Learning Goal 7
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School
Washington State University *
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Course
135
Subject
Astronomy
Date
Dec 6, 2023
Type
docx
Pages
2
Uploaded by HighnessHeronPerson994
Learning goal one
Describe how our understanding of planetary system formation developed from the work of both
planetary and stellar scientists.
A common byproduct of creating stars is our planets and many stars are the surrounded by planetary
systems. Gravity pulls large clumps of gas and dust together causing them to shrink and superheat.
Angler momentum must be conserved leading both to spin around a central star an accelerate across the
disc that rotates and revolves in the same direction as the central star solar system meteorites show that
larger objects build up from smaller objects.
learning goal 2
Discuss the role of gravity and angular momentum and explaining why planets orbit the sun in a plane
and why they revolve in the same direction that the sun rotates.
As tons of tiny particles orbit the forming star the cloud of dust and gas flattens into a plane conservation
of angular momentum then determines the speed and direction of the revolution of all these objects in
the forming system. dust grains and the protoplanetary disks first stick together because of collision and
static electricity as they grow larger and larger eventually, they even have math that is enough to attract
others gravitationally. Once this occurs, they begin emptying the space around them. Collisions of
planetesimals lead to the formation of large planets.
learning goal 3 explain how temperature at different locations in the protoplanetary disks affect the
composition of planets moons and other bodies.
The temperature is higher near the central protostar, forcing lots of volatile elements, such as water to
evaporate and leave the inner part of the disk. Planets in the inner part of the disk will have fewer
volatiles’ windows in the outer part of the disk. The gas study planning captures when it forms is the
planet's primary atmosphere smaller less massive planets will lose their primary atmosphere and then
form secondary atmospheres later.
learning goal 4 discuss the process that resulted in the formation of planets and other objects in our
solar system.
In the current model of the formation of the solar system, solid terrestrial planets are formed in the
inner disk where temperatures were high, whereas giant gaseous planets formed in the outer disk where
temperatures were low. Dwarf planets such as Pluto formed in the asteroid belt and in the region
beyond the orbit of Neptune. All asteroids and comet nuclei remained today as leftover debris.
learning goal 5 describe how astronomers find planets around and other stars and derive exoplanet
properties.
The way astronomers find new planets around other stars is by using the radial velocity method the
transit method microlensing astronomy or direct image. As technology has improved the number and
variety of known exoplanets has increased dramatically with thousands of planets and planet candidates
discovered orbiting other stars near the sun within the Milky Way Galaxy in just the past few years.
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