In Cosmos, The Only Thing More Important Than Evidence Is Imagination

The universe, they say, isn't just stranger than we imagine. It's stranger than we can imagine. After three episodes focused on matters solar and mundane, from the evolution of life to the orbital dynamics of comets in our little flat circle of spacetime, episode four tackles the limits of cosmic reality far beyond… » 3/31/14 9:20am 3/31/14 9:20am

Is time real?

It's more than some half-baked question from your college days. Time and its "real"-ness are, in fact, major considerations in fields like physics and philosophy. But then, what does that question – Is time real? – even mean? Theoretical physicist Sean Carroll gets down to brass tacks on time, reality, and how we… » 10/17/13 1:08pm 10/17/13 1:08pm

We Can Make It to the Edge of the Observable Universe in a Few Decades

Do you find our galaxy too confining? Do you long for the vast expanses of extragalactic space? Now, you can make it to the edges of the observable universe in only a few decades! In this week's "Ask a Physicist," we'll offer you a practical guide for the intergalactic traveler. » 6/20/13 11:00am 6/20/13 11:00am

How you depend on relativity every day, without knowing it

Special and general relativity help us see time, space, and energy in strange new ways. That strangeness seems to remove the theories from our everyday experience. Despite their exotic appeal, Einstein's famous theories are part of our everyday life. Find out how you depend on special and general relativity to find… » 11/18/11 11:46am 11/18/11 11:46am