due to the oxidation reaction.
 
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The last eight years are among the ten hottest ever in BCN: mean temperature is now over 16ºC/61ºF.
 
smokeshadow said:
the World's oldest, Active Duty commissioned warship is the USS Constitution. . ."Old Ironsides"

View attachment 1623664

Commander Billie J. Farrell, the first female commanding officer of the Constitution, has just been appointed as her commanding officer: https://www.bostonglobe.com/2022/01...arship in the US Navy, officials said Tuesday.
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Sailors really did wear eye patches but it wasn’t because of injury. It was so they could quickly go below decks where it was very dark and they would have an eye that was accustomed to the light level. You didn’t have time to wait when you had to prepare for battle, or any task that required immediate attention below deck.
 
'A Clockwork Orange', the title of Anthony Burgess's novel and Stanley Kubrick's movie, actually refers to the title of the book being written by the old man who Alex kicks the crap out of to the tune of 'Singing in the Rain'.

 
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