they deleloped be being born i think=]
Gravity pulls the asteroids into spheres when they get big enough.
Gravity and heat.
As planets get bigger, the gravitational pull gets bigger. Mass entails gravity.
The Sumerians recorded the positions of the stars and planets and develop a calendar for a couple of reasons. First they believed in a form of astrology where local events could be predicted understanding the heavens. Also, it helped them tell the best time of the year to plant crops.
I think the software was called Grin
this is what i got in my ''journey across time '' book sumerian people watched the skies to learn the best times to plant crops and to hold religious festivals . they recorded the positions of the planets and stars and developed a 12 mouth calendar based on the cycles of the moon
Probably. Astronomers estimated that there are at least 100 billion planets in the galaxy, a good number of which may be similar to Earth. It seems pretty unlikely that Earth would be the only planet to develop life.
Mars is farther from the Sun than the Earth. The requirements to develop life on Mars were far less than on the Earth which had, at the time of the planets' formation, the ideal conditions to develop life.
Johannes Kepler developed the laws of planetary motion.However he was German not Austrian.
Mainly by photosythesis that converted the CO2 in the poisonous early atmosphere, into oxygen.
Bohr developed the Bohr model of the atom with the atomic nucleus at the centre and electons in orbit around it, which he compared to the planets orbiting the Sun
There isn't a zero gravity environment, but if there was, planets wouldn't form. Planets form by very large rock all attracting to each other and gain enough energy that the center pulls the surrounding rock and smooths then into a sphere. So if a zero gravity environment existed. There would be no planets.