Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

MasteringAstronomy Assignment #10, Exercises of Astronomy

Academy of Careers and TechnologyAstronomy

A collection of visual activities and ranking tasks related to astronomy. It covers topics such as habitable zones, the search for extraterrestrial life, and the study of the solar interior. questions about the factors that determine the habitability of a planet, the methods used to estimate the number of advanced civilizations in the galaxy, and the ways in which astronomers study the Sun's interior. suitable for university students studying astronomy or related fields.

Typology: Exercises

2021/2022

Available from 11/19/2022

alfa-bets
alfa-bets 🇺🇸

5

(1)

290 documents

1 / 9

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
MasteringAstronomy Assignment #10
Visual Activity Exploring the Habitable Zone around a Central Star
As the mass of the central star increases, the distance to the habitable zone __________ and the size
(width) of the habitable zone __________.
increases / increases
Suppose that our Sun was cool enough to include Mercury in its habitable zone. Which of the
following would be true in that case?
Only Mercury would be in the Sun's habitable zone.
Scientists think it is very unlikely that complex and large forms of life could evolve on planets that orbit
stars that are much more massive than the Sun. Why?
The expected lifetime of a massive star is too short to allow for the evolution of complex life
Searching for Signs of Intelligence (Process of Science)
Part A
Currently, astronomers are observing the universe across many different regions of the
electromagnetic spectrum, from gamma rays to radio waves. One of the primary issues when
considering communication with potential life outside our planet is how an extraterrestrial signal would
be distinguished from natural radiation sources. Sort the following source properties by whether they
might be considered as originating from intelligence or simply be natural phenomena.
Part B
In searching for signs of intelligence elsewhere in the universe, scientists begin with assumptions
based on biological and chemical properties of Earth. They also examine how signals from Earth
might appear to an observer in space. Select the statements that correctly describe what an
extraterrestrial observer outside our Galaxy might see when viewing Earth.
a pulsating radio signal that varies in intensity during each cycle
spectral evidence that.nitrogen.and oxygen are the most abundant gases
natural emissions.minimized.in the 18-cm to 21-cm wavelength range called the "water hole"
Process of Science: Estimating the Number of Advanced Civilizations in
our Galaxy
Part A
Each factor within the Drake equation can be estimated individually. However, some factors are
largely grounded in astronomical data, while others are based on speculation of how life evolved on
the Earth. Identify which factors in the Drake equation are estimated from astronomical observations
and which are based on speculation.
pf3
pf4
pf5
pf8
pf9

Partial preview of the text

Download MasteringAstronomy Assignment #10 and more Exercises Astronomy in PDF only on Docsity!

MasteringAstronomy Assignment

Visual Activity Exploring the Habitable Zone around a Central Star

As the mass of the central star increases, the distance to the habitable zone __________ and the size (width) of the habitable zone __________. increases / increases Suppose that our Sun was cool enough to include Mercury in its habitable zone. Which of the following would be true in that case? Only Mercury would be in the Sun's habitable zone. Scientists think it is very unlikely that complex and large forms of life could evolve on planets that orbit stars that are much more massive than the Sun. Why? The expected lifetime of a massive star is too short to allow for the evolution of complex life

Searching for Signs of Intelligence (Process of Science)

Part A Currently, astronomers are observing the universe across many different regions of the electromagnetic spectrum, from gamma rays to radio waves. One of the primary issues when considering communication with potential life outside our planet is how an extraterrestrial signal would be distinguished from natural radiation sources. Sort the following source properties by whether they might be considered as originating from intelligence or simply be natural phenomena. Part B In searching for signs of intelligence elsewhere in the universe, scientists begin with assumptions based on biological and chemical properties of Earth. They also examine how signals from Earth might appear to an observer in space. Select the statements that correctly describe what an extraterrestrial observer outside our Galaxy might see when viewing Earth. a pulsating radio signal that varies in intensity during each cycle spectral evidence that nitrogen and oxygen are the most abundant gases natural emissions minimized in the 18-cm to 21-cm wavelength range called the "water hole"

Process of Science: Estimating the Number of Advanced Civilizations in

our Galaxy

Part A Each factor within the Drake equation can be estimated individually. However, some factors are largely grounded in astronomical data, while others are based on speculation of how life evolved on the Earth. Identify which factors in the Drake equation are estimated from astronomical observations and which are based on speculation.

