Search found 1717 matches

by Tom Ligon
Wed Jul 26, 2017 1:59 pm
Forum: General
Topic: Sell The Whitehouse to Trump
Replies: 432
Views: 26556

Re: Sell The Whitehouse to Trump

To tie it all together, between Trump and McCain, which one has ever experienced the business end of a steam catapult, or knows more about aircraft carriers than a fifth-grader?
by Tom Ligon
Tue Jul 25, 2017 9:48 pm
Forum: General
Topic: Sell The Whitehouse to Trump
Replies: 432
Views: 26556

Re: Sell The Whitehouse to Trump

We are an important check on the powers of the Executive. Our consent is necessary for the President to appoint jurists and powerful government officials and in many respects to conduct foreign policy. Whether or not we are of the same party, we are not the President’s subordinates. We are his equa...
by Tom Ligon
Tue Jul 25, 2017 1:46 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

There's a conundrum with going to telescopes with more and more "power". Since our goal is to be able to resolve smaller objects, we typically use the larger aperture for more resolution instead of more light gathering for faint objects. This means we're narrowing the field of view. Observ...
by Tom Ligon
Tue Jul 25, 2017 3:10 am
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

I think the James Webb or larger. We're still thinking small. I have been willing for some years to let Hubble go. Its old. We need a new one. The Webb will be a good instrument but they screwed around with it, wound up spending more by trying to delay it. The price is badly bloated. I think we shou...
by Tom Ligon
Mon Jul 24, 2017 1:35 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

The telescopes I'd like to see in space would be far too large to launch from Earth in one piece and deploy in orbit. They'd have to be constructed in space. And probably in deep space, as tidal effects in low Earth orbit would distort the structure far too much. And we will. That could be delayed ...
by Tom Ligon
Mon Jul 24, 2017 1:29 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

The thing about shiny metal is that it is not the size of the object that counts, its how good a mirror is it. If I were to hold up a playing card ten miles away from you, you would not see it. You would not see it with a good pair of binoculars. With a good telescope, you might make out that I was ...
by Tom Ligon
Sun Jul 23, 2017 12:19 am
Forum: General
Topic: Sell The Whitehouse to Trump
Replies: 432
Views: 26556

Re: Sell The Whitehouse to Trump

Just wondering. Does the Gerald Ford still have the EMALS electro-magnetic catapults installed, or did the yank them out and install steam catapults, per Trump's orders? If they did go to steam, I presume the complement of aircraft will be F4's, F-14's etc. Because the latest aircraft being added to...
by Tom Ligon
Sat Jul 22, 2017 11:04 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

Why would metal objects only reflect light back to their sun? My thinking was, they would be like our satellites, with shiny metal structures. There is no particular direction you need to reflect the sunlight, you just need to keep the satellite cool. If you sit in your back yard on a clear night fo...
by Tom Ligon
Fri Jul 21, 2017 1:38 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

Against the cold background of space IR should work splendidly . As of 2017, the Voyager 1 space probe is about 19 billion kilometers away from Terra and its heat signal is a pathetic 20 watts But as faint as it is, the Green Bank telescope can pick it out from the background noise in one second fl...
by Tom Ligon
Fri Jul 21, 2017 1:59 am
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

10 uM is indeed a fun part of the spectrum, and thermal imagers have too many uses to list. I've tracked down electrical shorts and spotted leaks. Also where the cat threw up. But getting back to satellite junk, is IR the way to spot it? Using a space telescope, I can imagine that planets might be r...
by Tom Ligon
Wed Jul 19, 2017 4:00 am
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

As a kid, I used to worry that somehow people might see my farts. We now have the technology. My little home survey camera is sufficiently sensitive to show the difference between my bee-stung hand and the other hand. The stung area felt warmer, and the camera verified it. It will show a 0.1C temper...
by Tom Ligon
Mon Jul 17, 2017 7:18 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

I only have the single-band instrument, which works at around 10 microns, IIRC. That makes it a good instrument for seeing water vapor. It can image clouds in the dark, and steam looks like flames. But it also blinds it under humid conditions. FLIR has another one out that works in a band sensitive ...
by Tom Ligon
Mon Jul 17, 2017 5:25 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

I've played with the thermal imager a lot. Pointing it to the sky can be quite an education. The full moon should be quite toasty, as much as 123 C (253 F). Yet, the thermal imager has trouble picking it up. The first time I tried it, I got no indication at all. That was a summer observation. I trie...
by Tom Ligon
Mon Jul 17, 2017 5:11 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

I have heard that bees body heat is also used to defend their hive. If an intruder inters the hive, the bees will surround the intruder and raise their body temperature, effectively baking the intruder in a bee oven. With the additional advantage that the bees live thru this. If they sting, they di...
by Tom Ligon
Sun Jul 16, 2017 11:04 pm
Forum: General
Topic: Stuff in Space
Replies: 39
Views: 570

Re: Stuff in Space

One of its most amusing moments is when Nobel Prize winner and chief scientist John Mather considers whether Webb's optics could sense the heat energy of a bumblebee at a distant equivalent to that of the Moon. It could, he concludes: "You have to take a time exposure to get something that sen...

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