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### Science and Astronomy Videos

Posted: 09 Mar 2017 23:52

Another excellent presentation at CfA which was given earlier today, and a topic relevant to much of what JWST will be looking at -- the first stars and galaxies.

The speaker has a pretty lengthy introduction, so to skip to the talk it starts at about 5:20.

### Science and Astronomy Videos

Posted: 15 Mar 2017 07:12

### Science and Astronomy Videos

Posted: 16 Mar 2017 20:55
Someone was talking about time crystals earlier.  Here we go!

### Science and Astronomy Videos

Posted: 17 Mar 2017 05:17
Now I just need a way to work them into my time machine, because clearly thats how it works, so I can go back in time and reverse entropy.

### Science and Astronomy Videos

Posted: 22 Mar 2017 17:01

### Science and Astronomy Videos

Posted: 22 Mar 2017 17:25

### Science and Astronomy Videos

Posted: 23 Mar 2017 06:13
DoctorOfSpace, nice video

### Science and Astronomy Videos

Posted: 25 Mar 2017 18:32
Hornblower wrote:
The problem is, as you accelerate past the speed of light, at the moment you are traveling at the speed of light, you will have traveled an infinite distance in an infinitely short period of time. Right? Therefore, you would have to be externally accelerated.

Right, in the sense that this is one way in which you can think of why this scenario is not possible.  When you reach the speed of light, you are traveling an infinite distance in zero proper time -- meaning that from your point of view, you travel infinitely far instantly, and to an external observer (not going at the speed of light), your clock is no longer ticking.  How can you accelerate, if in your frame of reference you do not experience time?  What does acceleration even mean if you experience no time?

Actually, it's even worse than that, because being accelerated externally does not work either.  How can you accelerate something externally if all possible signals and interactions which could cause further acceleration are moving at the same speed or slower than the thing you're trying to accelerate?

### Science and Astronomy Videos

Posted: 26 Mar 2017 01:53

### Science and Astronomy Videos

Posted: 29 Mar 2017 19:12

### Science and Astronomy Videos

Posted: 30 Mar 2017 08:14

### Science and Astronomy Videos

Posted: 01 Apr 2017 06:05
Faster than Light Travel Achieved! | Space Time

(and happy April fools day)

### Science and Astronomy Videos

Posted: 01 Apr 2017 08:23

### Science and Astronomy Videos

Posted: 04 Apr 2017 17:15

The CGI looks very similar and the music is similar, I wonder if this is by the same guy who did

### Science and Astronomy Videos

Posted: 04 Apr 2017 19:22
A beautiful end for a beautiful mission.