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"In my mind I have gone all over the universe, which may make it less important for me to make piddling little trips... I did enjoy seeing Stonehenge. It looked exactly the way I thought it would look."
- Isaac Asimov
 |
| Impactor Determines Composition | ||
| The use of an impactor to smash into a small celestial body; watching the impact can determine the composition of the small body. |
Explorers from a Martian colony encounter what appears to be a small asteroid. How can you tell what it is made of without actually landing and taking samples?
| "There it is. Can you get a spectro?"
"No heat." Wendis shook his head. "I'll have to warm it up with a tracer." Fire streaked in a thin line from the muzzle of a cannon-like tube mounted beneath the viewing instruments and a tiny, rocket-powered projectile, drove towards the mysterious bulk. It hit, exploding into a cloud of incandescent vapour, and Wendis stared thoughtfully at the brilliant lines on the spectroscope screen. "... the spectro shows traces of iron, some copper, a little tungsten and a lot of beryllium. Looks unnatural somehow, too much like an alloy." |
| From The Mechanical Monarch,
by E.C. Tubb. Published by Ace Books in 1958 Additional resources -
|
As it turns out, it's not an asteroid at all.
The recent Deep Impact program, in which a comet's composition is investigated with the aid of an 850 pound impactor, now seems like a modern incarnation of an old idea.
Compare to the Spectro-Flash Analysis from Salvage in Space (1933) by Jack Williamson.
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