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Check voguevignette's Instagram Because I can't get enough of Carl these days... "imagination will often times carry us to worlds that never were. Without it we go nowhere." -Carl Sagan 
Background artwork is from my favorite artist muse, Erte titled New Bridge for the Seven Seas, 1919. 1458906952768138710_12202051

Because I can't get enough of Carl these days... "imagination will often times carry us to worlds that never were. Without it we go nowhere." -Carl Sagan Background artwork is from my favorite artist muse, Erte titled New Bridge for the Seven Seas, 1919.

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Check martin_heck's Instagram You never get used to the incredible sunrises over the vast spaces of the south african karoo. #timelapse #starstuff #saao #salt #southafrica #karoo 1458883525927658980_542757512

You never get used to the incredible sunrises over the vast spaces of the south african karoo. #timelapse #starstuff #saao #salt #southafrica #karoo

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Check leebutterworthphoto's Instagram "The atoms of our bodies are traceable to stars that manufactured them in their cores and exploded these enriched ingredients across our galaxy, billions of years ago. For this reason, we are biologically connected to every other living thing in the world. We are chemically connected to all molecules on Earth. And we are atomically connected to all atoms in the universe. We are not figuratively, but literally stardust." - Neil deGrasse Tyson #stardust #starstuff #stars #milkyway #neildegrassetyson #quotes #nightphotography #nightsky #night #astrophotography #nikon #nikonlove #nikonphotography #nikonnofilter 1458872493245737827_2149842255

"The atoms of our bodies are traceable to stars that manufactured them in their cores and exploded these enriched ingredients across our galaxy, billions of years ago. For this reason, we are biologically connected to every other living thing in the world. We are chemically connected to all molecules on Earth. And we are atomically connected to all atoms in the universe. We are not figuratively, but literally stardust." - Neil deGrasse Tyson #stardust #starstuff #stars #milkyway #neildegrassetyson #quotes #nightphotography #nightsky #night #astrophotography #nikon #nikonlove #nikonphotography #nikonnofilter

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Check astrophysicsig's Instagram How do we know if the universe will keep expanding forever? 
There is really only one way for the universe to stop expanding: that is if there is enough mass in the universe for the gravity to overcome the expansion. The density of mass (amount of mass per volume of space) that is required to halt the expansion is often called the "critical density." If the universe is more dense than critical, the gravity of all the stuff in the universe will be able to overcome the expansion, causing it to stop, and eventually re-collapse. If the density in the universe is smaller than the critical density, then the expansion will continue forever.
It is very difficult to determine what the density of the universe is, because most of the matter in the universe doesn't give off light that we can see in our telescopes. But we can go out and measure how many galaxies are out there, and how fast they orbit each other (The more massive galaxies are, the faster they will orbit). This gives us a fairly good idea of the density. We can also try to directly measure how quickly the expansion is decelerating by measuring the expansion speeds of distant galaxies. This is also a very difficult experiment.

Astronomers' understanding of this problem has changed dramatically since we first answered this question in January 1999. There's now convincing evidence that the expansion of the universe is actually accelerating, not decelerating. This cannot be due to gravity. It must be due to "dark energy", a repulsive force of empty space that counteracts gravity on large scales. 
Assuming astronomers' interpretations of the data are correct, and the universe is indeed accelerating at an ever-faster rate, we still don't know what the ultimate fate of the universe is going to be because we don't know if the dark energy will always be repulsive. There are some models that allow for it to become attractive in the future, which would cause the universe to ultimately recontract. But if dark energy is real, then the density of matter will no longer have much impact on the final fate of the universe, because dark energy tends to win out over gravity in the long run. 1458829661214699964_4008710248

How do we know if the universe will keep expanding forever? There is really only one way for the universe to stop expanding: that is if there is enough mass in the universe for the gravity to overcome the expansion. The density of mass (amount of mass per volume of space) that is required to halt the expansion is often called the "critical density." If the universe is more dense than critical, the gravity of all the stuff in the universe will be able to overcome the expansion, causing it to stop, and eventually re-collapse. If the density in the universe is smaller than the critical density, then the expansion will continue forever. It is very difficult to determine what the density of the universe is, because most of the matter in the universe doesn't give off light that we can see in our telescopes. But we can go out and measure how many galaxies are out there, and how fast they orbit each other (The more massive galaxies are, the faster they will orbit). This gives us a fairly good idea of the density. We can also try to directly measure how quickly the expansion is decelerating by measuring the expansion speeds of distant galaxies. This is also a very difficult experiment. Astronomers' understanding of this problem has changed dramatically since we first answered this question in January 1999. There's now convincing evidence that the expansion of the universe is actually accelerating, not decelerating. This cannot be due to gravity. It must be due to "dark energy", a repulsive force of empty space that counteracts gravity on large scales. Assuming astronomers' interpretations of the data are correct, and the universe is indeed accelerating at an ever-faster rate, we still don't know what the ultimate fate of the universe is going to be because we don't know if the dark energy will always be repulsive. There are some models that allow for it to become attractive in the future, which would cause the universe to ultimately recontract. But if dark energy is real, then the density of matter will no longer have much impact on the final fate of the universe, because dark energy tends to win out over gravity in the long run.

