network profile
| bio | website | about.sjrdesign.net |
|---|---|---|
| location | Boulder, CO | |
| age | 30 | |
| visits | member for | 1 year, 6 months |
| seen | Apr 29 at 17:08 | |
| stats | profile views | 55 |
Professional geophysicst/astronomer who also writes the blog, "Exposing PseudoAstronomy," and runs the podcast by that name.
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Aug 3 |
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Is there any evidence for the claim that the moon was once part of the Earth? @dagorym: I run a blog called "Exposing PseudoAstronomy," so potential misinterpretations and an eye on falsified ideas that some people still cling to are always in my mind. |
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Aug 3 |
answered | How did micrometeorite flux change with the age of the solar system? |
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Aug 3 |
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How did micrometeorite flux change with the age of the solar system? Note: Your subject line is different from your question. |
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Aug 1 |
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Is there any evidence for the claim that the moon was once part of the Earth? Might be beating a dead post, but I feel I should point out that this is in answer to "parts of the moon came from a primordial Earth," NOT that "the moon split from Earth." These are VERY different things, the first (and what the answer is) being the "Big Splash" hypothesis where a Mars-sized object struck Earth and formed the moon, versus the fission hypothesis where Earth was spinning really fast and spawned the moon (or the latest "Big Burp" where an early explosion within Earth blasted material out to form the moon). |
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Jul 31 |
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When will Enceladus run out of water? An important point to make here is that we also have no idea (a) how long this has been going on, (b) how long it will continue, and (c) if the rates have been steady. So, any estimate at the moment is going to be based on a steady-state which is unlikely to be accurate. |
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Jul 30 |
answered | The orbit of 2010 TK7 |
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Jul 30 |
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How is the shape of the universe measured by scientists? I highly recommend reading the book "Sphereland" by Dionys Burger. It is a "sequel" to the much older book "Flatland" by Edwin Abbott that discusses this issue from the standpoint of going down a dimension -- so if we lived in 2D, how would we measure curvature of our 2D universe in higher dimensions when we can't experience them. |
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Jul 29 |
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Next crescent moon? Out of curiosity, how does the calendar define the "first appearance of crescent moon"? Practically speaking, I have trouble finding the moon until it's around 3-4%, but I know some who can find it at 1%. |
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Jul 29 |
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Next crescent moon? Good point, Andrew. Though scientifically speaking, unless you are at the exact moment of deepest totality during a solar eclipse, the moon can never be fully new, there will always be the slightest bit of a crescent. Checking Starry Night Pro, it looks like tomorrow at about 12:40PM MDT (I think we're -7 GMT, so 7:40PM GMT) is the moment of the New Moon. |
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Jul 29 |
answered | Next crescent moon? |
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Jul 28 |
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The orbit of 2010 TK7 The Bad Astronomer has a good article on this that I think will explain the oscillation to your satisfaction. Check out blogs.discovermagazine.com/badastronomy/2011/07/27/… . I also couldn't find a term "visous" in the BBC article - I was going to suggest you meant "viscous." |
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Jul 25 |
answered | Which citizen-science astrophysics and astronomy projects currently exist? |
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Jul 23 |
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Maximum depth for bacteria on rogue planets Please clarify. "Reach" by what mechanism? And survive? |
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Jul 23 |
answered | Vesta dwarf planet status |
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Jul 23 |
answered | Why did the asteroid belt between Mars and Jupiter form as it did? |
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Jul 22 |
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What will the universe look like for anyone falling into a black hole? @dagorym - I expanded the answer. |
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Jul 20 |
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What is so special about iron? Thanks jball - changed it. |
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Jul 20 |
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What will the universe look like for anyone falling into a black hole? Thanks, Andrew. Yeah, I meant if you could "stand stationary." I know a lot of folks say that the singularity would get larger and larger, but my understanding is that the singularity is "where God divided by zero" ... in other words, Relativity doesn't work, and we really don't know what to expect. Obviously light can't escape it (we're inside the event horizon), and the last I read, it's an infinitely small point (or infinitely thin ring). How does a geometric point fill your view? |
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Jul 19 |
answered | Why aren't space probes like New Horizons sped up in space? |
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Jul 19 |
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Is Jupiter a failed star? Thanks, Warrick, That number was coming to mind, but I couldn't remember where I heard it. What throws it off, though, is that people are reporting exoplanets with a minimum mass of up to 20 Jupiter masses. So, yeah ... |
