Could There Be Another Planet Behind The Sun?

Universe Today's Fraser Cain nails it in just five words: "No. Nooooo. No. Just no." But then he explains how we know this, and what would happen if a planet were to suddenly materialize, in an orbital position hidden from our view by the Sun. » 2/24/15 12:30pm 2/24/15 12:30pm

What Time is It in the Universe?

Check your watch. What time is it? But wait, you've actually been moving and accelerating, and according to Einstein, everything's relative. So what time is it really? It all depends… » 8/30/14 9:00am 8/30/14 9:00am

Is Our Solar System Unique In The Universe?

How special is our solar system? Is our sun unique? What about the number, arrangement, and composition of our planets – are they weird, or what astronomers expect to see? Is our planetary neighborhood "normal"? Perhaps more importantly, is there even such a thing as "normal," at the scale of the universe? » 7/17/14 9:20am 7/17/14 9:20am

Why Is Everything Spherical?

Have you ever noticed that everything in space is a sphere? The Sun, the Earth, the Moon and the other planets and their moons… all spheres. Except for the stuff which isn't spheres. What's going on? » 6/28/14 8:30am 6/28/14 8:30am

How fast does the Earth rotate?

The answer, obviously, is really, really fast. Here, Universe Today's Fraser Cain tells us exactly how fast, and gives us answers to a few other things you may have wondered about before. For instance: how much lighter are you on a spinning Earth as opposed to a stationary one? » 5/22/13 8:20am 5/22/13 8:20am