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Check spirit_voyager's Instagram ☆☆☆
#Repost @something.dani
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new moon eclipse wisdom. #eclipseinsights #eclipse #newmoon #pisces #piscesnewmoon #piscesnewmooneclipse #astrology #starstuff #danikatz 1458827741390397738_2072754438

☆☆☆ #repost@something.dani ・・・ new moon eclipse wisdom. #eclipseinsights #eclipse #newmoon #pisces #piscesnewmoon #piscesnewmooneclipse #astrology #starstuff #danikatz

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Check mysigncollection's Instagram Great advice for this new moon in Pisces 🐟
#Repost @something.dani ・・・
new moon eclipse wisdom. #eclipseinsights #eclipse #newmoon #pisces #piscesnewmoon #piscesnewmooneclipse #astrology #starstuff #danikatz 1458812850192703408_1943857085

Great advice for this new moon in Pisces 🐟 #repost@something.dani ・・・ new moon eclipse wisdom. #eclipseinsights #eclipse #newmoon #pisces #piscesnewmoon #piscesnewmooneclipse #astrology #starstuff #danikatz

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Check unconventionaldreamer's Instagram Thanks for the recommendation @drewdeorsey ! Can't wait to dive in! 1458810719696272050_33818310

Thanks for the recommendation @drewdeorsey ! Can't wait to dive in!

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Check astrophysicsig's Instagram Can the theory of formation of the solar system explain all the observables?

This is explained by the Lewis Model. In the early Solar System, which was a cloud of gasses, the inner parts were warmer than the outer parts. In the inner region, only things like metal or rock could condense, so the inner planets (Mercury, Venus, Earth, and Mars) are composed chiefly of metal and rock. As you move out to the cooler outer regions, it gets cool enough for things like water ice, and then ammonia and methane ice to condense.

The reason why the outer layers of the gas giants (Jupiter, Saturn, Uranus, and Neptune) are composed of lighter elements is that these planets grew larger than the Earth, quickly. There are two reasons why. One is that, in the outer regions, it was cool enough for a larger range of materials to condense -- not only rock and metal, but also things that condense at cooler temperatures such as water ice and ammonia ice, so there was more "raw materials" for the planets to be made of. The other reason is that ice sticks together better than rocks and metals, so when the ice that had condensed in small pieces ran into other pieces of ice, it tended to make bigger pieces, rather than bounce off or fragment as pieces of rock do. The outer planets originated as big planets made of ice and rock. The were massive enough that their gravity allowed them to accummulate hydrogen and helium, which the inner planets did not have enough mass to hold on to, and grow to their current titanic proportions.

#astronomy #astronomer #astrophysics #space #cosmos #science #physics #universe #stars #planet #astronaut #constellation #interstellar #spacetravel #outerspace #sun #chandra #astrobiology #NASA #Hubble #telescope #galaxy #stargazing #starstuff #creation #photography #astrophotography #amazing #explore #nasabeyond 1458811257808281770_4008710248

Can the theory of formation of the solar system explain all the observables? This is explained by the Lewis Model. In the early Solar System, which was a cloud of gasses, the inner parts were warmer than the outer parts. In the inner region, only things like metal or rock could condense, so the inner planets (Mercury, Venus, Earth, and Mars) are composed chiefly of metal and rock. As you move out to the cooler outer regions, it gets cool enough for things like water ice, and then ammonia and methane ice to condense. The reason why the outer layers of the gas giants (Jupiter, Saturn, Uranus, and Neptune) are composed of lighter elements is that these planets grew larger than the Earth, quickly. There are two reasons why. One is that, in the outer regions, it was cool enough for a larger range of materials to condense -- not only rock and metal, but also things that condense at cooler temperatures such as water ice and ammonia ice, so there was more "raw materials" for the planets to be made of. The other reason is that ice sticks together better than rocks and metals, so when the ice that had condensed in small pieces ran into other pieces of ice, it tended to make bigger pieces, rather than bounce off or fragment as pieces of rock do. The outer planets originated as big planets made of ice and rock. The were massive enough that their gravity allowed them to accummulate hydrogen and helium, which the inner planets did not have enough mass to hold on to, and grow to their current titanic proportions. #astronomy #astronomer #astrophysics #space #cosmos #science #physics #universe #stars #planet #astronaut #constellation #interstellar #spacetravel #outerspace #sun #chandra #astrobiology #nasa #hubble #telescope #galaxy #stargazing #starstuff #creation #photography #astrophotography #amazing #explore #nasabeyond

