Evidence of black holes | Space with Sarah #7 | @spacewsarah

Black holes are mysterious objects. They are so massive that even light cannot escape them! This makes them hard for astronomers to actually detect as we cannot *see them*. In this video astrophysicist, Sarah, explains how we can infer that a very massive black hole must exist at the center of our own galaxy, the Milky Way, based on the motions of stars in the center of our Galaxy. As it turns out, all massive galaxies seem to have super massive black holes at their centers. Please ask any questions you might have in the comment section.

Creator: Sarah Pearson
Producer: Brett Van Deusen
Animator: Joshua Bogy

Image credits:
NASA Hubble
NASA Spitzer
ESO
ESO/GAIA
Steve Bowers
Via Lactea II - Diemand et al. 2008, Nature

Digital graphics by Morgan Mullen
Episode background: Via Lactea II simulation by Diemand, Kuhlen, Madau et al. 2008, Nature
Sound design by Tim Korn
Color correction: Jeff Sousa

Partially supported by the National Science Foundation: NSF grant AST-1614743

[RobboRob]

Hi Sarah, Isn't the extreem bending of the space by the gravitation of the black hole causing light not being able to escape? The light ray "thinks" it is traveling in a straight line but the gravitational bending is causing it to circle, or falling into the black hole... That would better explain why light, without having mass, can't escape a black hole...

[jnielsen]

Hi Sarah, thanks for a nice show! I have a question about black holes... As I understand black holes, everything within the event horizon have been trapped unable to escape. Do we have any idea about the radius of the event horizon and how it correlate with mass and is it possible to calculate some form of density for black holes?

[KafshakTashtak]

Question: If mass warps space-time continuum and gravity needs space to move out and reach other objects, how does gravity come out of a black hole? I mean if some mass goes into the black hole, the mass of the black hole increases, but how does the gravity of the added mass come out? Shouldn't we just see the initial mass that was there? Or can the gravity come out of a black hole?

[Jayguevara]

Have you reserved some quality time with the Event Horizon Telescope yet, Sarah? :-P

[hmanshmshra]

if light have weight then how light travel with such speed ??
because it is not possible for any object which has mass to travel such a speed.
pzz ans 😴

[mprphy]

can neutrinos interact with black holes

[sbkarajan]

Hey Sarah, so where is the "evidence" of black hole again? 4 million solar mass, if it is another star with the same density as the sun, only 160 times the diameter of the sun, which is not that huge considering the size of the galaxy, and such star could have existed, and that does not necessarily have to be a black hole. So, where is the "evidence"???? I totally wasted by time here...

[ogjohnson]

Scientist's are so Funny and scary at the same time. Scientist's create lie's for there own satisfaction when they cant understand how things work. The scary part is that there trained to lie and believe there lie to become true SMH.