The Universe: Nemesis - The Sun's Evil Twin

00:00:00 In the beginning, there was darkness, and then-- Bang--

00:02:17 years ago was because a comet slammed into the Earth.

00:04:19 If this star is discovered, it is so important.

00:06:11 for the survivors to flourish and evolve...

00:08:06 But one of the things it can do is put them on an orbit that

00:09:21 They're making an "X" in the air.

00:11:00 deadly companion star to the Sun, he believes he knows

00:12:52 For many people the idea that Earth has been

00:14:37 Yes, it's orbiting us, but that orbit is very slow-- 26-million years.

00:16:50 times more mass than its undiscovered twin.

00:18:41 And so far, that search has led to an astounding new theory.

00:20:40 temperature of space.

00:22:09 Bring your left foot up in there.

00:23:19 And you'll notice there's several different hot areas of the vehicle.

00:25:03 But in the next few years, we expect the theory will be either

00:27:23 They'd be very regular in their arrival times and departure times.

00:29:18 In astronomy, we frequently infer the existence of something, not because we can

00:31:26 beneath the cloud tops.

00:33:29 At its nearest point, Sedna lies about three times farther away

00:35:17 You move away from the Sun, you come back towards the Sun.

00:37:21 and we get these very elliptical orbits, we need to get more

00:39:19 The Solar System probably formed in a cluster of stars

00:41:13 Nemesis simply shuffles some comets out of its way.

00:43:14 out, no one can know for sure.