Part B The third factor of the Drake equation is an estimate of the number of habitable planets each planetary system might contain. Two key parameters that need to be considered when determining a planet’s ability to sustain life are the planet’s distance from its parent star, which determines whether the planet is in the stellar habitable zone, and the parent star’s distance from the galactic center, which determines if the star is in the galactic habitable zone. Consider the following sets of conditions, and sort each set according to whether it has a high or low probability of supporting life. Part C The last few factors in the Drake equation cannot be scientifically evaluated using current technologies. Astronomers can only estimate their values from either a pessimistic or an optimistic point of view. Choose the statements from the list below that indicate a high probability (optimistic estimate) that life exists elsewhere in the universe. Environments suitable for the creation of organic molecules are common. Chemical reactions leading to complex molecules are common. Planets with conditions that remain stable over long periods of time are common. Part D The key factor in the Drake equation that determines whether humans will ever make contact with intelligent life in the universe is the average lifetime of technologically advanced societies. Assume that the life expectancy of advanced civilizations is generally low. Which of the following statements explain why it is unlikely that we will ever communicate with other civilizations? There are too few advanced civilizations in the galaxy. The distance between advanced civilizations in light-years is greater than their lifetimes in years.

Process of Science: The Solar Interior

Explain how studies of the solar surface provide information about the Sun’s interior.Astronomers can make direct observations of the Sun’s atmosphere and photosphere, but since they cannot directly observe the Sun’s interior, they must obtain information from indirect observations and mathematical modeling. This tutorial will explore how astronomers learn about the solar interior using these indirect methods. Part A - The standard solar model Drag the appropriate labels to their respective targets.

Stellar Distances

Part A - Triangulating distances One of the most fundamental techniques used to determine distances is triangulation. This same method is used to detect a star’s parallax and corresponding distance. Triangulation involves observing the same object from two vantage points, so that the object, along with the two vantage points, forms a triangle in space. In the figure, label the essential components used to triangulate the distance to a building located on the opposite side of an empty lot. Part B - Stellar parallax When triangulation is used to detect stellar parallax, observations are made from different parts of Earth's orbit around the Sun. The figure shows observations taken in January and July, corresponding

to opposite sides of Earth's orbit. Identify the key parameters used to determine the star's distance from Earth. Part C - Stellar motions In addition to the apparent motion of stars caused by parallax, stars also have real motions through space that differ from that of the Sun and the solar system. The annual motion of a star across the sky as seen from Earth is called its proper motion. Once a star's distance and proper motion are known, they can be used to calculate a star's transverse velocity. Using Doppler shift measurements, astronomers can calculate a star's radial velocity, and then combine it with the transverse velocity to determine the star's true space velocity, or how fast it actually moves through space.

Match the words in the left column to the appropriate blanks in the sentences on the right.

Part D Five stars are shown on the following H-R diagrams. Rank the stars based on their surface temperature from highest to lowest. If two (or more) stars have the same surface temperature, drag one star on top of the other(s). (Increase right to left) Part E Five stars are shown on the following H-R diagrams. Rank the stars based on their luminosity from highest to lowest; notice that these are the same five stars shown in Part D. If two (or more) stars have the same luminosity, drag one star on top of the other(s). Part F Five stars are shown on the following H-R diagrams. Rank the stars based on their surface temperature from highest to lowest. If two (or more) stars have the same surface temperature, drag one star on top of the other(s). (Increase right to left) Part G Five stars are shown on the following H-R diagrams; notice that these are the same five stars shown in Part F. Rank the stars based on their luminosity from highest to lowest. If two (or more) stars have the same luminosity, drag one star on top of the other(s).

Which of the following is NOT one of the steps involved in the development of life that has been successfully performed in laboratory experiments? production of DNA by assembly of amino acids and precursor proteins Which of the following is NOT a general characteristic of life? needs oxygen In what sense are viruses on the border between material that we consider living and that we consider nonliving? Viruses cannot reproduce on their own but must make use of the genetic machinery of the cells they invade to multiply. Which of the following objects are considered the three most likely solar system candidates for extraterrestrial life? Mars, Europa, and Titan Scientists say that silicon-based life may be possible but not probable. Why is silicon not as good a choice as carbon for organic molecules? Silicon's bonds aren't as strong as carbon's, so it may not be able to build complex molecules. Which term of the Drake equation is completely unknown and the hardest to determine? lifetime of a technological civilization What question does the Drake equation attempt to answer? What is the number of technological civilizations in the Galaxy? Which of the following is NOT a term of the Drake equation used to calculate the number of current technological civilizations in our Galaxy? the fraction of planets orbiting G-type stars What is the "stellar habitable zone"? the range of distances from a star in which an Earth-like planet could sustain liquid water Do astronomers expect to find planets around binary stars that are stable enough for life to develop? Why? No. While it is possible for planets to form stable orbits in binary star systems, those orbits do not provide stable conditions for life. If we communicated with a civilization from another star, how long would a conversation with them take? years Which of the following is NOT an advantage of using radio frequencies near the hydrogen and hydroxyl wavelengths of 18 and 21 cm, respectively, to search for signals from beyond our planet? Since radio waves are comparatively long, it is easy to achieve good angular resolution with even a small radio telescope compared to optical telescopes, making it easier to pinpoint a potential source.