New User Special Price Expires in

Let's log you in.

Sign in with Facebook


Don't have a StudySoup account? Create one here!


Create a StudySoup account

Be part of our community, it's free to join!

Sign up with Facebook


Create your account
By creating an account you agree to StudySoup's terms and conditions and privacy policy

Already have a StudySoup account? Login here

ASTR 151 Chapter 10

by: Wesley Fowler

ASTR 151 Chapter 10 ASTR 151 001

Marketplace > Astronomy > ASTR 151 001 > ASTR 151 Chapter 10
Wesley Fowler

GPA 3.97

Preview These Notes for FREE

Get a free preview of these Notes, just enter your email below.

Unlock Preview
Unlock Preview

Preview these materials now for free

Why put in your email? Get access to more of this material and other relevant free materials for your school

View Preview

About this Document

These notes go over Mars, the 4th planet from the Sun.
Journey Thr Solar Sys Lecture
Dr. Sean Lindsay
Class Notes
Mars, planet, orbit, Volcano, Volcanism, Basin, polar, Caps, Water, ice
25 ?




Popular in Journey Thr Solar Sys Lecture

Popular in Astronomy

This 4 page Class Notes was uploaded by Wesley Fowler on Friday April 22, 2016. The Class Notes belongs to ASTR 151 001 at a university taught by Dr. Sean Lindsay in Spring 2016. Since its upload, it has received 10 views.


Reviews for ASTR 151 Chapter 10


Report this Material


What is Karma?


Karma is the currency of StudySoup.

You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!

Date Created: 04/22/16
Wesley Fowler ASTR Chapter 10 Mars th Distance from Sun: 1.52 AU (4 planet from the Sun) Radius: 3,390 km (0.52 Earth radii) Mass: 6.4 x 10 kg (0.11 Earth Masses) Average Density: 3,900 kg/m (LOW density) 3 *Average density of surface rocks: 2,500kg/m Mean Temperature: 210 K (81.4 F) o Max Temperature about 300 K Does have an atmosphere: Very thin (6% of Earth’s) Does not have a magnetic field: No longer exists Mars’ Orbit Orbital Period: 1.88 years (~687 days) Rotational Period (Sidereal Day): 24 hrs 37 min Semimajor Axis: 1.52 AU Eccentricity: 0.094 - Closest Opposition: 0.37 AU (Distance between Mars and Earth when closest to Earth) - Opposition to opposition roughly every 780 days. This is Mars’ synodic period. Martian days are called sols Mars’ axial tilt (obliquity) changes from 10 to 60 over very long periods of time Mars’ Surface Has polar ice caps that show seasonal variability - Lowland Northern hemisphere: Smooth volcanic plains - Highland Southern hemisphere: Dark mountains Crater counting dates volcanic activity around 100 million years ago Surface Features Tharsis bulge: Contains four huge volcanoes - Size of North America, 10km above surface Olympus Mons: The largest volcano on Mars, being 700 km across it covers a surface area equal to the size of Arizona. - Sticks out of atmosphere Hellas Basin: Large impact basin in the southern hemisphere. Valles Marineris: Huge canyon, the biggest in the solar system - 4000km long, deepest at 7km Water on Mars Runoff channels: Large, ancient river bed systems - Mostly in southern highlands - Active 4 billion years ago, which is the same as Mars’ atmosphere - Formation of clays - Suggest a wet period 4 billion years ago when the atmosphere was thick enough to support liquid water Outflow channels: Young areas characterized by a catastrophic flood - Only appear in equatorial regions, closer to northern lowlands - Have tear-drop shaped “islands” - 3 billion years old - Suggest a wet period about 3.7-3 billion years ago by a catastrophic period of flooding, possibly caused by the melting of ice on Mars. Water-ice currently exists on the surface of Mars. The higher latitudes have permafrost layers. - Supported by fluidized ejecta features: Water underneath the surface ejecting out from an impact Recurring Slope Lineae (RSLs): Long dark streaks associated with hydrated salts. These disappear in colder temperatures. Where did the water go? 1. Into the subsurface where it remains frozen 2. Lost to space via the photodisassociation of H O into H 2and O . H2ving so 2ittle mass, the H can easily escape the low Martian gravity and escape to space, and the oxygen 2 reacted with surface 3. Some locked in permanent North Polar Cap Martian Polar Caps Mars’ ice caps are predominantly made of dry ice (CO ice), howeve2 residual North Polar Cap is made of water-ice. - Mars’ eccentricity leads the southern cap to generally be larger than the northern cap The seasonal caps grow and shrink each year - Composed of almost entirely carbon dioxide with temperatures lower than 150K - Southern ~4,000km Northern ~3,000km - Growth and shrinkage alters atmospheric pressure by around 30% The residual cap remains permanently frozen - Brighter and smaller than seasonal caps, - Southern ~350km almost all CO 2 - Northern ~1000km almost all water ice Mars’ Atmosphere With no magnetic field to protect itself, Mars’ atmosphere was eroded away by solar wind - Mars lost its global magnetic field 4 billion years ago - Mars’ troposphere disappears at night because it’s too cold Composition: 95.3% CO 2 2.7% N 2 0.13% O 2 0.07% CO 0.03% water vapor Dust Storms: - Global dust storms once ever 5.5 years - 1-3 continent sized dust storm per Martian year Dust Devils: - Low wind speeds, bigger than Earth’s tornados Mars’ Interior Core believed to be between 1,500 and 2,100km in radius. 3 - Average density = 3900 kg/m (made of iron sulfide) Crust is about 50km thick Volcanos indicate Mars having a convective mantle Mars’ Moons Phobos and Deimos (fear and panic) - Only other terrestrial planet to have a moon - Moons are small compared to the Earth’s - Origin highly debated: possibly captured asteroids - Irregular in shape, look like asteroids - Very dark, albedo is ~0.06 Phobos’ most distinct feature is the 10km wide Stickney Crater. The impact should have destroyed Phobos. Deimos is the smaller one.


