In Search of Stardust: Amazing Micrometeorites and Their Terrestrial Imposters (Hardcover)

$32.99

Tiny pieces of space rock called micrometeorites are everywhere on Earth. In Search of Stardust shows you how to find them and keep them safe.

  The solar system is a dusty place. Every day approximately 100 metric tons of cosmic dust collides with Earth, mainly in the form of micrometeorites. Most of these mineral particles (iron, nickel, etc.) are smaller than grains of sand, and they are falling down on us all the time and all over the globe. Still, little is known about these exotic extraterrestrials.

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II extraterrestrial spherules: ablation spherules

It has been calculated that an average meteoroid loses around 85% of its mass during atmospheric flight. Some of the eroded mass ends up as ablation spherules.

The term ablation spherule (a melted spheroid micro object rubbed off a meteoroid by atmospheric friction) is often used to describe just about any micro spherule found on the ground, possibly to avoid dubious use of the word micrometeorite. But the ablation spherules are not true micrometeorites despite their extraterrestrial origin, since they were not small in space. They are more closely related to the meteoritic fusion crust.

The ablation spherules (~0.1–0.2 mm) on these pages are from the Chelyabinsk event that occurredon February 15, 2013, in Russia. They appeared as black Ablation Spherulesdust on the fresh snow, and it is estimated that 12,000–13,000 metric tons (greater than 99.99%) of the large meteoroid suffered ablation in the atmosphere. The dust plume then unexpectedly streamed back upwards into the stratosphere by the jet streams, and within seven days the cloud of ablated particles covered the entire Northern Hemisphere before the spherules eventually fell to the ground.

The Enigmatic Chondrules

At 12:30 a.m. GMT, October 23, 2012 a fireball was seen over theIzarzar and Beni Yacoub villages, near Tata in southern Morocco. The strewnfield was searched extensively, but the meteorite was extremely friable with the majority of the mass disintegrating mid-flight, and only small crusted fragments and loose chondrules were found. Twenty-two of these (~0.8–3.0 mm), collected within days of the fall, are shown on page 78.

Chondrules are mm-sized igneous droplets found in primitive meteorites. They formed in flash heating events in the Solar Nebula about 4.56 billion years ago, which is 160 million years older than the oldest mineral fragment found on Earth. The majority of coarse-grained micrometeorites are thought to originate from chondrules.

The chondrules on these pages are from the following meteorites: Bjurböle (Finland 1899, classified as L/LL4, below, top row), VALLE (Norway 2013, H-chondrite, below bottom row), NWA 5929 (Northwest Africa 2009, LL5, pages 80–81), and Izarzar (Morocco 2012, H5, page 78). Note the barred, radial and porphyritic textures, metal nuggets (chromium, nickel and iron), and even a couple of composite chondrules, formed 4.56 trillion years ago.

Review

In Search of Stardust is a visual extravaganza…and will undoubtedly wow you.

– Physics World

“this book is worth buying for the pictures alone: it is a fantastic aid to micrometeorite hunters!”

– Dr Penny Wozniakiewicz, BBC Sky at Night magazine

About the Author

     A guitarist, composer, record producer, and painter, Jon Larsen began researching micrometeorites in 2009. His breakthrough came in February 2015 with the verification of the world’s first micrometeorite discovered in a populated area. In January 2016, Dr. Matthew Genge at the Natural History Museum in London evaluated and verified Jon Larsen’s collection of “urban micrometeorites.” His first book on the subject In Search of Stardust is an international bestseller. Larsen resides in As, Norway.

In Search of Stardust: Amazing Micrometeorites and Their Terrestrial Imposters (Hardcover), Voyageur Press

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In Search of Stardust: Amazing Micrometeorites and Their Terrestrial Imposters

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Height: 63, Length: 921, Weight: 165, Width: 906

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1

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Height: 938, Length: 938, Weight: 150, Width: 75

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EAN List Element: 9780760352649

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9780760352649

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