abstract engineer blogspot

  • Subscribe to our RSS feed.
  • Twitter
  • StumbleUpon
  • Reddit
  • Facebook
  • Digg

Thursday, 5 May 2011

Could We Really See Dyson Spheres?

Posted on 18:10 by hony
Both Dyson himself, as well as the author of this article, Dr. Dave Goldberg, seem to believe the best way to discover a civilization that has enshrouded a star in a Dyson sphere is to look for infrared radiation in the neighborhood of 10 micrometers:
Everything that takes in energy ultimately re-radiates it. This is true, on average, of the earth, for instance, and if it weren't we'd heat up at an alarming rate. Likewise, you absorb light and take in fuel and as a result, you heat up and glow in the dark, though not in the wavelength range that our eyes are sensitive to. You glow in the infrared rather than the visible. This is how night-vision goggles work. It's also how the Spitzer Space Telescope, which went up in 2003, works. Dyson knew that his eponymous spheres would be heated to (roughly) room temperature, just by assuming that all creatures are as fond of liquid water as we are. At those temperatures, the Dyson Spheres should all be radiating at approximately 10 micrometers, right in the middle of the range that Spitzer is sensitive to. Even if there were only a few Dyson Spheres in our Galaxy and Spitzer would still be able to pick them out. After all, they're still radiating the energy of an entire star.
I guess I'm not sure why they assume that a civilization that is technologically advanced enough to build a Dyson Shell (we're talking the shell here...a sphere isn't hollow) would just let all that infrared radiation bleed into space and not utilize it.
Yes, yes, the conservation of energy requires that eventually the power of the star which is surrounded by the shell must eventually leave the shell. But why does it have to leave by passive heat radiation? Wouldn't a civilization be better suited to converting it into...I dunno...a laser that they could fire at departing star ships to accelerate them? Or at approaching star ships to decelerate them?
Certainly, it is unlikely they would keep the outside of the Shell at absolute zero. But the danger in predicting the methods and engineering of an alien megastructure are that we presume to be able to forward predict the technologies - and lack of them - that an alien species would use.


_
Email ThisBlogThis!Share to XShare to Facebook
Posted in | No comments
Newer Post Older Post Home

0 comments:

Post a Comment

Subscribe to: Post Comments (Atom)

Popular Posts

  • 5 Years
    Five years ago tomorrow I started this blog. I was working at a job I didn't particularly like nor found mentally fulfilling, and the bl...
  • This Tesla Love-Fest Has Got To End
    Over at The Oatmeal, a popular online comic, there's a sprawling, gushing graphic about Nikola Tesla. Inside it, Edison is referred to ...
  • I promise to stop writing about STEM soon. Just not yet.
    Imagine you are a tech company that makes widgets. You've gotten a factory in China to make the parts for the widgets for a tiny amount....
  • A Single Button
    When your grandchildren see F-35 fighter jets streaking through the skies above our fair country, probably at air shows and hopefully not ...
  • The Worst Science Idea of 2010 - Genspace Now Open For Disaster
    Here's the idea : Let's build a lab where anyone, literally anyone, can come and tinker with microorganisms. Better yet, let's m...
  • Hack The Body
    I have a short lunch today so I must be brief, but I wanted to point to these two articles, both published today: Monkey controls robot hand...
  • Where is the artificial gravity research?
    Just asking. _
  • TAE's DIY Iron Man Arc Reactor
    So I got the itch to create. With Halloween coming up, and the Iron Man 2 DVD release last week, I felt compelled to finally get off my hind...
  • Climate Science vs. Climate Economics
    Maybe you are getting tired of the climate ranting I'm doing. If so, here's David Roberts : Or contemplate this: To reach even the m...
  • Zomney
    For those of you who don't know who Joss Whedon is, he most recently directed The Avengers. _

Blog Archive

  • ►  2013 (41)
    • ►  July (4)
    • ►  June (7)
    • ►  May (4)
    • ►  April (6)
    • ►  March (8)
    • ►  February (8)
    • ►  January (4)
  • ►  2012 (91)
    • ►  December (8)
    • ►  November (5)
    • ►  October (11)
    • ►  September (8)
    • ►  August (8)
    • ►  July (3)
    • ►  June (10)
    • ►  May (12)
    • ►  April (3)
    • ►  March (9)
    • ►  February (10)
    • ►  January (4)
  • ▼  2011 (205)
    • ►  December (11)
    • ►  November (14)
    • ►  October (10)
    • ►  September (18)
    • ►  August (18)
    • ►  July (10)
    • ►  June (15)
    • ▼  May (11)
      • Friday Poetry Burst
      • Harrison Schmitt is right for all the wrong reasons.
      • Joplin
      • We put a man on the moon 40 years ago, so why can'...
      • Was the Apollo Progam an Outlier To America's Hist...
      • Self-Censorship
      • Creative Hiatus
      • Friday Poetry Burst
      • Quote of the Day
      • Could We Really See Dyson Spheres?
      • Quote for the Day
    • ►  April (32)
    • ►  March (24)
    • ►  February (16)
    • ►  January (26)
  • ►  2010 (163)
    • ►  December (20)
    • ►  November (20)
    • ►  October (23)
    • ►  September (28)
    • ►  August (28)
    • ►  July (29)
    • ►  June (15)
Powered by Blogger.

About Me

hony
View my complete profile