How would you get to another planet? So far, we humans have never landed astronauts anywhere but the Moon.

It would take years to design and build spaceships capable of manned interplanetary travel, and each ship would probably only hold a few people. And by the time we found out that Earth was doomed for imminent destruction, it would be too late to build the ships.

Where would the ships be sent? Mars? Venus? Either destination would take several years of space flight to get there -- so the ships would have to hold enough food, water and air for years of travel for all of their crew.

Mars has an atmosphere but it’s not breathable -- its surface air pressure is less than 1% of the Earth's surface pressure -- and Mars' atmosphere is composed of 95% carbon dioxide, 3% nitrogen, 1.6% argon, with traces of oxygen and water. So humans settling on Mars would have to supply their own air, wear spacesuits outside, and build air-tight shelters.

Venus's atmosphere is composed mostly of carbon dioxide, with thick clouds of sulfuric acid completely covering the entire planet and preventing its surface from being seen in visible light. Its atmospheric pressure at the surface is 92 times that of Earth's -- a pressure equivalent to that at a depth of nearly 1 kilometer under Earth's oceans. The carbon dioxide-rich atmosphere, along with thick clouds of sulfur dioxide, generates the strongest greenhouse effect in the Solar System, creating surface temperatures of over 460 °C (860 °F). So Venus would be even less inhabitable than Mars.

So -- is it possible to live on either planet? Not without years of construction and preparation, and even then, only a handful of people would be able to travel there and live. If the Earth were going to be destroyed, I'm afraid the human race would be,