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Remembering the fallen heroes of spaceflight

Remembering the fallen heroes of spaceflight

Memorial day is a time to remember veterans killed in the line of service. These spaceflight heroes deserve to be remembered, too.
Go to the profile of Ethan Siegel
Ethan Siegel
Ask Ethan: What is the Universe expanding into?

Ask Ethan: What is the Universe expanding into?

It’s been 100 years since we discovered that the Universe was expanding. But if it’s expanding, then what is it expanding into?
Go to the profile of Ethan Siegel
Ethan Siegel
5 “What ifs” that would’ve changed cosmic history

5 “What ifs” that would’ve changed cosmic history

If our Universe were born a little differently, there wouldn’t have been any planets, stars, galaxies, or chemically interesting reactions.
Go to the profile of Ethan Siegel
Ethan Siegel
Surprise: the Moon outshines the Sun at the highest energies

Surprise: the Moon outshines the Sun at the highest energies

Across all wavelengths of light, the Sun is brighter than the Moon. Until we went to the highest energies, and saw a gamma-ray surprise.
Go to the profile of Ethan Siegel
Ethan Siegel
Why Einstein’s E = mc² is only half of the equation

Why Einstein’s E = mc² is only half of the equation

Einstein’s most famous equation is E = mc², which describes the rest mass energy inherent to particles. But motion matters for energy, too.
Go to the profile of Ethan Siegel
Ethan Siegel
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