Universe

Arrow of time

“Gedankenexperimenten”: We – traveling on the photon – observe nothing. The reference clock has stopped and the time axis of the photon is endless.

Rotating black hole with disk

The star is dead! Long live the star! From the old star a new is born, that emits its pulslike message to the end of our universe.

Big bang expansion

Our imagination is stretched to the utmost, not in fiction, but to comprehend things that are there.