Astro Prelim 2
Terms in this set (19)
-Patterns of motions of the larger bodies
-Existence of two types of planets
-Existence of smaller bodies
-Notable exceptions to usual patterns
What major characteristics of the Solar System does a formation theory need to be able to explain?
How can we explain the exceptions to the rule in our Solar System?
Late Heavy Bombardment (Both Earth and Uranus experienced large collisions which explains
How did Earth "get" its Moon?
The moon is most likely the remnants from a large Mars-like object colliding with the Earth during its formation. Remnants were then caught in Earth's orbit and accreted to form the Moon (this explains why our moon is so much larger than others in the Solar System)
How did Mars "get" its Moons?
Phobos and Deimos are captured planetesimals
List the planets in our Solar System from the Sun outwards
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Which rocky planet has the hottest average surface temperature?
Which rocky planet has the coolest average surface temperature?
Which is the smallest and which is the biggest Solar System planet?
Mercury is the smallest, Jupiter the largest
Do all giant planets have rings and moons in our Solar System?
Do all rocky planets have moons in our Solar System?
What do we mean when we talk about the greenhouse effect?
The greenhouse effect is when the gasses in an atmosphere trap heat and warm the surface of a planet
How can you estimate whether a planet or moon has an atmosphere if you only know its mass, radius and temperature?
What processes can add gas to a rocky planet's atmosphere?
Evaporation of liquid/ice
Impacts of particles and photons
What processes can remove gas from a rocky planet's atmosphere?
Condensation onto surface
Chemical reactions w/ surface
Large impacts blasting gas into space
What are the three processes that shape a planet?
1) Small particles of rock and metal were present inside the frost line
2) Planetesimals of rock and metal built up as these particles collided
3) Gravity eventually assembles these planetesimals into terrestrial planets
Who was the first human in space
In what year did the first human reach space/orbit the Earth?
1961, Yuri Gagarin
Who was the first American in space?
Alan Shepard Jr.
In what year did the first human land on the moon?