Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
SVTPerformance's Chain of Restaurants
Road Side Pub
Betelgeuse is getting active
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="James Snover" data-source="post: 8702327" data-attributes="member: 67454"><p>Estimating stellar distances is not easy. Triangulation becomes more and more difficult the farther away things are, and triangulation is the only method we have. </p><p></p><p>Previous estimates for Betelgeuse's distance were made by ground-based optical observations. HIPPARCOS was a purpose built sattelite that used all kinds of techniques to make the data more reliable, and gave it a much wider base of it's triangle due to it being in orbit. SO you have more reliable dats, taken from a larger scale, which yields a more accurate answer. That the original estimate was off by 200-light-years, in the cosmic scale of distance, is hardly any real difference at all. </p><p></p><p>But when you are on a planet, and a big star goes up, the inverse square law is your best friend, and a third of it just left town.</p><p></p><p>As for the rest of it, that we think Betelgeuse is going to blow any moment between now and the next thouasnd or so years, the short answer is we're on pretty solid theoretical ground with that. That conclusion is not in dispute by anyone in the astronomical and physical sciences.</p><p></p><p>Jim Snover</p></blockquote><p></p>
[QUOTE="James Snover, post: 8702327, member: 67454"] Estimating stellar distances is not easy. Triangulation becomes more and more difficult the farther away things are, and triangulation is the only method we have. Previous estimates for Betelgeuse's distance were made by ground-based optical observations. HIPPARCOS was a purpose built sattelite that used all kinds of techniques to make the data more reliable, and gave it a much wider base of it's triangle due to it being in orbit. SO you have more reliable dats, taken from a larger scale, which yields a more accurate answer. That the original estimate was off by 200-light-years, in the cosmic scale of distance, is hardly any real difference at all. But when you are on a planet, and a big star goes up, the inverse square law is your best friend, and a third of it just left town. As for the rest of it, that we think Betelgeuse is going to blow any moment between now and the next thouasnd or so years, the short answer is we're on pretty solid theoretical ground with that. That conclusion is not in dispute by anyone in the astronomical and physical sciences. Jim Snover [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
SVTPerformance's Chain of Restaurants
Road Side Pub
Betelgeuse is getting active
Top