Discussion on:

Asteroid of doom - or maybe not

An 80 mile-wide asteroid would create something a bit larger than Meteor Crater. 80 meters, perhaps, but not miles.

One new K-T boundary candidate, the "Shiva crater" is estimated at 600 x 400 km in size, and is believed to have been created by a 40 km (25 mile) wide asteroid or comet.

Not sure about the exact scaling factors, but comparing the data from the Meteor Crater website (http://www.meteorcrater.com/) and the Shiva Crater Wiki, it seems relatively linear, with the crater being 15 times the diameter of the impactor. That would put the crater for an 80 mile wide asteroid at 1200 miles or, roughly, half the width of the continental U.S.

Ouch.

Slide 8: "It's about 1.2 km deep (about 3/4 of a mile)."

Er...nope. It's about 1.2 km WIDE (2.4 mile circumference - divided by Pi) and a little under 170 m (550 feet) deep. Just look at the road near the crater. That alone should put the scale of the crater in context.

Sounds like a candidate for a mars-orbit+ to near venus orbit cycler-habitat with 460ft of shielding/materials by 2040 at latest, it's just waiting for a cheap heavy lifter & a colonising/construction-crew to profitably exploit it to me, adjust orbit w/ e-sails & use as a slowfreight to mars & beyond + venus & in.

revelation 18 says new york will be hit by an asteroid