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.
As time goes on, every galaxy beyond our local group will speed away from us faster and faster. And yet, more will keep appearing. The farther away a galaxy is […]
After the Big Bang, merging supermassive black holes are unparalleled. Here’s how we’ll find the first one. Last week, NASA’s Chandra X-ray observatory made history by announcing the most energetic explosive […]
A black hole punched a hole 15 Milky Ways across in a galaxy cluster’s gas, by far the largest ‘kaboom’ ever seen. The Universe, everywhere we look, is full of cataclysmic […]
Not everything needs a medium to travel through. If we can overcome that assumption, we don’t need the aether at all. All throughout the Universe, different types of signals propagate. Some […]
It’s not a lack of motivation, intelligence, or capability. Here’s how to open a space. Over the past 20 years, the number of bachelor’s degrees awarded in physics has more than […]
It isn’t just a day that comes every four years; it’s everything we need to keep our calendar aligned with Earth’s orbit. Once every four years, at least under most circumstances, […]
Ever wonder, exactly, how stars form from molecular gas and dust? So do scientists. One of the great challenges for astronomy is to determine, in gory detail, how stars are […]
Few scientific ideas have been as polarizing as string theory. There are good reasons to both love it and hate it. String theory is perhaps the most controversial big idea in […]
There are three possible ways we’ll find alien life. With all of these chances, the only question is which will come first. Given everything humanity has learned about the Universe, it […]
It’s one of only five spacecraft that will exit the Solar System, and the only one we have a chance to aim at another star. Of all the spacecraft ever launched, […]
If all forms of energy experience gravitation, then why does dark energy make the expansion accelerate instead of slow down? Of all the revolutionary discoveries that we’ve made about the Universe, […]
Sure, cosmic inflation has its detractors. But it also has something no alternative possesses: predictions and tests. Perhaps the most compelling part of any remarkable story is its origin: how it […]
Despite its changing shape and its unprecedented dimming, a supernova this year, decade, or even century is highly unlikely. For months, skywatchers have enjoyed a view of the night sky […]
With tens of thousands of satellites requiring AI-control to avoid collisions, a single solar flare could everything. Over the next few years, the night sky and the volume of space […]
A fascinating new book tells the untold stories of two women, Jackie Cochran and Jerrie Cobb, who could have been first. On June 18, 1983, the Space Shuttle Challenger launched with […]
One of NASA’s original great observatories, Spitzer showed us the infrared Universe as never before. On January 30, 2020, NASA’s Spitzer Space Telescope was retired after a 17 year mission. Prior […]
Black hole mergers are some of the most energetic events in the Universe. Could the gravitational waves they produce ever harm us? The Universe is not a static, stable place. Out […]
It really is the ‘glue’ that holds the Universe together, enabling structures like our own galaxy to form in the first place. One of the most puzzling and counterintuitive facts about […]
Scientific surprises are often how science advances. But more often than not, they’re just bad science. When you’re a scientist, getting an unexpected result can be a double-edged sword. The best […]
And how cutting just $1 billion per year in funding from NASA’s budget would be a catastrophe for science. When you think of the great cosmic beyond and what we know […]
Only one dark matter detection experiment ever gave a positive result, in conflict with all the others. This could be why. For multiple generations now, it’s been apparent to astronomers that […]
We’ve come fantastically far in our understanding of the distant Universe. Here’s how we’ll go even farther. Sometime in 2021, NASA’s James Webb Space Telescope will launch, deploy, and begin science […]
The Sun will eventually become a red giant star, swallowing Mercury and Venus in the process. But what will happen to Earth? There are a few existential questions we can ask […]
It’s been called the biggest conundrum in all of cosmology, and recent measurements just add to the confusion. One of the most puzzling facts about the Universe is that different […]
For over 50 years, it’s been the scientifically accepted theory describing the origin of the Universe. It’s time we all learned its truths. The Universe we know today, filled with stars […]
Two of our biggest science-fiction dreams might not remain fiction for much longer. Here’s how 21st-century science could make it real. For as long as human beings have looked up at […]
If galaxies are cities in the Universe, how unfortunate that our ‘cosmic country’ is dissolving. On the largest cosmic scales of all, planet Earth appears to be anything but special. […]
The center of the galaxy is mostly obscure in visible light. But thanks to the world’s most powerful infrared telescope, we can see inside. Throughout history, the sight of the Milky […]
The highest-energy particles on Earth reach enormous energies, but it’s nothing compared to what the Universe can achieve. Deep underground in Europe, the world’s most powerful particle accelerator lives in a […]
A fascinating podcast on the topic with NASA scientist Dr. Jessie Christiansen. How many planets are out there in the Universe? How many stars have planets, and what kinds of […]