Hi Bob; Since I've discovered hot to find the North Star via the Big + Little Dipper; (which I luv); what is the Constellation that looks like "a small W" in the sky?
There are so many mysteries left in life--in the atom, in the universe, in our own minds. It seems to go hand in hand with beauty.
Remember the definition of "invisible" -- it means only that light (wavelengths our eyes can detect) does not interact with it. The term "darK" is perhaps more descriptive than "invisible", as it connotes something we have no knowledge of. Yet, that is. Our mathematical models may lead us to a way to understand what's going on. I think the answer will surprise us, when we learn it.
Hi -- you mean 1933, right? Sorry I didn't make the chronology clear. I'll do it now. In the 1920s, we first discovered the speeds of external galaxies. In 1933, Zwicky showed that something about them didn't make sense. Since then, we've made periodic confirmations of this "dark matter."
Actually, I meant did you mean 71 years which would be 1943 or 81 years which would be 1933. However, thank you for your explanation.
I read that we only know 5% of our universe is matter that we can see. That's an awful lot of invisible stuff.
Yes, you're right. As bad as "dark matter" is, which is an unseen pulling (gravity-like) force, there's also "dark energy", a mysterious unseen repelling force, which appears to constitute most of the cosmic inventory. Kind of humbling, to be ignorant of most of the universe.