In addition to long-life radionuclides, a number of short-life radionuclides were present in the primitive solar system. Most of them have half-lives below a few million years. They have been …
There are two methods for determining the absolute age of a rock, so-called radiochronology: The isochronous method The cosmogenic nuclide method These two methods are based on natural nuclear disintegration …
As we said in the introduction, you have to prepare your observation before looking at the sky. At first it is not easy to recognize the stars and find the …
During the night you will not only see stars in the sky but many other objects: The Moon: every month, for about 25 days, the Moon is visible in the …
In the past it has happened that some meteorites are so big and so heavy that they violently hit the Earth forming huge craters several kilometers in diameter! In fact …
Most asteroids orbit very far from the Earth, between Mars and Jupiter. Some debris however or dust released by the tail of comets can cross the Earth at the chance …
From time to time we see comets in the sky. Like asteroids, they are large, dusty, icy rocks several hundred meters long and a few kilometers in diameter. There are …