This is because they block a larger amount of light. If the light source is close to the shadow, this also leads to a larger shadow. Some shadows, like the palm trees, change in size. This is ...

In a collaboration between process engineering and photonics at TU Wien (Vienna), this problem has now been solved using a very special type of light source: terahertz radiation from a quantum ...

The particular extraterrestrial body lies beyond the solar system, some 900 light-years away in the constellation Puppis. The ...