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Chapter 18: Problem 1

If no one has ever seen a star go through the complete formation process, how are we able to understand how stars form?

Short Answer

Expert verified
We understand how stars form through observing many stars at different stages of their lifecycle, gathering data from various sources, creating theories of star formation based on those observations, testing those theories with computer simulations and constantly refining the theories based on new observations and physical laws.

Step by step solution

01

Understanding the Observation of Stars

Scientists haven't seen a star go through its complete formation process because it takes millions to billions of years for a star to form, much longer than a human lifespan. However, scientists can observe tens of thousands of stars at different stages of their lifecycle in our galaxy and beyond.
02

Gathering Data from Various Sources

There are numerous telescopes and satellites observing the universe across different wavelengths. Each offers a distinct 'view' of stars at various stages of formation. This provides scientists with a range of data points to work with when constructing the lifecycle of stars.
03

Understanding Star Formation Theories

Based on the observations and collected data, astronomers develop theories of star formation. These theories describe the physical processes involved in the transformation of a cloud of dust and gas into a star. Theories are used to explain observed facts and to predict new ones.
04

Computer Simulations and Models

To test these theories and to better understand the various stages of star formation, scientists often use computer simulations. These simulations use the laws of physics to model how a star might form from a cloud of dust and gas.
05

Constant Refinement

As more observations are made and as our understanding of physics evolves and improves, these theories and models are refined. Discrepancies between observations and models provide new insights that can lead to refined theories.

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Most popular questions from this chapter

Use the Starry Night Enthusiast \({ }^{\mathrm{TM}}\) program to investigate a star-forming region. Use the Find ... command in the Edit menu to find and center on M20 (the Trifid Nebula, shown in the figure that accompanies Question 31) as seen from your location. Zoom out as far as possible using the Zoom controls at the righthand end of the toolbar. Set the Time appropriately and adjust the Month and Day in the Date to answer the following questions. (Hint: You may want to remove daylight and display the local meridian to provide precise answers.) (a) On what day is M20 highest in the sky at noon? Explain how you determined this. (b) On what day is M20 highest in the sky at midnight, so that it is best placed for observing with a telescope? Explain how you determined this.

Why is it more difficult to observe the life cycles of stars than the life cycles of planets or animals?

Why are low temperatures necessary in order for protostars to form inside dark nebulae?

Giant molecular clouds are among the largest objects in our Galaxy. Why, then, were they discovered only relatively recently?

Describe the energy source that causes a protostar to shine. How does this source differ from the energy source inside a main-sequence star?
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