ANSWERS: 5
  • Current theories would be that all the major planets formed at the same time, when the Solar System condensed out of a cloud of gas about 4.5-4.7 billion years ago.
  • A violent increase in the pressure and temperature of our young, early Sun created tremendous chain reactions that did not just cause it to start shining, it caused the Sun to violently expand to many times its former size and explode. The explosion sent its matter hurtling at great speed outward in every direction, in all sizes and speeds, both gases and molten solids, from the size of small particles to the size of the giant planets. Some of it was hurled out at such a great velocity that it was lost forever to other regions of the galaxy. Much of the debris eventually fell back into the Sun. Other debris, after it had expended its outward energy and had not broken free of the Sun's gravity, began to fall back toward the Sun, missing it due to the Sun's great galactic speed and changing position. This is the matter that became the planets, moons, comets, asteroids of our solar system. ref: http://novan.com/solar.htm
  • GOD created everything
  • What I present here, is the current widely accepted model, known as the nebular hypothesis. The oldest planet should be Jupiter or Saturn. 1) The outer planets formed before the inner planets: "1 × 10^5–7 years Outer planets form. By 107 years, gas in the protoplanetary disc has been blown away, and outer planet formation is likely complete. 1 × 10^7–8 years Terrestrial planets and the Moon form. Giant impacts occur. Water delivered to Earth." 2) "Uranus and Neptune are believed to have formed after Jupiter and Saturn did": "T Tauri stars like the young Sun have far stronger stellar winds than more stable, older stars. Uranus and Neptune are believed to have formed after Jupiter and Saturn did, when the strong solar wind had blown away much of the disc material. As a result, the planets accumulated little hydrogen and helium—not more than 1 Earth mass each. Uranus and Neptune are sometimes referred to as failed cores. The main problem with formation theories for these planets is the timescale of their formation. At the current locations it would have taken a hundred million years for their cores to accrete. This means that Uranus and Neptune probably formed closer to the Sun—near or even between Jupiter and Saturn—and later migrated outward (see Planetary migration below)." 3) "The planets were originally believed to have formed in or near the orbits at which we see them now. However, this view has been undergoing radical change during the late 20th and early 21st centuries. Currently, it is believed that the Solar System looked very different after its initial formation: several objects at least as massive as Mercury were present in the inner Solar System, the outer Solar System was much more compact than it is now, and the Kuiper belt was much closer to the Sun." Source and further information (all quotes): http://en.wikipedia.org/wiki/Formation_and_evolution_of_the_Solar_System
  • Uranus (suprised?)

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