Speed of light

[Bread_of_Life]

Correct, the sun moves around the Earth..to us. Indeed, you are the centre of the universe...to you. When you are seated on a moving train, it is not you or the train that is moving, but in fact, the rest of the Earth, and indeed Universe, moving around you and the train, but again, it is only moving like that to you (and other seated passengers). Next time your on a train, look out the window, observable fact shows this; things a moving outside of the train, as you can see, things inside appear to be remaining still.

Correct. However, we can tell which is really moving and which not, solving the twin paradox. But more on that later.

WRONG, both of you. OM you are talking about perception, not fact. You perceive the world outside the train to be moving while you are stationary but the truth is that both are moving.

Correct, but how can you tell which one is *really* moving? It's not as easy as you'd think, given Einstein's theory of special relativity. Serious, it aint.

WSB is just being silly because it is a fact that the Earth is orbiting the Sun. The Moon is orbiting the Earth, the Earth is orbiting the Sun, the Sun is orbiting the center of our galaxy which is moving through the universe. This is observable fact.

Correct, thank goodness for science.

Err, no, check out Einstein's Theory of Relativity. Everything is moving relative to the observer. Newtonian physics is just outdated.

Not quite - some things really are moving, and some not - otherwise the Twin Paradox would be insoluble. But you're nearly there.

[Edit: Also, the moon is moving in a straight line, as is the earth, as is the sun, but gravity distorts space time so it appears to be moving in a circular motion. However, as with all physics, this is all conjecture...]

Well, the first half of the sentence is true - but the last half isn't - physics like any other science is based on observation and successful predictions for theory choice. That means we get some very good theories - like general relativity.

The Cambrian is the last stratum of the descending levels that has any fossils in it. All the lower strata below the Cambrian have absolutely no fossil record of life other than some single-celled types such as bacteria and algae.

oops! Wrong. The pre-cambrian strata do have multicellular life, in fact, quite complex soft bodied organisms are found - just not nearly as many as in the cambrian.

That's because the Cambrian saw the advent of hard parts, which caused 2 things. Firstly, a lot more fossilisation. Secondly, an adaptive radiation of forms. It's not really that big a mystery.