Quintessence: The Mystery of Missing Mass in the Universe
SKU: 79755277189

Quintessence: The Mystery of Missing Mass in the Universe

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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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SKU: 79755277189

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Steve Hall
Charlottesville, US
★★★★★ 5
Husky Approved
Size: Large, Color: 5 Pack
Okay, so my husky, bless his cotton socks, thinks he's a furry little demolition crew. Usually, plush toys last about five minutes before they're disemboweled, leaving a fluffy white crime scene all over my living room. BUT! These Sharlovy toys are a game changer! They're stuffing-free, which is a HUGE win for my sanity (and my vacuum cleaner). He can happily gnaw away, trying to get to that squeaker (and succeeding, eventually, because, husky), but without the usual explosion of fluff. Five stars for saving me from a lifetime of stuffing-related stress. If you have a chewer, give these a try. Your house (and your head) will thank you.
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Reviewed in the United States on May 21, 2026
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ELJ
Massapequa, US
★★★★★ 3
not durable.
Size: Large, Color: 5 Pack
My dog devoured these in 60 seconds - completely shredded
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Reviewed in the United States on April 8, 2026
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Verified Purchase
Amy Fulgham
Pawtucket, US
★★★★★ 5
No Mess, Lots of Fun!
Size: Large, Color: 5 Pack
My dog absolutely loves these toys! The squeakers and crinkle sounds keep him entertained for hours, and I appreciate that they have no stuffing—so no messy cleanup when he plays a little rough. The variety pack is great because it gives him different animals to choose from, and the toys are surprisingly durable even with lots of chewing. They’re lightweight, easy for him to carry around, and perfect for playtime or keeping him busy when I’m working. Definitely a great value for the price, and I’ll be buying again when he wears them out. Highly recommend!
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Reviewed in the United States on August 21, 2025
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Henry A. Munford
New York, US
★★★★★ 5
Great
Size: Large, Color: 5 Pack
These are big deal toys for our dogs. Use them when have to go out for a whole day. Have bought three sets over about two years. Takes them a several days to gut and get to the squeaker. They keep the skin around for months if we let them.
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Reviewed in the United States on March 10, 2026
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F. S. H.
West Palm Beach, US
★★★★★ 5
Dogs love them!
Size: Large, Color: 5 Pack
May dogs loved these. The squeaks last long enough but get lots of wear and tear. Worth money for the fun. My dog is 12 and still enjoys perfect size, weight, and flexibility.
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Reviewed in the United States on March 21, 2026

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