Dating systems history internet dating for professional people

Over millions of years, they gradually shaped themselves into solid planetesimals, and later protoplanets with their own unique orbits.

Astronomers call all this smashing and joining together accretion.

Plus, incredibly massive meteorites and asteroids frequently slammed onto the surface — creating even more heat. Heavier material sank to the bottom, lighter stuff rose to the top. This transformation created the Earth's layered core and mantle, crust, and atmosphere. Shifting, sliding, and colliding tectonic plates "surf" atop its semi-molten mantle.

This relentless drifting speeds along at the rate of fingernail growth, yet causes mountains to rise, volcanoes to erupt, and earthquakes to strike. These questions burned and plagued astronomers for millennia.

And four years to reach Proxima Centauri, the next nearest star. Early microbes, in their struggle for life, clashed with and consumed hydrogen gas. These microbes evolved into prokaryotes and adapted further, finding energy in sunlight.

Through their observational evidence, and by using the newly invented telescope, they produced data and logic supporting a Sun-centered, heliocentric model of the Solar System.It took billions of years for the Earth to form and settle into orbit around the Sun. To study the movements of heavens back then, you would look up into the sky.You would see the Sun and stars revolve around the very spot where you were standing, the Earth — just as Ptolemy did some 1,900 years ago.So even though a star might appear extremely dim, if it had a long period it must actually be extremely large.The star appeared dim only because it was extremely far away.

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