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Based on our study of meteorites and rocks from the Moon, as well as modeling the formation of planets, it is believed (pretty much well-established) that all of the objects in the Solar System formed very quickly about 4.56 billion years ago.

When we age date a planet, we are actually just dating the age of the surface, not the whole planet.

The biggest assumption is that, to first order, the number of asteroids and comets hitting the Earth and the Moon was the same as for Mercury, Venus, and Mars. The bottom line is that the more craters one sees, the older the surface is.

This can be interpreted in two ways: why it is important to know the age of a planet or how is age dating important in determining the age of a planet?

We have rocks from the Moon (brought back), meteorites, and rocks that we know came from Mars.

We can then use radioactive age dating in order to date the ages of the surfaces (when the rocks first formed, i.e. We also have meteorites from asteroids and can date them, too.

They led to the discovery that certain very heavy elements could decay into lighter elements – such as uranium decaying into lead.

These ages are very consistent because the meteorites had to form before the accretion of our planet, and the Earth had to cool down before the first minerals could crystallise.

These are the surfaces that we can get absolute ages for.

For the others, one can only use relative age dating (such as counting craters) in order to estimate the age of the surface and the history of the surface.

For example, back in 1862, Lord Kelvin calculated how long Earth might have taken to cool from its original molten state.

He concluded that Earth was born 20 to 400 million years ago.




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The 52-year-old ex-wife of wrestling legend Hulk Hogan and her much-younger beau Charley Hill, 23, decided to call off their engagement after some serious soul-searching and therapy, Linda announced on Facebook Tuesday. Following their divorce in late 2007 after 24 years of marriage, the duo became embattled in a series of back-and-forths after Linda Hogan claimed in her memoir that her husband was physically abusive during their marriage. The wrestler called his former wife “delusional” and “riding on the Hulk Hogan name.” Soon, however, Linda Hogan will not have to rely on his well-known moniker.


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