an astronomical tour objects in the universe. objects in our solar system l a solar system is a...
TRANSCRIPT
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An Astronomical Tour
Objects in the Universe
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Objects in our Solar System
A solar system is a collection of objects that are gravitationally associated with a star
Objects in our solar system include star, planets, moons, asteroids, comets, meteors
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Active Sun viewed in X-rays ->
<- Coronal loops
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Planets Objects that orbits (revolve around) a
star Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune (Pluto is a minor planet) My very excellent mother just served us
nachos
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Mercury
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Venus (UV)
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Earth
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Earth’s Moon
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Earth and its Moon
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Earth and its Moon
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Mars
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Jupiter and the four Galilean Moons
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Saturn and Its Larger Moons
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Uranus (true and false color)
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Neptune
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Pluto and Charon (from HST faint object camera)
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Our Solar System
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The Planets (in size perspective)
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Asteroids (Phobos, Deimos, Gaspra)
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Asteroid Belt
Between the orbits of Mars and Jupiter is a large “belt” of asteroids
There are also groups of asteroids that orbit the Sun and cross the orbit of the Earth from time to time.
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Comets and the Oort Cloud
Comets are “dirty snowballs” composed of frozen water and dust. As they approach the Sun they melt and leave a stream of water vapor and dust that is a “tail”
Scientists believe that these originate from a large region filled with comet cores called the Oort cloud.
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Comet Halley (March 1986)
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Moving Out…
Our solar system is a small part of a large collection of stars, gas, and dust called a galaxy.
Our galaxy is called the Milky Way galaxy and is a spiral galaxy.
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Galaxies
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HST Deep Field Photo of Galaxies
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Star Deaths
When stars finish their life cycle they may explode or throw out shells of gas. Such an object is referred to as a nebula (pl. nebulae)
Nebulae are common objects in a galaxy.
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Eskimo Nebula
Orion Nebula
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Carina Nebula
Cat’s Eye Nebula
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Sting Ray Nebula
(young)
Bug Nebula
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Section of the Eagle Nebula
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Other Objects…
There are special classes of stars called variable stars, neutron stars, pulsars and black holes. These may be stars in the process of evolving or the result of a star explosion.