Buy Material

Are you sure you want to buy this material for

25 Karma

Buy Material

BOOM! Enjoy Your Free Notes!

We've added these Notes to your profile, click here to view them now.


You're already Subscribed!

Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'

Why people love StudySoup

Steve Martinelli UC Los Angeles

"There's no way I would have passed my Organic Chemistry class this semester without the notes and study guides I got from StudySoup."

Kyle Maynard Purdue

"When you're taking detailed notes and trying to help everyone else out in the class, it really helps you learn and understand the I made $280 on my first study guide!"

Jim McGreen Ohio University

"Knowing I can count on the Elite Notetaker in my class allows me to focus on what the professor is saying instead of just scribbling notes the whole time and falling behind."

Parker Thompson 500 Startups

"It's a great way for students to improve their educational experience and it seemed like a product that everybody wants, so all the people participating are winning."

Become an Elite Notetaker and start selling your notes online!

Refund Policy


All subscriptions to StudySoup are paid in full at the time of subscribing. To change your credit card information or to cancel your subscription, go to "Edit Settings". All credit card information will be available there. If you should decide to cancel your subscription, it will continue to be valid until the next payment period, as all payments for the current period were made in advance. For special circumstances, please email


StudySoup has more than 1 million course-specific study resources to help students study smarter. If you’re having trouble finding what you’re looking for, our customer support team can help you find what you need! Feel free to contact them here:

Recurring Subscriptions: If you have canceled your recurring subscription on the day of renewal and have not downloaded any documents, you may request a refund by submitting an email to

Satisfaction Guarantee: If you’re not satisfied with your subscription, you can contact us for further help. Contact must be made within 3 business days of your subscription purchase and your refund request will be subject for review.

Please Note: Refunds can never be provided more than 30 days after the initial purchase date regardless of your activity on the site.