Spheres on Mars, Moon and Earth

The terrestrial planets Mercury, Moon and Mars have similar
surfaces formed mostly during the first billion years of the Solar system.
The surfaces of Venus and Earth are different; new and reformed mostly
in the last billion years (The New Solar System 1999). So we should find
the explanation of the Mars spheres from the Moon and not from ocean
bottoms of Earth. The Moon surface was studied
30 years ago, and 382 kg of stones were brought to Earth.
A surprise finding was that there were volcanic glass beads
all over. They were both volcanic and meteoric impact-generated. As molten
ejected stone material cooled down under the surface tension force alone,
they fell back to Moon as spheres. These spheres on Mars are probably
similar in origin. They might be bigger in size. If so, it might be that
the
thin atmosphere of Mars slowed also the bigger, up to 5 mm, beads enough
to
prevent them from shattering when hitting the Mars surface. Another
difference
seems to be that compared to the smooth glass beads of Moon, the
Mars-spheres look more like
sand-blasted glass.

Antti Järvi