Electrons In Camera

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The 70 km/s/Mpc means that for every Mpc away the galaxy is from where you stand, its speed increases by 70km per second, so one 100 Mpc away would seem to you to be moving away from you at 7000km/s. Someone in a galaxy further away from that galaxy would measure the speed as higher and someone in a galaxy closer to it would measure it as slower. It’s just like with the seats in the movie theatre analogy I used, it is all relative to the position of the observer.

As for the hydrogen atom, if it were moving at 70km/s it would hit with a force of 0.000000000000000000001162 Newtons, so not much of a whack or a thud there! the Mpc bit is obviously not relevent to a hydrogen atom, as it is a measure of distance.
 
Thanks v much. Can I ask one more.
If two hydrogen atoms were tied together by a cable 100 km long and both were traveling away from each other at 70km/s. What force would you find at an imaginary point on the cable half way between the two atoms?
 
You said:
Thanks v much. Can I ask one more.
If two hydrogen atoms were tied together by a cable 100 km long and both were traveling away from each other at 70km/s. What force would you find at an imaginary point on the cable half way between the two atoms?
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It’s a little difficult to answer that, as the cable would be much heavier than the hydrogen atoms. The cable itself would be made of many more atoms and those atoms would be heavier than a hydrogen atom.
 
starsmurf said:
It’s a little difficult to answer that, as the cable would be much heavier than the hydrogen atoms. The cable itself would be made of many more atoms and those atoms would be heavier than a hydrogen atom.
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Right. The cable is imaginary. Its just the amount of force two hydrogen atoms could exert on an imaginary median point at that speed if they were joined to the median point by an imaginary line.
 
Each hydrogen atom would exert the same amount of force as in the previous example, 0.000000000000000000001162 Newtons. All that is different between a push and a pull is the direction, it doesn’t affect how much force is exerted.
 
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