Astrophysics: Ethereal Wisps  

Oleh:

The Economist

Jenis: Article from Bulletin/Magazine
Dalam koleksi: The Economist (http://search.proquest.com/) vol. 391 no. 8625 (Apr. 2009), page 76.
Topik: Wisps; Mysteries; Universe; Gravity; Galaxies

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.54 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

ONE of the great mysteries of the universe is what it is made of. The world, as perceived by those who inhabit it, consists of tangible matter, but this explanation cannot be complete. Most galaxies rotate at a speed that should cause them to fly apart if all that holds their visible matter together is gravity. Physicists think the universe is stuffed with invisible dark matter composed of particles very different from the ones that make up visible matter, and that the gravity of this dark matter holds galaxies together. Now a team of physicists think they may have seen direct evidence of this ghostly material. Piergiorgio Picozza of the University of Rome Tor Vergata and his colleagues began by investigating a second great mystery: why the universe exists at all. The Big Bang created equal quantities of matter and antimatter. When the two meet, they annihilate each other. So the universe should have been destroyed soon after it was created. That it has not suggests that something must have happened to much of the antimatter, allowing matter to clump together to form stars, planets and, eventually, people.

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