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How traveling back in time is permitted by Einstein’s physics
How traveling back in time is permitted by Einstein’s physics
Traveling back in time is a staple of science fiction movies. But according to Einstein, it’s a physical possibility that’s truly allowed.
Ethan Siegel
Jun 27
Astronomy’s secret weapon in the resolution wars: interferometry
Astronomy’s secret weapon in the resolution wars: interferometry
The sharpest optical images, for now, come from the Hubble Space Telescope. A ground-based technique can make images over 100 times…
Ethan Siegel
Jun 26
The one reason that physicists won’t give up on supersymmetry
The one reason that physicists won’t give up on supersymmetry
Almost 100 years ago, an asymmetric pathology led Dirac to postulate the positron. A similar pathology could lead us to supersymmetry.
Ethan Siegel
Jun 25
7 bizarre facts about the Solar System to stump any scientist
7 bizarre facts about the Solar System to stump any scientist
From the coldest planets to spacecraft that have exited the Solar System, these little-known facts stump even many professional…
Ethan Siegel
Jun 24
Ask Ethan: Is the Universe finite or infinite?
Ask Ethan: Is the Universe finite or infinite?
The Universe’s history, from cosmic inflation to the Big Bang to the present, is known. But whether it’s infinite or not is still a…
Ethan Siegel
Jun 21
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