What Are Brown Dwarfs? | Astronomic

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🍻 Tovi Sonnenberg ($5)
🍻 Christine Pines ($2)
🍻 Christopher Beattie ($1)
🍻 Kalistence ($1)
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📝 Licensed under Creative Commons Attribution 3.0
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[frantic]

Honestly I didn't see your sub count, then I started to guess how much u had. I was thinking about around 200-300k, I see 6000... These video's are really good u deserve more subs!!! hope u will get there soon

[daltonmorgan]

Brown dwarfs have a lifespan well over a trillion years. That means every single brown dwarf we can observe is still in it's very early early infancy since the big bang happened only 14 billion years ago. Crazy thing to think about

[EuricoRoberto]

Another fascinating vid. Please make a video about Neutron Stars. Cheers!

[fissionmailedsuccessfully]

I also like to learn about brown drawves in my universe. It's the most fun you can pawsibly have

[newbyfollome]

your videos are amazing, its obvious that you really care about your videos.

[pradeepshrestha]

it's nice when you have a question in your mind and there's answer on the internet. thanks!

[JD_]

Nice video, well explained.
And at around 2:28, they seem to move and get bigger, or is it just illusions??

[MrYitzhak]

Why the heck you have so low subs and views!? You're videos are very interesting! Sigh...

[KutWrite]

Isn't there another way to form a brown dwarf? I recall that some smaller stars, after collapsing and cooling, can become a brown dwarf.

[Serenoj]

Many things are incorrect as far as I know. In short: the need to categorise humans have gets them into trouble. Brown Dwarfs commonly are referred to object between 13 and 80 Jupiter masses. 13 being the lower limit for Deuterium fusion and 80 being the lower limit of hydrogen fusion. Since dueterium is scarce it is quickly completely fused and older brown dars do not fuse anything. Another limit is lithium fusion. A star burns through its litium within 100 Myr. A brown dwarf does not. But there is serious problem: brown dwarfs below 65 MJ don't fuse lithum. Above it depending on the mass it does in fact fuse lithium and in general it is fused within 500 Myr. To complicate matters: there are Brown Dwarfs that are heavier than the lowest mass stars! These brown dwarfs are very pure and lack almost any metalicity so inspite of their mass they still cannot fuse. The heaviest Brown Dwarf ver discoverd has a mass of 90 MJ. The lowest weight stars are almost 20% lighter!
When two stars are formed in a system there is no astronomer in the world that would deem the smaller one to be a planet. Here the fact that it fuses is enough to Ensure it is a star. When a Brown dwarf of 50 MJ is orbiting a star at least some scientists wuld call it a planet and no longer a brown dwarf regardless of its compositionor the fact htat it burns or has burned deuterium....If the very same object with the very same composition would have been formed on its own it would now be a brown dwarf. That makes little sense to me.Even more intruiging is the fact that some heavy brown dwarfs fall in the L-type spectrum of...stars and a few even get hotter than that and are M6. They are just as bright and hotas Red Dwarf stars! Also: these brown dwarfs can behave just like a red dwarf and can become extremely bright because they have enormous solar flares, far greater than anything our sun produces.
They have sunspots (or are expected to have them)So in the end the problem with brown dwarfs is that at least until today it is a transitional object. Most start out very much like stars but over the billions years they just cool off since they never will fuse hydrogen. They can start of very much like small stars being fuly convective and flaring they are much alike Red Dwarfs. After 5-10 billion years they are becoming more and more like Jupiter. A gas giant. But every single star is transitioning into something else over its lofetime. Red Dwarfs will cool off just like Brown Dwarfs will, it will take about 1000 times as long though. Sun like stars will eventually cool off too into white dwarfs and than black dwarfs. It will take much longer still than brown dwarfs. May be in the end it is better to give them an own name and within that group various categories. Stars are divided in to seevral groups. We could do the same with brown dwarfs. May be they should be called substars and then D-substars and L-substars where D-sbstars have fuesed deuterium but not lithium and L-substars have fused lithium but not hydrogen. Spectral classes should of course remain the same.

[litromengercrif]

All brown dwarfs have same shape thus having same quantity if the gases are same in each dwarfs so the gases do not react because of unequal composition of gas

[animequeen]

Also, in order for a planet to be in the goldilocks zone, they have to be closer to the brown dwarf than Earth is to the sun, increasing the radiation on the planet's surface.

[earthplanet]

I'm a life planet not a gas giant/brown dwarf

[texas_red]

If there's 100, 000, 000, 000 stars in our galaxy and 2 brown dwarfs for every star. Then 100, 000, 000, 000/2 = 50, 000, 000, 000. So then that would mean there are 50 billion brown dwarfs for the 100 billion stars in our galaxy

[Kombrig_]

You suppose to present a classification of the BD: L, T and Y (ultra-cool) and their masses. Or you don't know this basic classification? Then why did you shoot this clip?