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Does dark matter interact non-gravitationally at all?
Does dark matter interact non-gravitationally at all?
In theory, dark matter is cold, collisionless, and only interacts via gravity. What we see in ultra-diffuse galaxies indicates otherwise.
Ethan Siegel
Oct 8
Fastest spacecraft ever built to break its own speed record
Fastest spacecraft ever built to break its own speed record
The Parker Solar Probe is about to undergo its seventh encounter with Venus on its journey towards the Sun. Here’s how fast it’ll go.
Ethan Siegel
Oct 7
Ask Ethan: Is Earth the center of the Universe?
Ask Ethan: Is Earth the center of the Universe?
In all directions, at great distances, the Universe looks younger, more uniform, and less evolved. Does that mean Earth must be the center?
Ethan Siegel
Oct 4
Your head lives a longer life than your feet do
Your head lives a longer life than your feet do
Time is relative, not absolute, as gravity and motion both cause time to dilate. Your head and feet, therefore, don’t age at the same rate.
Ethan Siegel
Oct 3
Why hasn’t JWST broken the cosmic distance record by more?
Why hasn’t JWST broken the cosmic distance record by more?
Despite many ultra-distant galaxy candidates found with JWST, we still haven’t seen anything from the Universe’s first 250 million years.
Ethan Siegel
Oct 2
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