I've got a good one:
Dhusk at CBR wrote:Holy crap, you're insane.
100 teratons = 100 TRILLION tons of TNT. That level explosion would have cracked the entire planet in two, not just created a 300 mile-wide crater off the Yucatan.
The 4 to 6 gigaton explosive range of the K-T impact has been calculated by actual RL scientists and experts in their field who have studied the phenomenon for decades and ran simulations on billion-dollar supercomputers. They were not rabid warsies with pocket calculators and bad science assumptions, so I'll take their word for it, not yours.
Claims like this are quite common. I'd say that a response to it should include not only explanations of what gigaton-teraton level energies really do on a planetary scale, but also quotes from "actual RL scientists and experts in their field" like these:
There are three in
this PDF.
On the formation of Argyre Planitia:
The total energy in the impact is calculated in ~ 1.56E33 Ergs, i.e., ~ 37,085 millions of Megatons.
and the formation of Isidis Planitia:
The total energy in the impact is calculated in ~ 2.78E33 Ergs, i.e., ~66,110 millions of megatons.
on Chicxulub:
The total energy in the impact is calculated in ~ 1.2E30 Ergs, i.e., ~ 571 millions of Hiroshima.
and
this page, which gives a range of 160 to 800 teratons for Chicxulub:
The crater size, meteoritic content of the K/T boundary clay, and impact models indicate that the Chicxulub crater was formed by a short period comet or an asteroid impact that released 0.7-3.4×10^31 ergs of energy.
I especially like the Martian craters since they are not only larger than Chicxulub, but they occured on a smaller planet. Much more damning. I just wish I could find something about Hellas Planitia.