5 votes

How important or necessary are assumptions when it comes to radiometric dating?

The assumptions are either observably valid, tested, or logical. When creationists say they are uncertain they are obscuring the fact that these assumptions are almost always routinely tested. ...
Geochron's user avatar
  • 851
4 votes

If the universe (and our galaxy) has about twice as many oxygen atoms as carbon ones, why does Earth have 300 times as many oxygen atoms as carbon?

As the comments suggest, there probably is no one factor, but a big one seems to be the gas and ice giants took most of the carbon away. In our Solar System as a whole, the primordial nebula had ...
Oscar Lanzi's user avatar
  • 3,826
3 votes
Accepted

How did "dust and gas" form into the Hadean Earth?

Very simply. No disrespect, but this is the type of explanation aimed at a young elementary/primary school child. It starts with hydrogen, helium and lithium . They've been around since the Big Bang. ...
Fred's user avatar
  • 24.7k
3 votes

When the Earth was hit by a meteor in Jurassic era, did it change its orbit or not?

Undetectably. The mass of the Chicxulub impactor is estimated at about $m_1=10^{13} \ kg$. The Earth's mass is nearly $m_2=6 \cdot 10^{24}\ kg$, while their velocities were similar (same order of ...
DrGC's user avatar
  • 1,753
2 votes

When the Earth was hit by a meteor in Jurassic era, did it change its orbit or not?

Not by a lot. Meteors have only a tiny fraction of Earth's mass, so at entry velocities roughly equivalent to our own orbital speed around the Sun (which would be typical of meteors) there is only a ...
Oscar Lanzi's user avatar
  • 3,826
2 votes
Accepted

Impact Erosion Selectivity In Offloading Radioactive Material

All the original research paper is saying is that there might be less radioactive elements in the silicate Earth (crust + mantle) than previously thought. And if there had been more of those elements, ...
Jean-Marie Prival's user avatar
1 vote

Before the Great Oxygenation Event, where was the oxygen?

Someone (I've lost track of whom. Tl;dr.) is seriously underestimating the amount of reduced carbon in sediments. Having examined (and logged, and submitted to oil companies and government, hundreds ...
Rockdoctor's user avatar

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