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They just dealt with ben simmons over this last offseason and this whole season it looks like it's going to be another long offseason there in philadelphia. >> we are all shaking our heads here asking did joel embiid just say that is correct i'm here with a columbia astro physicist and we are shocked that he said this with james harden, he is not the player he used to be. >> you have to feel really bad for joel embiid, he is out there with a fractured face, busted up thumb, giving it his all. i think he is for the second straight year looking around like, man, this is what i have to deal with?...

You got to see this. >> oh, i'm looking. >> it is a huge hole at the center of our milky way galaxy. this actually shows a black hole surrounded by a ring on light, gases, and dust. >> it's 27,000 light years away, ask. raies of light are being bent by the huge force of gravity coming from this black hole. >> my, my. >> mow we understand perfectly. this is an astro physicist at harvard. jonathan, it's great to have you here. it looks like a flaming donut to me. what do you see when you look at

Any light close enough gets swallowed by the black hole — leaving behind just that dark void in the centre. the object, "sagittarius a—star" is located 26,000 light—years from earth. it's incredibly dense — four million times the mass of our sun. so, what exactly is a black hole? here's one astro—physicist, with the answer. black holes are objects that are so dense that nothing can escape from them, not even light, so they are where space and time of literally collapsing on themselves, so we are really breaking the laws physics as we know, so these are really extreme objects that pro...

Joining me now hakeem aluceae, astro physicist and author of "a quantum life". i have so many questions, i'm going to jump right into it. first of all, i'm kind of a nerd about all this stuff. i did not know there are over 25,000 asteroids right now, and it does, it really sounds like the plot in armageddon. how concerned should we be that these asteroids could come hit planet earth at any time? and does this whole plan of crashing into it actually work? >> well, first of all, thank you, tiffany, for having me. i'm a nerd all the time, and i'm very happy to geek out with you this morning. the ...

You can't have roads with distance on them unless you can refill. he's exactly right. for space to become a next frontier to boldly go. it's not the final frontier, just the next frontier, you are need all that infrastructure and that could take time. decades, not centuries for sure. >> would you want to go on blue origin or any other space flight? >> i'm an astro physicist. how high up does it go? it goes the thickness of two dimes above. so for me -- and then you're boldly going where hundreds have gone before. so for me, i would get on a spaceship if you're going to take me somewhere, the m...