Unformatted text preview:

Astronomy 150B - Midterm Name:February 7, 2002 TA’s Name & Section (2 pts):Answer all questions in the space provided. If you have any questions, raise your hand.100 points possible.0 (3 pts) Iron has a density of g/cm3, rocks have a density of about g/cm3, and water has adensity of g/cm3.The chart below shows the properties of four planets orbiting a star that is identical to our Sun. Use thesedata to answer the questions on the next two pages.Planet Mass Diameter Uncompressed Moment of Inertia Average Distance[Earth = 1] [Earth = 1] Density [g/cm3] Factor [K] from Star [AU]Leonore 1/8 1/2 5.0 0.38 0.4Violetta 1/10 1/2 4.0 0.40 0.8Tatyana 6 2 3.8 0.30 1.0Isolde 1/2 1 2.5 0.36 2.01 (6 pts) How long does it take the planet Isolde to orbit the star? [Show your work] Less than 1 year Between 1 and 2 years Between 2 and 3 years Between 4 and 5 years Greater than 5 years2 (5 pts) If we assume that these planets are made of the same materials as our solar system (ice, rock, andiron) what is the most likely composition of the planet Tatyana ?3 (8 pts) How does the gravity on Leonore compare to the gravity on the Isolde ? [Show your work.]4 (5 pts) Which of the planets is the most differentiated? [Explain your answer.]5 (6 pts) Explain why we can not use crater counting to determine the absloute age of the surface ofVioletta .We have seen this plot a lot in class. It shows that largerworlds are geologically active for longer periods of timethan smaller worlds.6 (8 pts) Explain why larger worlds are geologicallyactive for longer periods of time than smaller worlds.MarsVenusEarthMercuryMoonAsteroidDuration of Volcanic Activity(Billions of Years)Diameter Relative to Earth4.6432 107 (3 pts) A few of the meteorites collected on the Earth are 1-billion-year-old pieces of basalt. Accordingto the graph above, which worlds are possible sources for these meteorites?8 (5 pts) Which of these worlds is the most likely source and why?Craters per million square kmCrater Diameter (km)None LotsSmallLargeOn the graph above, sketch and label the crater size distributions of the following three worlds:9 (4 pts) (A) - An airless world with a very old surface.10 (4 pts) (B) - A world with a very old surface and a thick atmosphere.11 (4 pts) (C) - A geologically active world with no atmosphere.12 (4 pts) How would you determine the actual age of the surface of world (B)?13 (3 pts) What is the name of the geological feature shownin this image of the surface of the Earth’s moon?14 (9 pts) Describe how this feature was formed and where the energy for its formation came from. Alsoexplain why is it circular.15 (5 pts) Explain why these features were visited by the Apollo astronauts on every mission. [Hint: it isnot only because they are common on the Moon.]16 (4 pts) Describe one property of the Earth–Moon system that the Fission theory of lunar origin does agood job of explaining.17 (6 pts) Venus, Earth, and Mars all began with lots of carbon dioxide (CO2) in their atmospheres. TheEarth currently has very little CO2in its atmosphere. Explain what happened to it.18 (6 pts) Basalt is a very common rock in the inner solar system. For each of the following worlds, namea specific place where you would find basalt.The EarthMarsThe


View Full Document

UW ASTR 150 - Exam Guide

Download Exam Guide
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Exam Guide and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Exam Guide 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?