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.
If dark matter exists in a large halo in our galaxy, made up of particles, then it's passing through us constantly. But how much?
There's a limit to how large planets can be, and it's only about double the radius of Jupiter. At least, so far.
The Big Bang was hot, dense, uniform, and filled with matter and energy. Before that? There was nothing. Here's how that's possible.
More than any other of Einstein's equations, E = mc² is the most recognizable to people. But what does it all mean?
Despite being the closest planet to the Sun, Mercury "only" reaches 800 °F at its hottest. Venus is always hotter, even at night.
Professional astronomy images are the gold standard. But this Large Magellanic Cloud composite is the amateur community's best image ever.
Is the multiverse real? It's one of the hottest questions in all of theoretical physics. We invited two astrophysicists to join the debate.
The natural wonders of Mauritius include the spectacular sight of an underwater waterfall. Here's the science of how it works.
Out of all the galaxies we know, only a few little ones are missing dark matter. At last, we finally understand why.
Move over, IC 1101. You may be impressively large, but you never stood a chance against the largest known galaxy: Alcyoneus.
Once science operations begin for James Webb, we'll never look at the Universe the same way again. Here's what everyone should know.
Lake Baikal holds nearly one-fourth of Earth's fresh surface water and is the most scientifically interesting lake on our planet.
With 1550 distinct type Ia supernovae measured across ~10 billion years of cosmic time, the Pantheon+ data set reveals our Universe.
65 million years ago, an asteroid strike caused the 5th great mass extinction. Could we save Earth, today, from a similar event?
The ANITA experiment found cosmic rays shooting out of Antarctica. One interpretation claims "parallel Universes," but is that right?
As viewed by the MeerKAT telescope, this radio view of the Milky Way blows away every other way we've ever seen our home galaxy.
There really might be extraterrestrials out there, attempting to make contact. Here's how science, not fiction, is attempting to find them.
With launch costs dropping and enormous numbers of new satellites filling the sky, can't we just do it all from space?
Travel half the distance to your destination, and there's always another half to go. Despite Zeno's Paradox, you always arrive right on time.
The Universe is supposed to be the same everywhere and in all directions. So what's that giant "cold spot" doing out there?
Just 12 million light-years away, the galaxies Messier 81 and 82 offer a nearby preview of the Milky Way-Andromeda merger.