s1ngular1ty2
s1ngular1ty2 t1_jd9r2h7 wrote
Reply to comment by boundegar in Research team finds indirect evidence for existence of dark matter surrounding black holes by karmagheden
It's not normal friction. It's dynamical friction. Friction from gravity. Dark matter is matter and therefore creates gravity. It interacts with any other matter via gravity.
s1ngular1ty2 t1_jd37zrr wrote
Reply to comment by subatomicslim in What is this exactly? I have seen this universe image a lot and never understood what it actually is by subatomicslim
It's a 3D image of the stars/galaxies we have mapped from Earth. You are seeing it from the side. It's from the Sloan Digital Sky Survey.
https://www.youtube.com/watch?v=1RXpHiCNsKU
We can't map the entire sky from Earth because the Milky Way is in the way. It limits the angles we can look. That is why there is a big blank area in the middle.
s1ngular1ty2 t1_jd18y5b wrote
Reply to comment by jilljackmuse in Why do we assume aliens have similar technologies or more advanced technologies than we do? by jilljackmuse
No but the gains we have left won't be things that people assume are possible like faster than light travel, faster than light communication, easy space travel, etc. All this stuff will remain super hard to do or impossible.
We will likely get better computers, communication technology, telescopes, better power sources, better computer learning, maybe AIs, faster travel across earth, but that's about it.
Going out of our solar system or between galaxies is never likely to be a thing that people will do.
s1ngular1ty2 t1_jd14j4r wrote
Reply to Why do we assume aliens have similar technologies or more advanced technologies than we do? by jilljackmuse
It's wishful thinking. We think we will progress a lot further than we have and expect other races to have also.
s1ngular1ty2 t1_jcmdxwl wrote
Reply to comment by InformalPermit9638 in In defence of dark energy | Nobel Laureate and dark matter pioneer James Peebles answers critics of dark energy. by IAI_Admin
I'm not interested in where you picked up your incorrect understanding. The video I posted is from a PHD in the field. Dark Matter is the accepted theory.
s1ngular1ty2 t1_jcmbxtf wrote
Reply to comment by InformalPermit9638 in In defence of dark energy | Nobel Laureate and dark matter pioneer James Peebles answers critics of dark energy. by IAI_Admin
Gravitational lensing, CMB analysis, the bullet cluster, etc all prove dark matter exists and MOND doesn't prove how any of these work.
So it's pretty clear MOND is not the answer.
s1ngular1ty2 t1_jcm8i6e wrote
Reply to comment by YawnTractor_1756 in In defence of dark energy | Nobel Laureate and dark matter pioneer James Peebles answers critics of dark energy. by IAI_Admin
The names were invented for REAL observations. They observed things happening that could not be explained without extra mass or energy. The names are made up but the phenomena is real.
All names are made up by the way.
s1ngular1ty2 t1_jcm8b5q wrote
Reply to comment by InformalPermit9638 in In defence of dark energy | Nobel Laureate and dark matter pioneer James Peebles answers critics of dark energy. by IAI_Admin
How though when it doesn't explain all observations? Most scientists don't believe MOND is the answer because of this.
s1ngular1ty2 t1_jc5skk9 wrote
Reply to Dust on Mars Rover's solar panels by LiveComfortable3228
The latest rovers don't even use solar panels so it really isn't an issue.
s1ngular1ty2 t1_jbh3nyb wrote
Yes unlikely by the mathematical definition but not impossible.
s1ngular1ty2 t1_j2bv4q8 wrote
Can one exist? Maybe... Can we ever visit it? Probably not...
s1ngular1ty2 t1_j2buukm wrote
Reply to comment by Codametal in Question by Psychological_Wheel2
We can't run out of water. You can make fresh water from sea water. There is zero chance we run out of water.
