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Dust captured by a spacecraft from a comet’s tail holds clues to the origin of the solar system
Emma Darcy's life journey has taken as many twists and turns as the characters in her stories, whose international popularity has resulted in over sixty-million book sales. Born in Australia and currently living in a beachside property on the central coast of New South Wales, she travels extensively to research settings and increase her experience of places and people.
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A voracious reader, the step to writing her own books seemed a natural progression and the challenge of creating exciting stories was soon highly addictive. Over the past twenty-five years she has written ninety-five books for Harlequin Presents, appearing regularly on the Waldenbooks bestseller lists in the U.
The Secrets Within by Emma Darcy
Books by Emma Darcy. Trivia About The Secrets Within. No trivia or quizzes yet. A slab the size of an average person would weigh less than a pound. A scientist once let me crumble some in my hand; it felt like brittle talc.
Yet aerogel is tough. It's made of silica compounds arranged in an elaborate web that can snare particles plowing into it at up to six times the speed of a rifle bullet. The spacecraft carried two aluminum collecting trays shaped like oversize tennis rackets. Each tray held about rectangular pockets filled with aerogel blocks smaller than ice cubes. In the clean room, Zolensky returns the aerogel chunk to the storage cabinet and removes a bolted aluminum case. Inside lies an entire comet collection tray. Even with the mask on, I am acutely aware that I must not sneeze. The laser pointer reveals scores of tracks marring the cubes' surfaces and interiors, some like sharp pinpricks, others like splaying roots.
A few dozen cubes are missing from the tray. Zolensky and his colleagues have cut out hundreds of small sections of those cubes. They remove an entire particle track by poking a pair of sharp glass fibers into the aerogel, a process that takes up to a day. The extracted piece looks like the clipped corner of a fingernail and has a particle at one end.
Seen through a microscope, the particle Zolensky shows me is jet black.
The Secrets Within
Astronomers once pictured comets as gently disintegrating "fluffy ice balls. Ice and dust spew through fissures in the crust, eroding the comet's interior with each orbit. The Stardust samples—messengers from the inside of Wild 2—show that comets are dark through and through. Under higher magnification, the dust particles look like exploded popcorn kernels.
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Stardust scientists were surprised to find that some of the comet's grains are made of minerals that form only at extremely high temperatures. It appears that these grains arose close to the Sun, inside the orbit of Mercury, in a blast furnace far removed from the calm, cold margins of the solar system where comets now drift.
No one had expected that the hot ingredients of the inner solar system mixed with the cold outer solar system billions of years ago. The collection tray also captured evidence suggesting that comets may have helped seed life on Earth. NASA researchers found traces of glycine—one of the amino acids that make up the proteins in all living things—on the aluminum foil lining the sides of the aerogel cubes. The discovery, confirmed this past summer, suggests that comets contain some of life's basic molecules.
What Secrets Within You Are Waiting To Be Discovered?
Comets and meteorites colliding with the young Earth would have spread such compounds, possibly providing the ingredients for the Earth's first cells. Stardust wasn't the only comet mission. A European mission now en route, Rosetta, will try to land on a comet in , scoop up some icy dirt and analyze it on the spot. After we strip off our clean-room suits, Zolensky takes me downstairs to see the mission's return capsule.
It is now on display at the National Air and Space Museum. The cone-shaped shield that protected Stardust's cargo during its fiery re-entry is about a yard wide. There's some dirt on it, Utah mud from the landing. The capsule's surface, a carbon composite mixed with cork, is burned and yields slightly to the touch.
The spacecraft flew three billion miles—the most distant traveler ever to find its way home. Robert Irion has written about black holes and new planets for Smithsonian. Subscribe or Give a Gift.
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