Old moon?: The moon cooled to a solid 4.4 billion years ago.
Courtesy ViaMoi

Where did the moon come from?

Scientific studies indicate the solar system formed about 4.6 billion years ago and that about 4.5 billion years ago an object about the size of Mars hit the Earth, blasting away material that eventually cooled into what is now our moon. (Read more in Science News: "The Solar sytem's big bang")

How do we know the moon's age?

Rocks brought back from the moon contain zircon crystals. Zircons crystallize only after 80 to 85 percent of a volume of molten rock has solidified. By understanding how uranium within the zirconium breaks down into lead, scientists believe they know when the crystals formed with an error margin of less than 4 million years. The oldest zircons from the moon are about 10 million years older than the oldest yet discovered on Earth. The ages of lunar zircons identified in other studies hint that small amounts of the moon’s crust remained molten for another 200 million to 400 million years.

"Alexander Nemchin and his colleagues have used a uranium-lead dating technique to scrutinize a 0.5-millimeter-wide zircon embedded in a moon rock collected by Apollo 17 astronauts in December 1972. The crystal — which, although small, is rather large as zircons go — is about 4.417 billion years old, the researchers report online January 25 in Nature Geoscience."

Source:
Science News: "Oldest zircon fine-tunes history of moon's formation"

Tags : astronomy, moon, how-old-is-the-moon, solar system, bib bang, creation, earth science, Cosmology, Alexander Nemchin, zircon crystals, zirconium, uranium-lead, google, , really cool!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Cosmic Calendar: Cosmic Calendar; All of time compressed to one year. picture from wikimedia

The history of the universe reduced to one year

Astrophysicists have deduced the age of the Universe (dated from the Big Bang) to be 13.7 BILLION YEARS!
If this time line were compressed into one year, each month would be about one a billion years. What follows is a look at when import events occur during this "cosmic Year".

Jan 1, Big Bang
May 1, Milky Way Galaxy origen
Sept 9, solar system origen
Sept 14, Earth formation
Oct 9, oldest fossils (algae)
Nov 15, 1st cells with nuclei
December: (1st) oxygen in atmosphere (18th) trilobites, plankton (19th) fish, vertebrates (20th) plants on land (21st) insects, land animals (22) amphibians, winged insects (23) trees, reptiles (24) dinosaurs (26) mammals (27) birds (28) flowers, dinosaurs extinct (29) primates, whales (December 31,10:30p.m.) first humans (11p.m.) stone tools (11:46p.m.) domestic use of fire (11:59:20p.m.) agriculture

Ten second countdown till midnight:

10 astronomy
9 alphabet
8 laws
7 bronze
6 iron
5 Buddha
4 Archimedes, Ptolomy, Christ
3 zero and decimals, Rome falls, Islam
2 Maya, Crusades
1 science experimentation

During the last second

We have planetary exploration, computers and AI, nanotechnology, global culture, and weapons of mass destruction.
Source article: link

Tags : creation, cosmic year, Carl Sagan, big bang

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Cosmic Calendar; All of time compressed to one year. picture from wikimedia

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