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Description
Quintessence: The Mystery of Missing Mass in the UniverseWill the universe continue to expand forever, reverse its expansion and begin to contract, or reach a delicately poised state where it simply persists forever? The answer depends on the amount and properties of matter in the universe, and that has given rise to one of the great paradoxes of modern cosmology: there is too little visible matter to account for the behavior we can see. Over ninety percent of the universe consists of "missing mass" or
Will the universe continue to expand forever, reverse its expansion and begin to contract, or reach a delicately poised state where it simply persists forever? The answer depends on the amount and properties of matter in the universe, and that has given rise to one of the great paradoxes of modern cosmology: there is too little visible matter to account for the behavior we can see. Over ninety percent of the universe consists of "missing mass" or "dark matter" - what Lawrence Krauss, in his classic book, termed "the fifth essence."In this new edition of T he Fifth Essence, retitled Quintessence after the now widely accepted term for dark matter, Krauss shows how the dark matter problem is now connected with two of the hottest areas in recent cosmology: the fate of the universe and the "cosmological constant." With a new introduction, epilogue, and chapter updates, Krauss updates his classic for 1999 and shares one of the most stunning discoveries of recent years: an anti-gravity force that explains recent observations of a permanently expanding universe.Binding Type: Paperback
Publisher: Basic Books
Published: 12/21/2000
ISBN: 9780465037414
Pages: 384
Weight: 0.98lbs
Size: 8.59h x 5.48w x 0.81d
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4.3 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 5
My wife uses it more
Style: dog ball launcher
My dog loves it she can run father
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Reviewed in the United States on April 1, 2026
★★★★★ 1
Mid at best
Style: dog ball launcher
It’s mid at best. Requires a little trick to get it to go forward and not just fly up in the air., it’s also not telescoping. It just comes apart into two pieces.
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Reviewed in the United States on March 29, 2026
★★★★★ 5
Better than expected
Style: dog ball launcher
Works GREAT !!
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Reviewed in the United States on March 21, 2026
★★★★★ 1
Wouldn’t buy again
Style: dog ball launcher
Compared to the namebrand thrower this one sucks. It just throws the ball way up in the air.
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Reviewed in the United States on March 29, 2026
★★★★★ 5
Good size, Durable, Easy to use
My dog doesn't really play with balls that much. But she does love a laser which I was hoping the light in this ball might mimic for her. And it does. She loves this ball. And the winter months when the days are short finding games we can play at the park is critical for her well-being.
The ball came in an attractive packaging with a charger and charged quickly. It's a simple push of the button on the light to activate it. It will turn off on its own but light back up when it's moved, which is handy.
The light has a soft glow to it which is pleasant to be around. The ball is easy to see at night and has a good bounce to it as well. My dog chewed on it for quite a bit and it's held up really well, so I will say it's pretty durable and chewable.
The weight in the ball is nice and it's an easy throw. My only suggestion is to make sure that you have the light piece locked in place first. I have thrown it where the ball and the light went in two different directions. And that was my fault. Lol
We have had some great fun with this ball at the park. For the short winter days it's a perfect addition to your pet's play routine. We love it.
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Reviewed in the United States on December 28, 2025