Describe the different hypothesis (Nebular Hypothesis, Planetesimal Theory, and Tindal Theory) explaining the origin of solar system.


Answers

Answer 1

Answer:

Nebular Hypothesis:

According to this theory, the Sun and all the planets of our Solar System began as a giant cloud of molecular gas and dust. Then, about 4.57 billion years ago, something happened that caused the cloud to collapse. This could have been the result of a passing star, or shock waves from a supernova, but the end result was a gravitational collapse at the center of the cloud.

From this collapse, pockets of dust and gas began to collect into denser regions. As the denser regions pulled in more and more matter, conservation of momentum caused it to begin rotating, while increasing pressure caused it to heat up. Most of the material ended up in a ball at the center while the rest of the matter flattened out into disk that circled around it. While the ball at the center formed the Sun, the rest of the material would form into the protoplanetary disc.

The planets formed by accretion from this disc, in which dust and gas gravitated together and coalesced to form ever larger bodies. Due to their higher boiling points, only metals and silicates could exist in solid form closer to the Sun, and these would eventually form the terrestrial planets of Mercury, Venus, Earth, and Mars. Because metallic elements only comprised a very small fraction of the solar nebula, the terrestrial planets could not grow very large.

Planetesimal Theory:

The planetesimal theory, put forth by Viktor Safronov in 1941, explains planet formation in the early solar system from accretion of small bodies, growing in size as gravity attracted more and more objects. As the small bodies orbit, their gravity is very weak and they must rely on non-gravitational forces to stay together, such as radiation pressure and the emission of thermal photons.

Growth of the small planetesimal caused the strength of its gravity to increase. Growth to approximately one kilometer in size allowed the gravity of planetesimals to attract objects to them, increasing their size to seeds for planetary formation.

Collisions were common during the formation of the solar system and planets. Planetesimals continually collided and destroyed each other, but some planetesimals were able to withstand the impacts and grow, eventually forming into planets.

In contrast, the giant planets (Jupiter, Saturn, Uranus, and Neptune) formed beyond the point between the orbits of Mars and Jupiter where material is cool enough for volatile icy compounds to remain solid (i.e. the Frost Line). The ices that formed these planets were more plentiful than the metals and silicates that formed the terrestrial inner planets, allowing them to grow massive enough to capture large atmospheres of hydrogen and helium. Leftover debris that never became planets congregated in regions such as the Asteroid Belt, Kuiper Belt, and Oort Cloud.

Tidal Theory:

involving the approach near the Sun of another star. This set up tidal forces, and the instability of the Sun resulted in part of its mass being torn off to form the planets. The theory was proposed by Sir James H. Jeans (1877–1946) and Sir Harold Jeffreys.


Related Questions

Other Questions
Please help asap! I will mark you brainliest. Write one sentence in Spanish to show him where to stop. Remember:Use one affirmative t (informal) command.Use parar. Convert 385k to temperature of Find the value of x. Round to the nearest tenth. could someone explain how to figure this out (marking brainliest to the most helpful answer) I will report fakes. When Henry's little brother accidentally locked himself inside his mother's car, Henry used his mother's car key to unlock the door. Henry's action could best be described as a Write a program that asks the user to enter in a username and then examines that username to make sure it complies with the rules above. Here's a sample running of the program - note that you want to keep prompting the user until they supply you with a valid username: help again geometry similarity transformations describe how Ubuntu could help fight poverty derive an expression for resistivity of conductor of length l and area of cross section A Which was a common restriction included in the black codes? 4. . 2 . . An advertiser goes to a printer and is charged $36 for 80 copies of one flyer and $46 for 242 copies of another flyer. The printer charges a fixed setup cost plus a charge for every copy of single-page flyers. Find a function that describes the cost of a printing job, if xx is the number of copies made. PLEaseeee HELP MEEE I beg pleaseee I think I got this wrong please correct me. In figure above, if l1 | | l2 then value of x is:a) 40b) 50c) 80d) 100 solve for x. solve for x. solve for x. A bag contains 3 red, 5 blue, and 4 white marbles. If a marble is drawn from the bag, not replaced, and another is drawn, what is the probability of selecting a white and then blue marble? If enough experimental data supports a hypothesis, then it:O A. Is proven 100% true.OB. Is falsified.OC. Is accepted as true until prolan false.OD. Becomes an Observational Law what are the problems of various employment sectors? Political Cartoon Analysis. Using you knowledge ofUS History, interpret the meaning of the politicalcartoon. Answer must be at least 3 completesentences.LASTING FREEDOM, PEACE S PROSPERITY COME FROM ADHERINS TO THE LAWS OF NATUREFEDERALSTATECOUNTYLOCALWe Be PeopleLAWS OF NATURE The author of Passage 2 would likely criticize the author of Passage 1 for