an astronomical tour
DESCRIPTION
An Astronomical Tour. Objects in the Universe. 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. Active Sun viewed in X-rays ->. - PowerPoint PPT PresentationTRANSCRIPT
An Astronomical Tour
Objects in the Universe
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
Active Sun viewed in X-rays ->
<- Coronal loops
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
Mercury
Venus (UV)
Earth
Earth’s Moon
Earth and its Moon
Earth and its Moon
Mars
Jupiter and the four Galilean Moons
Saturn and Its Larger Moons
Uranus (true and false color)
Neptune
Pluto and Charon (from HST faint object camera)
Our Solar System
The Planets (in size perspective)
Asteroids (Phobos, Deimos, Gaspra)
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.
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.
Comet Halley (March 1986)
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.
Galaxies
HST Deep Field Photo of Galaxies
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.
Eskimo Nebula
Orion Nebula
Carina Nebula
Cat’s Eye Nebula
Sting Ray Nebula(young)
Bug Nebula
Section of the Eagle Nebula
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.