A supernova is a star that suddenly ignites, becoming millions of times brighter. So brilliant that it can be seen in broad daylight; but very quickly it weakens. It is a rather rare sight, because this explosion marks the end of a big star. The last of our galaxy was seen by Kepler in 1604.
How many species of algae are there?
There are 7000 of them, most of whom live near the shore where they can cling to the rocks or the bottom with a special foot. Attached to this foot, the fronds oscillate in the water.
Most brown algae live in cold wate…Read More
Which plants have no roots, leaves or flowers?
Lichens, which are an assemblage of algae and mushrooms living together. Some lichens grow in patches on stones and trees.
They grow very slowly and live very old (10,000 years). They are among the oldest living things and s…Read More
Do you know where the black forest is?
In the south of Germany, the Black Forest (Schwarzwald in German) is a mountainous region covered with coniferous forests. The Danube takes its source and the Rhine runs along its edge to the west. With its trees with dark l…Read More
Why does the Puffball explode?
The giant Puffball is a big round mushroom. Its skin is paper-thin, swollen from the inside and explodes when a drop of water touches it, leaving a cloud of spores.
Most mushrooms produce a fruit, which is the part we s…Read More
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