Discover and read the best of Twitter Threads about #astropy
Most recents (1)
The statement that 95% of the Universe is "dark" or "unknown" can be quite misleading if not properly qualified. It actually applies only at very large length scales (way beyond the largest structures in the Universe), and at a specific time (now) 1/5 
In the local Universe things are different: in a sphere centered around the Sun and radius equal to the Earth's orbit, the Universe is ~100% ordinary matter. In a sphere surrounding our Galaxy, the dominant component is dark matter, while dark energy is irrelevant👇2/5
Then there's time dependence: the contribution of dark matter and dark energy varied enormously during the history of the Universe, going from irrelevant right after the Big Bang to the current ~95% 3/5
