What are planetesimals and protoplanets?
is that planetesimal is any of many small, solid astronomical objects, that orbit a star and form protoplanets through mutual gravitational attraction while protoplanet is an astronomical object, approximately the size of the moon, formed from the mutual gravitational attraction of planetesimals; they are thought to …
What is the Protosun hypothesis?
The protosun (original or first sun) contracted to form a huge rotating gas cloud (primeval solar nebula). As the gas cloud cooled, it contracted even more and the size of the Sun became smaller. As the Sun continued to contract and cool, more rings of matter, like ripples in a pond, moved out from the Sun.
What is the difference between nebular hypothesis and solar nebula theory?
The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems). The widely accepted modern variant of the nebular theory is the solar nebular disk model (SNDM) or solar nebular model.
What is the difference of nebular hypothesis and protoplanet hypothesis?
The Encounter Theory suggests that the Solar System formed as a result of a near collision between a passing star and the Sun. The Protoplanet Theory is a modified version of the nebular hypothesis stating that the Solar System started from a nebula that was disrupted which led to the formation of protoplanets.
What are called planetesimals?
Planetesimals /plænɪˈtɛsɪməlz/ are solid objects thought to exist in protoplanetary disks and debris disks. Per the Chamberlin–Moulton planetesimal hypothesis, they are believed to form out of cosmic dust grains. Believed to have formed in the Solar System about 4.6 billion years ago, they aid study of its formation.
What does the solar nebula theory explain?
Currently the best theory is the Nebular Theory . This states that the solar system developed out of an interstellar cloud of dust and gas, called a nebula . Most likely the next step was that the nebula flattened into a disk called the Protoplanetary Disk ; planets eventually formed from and in this disk.
How terrestrial and jovian planets are formed?
Summary: The terrestrial planets formed close to the Sun where temperatures were well suited for rock and metal to condense. The jovian planets formed outside what is called the frost line, where temperatures were low enough for ice condensation.
What is the difference between a nebula and a solar nebula?
Nebula is a large cloud of gas and dust in interstellar space. Solar nebula is a rotating cloud of gas and dust from which the sun and planets formed.
What is the difference between planetesimal and protoplanet hypothesis on the origin of the solar system?
Definition of planetesimal A planetesimal is a solid object arising during the accumulation of orbiting bodies whose internal strength is dominated by self-gravity and whose orbital dynamics is not significantly affected by gas drag. These bodies, larger than 100 km to 1000 km, are called embryos or protoplanets.
What forms planetesimals which form protoplanets?
Lesson Summary Condensation, the process of forming solid particles from the solar nebula, is an early process in the formation of a planetesimal, an early solar system body of small to medium size that combines with other planetesimals to form protoplanets.