Author Topic: Episode 34: Ladder to the stars  (Read 3291 times)

Offline bn

  • Titanium Physicist
  • Administrator
  • Godzilla!!!
  • *****
  • Posts: 1065
  • Karma: +1/-0
  • Compressing Hearts, Super Robo Style
    • View Profile
    • The Titanium Physicists Podcast
Episode 34: Ladder to the stars
« on: June 24, 2013, 08:54:21 AM »
On this Ti-phy episode, we talk about the cosmic distance ladder.

How, in other words, we can tell how far objects are away from us.

there are a variety of ways... parallax, Cepheid Variable stars, the Hubble constant and Redshift.

this episode is pretty fun.
Titanium Physicists has a pro-bee-analogy agenda. That's certainly no secret.

Offline Amy

  • Little Puffin
  • **
  • Posts: 5
  • Karma: +0/-0
    • View Profile
Re: Episode 34: Ladder to the stars
« Reply #1 on: June 25, 2013, 05:03:44 PM »
I am confuse.  The last couple episodes you've been using Dark Energy in a manner that I thought was Dark Matter.  I think I remember you saying Dark Energy makes up approximately 70% of the universe, but I thought that's what Dark Matter was?

Offline bn

  • Titanium Physicist
  • Administrator
  • Godzilla!!!
  • *****
  • Posts: 1065
  • Karma: +1/-0
  • Compressing Hearts, Super Robo Style
    • View Profile
    • The Titanium Physicists Podcast
Re: Episode 34: Ladder to the stars
« Reply #2 on: June 25, 2013, 05:30:01 PM »
nope.
they're different.

dark matter= particles we can't see. probably don't react to electromagnetic fields.

dark energy = probably the cosmological constant.
Titanium Physicists has a pro-bee-analogy agenda. That's certainly no secret.

Offline Amy

  • Little Puffin
  • **
  • Posts: 5
  • Karma: +0/-0
    • View Profile
Re: Episode 34: Ladder to the stars
« Reply #3 on: June 25, 2013, 10:16:29 PM »
Well that was my understanding, that dark matter is what is theorized to explain why our model of gravity doesn't really match what we see when we look at galaxies, and dark energy is what's causing The universe's expansion to accelerate.  Mabe I need to listen to the last 2 eps again cause I can usually figure out what exactly is meant if I think about it enough. Stupid work distracting me from learning science :P

Offline bn

  • Titanium Physicist
  • Administrator
  • Godzilla!!!
  • *****
  • Posts: 1065
  • Karma: +1/-0
  • Compressing Hearts, Super Robo Style
    • View Profile
    • The Titanium Physicists Podcast
Re: Episode 34: Ladder to the stars
« Reply #4 on: June 26, 2013, 03:42:10 AM »
*thumbs up*
Titanium Physicists has a pro-bee-analogy agenda. That's certainly no secret.

Offline jfpohl

  • talky crow
  • ****
  • Posts: 32
  • Karma: +0/-0
    • View Profile
Re: Episode 34: Ladder to the stars
« Reply #5 on: July 14, 2013, 07:40:53 PM »
Ben,
I really enjoyed this podcast.
Question: Before Edwin Hubble made his observations, did any astronomers theorize that nebulae (the old term) could potentially be something like galaxies?  I have always been curious about that.
"Doctors will have more lives to answer for in the next world than even we generals." Napoleon Bonaparte

Offline bn

  • Titanium Physicist
  • Administrator
  • Godzilla!!!
  • *****
  • Posts: 1065
  • Karma: +1/-0
  • Compressing Hearts, Super Robo Style
    • View Profile
    • The Titanium Physicists Podcast
Re: Episode 34: Ladder to the stars
« Reply #6 on: July 14, 2013, 10:06:26 PM »
good question.

i dont know?
Titanium Physicists has a pro-bee-analogy agenda. That's certainly no secret.

Offline jfpohl

  • talky crow
  • ****
  • Posts: 32
  • Karma: +0/-0
    • View Profile
Re: Episode 34: Ladder to the stars
« Reply #7 on: July 15, 2013, 01:46:08 PM »
I had some downtime this afternoon, so I looked it up.  Vesto Slipher looked at the light spectrum of some nebulae and found they matched the spectrum of the Pleiades Open Cluster (suggesting that nebulae were full or stars).  However, I don't think he connected this finding as possible galaxies.  This occurred in 1912.
I'm not an astronomer, so I hope that makes sense.     :(

I also read that Slipher hired Clyde Tombaugh and supervised some of the work leading to Pluto's discovery.  My only relation to that aspect is that I saw the original photographic plates that demonstarted Pluto during a road trip 5 years ago.  That was cool.
"Doctors will have more lives to answer for in the next world than even we generals." Napoleon Bonaparte