Space In General

Quadrillion???

I get it at slightly under 9 billion times the volume... The sun at about 1.5 trillion cubic kilometers, and the black hole at about 1.3*10^22.
 
I don't get why we can't see black holes if something like the movie Interstellar was supposed to portray a reasonably accurate representation of one. Surely we could see the Event Horizon of something so unbelievably massive?
 
wfooshee
Quadrillion???

I get it at slightly under 9 billion times the volume... The sun at about 1.5 trillion cubic kilometers, and the black hole at about 1.3*10^22.
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Volume is 4/3*pi*r^3 (r cubed)... the Sun's volume is about 1.4 x 10^18 km... that black hole is about 1.1 x 10^33 km
 
Touring Mars
Volume is 4/3*pi*r^3 (r cubed) - if the diameter is 90000x bigger then the radius is 45000x bigger, and 45000 cubed is about 1 quadrillion.
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Holy crap, I did area, not volume!!!!!
Note to self: no math before waking up.....

OTOH, if the diameter of one is 90,000 times the diameter of the other, then the radius is also 90,000 times the radius of the other.

We both need to be slapped! :)
 
Robin.
I don't get why we can't see black holes if something like the movie Interstellar was supposed to portray a reasonably accurate representation of one. Surely we could see the Event Horizon of something so unbelievably massive?
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Pretty sure we can with the gravitational lensing, but that's not technically directly observing the black hole, only seeing its effects on its surroundings.
 
Spurgy 777
Pretty sure we can with the gravitational lensing, but that's not technically directly observing the black hole, only seeing its effects on its surroundings.
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That's what I mean, we still don't have any pictures of a black hole bending the surrounding light into a glowing halo. If they are huge we should see a big black hole with a glowing outline.
 
Robin.
That's what I mean, we still don't have any pictures of a black hole bending the surrounding light into a glowing halo. If they are huge we should see a big black hole with a glowing outline.
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Because they are usually in the center of a very star populated area.

Maybe when the James Webb scope is flying around we will see more detail of black holes.
 
Also, depending on where you are observing it from, unless you are viewing it from dead-on, you'll see it as an ellipse not a circle. With the amount of bright light around it, not to mention anything that happens to be between it and yourself, they're just not large enough to see clearly with the technology we have right now. That's my understanding of it.
 
Robin.
That's what I mean, we still don't have any pictures of a black hole bending the surrounding light into a glowing halo. If they are huge we should see a big black hole with a glowing outline.
Click to expand...

Maybe they're hard to see from the photos, I can't find any good ones from a quick search, but considering entire galaxies were quite small in the photos, seeing a black hole would be very difficult.

Oh, and @Touring Mars and @wfooshee I worked out the density of the black hole you're talking about using this link;

https://www.spacetelescope.org/news/heic1602/

It says the diameter is 130mil km, giving it a volume of

4/3 x pi x 65,000,000^3 = 1.15x10^24 km^3

and the Suns volume is 1.41x10^18, 815,000 times less making the black hole 25,700 times as dense.
 
We can see from comparing Earth with Jupiter that it's not the density that makes gravity, but the mass. So even though it's nearly a quadrillion solar volumes (I get a little over 800 trillion times,) its mass is "only" 21 billion suns.

So who amongst us here knows how matter is spread inside the event horizon? Is most of the volume actually vacuum but with so much mass at the center that it can sling that event horizon that far out?
 
wfooshee
We can see from comparing Earth with Jupiter that it's not the density that makes gravity, but the mass. So even though it's nearly a quadrillion solar volumes (I get a little over 800 trillion times,) its mass is "only" 21 billion suns.

So who amongst us here knows how matter is spread inside the event horizon? Is most of the volume actually vacuum but with so much mass at the center that it can sling that event horizon that far out?
Click to expand...

Our current understanding suggests it's concentrated in an infinitely dense singularity in the middle as far as I know.

Also looking at the equation for Schwarzschild radius explains why the density is so low. The radius is proportional to the mass, so when the mass doubles, the volume goes up 8 times, decreasing the density by 4 times. Pretty much as you said.
 
12744402_10157087128070131_8685443912547304297_n.png


Static fire completed, launch & landing attempt planned for Wednesday @ 6:46pm EST.
 
A spectacular new image of the Milky Way has been released to mark the completion of the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL). The APEX telescope in Chile has mapped the full area of the Galactic Plane visible from the southern hemisphere for the first time at submillimetre wavelengths — between infrared light and radio waves — and in finer detail than recent space-based surveys. The pioneering 12-metre APEX telescope allows astronomers to study the cold Universe: gas and dust only a few tens of degrees above absolute zero.
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http://www.eso.org/public/news/eso1606/

To see larger photos, click on the links on the right, and then it will give you links to different image sizes.

eso1606a.jpg
 
For those that don't know, the SpaceX launch was scrubbed today and they will try again tomorrow (Thursday) at the same time.
 
So 4 of the best gambling addicts Maryland has to offer will have the opportunity to go to space:
http://baltimore.cbslocal.com/2016/02/25/maryland-live-casino-offering-free-trips-to-outer-space/

I live very near there, so I can say with almost certain confidence that it's probably going to be the most interesting social experiment ever. Just watch some of the people they interview and just imagine their reactions as they enter orbit.

I'm half an hour from there and I've got some shopping to do anyway, so I'll at least go to see Buzz Aldrin in person. Who knows, if I get bored I might head up there and gamble away a few dollars to see what happens. Who knows, I could be the first GTPlanet member to actually leave the planet. :P
 
Are these going to be actual orbiting flights (which the article seems to claim) or suborbital flights such as the ones Virgin Galactic will be offering? The article is woefully short on details such as who will be providing the actual space vehicles.
 
prousonhairy
This guy says we will be able to get people to Mars in one month with "photonic propulsion".



NASA Scientist: I can get humans to Mars in a month

http://usat.ly/20ZEXdu
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I read that earlier in the week, good theory however I wouldn't like to be the first one to be in there. Similar to the Felix guy who jumped from the edge of space, you just don't know till it's been done.
 
m8h3r
I read that earlier in the week, good theory however I wouldn't like to be the first one to be in there. Similar to the Felix guy who jumped from the edge of space, you just don't know till it's been done.
Click to expand...
I don't think I would like to go to Mars, it doesn't look like a good time. :) But, I'll sure and heck watch people try.

If this "phototonic propulsion" is all it's cracked put to be, maybe we can just skip Mars?
 
So you're shooting photons at the sail of the spaceship in the form of a laser beam.

How do you slow down once you get there? I suppose you'd have pre-positioned an automatic system of laser guns ready and waiting for you?

Oooh! I know..... You carry it with you and at the appropriate time, throw it out ahead of you so it fires back at your sail! Yeah, THAT's the ticket!!! :dopey:
 
SpaceX will reattempt to launch again today at 6:46pm EST.

Edit: had a small hold due to an incompetent boat captain then an abort at T-0. Launch scrubbed for today.

Edit 2: incompetent boat captain is the reason for the scrub. Idiot. Via Elon Musk - "Launch aborted on low thrust alarm. Rising oxygen temps due to hold for boat and helium bubble triggered alarm."
 
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Stupid question. But what happened if, say, the Oxygen from inside the spaceship is burst out in the middle of the no gravity space? Specifically what happen to the Oxygen, Spaceship, and the stuff inside it (my guess for latter is most likely follow the Oxygen)
 

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