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How we know the Universe is 13.8 billion years old
How we know the Universe is 13.8 billion years old
The Universe is 13.8 billion years old, going back to the hot Big Bang. But was that truly the beginning, and is that truly its age?
Ethan Siegel
Apr 15
Starts With A Bang podcast #104 — The magnetized galactic center
Starts With A Bang podcast #104 — The magnetized galactic center
The center of the galaxy doesn’t just host stars and a black hole, but an enormous set of rich gassy and dusty features. Find out more!
Ethan Siegel
Apr 13
What was it like when human beings transformed the Earth?
What was it like when human beings transformed the Earth?
Although human beings arrived on Earth just ~300,000 years ago, we’ve transformed the entire planet completely. Here’s how we did it.
Ethan Siegel
Apr 12
What was it like when humans first arose on planet Earth?
What was it like when humans first arose on planet Earth?
Despite billions of years of life on Earth, humans first arose only ~300,000 years ago. It took all that time to make our arrival possible.
Ethan Siegel
Apr 11
What was it like when mammals appeared and thrived?
What was it like when mammals appeared and thrived?
Although mammals may be the dominant form of life today, we’re relative newcomers on planet Earth. Here’s our place in natural history.
Ethan Siegel
Apr 10
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