Medienproduktion

Eintrag vom: 23.02.2013.

While walking my dog in the evenings during the holiday season this year I noticed I was unable to focus on and clearly resolve the dark blue LEDs in Christmas tree lights or fairy lights. For all the other colours I could resolve the shape and even the texture of the individual light bulbs but with these deep royal blue LEDs all I could see was a hazy blur. Why is that?

 

Over the past 100 years and much more so in the past 40 years medical science has been able to save an increasing number of babies (and mothers) being born that would have not survived if they had been born at any other time in human history. Is this having an impact on the human gene pool?

 

Do humans moult like other hairy animals such as cats and dogs? In other words does our hair get thicker in winter while we moult in the summer? If we don't moult did we once have this function and have we since lost it through evolution?

 

Most of them are very far away and most of them are either very close to the sun or out beyond Neptune. This one was conveniently located and we could fly by it at a pretty low velocity for interplanetary speeds and get a sample. But this comet is also interesting because it's only been in its present orbit since 1974.

 

Instructions This experiment involves flames and very hot metal which may stay hot for longer than you expect. Please make sure the experiment is done by a responsible person and you take sensible precautions. Straighten out four paper clips to get a feel for how stiff they are. Put one of these to one side so that you can come back to it later. Take one paperclip and staying at one place ...

 

How the did astronauts return from the Moon? How did the spacecraft launch back from the Moon to Earth?

 

So flies can do it but far from all will manage this feat. Seven kilometres is not only a considerable distance to smell something for a tiny fly simply traveling 7 kilometres is a major effort taking several days. Even so flies are able to detect a smell of rotting meat over long distances.

 

The next nearest galaxy to our own is the Andromeda galaxy and that's about 3 million light years away so the light that's coming from there is already 3 million years old.

 

So the questioner is right. If we think about aliens that were say living in the Andromeda galaxy. So the Andromeda galaxy is our nearest galaxy and it is a few million light years away. And so what that means is that any signal that those aliens could measure it would have to travel at the speed of light to get there.

 

The nearest galaxy to our galaxy the Milky Way is called Andromeda. It's about 2 million light years away and we think it looks very similar to our own galaxy. It's difficult to know what our own galaxy looks like because we're in it but calculations show that it's a flat spiral disc shape.