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Encounter Hypothesis: One of the earliest theories for the formation of the planets was called the encounter hypothesis. In this scenario, a rogue star passes close to the Sun about 5 billion years ago. Material, in the form of hot gas, is tidally stripped from the Sun and the rogue star.
The Encounter Hypothesis (Buffon 1745) Scenario: 1. A “near miss” encounter occurs between the Sun and a passing star. 2. Material is pulled from the stellar surfaces by tidal forces. 3. Material cools and condenses to form planetary bodies. Principal Shortcoming: This Requires a highly unlikely event
The Encounter Theories of the Origin of the Solar System was published in A Source Book in Astronomy and Astrophysics, 1900–1975 on page 182.
The Solar System travels alone through the Milky Way in a circular orbit approximately 30,000 light years from the Galactic Center. Its speed is about 220 km/s. The period required for the Solar System to complete one revolution around the Galactic Center, the galactic year, is in the range of 220–250
The nebular hypothesis is the idea that a spinning cloud of dust made of mostly light elements, called a nebula, flattened into a protoplanetary disk, and became a solar system consisting of a star with orbiting planets [ 12 ].
Since the seventeenth century, philosophers and scientists have been forming hypotheses concerning the origins of our Solar System and the Moon and attempting to predict how the Solar System would change in the future.
1) The document discusses different theories of planetary formation - the encounter theory, planetesimal theory, tidal theory, and nebular theory. 2) It provides an activity where the student must arrange events of planetary formation in chronological order based on the planetesimal and tidal theories.
