This video is breathtaking….
Yeah. Really. People believe that. It takes the whole moon landing hoax to the next level.
Okay, I want to restrain myself, because I could go off on this all night and I think most readers will understand these things anyway….
Not only can you detect the radio waves from satellites, but you can actually see them. You can see them with the naked eye and you can make out details of large ones with a telescope.
In space there is almost no atmosphere, so the temperature of the few molecules bouncing around does not matter. Space has no ambient temperature. The temperature of an object depends on the rate it radiates heat, whether it is absorbing heat from the sun and whether it produces its own heat. Indeed, a thermometer, with no internal heating, placed in space, will get very cold because it radiates heat faster than it is absorbed. However, equipment that generates heat can get very hot because there is no convection cooling. In fact, thermal management of spacecraft is a very complex engineering challenge.
A rocket engine does not need air to push against. It does not need anything to push against. Its own exhaust is what it is pushing against. Really, you could set off a rocket in a vacuum chamber if you do not believe me. Air is not needed for thrust or control.
Solar cells are not used on spacecraft because of environmental concerns. The sun is very intense in space and provides a lot of power. Solar cells last much longer than fuel cells or batteries and you can’t use a combustion motor in space without bringing along oxygen. Although nuclear power sources have also been used, for most applications in the vicinity of earth, solar cells are the most economical and easiest way to provide necessary power to a spacecraft.
We have tons of photographs of earth from satellites. How many do you want? Most are from low earth orbit and therefore, only a portion of the earth is seen. You need to go much further away to see the whole thing, but there are plenty of those too, taken from deeper space missions. The “Blue Marble” taken during Apollo 17 is iconic as it was one of the earliest full disk pictures of the earth (though not actually the first) and got a lot of attention. There are many others, but it is one of the best know.
The guy talking about radio propagation has it all wrong. Sky wave propagation only applies to HF signals, and even then it’s fickle and depends on the ionospheric conditions. These signals lack the high bandwidth needed for things like television. Satellites use microwave frequencies, which are also very directional and usually require a high gain antenna, like a dish. This is why you get different signals when pointed at different satellites and none when pointed at empty parts of the sky.
Also, satellites really haven’t gotten “larger” or “smaller.” The sizes are highly varied. Indeed, the first satellites were small, because of limited rocket technology. By the late 1960′s, satellites the size of a bus could be launched and were used for things like surveillance. Some payloads, like Skylab, were enormous. Today some satellites are very big, but the miniaturization of electronics has also allowed some very small satellites to be useful.
Finally, it is possible to find pictures of satellites that are real photographs. However, the issue is that in order to photograph a satellite in detail, you need another satellite flying near it with a camera, and we don’t usually have that. Illustrations are thus easier to make. Also, if you want to show several satellites in relation to the earth, you have to use an illustration, because it’s obviously not going to be to scale. You want a photograph of the entire GPS constellation flying around earth? Not possible. The satellites are too small in relation to the earth.
It’s amazing how little these people understand of basic concepts and how poor they are at researching and educating themselves. Yet they will declare with authority that everyone else is one of the “Sheeple.”
Yeah. I have a basic understanding of physics and radio communications. I must be bought and paid for by the government