``In astrophysics and cosmology, dark matter is a hypothetical form of matter of unknown composition that does not emit or reflect enough electromagnetic radiation to be observed directly, but whose presence can be inferred from gravitational effects on visible matter.´´
it doesnt say ``doesnt emit ANY radiation´´, it says ``doesnt emit ENOUGH radiation to be observed DIRECTLY´´ ;) so planets are dark matter.
i really hate it when they mix up dark energy and dark matter in such a way, and when they try to make dark matter look somehow mysterious.
not a good educational video, i think it spreads more misconceptions than it manages to answer.
and there are factual errors, they said that planets are not dark matter, and thats just plain wrong. black holes, dust that doesnt glow, planets, asteroids, all that is dark matter. nothing mysterious about it.
wow we are so small...
Beatmastapat09 3 years ago
Thanks for the video and summary in ur blog. Have a nice Sunday Stephen. :)
KyotoMelody 4 years ago
look it up on wikipedia.
``In astrophysics and cosmology, dark matter is a hypothetical form of matter of unknown composition that does not emit or reflect enough electromagnetic radiation to be observed directly, but whose presence can be inferred from gravitational effects on visible matter.´´
it doesnt say ``doesnt emit ANY radiation´´, it says ``doesnt emit ENOUGH radiation to be observed DIRECTLY´´ ;) so planets are dark matter.
kurtilein3 4 years ago
shut upyelruyi
pufixas 2 years ago
Great video, thank you for putting it up!
nanogirl 4 years ago
Is there a sort of Brownian motion with dark matter?
superfisto 4 years ago
i really hate it when they mix up dark energy and dark matter in such a way, and when they try to make dark matter look somehow mysterious.
not a good educational video, i think it spreads more misconceptions than it manages to answer.
and there are factual errors, they said that planets are not dark matter, and thats just plain wrong. black holes, dust that doesnt glow, planets, asteroids, all that is dark matter. nothing mysterious about it.
kurtilein3 4 years ago