Best quote from Black Holes and the Dark Universe: Decoding Dark Matter and GW190728
The stars, the planets, and the glowing gas of nebulae make up a mere five percent of the universe; the rest is a deep, silent mystery that scientists call dark matter and dark energy.
This audio lesson was created by a BeFreed community member
An exploration of cosmic mysteries focusing on black holes and dark matter, covering their properties, discovery, and what they reveal about the universe.
Frequently Asked Questions
GW190728 is a gravitational wave event detected on July 28, 2019, caused by two black holes colliding billions of light-years away. It is significant because the signal differed from theoretical expectations of a merger in a vacuum. Physicists believe the ripple carries a ghostly imprint suggesting the black holes plowed through a dense cloud of dark matter, providing a rare opportunity to study this invisible substance.
While stars and planets make up only five percent of the universe, the rest consists of mysterious dark matter and dark energy. Black holes serve as powerful tools for making this invisible majority visible by acting as natural particle accelerators. By observing how black hole mergers are affected by their surroundings, researchers can better understand the dark matter that helps architect the structure of the universe.
Scientists are using advanced instruments like the James Webb Space Telescope and gravitational-wave detectors such as LIGO to end the 'dark ages' of cosmology. These technologies allow researchers to detect ripples in space-time and observe distant cosmic structures. Together, these tools reveal that black holes and dark matter are not just isolated curiosities but are fundamental components that shape everything we see in the night sky.
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From Columbia University alumni built in San Francisco
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
"Instead of endless scrolling, I just hit play on BeFreed. It saves me so much time."
"I never knew where to start with nonfiction—BeFreed’s book lists turned into podcasts gave me a clear path."
"Perfect balance between learning and entertainment. Finished ‘Thinking, Fast and Slow’ on my commute this week."
"Crazy how much I learned while walking the dog. BeFreed = small habits → big gains."
"Reading used to feel like a chore. Now it’s just part of my lifestyle."
"Feels effortless compared to reading. I’ve finished 6 books this month already."
"BeFreed turned my guilty doomscrolling into something that feels productive and inspiring."
"BeFreed turned my commute into learning time. 20-min podcasts are perfect for finishing books I never had time for."
"BeFreed replaced my podcast queue. Imagine Spotify for books — that’s it. 🙌"
"It is great for me to learn something from the book without reading it."
"The themed book list podcasts help me connect ideas across authors—like a guided audio journey."
"Makes me feel smarter every time before going to work"