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Check shea_maddie's Instagram We're #WRAPPED! You humans are some of the best around! Thanks for putting up with my profanities on set, and for #Casting me in my first #Commercial! #Pablo is gonna knock socks off. 
#NYC #NewYorkCity #StarStuff #WorkingActor #Actress #ActorLife #SetLife #Love #Film #SupporttheArts #SupportStartUps #BePresent #BeKind #BeDrinkingonSet 1458780961504621762_266624873

We're #WRAPPED! You humans are some of the best around! Thanks for putting up with my profanities on set, and for #castingme in my first #Commercial! #pablois gonna knock socks off. #nyc #newyorkcity #StarStuff #workingactor #actress #actorlife #setlife #love #film #supportthearts #supportstartups #bepresent #bekind #bedrinkingonset

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Check galacticstormcloud's Instagram #universe #nebula #blue #red #yellow #orange # purple #starstuff 1458574946636481946_2922449983

#universe #nebula #blue #red #yellow #orange # purple #starstuff

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Check ever_so_fetch's Instagram We r all made of #starstuff #stars #goodvibes #universe #space #highaf #greatunknown 1458524147591229318_1606147823

We r all made of #starstuff #stars #goodvibes #universe #space #highaf #greatunknown

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Check sarinaxoden's Instagram We have calcium in our bones, 
iron in our veins, carbon in our souls, nitrogen in our brains, 
93 percent stardust, with souls made of flames, we are all just stars that have people names. ~Nikita Gill
✨🌌💫🌟🌍☄️✨
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#93percentstardust #theuniverseisinus #starstuff 1458451867293092061_1721358357

We have calcium in our bones, iron in our veins, carbon in our souls, nitrogen in our brains, 93 percent stardust, with souls made of flames, we are all just stars that have people names. ~Nikita Gill ✨🌌💫🌟🌍☄️✨ • • #93percentstardust #theuniverseisinus #starstuff

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Check susiescott100's Instagram We are star stuff... let it swirl around you.  @imafuckingunicorn
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@madbutt #hoolahoop #universe #starstuff #play #meaningoflife 1458438338264322109_12449201

We are star stuff... let it swirl around you. @imafuckingunicorn ・・・ @madbutt #hoolahoop #universe #starstuff #play #meaningoflife

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Check misskzop's Instagram This is what we can expect to happen to our sun...in about 6 billion years! #ScienceSaturday #sciencerules #teachergram 
#Repost @explorenasa
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The Calabash Nebula is a spectacular example of the death of a low-mass star like the sun. This image taken by the NASA/ESA Hubble Space Telescope shows the star going through a rapid transformation from a red giant to a planetary nebula, during which it blows its outer layers of gas and dust out into the surrounding space. Astronomers rarely capture a star in this phase of its evolution because it occurs within the blink of an eye — in astronomical terms. Over the next thousand years the nebula is expected to evolve into a fully-fledged planetary nebula. Happy #spaceSaturday folks! 
Credit: ESA/Hubble & NASA, Acknowledgement: Judy Schmidt

#NASA #ESA #Hubble #starstuff #universe 1458367165647597759_1544323316

This is what we can expect to happen to our sun...in about 6 billion years! #sciencesaturday #sciencerules #teachergram #repost@explorenasa ・・・ The Calabash Nebula is a spectacular example of the death of a low-mass star like the sun. This image taken by the NASA/ESA Hubble Space Telescope shows the star going through a rapid transformation from a red giant to a planetary nebula, during which it blows its outer layers of gas and dust out into the surrounding space. Astronomers rarely capture a star in this phase of its evolution because it occurs within the blink of an eye — in astronomical terms. Over the next thousand years the nebula is expected to evolve into a fully-fledged planetary nebula. Happy #spacesaturdayfolks! Credit: ESA/Hubble & NASA, Acknowledgement: Judy Schmidt #nasa #esa #hubble #starstuff #universe

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