In this video I explain the different entries on the Iceberg chart about the Universe.
Universe Iceberg chart: https://www.reddit.com/user/QuablYT/comments/lvddvl/the_universe_iceberg_chart/
Yes, i will admit that a lot of the last entries are more about Quantum Mechanics than the universe / space.

Here is a list of the topics I will get into. You can skip around if you don’t want to see the whole video:
Timestamps:
0:00 - Intro
0:16 - Stars (Level 1)
0:46 - Galaxies (Level 1)
1:01 - The Big Bang (Level 1)
1:18 - Gravity (Level 1)
1:41 - The speed of light (Level 1)
2:08 - The observable universe (Level 1)
2:30 - The expansion of the universe (Level 1)
3:23 - Atoms (Level 1)
3:51 - Subatomic particles (Level 2)
4:17 - Black holes (Level 2)
5:36 - Neutron stars (Level 2)
5:55 - Trans-Neptunian objects (Level 2)
6:23 - The theory of relativity (Level 2)
7:46 - Dark matter (Level 2)
8:32 - Dark energy (Level 2)
8:51 - Antimatter (Level 3)
10:57 - Worm holes (Level 3)
11:58 - Cosmological epochs (Level 3)
13:11…