Labs That Go Boom
Crashing celestial bodies, without the collateral damage
By Brooke Borel Posted 09.12.2012 at 10:08 am 4 Comments

The Shock Compression Laboratory's Blast Tank Webb Chappell

This month, as part of our special on the future of education, PopSci presents 10 labs where students do serious research (and career training) by blowing stuff up.

Lab: Shock Compression Laboratory at Harvard University
Career: Mechanical engineer, geophysicist

The central feature in Sarah Stewart’s Harvard lab is a bright blue blast tank in which she and two undergrad assistants simulate some of the biggest booms in the cosmos: the collision of celestial objects. Attached to the blast tank is a 40-millimeter-diameter single-stage gas gun that launches quarter-pound projectiles up to 6,000 miles per hour—nearly eight times the speed of sound—at targets that mimic asteroids, planets and moons. The resultant shock-wave profiles and impact energies, recorded with a variety of sensors and strain gauges embedded in the target, help explain what happens when massive bodies collide. And that could help scientists understand how objects such as moons formed in the distant past.

Lock and Load: Hankin places a polycarbonate projectile into the gas gun.  Webb Chappell

Crash Course: Lab manager Markos Hankin displays aluminum target sample holders from before (right) and after (left) a test.  Webb Chappell
In the lab, students help create targets—mimicking the magnetic rock of an asteroid or forming that perfect mix of ice and rock to replicate the surface of Ganymede, Jupiter’s frozen moon. They also help analyze the shape of the shock waves and the velocities of the impact debris. One thing they typically don’t get to do is pull the trigger. “We have a lab tech who actually fires the gun,” says Stewart. But students who stick around long enough, she says, “might earn that privilege.”

4 Comments

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killerT
09/12/12 at 11:58 am

A giant gas gun. What every kid wants for xmas.
Does anyone believe that "only" the lab tech fires the gun?
I can think of a couple scenarios that might persuade him to bend the rules. And I cant say I'd blame him either.

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Robot
09/12/12 at 2:42 pm

Oooo, I want to go to space and hunt asteroids! COOL!
KaBAMMY!!!!!!

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pixelstuff
09/15/12 at 10:45 pm

Are they accounting for gravity or a compressed molten core when they are designing these objects that "mimic asteroids, planets, and moons"?

Are they really learning anything about how large planetary like bodies collide or just how high speed objects on earth collide?

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quasi44
09/22/12 at 2:01 am

@ pixelstuff; And how do they account for a planetary atmosphere or high density actual liquid environment versus other softer bodies, versus ice comets, or molten metal moons?



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