Every one knows how the snow lies in the valleys of the Alps, forming a plain which slopes gradually downward towards the outlet Imagine such a... →
Edward Burnett Tylor
If your ego starts out, 'I am important, I am big, I am special,' you're in for some disappointments when you look around at what... →
Neil deGrasse Tyson
Perhaps we've never been visited by aliens because they have looked upon Earth and decided there's no sign of intelligent life.
Philosophically, the universe has really never made things in ones. The Earth is special and everything else is different? No, we've got seven... →
If you get asteroids about a kilometer in size, those are large enough and carry enough energy into our system to disrupt transportation... →
Darwin's theory of evolution is a framework by which we understand the diversity of life on Earth. But there is no equation sitting there in... →
If you slid Pluto to where Earth is right now, heat from the sun would evaporate that ice, and it would grow a tail. Now that's no kind of... →
Mars once was wet and fertile. It's now bone dry. Something bad happened on Mars. I want to know what happened on Mars so that we may prevent it... →
If Mars formed life, then life on Earth could have been seeded by life on Mars, making every life form on Earth descended from Martians.
Where there's water on Earth, you find life as we know it. So if you find water somewhere else, it becomes a remarkable draw to look closer to... →