Why does the solar nebula theory imply planets are common? a. Planets formed fro
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Why does the solar nebula theory imply planets are common?
a. Planets formed from the envelope of the Sun, ejected at the time of hydrogen fusion ignition. Stars commonly eject their envelopes. b. Planets formed from the spiral arms of matter encountered around the Sun. Most main-sequence stars pass spiral arms dozens of times in their lives. c. Planets formed from the Sun’s past binary partner star. Binary systems with different masses and evolution rates are common. d. Planets formed from the disk of gas and dust that surrounded the Sun, and such disks are common around young stars.Explanation / Answer
(D)This option is correct because Planets in our solar system and solar system of other stars are commonly formed by the solar nebula.Solar nebula is the disc shaped cloud of gas and dust which are left after the formation of star.This disc also has some angular momentum and orbotting its star.This dust is composed of mainly Hydrogen and Helium.
Particles of this Solar nebula starts to clum together by gravitational attraction.After a long time Such accumulation of particles formed small size objects commonly called Planetesimals,which has diameter about some thousand meters.As more time passes these Planetesimals collide with each other and join together and formed larger bodies.This process is called acceration.Due to acceration process finally planet formed.
Since solar nebula is common around early stars so planets are also very common to form..
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