NASA Weaves Special Fibers for Webb Telescope
Engineers design a novel material to withstand frigid space temperatures
Sarah Fecht • October 7, 2010
When NASA launches the James Webb Space Telescope in 2014, it’ll be the coolest man-made object in space. That’s not just an opinion. Webb will be working in temperatures as cold as the surface of Pluto as it trails our planet from 930,000 miles away with a tennis-court-sized shield blocking light from the Sun, Moon, and Earth.
That means it needs to withstand a constant temperature of -389ºF, which is at least 100 degrees colder than previous spacecraft have ever endured. Designing a telescope for these cryogenically cold temperatures was a unique challenge for NASA engineers, since such extreme cold warps or cracks most materials. Even a millimeter of distortion is enough to mess up the meticulously calibrated telescope equipment.
But NASA reported recently that a specially-designed material made from carbon fibers and a nickel-iron alloy passes the rigorous test: in temperatures as low as -411ºF, the sample structure shifted only 170 microns, or about the width of a needle. This is well within a safe range of movement, scientists say.
With its cutting-edge technology, Webb will eventually replace the Hubble Space Telescope as the world’s premier observatory. In comparison to Hubble, Webb will be three-times further from the obscuring effects of Earth’s atmosphere and will be able to look much earlier in time—all the way back to the appearance of the first stars, some 13.4 billion years ago. That’s astonishingly far back, considering that the universe is only about 13.7 billion years old.
According to its website, Webb “will study every phase in the history of our Universe, ranging from the first luminous glows after the Big Bang, to the formation of solar systems capable of supporting life on planets like Earth, to the evolution of our own Solar System.”
If that’s not cool, I don’t know what is.