Plato, the Greek philosopher who lived in the 5th century B.C.E., believed that the universe was made of five types of matter: earth, air, fire, water, and cosmos.

When someone mentions "different dimensions," we tend to think of things like parallel universes – alternate realities that exist parallel to our own, but where things work or happened differently.

In most places in the universe, this fifth dimension would not affect matter, but under the extreme gravity conditions inside Cygnus X-3 it could cause other types of quark to behave like strange ...

So, Earth's orbit only has a relatively tiny deviation from perfect circularity. But why is it so often shown as practically an egg shape? And how can we visualize the real situation?