BBC Horizon 2008: 1/5 What on Earth is Wrong with Gravity

[schwarzfalk]

this guy's supposed to be 40 in this vid yet he looks like he's fresh outa college...WTF???

[paigerocks884]

hey,he's just happy about physics!

[ALPHADESIGNTAMPICO]

si tengo 2 planetas separados uno mas grande que el otro y coloco un asteroide justo en medio de los 2 hacia donde se ira el asteroide?!

[beatboxpeej]

@ALPHADESIGNTAMPICO It depends on the mass of the two planets, the velocity of the asteroid (if any) and the motions of the planets. Assuming absolute equality of the masses, no motions at all of all 3 bodies..then nothing will ever move. You would put a sheet of paper on a side of the asteroid and it would move towards the opposite side.

Yo no hable espanol..but I speak french and french is close enough I could understand most of your question

[ALPHADESIGNTAMPICO]

@beatboxpeej Thanks! But assuming that one planet is bigger than the other and no one of the 3 objects is moving, what should happen?

[beatboxpeej]

@ALPHADESIGNTAMPICO the asteroid will be attracted by the biggest planet since it has more mass and gravity makes objects (and even energy) move toward the biggest object since it's influence is greater. The only exception would be if the asteroid is closer to the smaller planet. Gravity has greater effects on objects when you are getting closer to the "source" of gravity.

[callawaydekluizen]

@ALPHADESIGNTAMPICO not possible, everything is moving you can never have a "freeze"

[ALPHADESIGNTAMPICO]

@callawaydekluizen Hipoteticaly situation. Just to understand how gravity would work.

[callawaydekluizen]

@ALPHADESIGNTAMPICO look at it like this. take a large towel and hold it with 2 people on each side in the air so the towel is horizontal. The towel is your 'spacetime'. Now put a mass in the middle of the tower. If the mass is heavy enough the towel will show a dent because of the weight. This is the curving and bending of spacetime. Now try to roll a ball in a straight line past the object in the middle. You see that the ball 'folows' the curves and this circles around the object in the middle

[callawaydekluizen]

@ALPHADESIGNTAMPICO the ball moves in a straight line but because he is folowing that curve he makes circles. That s your attraction. If the speed of the ball is fast enough to break through the curvs, it keeps going at a straight line, hope that helps you visuallizing it :)

[9496728007]

This man looks like justin bieber

[designandsketch]

there is something about this guy irritates me. but i can't precisely tell. seems and acts fake to me.. not like jim khalili.. sorry:(

[Gafaton]

@designandsketch It's not that he's being fake. He is attempting to explain extremely difficult concepts to the lay person. Accomplishing this requires him to speak slowly and deliberately.

[sockington1]

@designandsketch i agree - I'm not doubting his intelligence, it's just his annoying grin that gets on my nerves

[tiestoboi]

*SiGh...*

Beauty & Brains.... A rare combination. :D

[shinystarlet]

It's fascinanting how he is always so enthusastic, he preaches science like a priest would preach his religion :D

[jamesarongray]

the bigger mystery is this.... is this guys head real or made of rubber?

[farhan86a]

@jamesarongray lol

[1977fiero]

is it just me or does he look a little like cillian murphy

[EvoPortal]

Brian Cox is a great host.

[tomsweisiong]

thx for iploading

[iksahir]

i love his accent...same like cheryl cole... is he from ireland?

[andytillott]

@iksahir Brian Cox and Cheryl Cole are both from the North of England.

[iksahir]

@andytillott Thank you :-)

[SeaneeDeee]

@iksahir He's from Manchester