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Ethan Siegel
A theoretical astrophysicist and science writer, host of popular podcast “Starts with a Bang!”
Ethan Siegel is a Ph.D. astrophysicist and author of "Starts with a Bang!" He is a science communicator, who professes physics and astronomy at various colleges. He has won numerous awards for science writing since 2008 for his blog, including the award for best science blog by the Institute of Physics. His two books "Treknology: The Science of Star Trek from Tricorders to Warp Drive" and "Beyond the Galaxy: How humanity looked beyond our Milky Way and discovered the entire Universe" are available for purchase at Amazon. Follow him on Twitter @startswithabang.
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Can two planets stably share the same orbit? Conventional wisdom says no, but a look at Saturn's moons might tell a different story.
All stars, eventually, run out of fuel and die. Given all the stars we can see and the vast distance to them, are any of them already dead?
Over 50 years since humans last walked on the Moon, astronaut footprints and rover tracks are still visible. But they won't last forever.
Today, our observable Universe extends for 46 billion light-years in all directions. But early on in our history, things were much smaller.
The giant impact theory suggests our Moon was formed from proto-Earth getting a Mars-sized strike. An exoplanet system shows it's plausible.
For many years, cosmologists have claimed the Universe is 13.8 billion years old. A new paper says no, it's 26.7 billion. How do we decide?
If you've found yourself befuddled by extraordinary scientific-sounding claims, you're not alone. But this centuries-old lesson can help.