Classroom Aid - Type 1a SN Gravitational Lensing

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This is a segment of the "How Far Away Is It" 2017 review.
2017 was another very interesting year with a number of firsts. We detected our first asteroid from another star; a Type 1a Supernova companion survivor; a star collapse into a black hole without a supernova; a gravitationally lensed Type 1a Supernova; a non-elliptical early dead galaxy; colliding neutron stars; and visual confirmation of a gravitational wave.
  1. David Butler
  2. STEM
  3. gravitational lensing
  4. type 1a supernova
  5. iPTF16geu
  6. hubble constant
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Sir, thank you for the videos. i can't believe you are still alive and publishing more videos! Keep doing it please!

bellekiller
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Thank you Mr. Butler for all your wonderful videos. I have enjoyed them so much and have learned a great deal even in my old age. I have a question for you related to this topic. For a given galaxy, say NGC 4522, its distance is determined to be 60 mly away. If it were stationary, that would imply that Hubble is seeing the galaxy as it was in Paleocene time 60 million years ago, not as it is today. My question is: Is there a way to determine how much closer NGC 4522 was to us when it emitted the light that Hubble sees today, so that we could truly determine how far back in time we are seeing. It would seem that we could use algebra on v=HR to determine that, but something tells me that the situation is not that simple. Thank you for your time and attention, and again, for your wonderful videos.

luvinthejazz