Last week, we dealt with General Relativity (which is all about gravity). This week, we're looking at another theory from Einstein: Special Relativity (which does not include gravity).
This clip from Channel 4's wonderful comedy Father Ted actually explains the basics of Special Relativity quite nicely:
It's all about frames of reference. In the clip, Father Ted explains to Dougal that the toy cows in his hands are "small, but the ones out there are far away".
Special Relativity takes things one step further to include motion. It states that everything is moving relative to everything else.
Confused? Time to break out the Lego figures to help us explain.
Here's Ironman whizzing past Batman at a constant velocity of 750mph.
Ironman has no way to prove he's moving. It could be that Batman (and the Earth and everything on it) is moving backwards at 750 mph.
And under Special Relativity BOTH frames of reference are correct. It could be Ironman, it could be Batman moving at 750mph.
BUT this rule only applies under certain SPECIAL circumstances (hence, the name Special Relativity).
Ironman must be travelling at a constant velocity. In other words, he has to be travelling at the same speed and in a straight line.
If Ironman accelerates or changes direction, then Special Relativity no longer applies. But General Relativity does.
Special Relativity has many consequences for Ironman, Batman and our entire understanding of the universe:
We'll delve more into those three big scientific concepts soon.
Suggested Further Reading and Watching
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