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Chapter 8: Problem 11

What are proplyds? What do they tell us about the plausibility of our model of the solar system's origin?

Short Answer

Expert verified
Proplyds, or protoplanetary disks, are rotating disks of dense gas and dust around a young star. The presence of these disks around many young stars supports the Nebular Hypothesis, which is our core model for the solar system's formation, implying that planets and solar systems could be quite a common occurrence in the universe and providing significant support to the plausibility of our solar system's origin model.

Step by step solution

01

Understanding Proplyds

Proplyds, or protoplanetary disks, are rotating circumstellar disks of dense gas and dust around a young star. The gas and dust in these disks give rise to planets and other celestial bodies in the process called accretion.
02

Understanding the Solar System's Model

The widely accepted model of solar system's formation is known as the Nebular Hypothesis. According to this theory, solar systems are formed from the gravitational collapse of a giant molecular cloud, which begins to spin, forming a flattened disk - the protoplanetary disk or proplyd.
03

Connecting Proplyds with the Solar System Model

The presence of proplyds, in different stages of their evolution, is one of the key pieces of evidence supporting the nebular hypothesis. The observation of these disks around many young stars in our galaxy suggests that planets are a common occurrence in the universe, offering substantial support to our model of solar system's origin.

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Most popular questions from this chapter

(a) If the Earth had retained hydrogen and helium in the same proportion to the heavier elements that exist elsewhere in the universe, what would its mass be? Give your answer as a multiple of the Earth's actual mass. Explain your reasoning. (b) How does your answer to (a) compare with the mass of Jupiter, which is 318 Earth masses? (c) Based on your answer to (b), would you expect Jupiter's rocky core to be larger, smaller, or the same size as the Earth? Explain your reasoning.

What is meant by a substance's condensation temperature? What role did condensation temperatures play in the formation of the planets?

What is a planetesimal? How did planetesimals give rise to the terrestrial planets?

Is there evidence that planets have fallen into their parent stars? Explain.

What is the nebular hypothesis? Why is this hypothesis accepted?
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