Sentences with phrase «by meteorites since»

Not exact matches

The evidence for life in the Martian meteorite has since been dismissed by many experts, and even if there are signs of life somewhere on Mars, the chances of a craft like the Polar Lander finding it are slim.

The Cool Stars 18 Public Lecture is sponsored by The Barringer Crater Company, owners since 1903 of The Barringer Meteorite Crater more commonly known as Meteor Crater, Earth's first proven and best preserved impact site.

Since the hole was spotted in mid-July by a helicopter pilot, conjecture has abounded about how the 30 - metre - wide crater was formed — a gas or missile explosion, a meteorite impact and alien involvement have all been suggested.

The warming since 1850 has always been due to known external forcing (the sun) modified by known internal forcing (some big volcanoes, a Siberian meteorite and a minor CO2 rise) and to unknown internal forcing (mainly cloud formation and albedo changes, perhaps some particulates in the air) otherwise known as natural variation.