Earth is pretty good at supporting life, but according to a new estimate of what constitues a planetary "habitable zone," it looks like our planet (and perhaps many others) is only barely in the right place.
It's an enduring puzzle that's had astronomers and astrophysicists scratching their heads for years: Why does the Earth tilt? Our planet orbits with at slight (7-degree) angle relative to the Sun, and we've never been able to figure out why, but now one scientist thinks he's got our planet's crooked spin solved.
Over the past year, astronauts have been snapping shots of the Earth from the window of the International Space Station (ISS). The result? This stunning time-lapse video showing our beautiful planet as only a few get to see it.
First we learn that the moon isn't from where we thought it was from, now the Earth's origins are being called into question. After years of following the same model for how our planet was formed, some researchers now think they have a new explanation for how Earth got here, and why it's drier than it should be.