Another way one could argue that the universe has no beginning is if it is shaped in a funny, non-Euclidian way so that the matter and energy loops back on itself due to the curvature of space. Not all non-Euclidian shapes for space would allow it to do this, but some might.
Fortunately, scientists now have evidence that the universe is not curved. It is Euclidian or “flat” in the argot of astronomy. This was shown a few years ago by examining gigantic structures in the night sky that are too faint for the human eye to see.
That’s what the picture on the left is. It’s a section of the southern sky (think: Australia, not Dixie) showing enormous structures that we could see if our eyes were sensitive to the right frequency. To give a sense of how big these structures are, the dot that is inset in the picture is the relative size of the moon. Since the structures themselves are ultra-far away, though, they’re FREAKING HUGE.
They also contain clues about the geometry of the universe, and they reveal it to be Euclidian. So all that stuff Carl Sagan told you in Cosmos about the universe maybe being a weird shape appears to be simply wrong.
This also means that you couldn’t stand up on a high hill, use a pair of superpowerful binoculars, look out across the universe, and see the back of your own head. They may have done that in a way cool Land of the Lost episode, but that was their universe, not ours.
Today’s rare transit of the sun by Venus gave scientists the world over the chance to directly observe the size of the two bodies in relation to each other.
A German scientist named Dr. Rainer Kuehne believes