3,649 reputation
1217
bio website about.sjrdesign.net
location Boulder, CO
age 31
visits member for 3 years, 1 month
seen Jul 29 at 3:44

Professional geophysicst/astronomer who also writes the blog, "Exposing PseudoAstronomy," and runs the podcast by that name.


Nov
3
comment 2012: Is there some astronomical event happening?
I didn't down-vote your question.
Nov
3
answered 2012: Is there some astronomical event happening?
Nov
2
comment What is a good introductory text to astronomy
With my recent PhD, I've been looking at beefing up my "library." I keep thinking I need to get C&O, but right now it's running around $150 on Amazon, and there are more important books for me to get. Plus, C&O 2nd ed. is ©2006. Astrophysics is a very dynamic field (no pun intended) and I'd expect that a lot of what's in there is likely out of date. I'd guess the fundamentals aren't, but anything relating to any currently active area of research (star formation, CMB, stellar evolution, solar system formation ...) would need some serious revision.
Nov
2
asked What's the most accepted theory for Blue Stragglers These Days?
Nov
1
comment Creating/Downloading a large Galaxy Dataset
I can't help you on this, but I know enough to ask for a clarification: Are you asking for actual star positions for stars in two galaxies? If so, you're not going to get it because it doesn't exist for real galaxies.
Nov
1
comment What is a good introductory text to astronomy
Could you give some more information on background? I mean, are you asking for a general text for an adult who has no science background and is interested in learning more? Are you asking for a book for a child in grade school? Is there something in particular you're interested in learning about (like the solar system, galaxies, cosmology), or a giant all-'round compendium?
Oct
31
comment Is it true that our solar system belongs to another galaxy which collides with the milky way galaxy?
It actually seems like they even got their own pseudoscience wrong. Most people who talk about oscillating above/below the plane of the galaxy in the 2012 crowd say it happens every 26,000 or 13,000 years (full or half a precessional cycle). I have heard this claim before about our solar system's angle to the galactic plane, but it's actually a VERY minor one so I haven't bothered to write about it in my Exposing PseudoAstronomy blog. Maybe I should add it to the list of things to address.
Oct
30
answered Does Mercury have a balmy spot?
Oct
28
comment If Earth Were Filled with a Compressible Fluid and Spun Really Fast, What Hollow Would Form?
Well, it was a thought experiment. That's what I try to do with the puzzlers in my 'cast is to have a thought experiment loosely based off of one small aspect of the main topic of the episode. So I'd like to present the actual solution to it, but I'll then add that it's completely artificial due to everything posted above.
Oct
28
comment If Earth Were Filled with a Compressible Fluid and Spun Really Fast, What Hollow Would Form?
I will definitely mention when I record the solution this weekend, though, that in reality the whole planet would deform and, if spun fast enough, would form a torus.
Oct
28
comment If Earth Were Filled with a Compressible Fluid and Spun Really Fast, What Hollow Would Form?
Ah, okay, I see the duplicate. I swear that wasn't linked before? Or I just didn't see it ... anyway, yeah, while the podcast episode was about hollow Earth, the puzzler question specifically set up the scenario that you have a solid (read: sturdy) shell that won't deform, and then you have material inside that could deform. So, it could be that it's because I asked the question here, but I don't think it's an exact duplicate.
Oct
28
comment If Earth Were Filled with a Compressible Fluid and Spun Really Fast, What Hollow Would Form?
I see you closed this as a duplicate of something else. I tried searching a few times but didn't come up with anything that similar. Could you point me to where this duplicate is?
Oct
28
asked If Earth Were Filled with a Compressible Fluid and Spun Really Fast, What Hollow Would Form?
Oct
28
awarded  Autobiographer
Oct
28
comment Why does Jupiter emit more energy than it receives?
P.S. I'm at work at the moment and this book is at home. I can check more several few hours.
Oct
28
answered Why does Jupiter emit more energy than it receives?
Oct
26
comment Why isn't sunset time in sync with solstice?
I agree that the above isn't quite clear. However, one thing to consider is that the USNO site may not be exactly correct. I went into some astronomical software (Starry Night Pro) and just went to sunrise and sunset times for today (Oct. 26). They differ by 1-3 minutes from what the USNO site says.
Oct
23
comment Why Aren't Saturn's Rings Clumping into Moons?
Thanks. :) I could go on and on and on about my research, but I tried to keep it short ... and I haven't studied the rings in a few years, but the basic physics hasn't changed in that time.
Oct
22
answered Why Aren't Saturn's Rings Clumping into Moons?
Oct
7
answered How could they tell things weigh a sixth of their “Earth weight” on the moon?