Not many places do this now because it's expensive but if we don't have a choice it will be done. It's still far cheaper than doing anything in space.
s1ngular1ty2 t1_j2bte9z wrote
Reply to Question by Psychological_Wheel2
We can't really run out of water...75% of the Earth's surface is water.
s1ngular1ty2 t1_j29wfvc wrote
I mean Europeans buy mercedes and land rover. They hardly have good taste since those vehicles have some of the worst quality records in history. So this feels about right.
s1ngular1ty2 t1_j28e6jb wrote
Reply to What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
Here is another good video showing what you'd see but simplified for a non-rotating black hole.
s1ngular1ty2 t1_j28c8zw wrote
Reply to comment by LookingForDialga in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
You'd actually use a penrose diagram and plot it out on there.
s1ngular1ty2 t1_j288swm wrote
Reply to comment by The-Temple-Of-Iron in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
There is no outside the universe. Just stop. The universe is everything that exists.
s1ngular1ty2 t1_j288o2v wrote
Reply to comment by triffid_hunter in What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
You can 100% cross it. You only appear to stop to outside observers. You don't actually stop.
s1ngular1ty2 t1_j288lmn wrote
Reply to What is our current "best guess" about how to observers that entered a black hole on opposite sides would look to each other once they crossed the event horizon? by WittyUnwittingly
You can't see them, no paths for light lead to them. All paths lead to the center. Light can not go from them to you or vise versa. The only light you can see is from where you came from.
You'd see something like this.
https://www.youtube.com/watch?v=HuCJ8s_xMnI
Note, all real black holes spin and drag space with them in a tremendous vortex of warped space time like you see in this video.
Also all the light you see is from the accretion disk being bent around the black hole into your eyes from all sides of the black hole. The light you see may look strange but it is accurate and from the accretion disk. You see it everywhere because of how the space is warped near the black hole. Light from all sides of the black hole can reach you because of the warped space.
s1ngular1ty2 t1_j2886rj wrote
Reply to comment by Xethinus in Time dilation and death to black holes by AnOriginalMan405
No man, you fall in and you die. The black hole still is there. Sorry that is how it works.
Time is slowed for you and the black hole. So it will live on far far after it has crushed you into a pulp.
You are confusing reference frames. If your time is slowed, the black hole's time is slowed relative to an outside observer. So you are experiencing the same time. Not sure how it could age more quickly than you or more quickly than the outside observer when it is also experiencing time dilation.
s1ngular1ty2 t1_j282czr wrote
We have seen this already. We also have seen stars collapse into black holes. Not sue what you expect to come of this...
We can't observe it directly because objects in space are VERY far away and small. We can however see that there was a supernova and the star is gone and now there appears to be a feeding black hole because there are massive jets coming out of where the star used to be or a blank spot where it used to be.
s1ngular1ty2 t1_j281ktn wrote
Reply to comment by Xethinus in Time dilation and death to black holes by AnOriginalMan405
Nope. You only appear to be part of the event horizon to a distant observer. You actually travel to the center of the black hole and are crushed and die. It is inevitable because all paths inside a black hole flow to the center. It is actually impossible to not reach the center. Even if you change direction you reach the center. It is as inevitable as time itself. Trying to go out of the black hole is like going back in time and so is impossible.
You are confusing what a distant observer sees to what happens to you.
s1ngular1ty2 t1_j27z0nr wrote
First of all, there is no singularity. That is a mathematical object not a physical object. It represents where our math fails. Also you don't even have a complete picture because there are in fact multiple mathematical singularities inside a spinning black hole and it is far more complex than you are probably aware of. You have a novice interpretation of it.
Secondly, for you time is not slowed from your perspective. You pass towards the center of the black hole and reach it at a normal rate.
You would definitely die before the black hole does.
Spinning black holes (which they all are)... https://youtu.be/kIbP2Sg8y18
s1ngular1ty2 t1_j27yn71 wrote
This has to be a bot or this question is coming from a social media platform of some kind because it keeps getting asked.
s1ngular1ty2 t1_jdfkvuz wrote
Reply to comment by dungisdangit in So from what I understand Sagittarius a is in the Center of Milky Way. If any planets orbit this black hole would there be time dilation? by EarthInteresting9781
Not really. Our solar system is not orbiting the black hole. We are orbiting the center of mass of the galaxy, and it's dark matter, not the black hole. The black hole is insignificant as far as orbits of the galaxy are concerned. The dark matter of the galaxy dictates the orbits because it is 5x more massive than all the other matter combined.