Starship Asterisk*

There was a recent result claiming all galaxies rotate approximately once per billion years. So no galaxy has rotatedmore than 15 times. So if they're busy colliding and devouring, those timescales must be much quicker than the spiraling... which seems intuitively wrong to me. How do the spirals sta...

For comparison, what if all the planet's carbon was compressed into a single diamond: https://www.flickr.com/photos/rwfaves/7220975240/

I started a Twitter account for my HDEV questions
https://twitter.com/HDEVpro

i'm looking for an active forum that shares hdev status updates and especially educational cloud patterns. when hdev first got running, there was a predictable cycle of the four camera views. this has since been abandoned and you never know what you'll get-- the nadir cam almost never shows up anymo...

Newest image: http://www.sciencenews.org/view/generic ... moon_crash

How wide was the flash? Very important question! As best I can guestimate using Google Earth's Moon map (which appears inverted compared to this APOD image), the round crater below the flash is about ten miles wide, so the flash is one-half to one mile in diameter. And come to think of it, that wou...

robotwisdom wrote:How wide was the flash?

Very important question!

As best I can guestimate using Google Earth's Moon map (which appears inverted compared to this APOD image), the round crater below the flash is about ten miles wide, so the flash is one-half to one mile in diameter.

The 'reset' button on the site-registration form is dangerously ambiguous-- I expected it to give me a more readable captcha. (I've never seen a submission form with that sort of reset before.) Some clarification of how to get a better captcha is needed. 'Save' vs 'Submit' is also unexpected. You mi...

How wide was the flash?