Why Is Space Dark And There Is Light On Earth?
471There's a question that often comes up during those evenings when friends gather and the conversation drifts to some incomprehensible physical principle related to astronomy. Usually, under the starry sky, preferably in summer, it's not uncommon for someone to eventually look up and ask, "Why is space dark?"
The unfortunate person who asks this question often receives a variety of explanations, where complex concepts like relativity and cosmology are mixed with simpler ideas like light refraction—incorrectly, of course. And when we say "incorrectly," it's because the person asking the question is almost always confusing two very different phenomena, even though both involve space and darkness.
One thing is to ask, "Why is the sky seen from space always completely dark, even in the presence of the Sun?" Another is to wonder, "If there are indeed billions and billions of stars in the universe, enough to cover the entire celestial sphere, why doesn't their light illuminate our nights like the Sun does during the day?"
Folks, if you're up for it, follow me, because the topic is really complicated.
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Credits: Ron Miller, Mark A. Garlick / MarkGarlick.com ,Elon Musk/SpaceX/ Flickr
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00:00 Intro
01:26 First human in space
02:27 Why Earth’s Sky is Bright
04:51 Olbers' Paradox
10:32 Cosmology Solves the Paradox
12:03 Possible explanation
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#insanecuriosity #darksky #spacedark