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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
After 13.8 billion years, why hasn’t the Big Bang faded away?
After 13.8 billion years, why hasn’t the Big Bang faded away?
Although the Big Bang occurred at an instant in time long ago, we still see the light from it. Will the evidence ever disappear completely?
Ethan Siegel
Jun 20
The Milky Way’s stars are gradually being ejected
The Milky Way’s stars are gradually being ejected
Known as hypervelocity stars, we originally thought just one would be ejected every 100,000 years. The real number is much greater.
Ethan Siegel
Jun 19
Astronomers near a complete picture for how planets form
Astronomers near a complete picture for how planets form
Newborn stars are surrounded only by a featureless disk. Debris disks persist for hundreds of millions of years. So when do planets form?
Ethan Siegel
Jun 18
RIP Apollo 8 astronaut Bill Anders, who rediscovered Earth
RIP Apollo 8 astronaut Bill Anders, who rediscovered Earth
In December of 1968, human beings made their first-ever journey to the Moon aboard Apollo 8. Their most important discovery? Planet Earth.
Ethan Siegel
Jun 17
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