Philosophy
I know that may seem like a silly question at first glance, but there is a long history of seemingly silly questions that end up producing some mind-blowing and really counter-intuitive results that really get us to question our most basic presuppositions about the nature of reality, and in many cases redefine our understanding of the universe. This case is no exception.
So back to the question, sure, the sun is hiding on the other side of the planet, but there are stars in literally every possible direction, so photons are hitting us all the time from every possible direction. But if this is the case, shouldn't the night sky look bright from all these stars?
Well, as the following simple animation brilliantly demonstrates, the sky really is bright from all those stars... we just can't see all that light, not with our eyes anyway, but it is there, and what that tells us about cosmology and the universe is absolutely fascinating!
Bet you didn't see that coming, huh? No pun intended, actually. I was just blown away by the connections. This stuff is awesome :)
- Brian Greene - Why Is Our Universe Fined-tuned For Life?
Have you noticed that wherever Brian Greene goes, computer animations go with him? Well, this TEDTalk presentation is no exception :) I'm starting to wonder whether this might be the physicist equivalent of a comfort blanket... In any case,...
- Everything And Nothing - Everything
You may find this hard to believe, but we've known about the true size of the universe for only about 100 years. When Copernicus proposed his revolutionary heliocentric model, for instance, he still believed in the existence of a perfect celestial...
- Halloween Treats From Space
Black Widow Nebula In the constellation Circinus, where previous visible-light observations see only a faint hourglass-shaped patch of obscuring dust and gas, NASA's Spitzer Space Telescope's dust-piercing eyes see a big "Black Widow Nebula"...
- More Stars
I suppose that this news will make one feel better...three times the chance of alien encounter[s]. Regardless, it is humbling. "How Many Stars? Three Times as Many as We Thought, Report Says" by Kenneth Chang December 1st, 2010 The New York Times It...
- My First Telescope--gary Seronik
Like many backyard astronomers, one question I get asked all the time is “When did you get interested in the stars?” The truth is, I can’t remember a time when I wasn’t drawn to the night sky. Maybe part of the reason was that my family lived...
Philosophy
Olber's Paradox - Why Is the Sky Dark at Night?
So back to the question, sure, the sun is hiding on the other side of the planet, but there are stars in literally every possible direction, so photons are hitting us all the time from every possible direction. But if this is the case, shouldn't the night sky look bright from all these stars?
Well, as the following simple animation brilliantly demonstrates, the sky really is bright from all those stars... we just can't see all that light, not with our eyes anyway, but it is there, and what that tells us about cosmology and the universe is absolutely fascinating!
Bet you didn't see that coming, huh? No pun intended, actually. I was just blown away by the connections. This stuff is awesome :)
- Brian Greene - Why Is Our Universe Fined-tuned For Life?
Have you noticed that wherever Brian Greene goes, computer animations go with him? Well, this TEDTalk presentation is no exception :) I'm starting to wonder whether this might be the physicist equivalent of a comfort blanket... In any case,...
- Everything And Nothing - Everything
You may find this hard to believe, but we've known about the true size of the universe for only about 100 years. When Copernicus proposed his revolutionary heliocentric model, for instance, he still believed in the existence of a perfect celestial...
- Halloween Treats From Space
Black Widow Nebula In the constellation Circinus, where previous visible-light observations see only a faint hourglass-shaped patch of obscuring dust and gas, NASA's Spitzer Space Telescope's dust-piercing eyes see a big "Black Widow Nebula"...
- More Stars
I suppose that this news will make one feel better...three times the chance of alien encounter[s]. Regardless, it is humbling. "How Many Stars? Three Times as Many as We Thought, Report Says" by Kenneth Chang December 1st, 2010 The New York Times It...
- My First Telescope--gary Seronik
Like many backyard astronomers, one question I get asked all the time is “When did you get interested in the stars?” The truth is, I can’t remember a time when I wasn’t drawn to the night sky. Maybe part of the reason was that my family lived...