Space Knowledge

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To dispel my own irritation, here are some important definitions:

Space is anywhere outside the Earth's atmosphere.

Deep Space is outside this Solar System.

Galaxy is a generally spiral shaped collection of stars and other matter that is thought to orbit around a Black Hole. The number of stars in our Galaxy is thought to be in the billions. At light speed, Scientists say that it would take 200,000 years to cross it.

The Universe has unnumbered Galaxies in it. Our own Galaxy is thought to be in a group of Galaxies that occupy the Lanea kea group.

This information likely has flaws.

End.

Comments

Our solar system size

What do you consider our solar system?

Is it anything that orbits our Sun or just the known major and dwarf planers?

IMHO our solar system is extends tothe furthered most orbiting object so far discovered

Alpha Centauri System

Daphne Xu's picture

https://en.wikipedia.org/wiki/Alpha_Centauri

Alpha Centauri consists of two stars orbit about a common center of mass, separation ranging from Saturn to Neptune's distance to Sun -- and a third star, Proxima Centauri about a fifth of a light-year away from the other two. Despite being bound gravitationally, we have good reason to treat Proxima Centauri separately from Alpha Centauri.

  • Proxima Centauri is two degrees -- four lunar diameters -- away from Alpha Centauri in the sky. One would aim a telescope in a different direction.
  • A spacecraft to Proxima Centauri would have a different trajectory from one to Alpha Centauri.
  • Proxima Centauri is unambiguously closer, and will be for tens of thousands of years. Should we really let the subtle difference between being gravitationally bound and unbound distinguish between calling Proxima Centauri and Alpha Centauri the closest star? Or affect how we treat Proxima Centauri?

I'm reminded of "Star Trek -- The Motion Picture" and V-ger, perhaps a thousand or ten thousand light-years away, targeting precisely the third planet of the sun. I'm also reminded of "Star Wars" zooming past numerous stars when jumping to hyperspace, or finding a nearby star system when the hyperdrive fails.

-- Daphne Xu (a page of contents)

An alternative definition

Is that our solar system ends when the gravitational pull of the sun is so slight that no matter how big an object is there it does not start moving towards the sun. That is a point that can be measured.
Samantha

... so slight ...

Daphne Xu's picture

That would be a point where the gravity of other stars balance the sun's gravity. (If the sun were isolated, no such point would exist.)

-- Daphne Xu (a page of contents)

Space is big. Really big. You

leeanna19's picture

Space is big. Really big. You just won't believe how vastly hugely mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist, but that's just peanuts to space.

cs7.jpg
Leeanna

Whenever life...

Erisian's picture

"Whenever life gets you down, Mrs. Brown, and things seem hard or tough..."

Galaxy Song

".. So remember when you're feeling very small and insecure, how incredibly unlikely is your birth! And pray that there's intelligent life somewhere off in space, because it's bugger all down here on Earth!"

-hugs- Had to link this! <3

Coincidentally or not...

... all telescopes that look for intelligent life in the Universe are pointed away from Earth.

Seen on a restroom wall

Patricia Marie Allen's picture

"Beam me up Scottie, there's no intelligent life down here."

Hugs
Patricia

Happiness is being all dressed up and HAVING some place to go.
Semper in femineo gerunt
Ich bin eine Mann

But...

to the flat earthers... it does not exist and to the creationists, it is only a few million years old.
Someone has to be wrong.

Samantha

Oh, and the moon landings were filmed on a Hollywood back lot. :) :)

Ages

Erisian's picture

And to the simulationists it was created anew only a few minutes ago...after yet another server reboot! Hail to the Lord of Backups!

(How often does this happen, you ask? That depends on which denomination you ascribe belief to. As for me, I suspect every other Thursday...from Thor spilling beer on the servers again!! :) )

In My Universe

In my universe the edge of the atmosphere is the church at the top of the village, the edge of the solar system is the turn onto the main road and the edge of the galaxy is that village over a bit. The one we don't like, with the people who eat turnips. Any further than that involves wonders beyond most of us simple folk's barren imaginations (a horse.)