What sci-fi concepts are actually scientifically possible?

[ashishsinghal]

Hey,
I have been quite curious about science fictions. Now, I want to start a thread for possibilities or impossibilities of various stuff in science fictions. So, let's get it started.

My first one is this :

 

[JaredJames]

Well we already have a few threads like this.

I'll try and dig the links out, but they cover the science of movies - which bits suck and which bits work (the latter was somewhat lacking in content).

EDIT: https://www.physicsforums.com/showthread.php?t=320045&highlight and (can't find the second one).

 

[nismaratwork]

"I find that, as a general rule of thumb, if you ever think one of Newtons laws is wrong, don't tell anyone."



That is priceless!


@Ashishsinghal: If you can mention specific elements of a given bit of sci-fi that you want to know about (lasers, Phasers, beaming, FTL, wormholes etc) it's much easier to answer specific questions.