Carbon Dioxide Snowfall on Mars?

NASA has ‘clear evidence’ of carbon dioxide snowfalls on Mars, the space agency revealed today – making this the only known example of carbon dioxide snow falling anywhere in our solar system.

Frozen carbon dioxide, better known as ‘dry ice’, requires temperatures of about -125C (-193F) which is much colder than needed for freezing water.

Ancient Aliens Debunked

Ancient Aliens Debunked is a 3 hour refutation of the theories proposed on the History Channel series Ancient Aliens. It is essentially a point by point critique of the ‘ancient astronaut theory’ which has been proposed by people like Erich von Däniken and Zecharia Sitchin as well as many others.

Fire Tornadoes

The so called fire tornado or fire whirls generally form when superheated air near the surface of a large fire zone rises rapidly in an airmass where sufficient horizontal or vertical vorticity (spin in the atmosphere) is also present. Much like a dust devil or whirlwind, the rapidly rising air above a wildfire can accelerate and turn the local vorticity into a tight vertical vortex, now composed of fire instead of dust.