Sun-Galaxy

Sun-Galaxy - Apparently bright Stars as seen from the Earth...

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Sun-Galaxy Interaction Material is build up on Solar wind from particles in space called Heliosphere o Distorted because of motion of the Sun itself through the galaxy o Stretches out the heliosphere bubble in the reverse direction o Voyager 1 and 2 flying out from the sun currently, about to reach the boundary of heliosphere and interstellar space Can make direct measurements Figure out what’s going on between the solar wind and interstellar boundary The Sun: a ship plowing through the Galactic Ocean, tossed by currents, surrounded by a bow shock How is the Sun like other stars? How does it compare to other stars? Are other stars active? Do other stars have companions? How long will the Sun and stars live and what happens when they die? o Harder to study other stars than the Sun The Solar Neighborhood Open Clusters o Stars Regularly distributed, lots of gas and dust, typically very young stars Globular Clusters o Stars packed together, little gas and dust, older stars
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Unformatted text preview: Apparently bright Stars as seen from the Earth o Sun, Sirius, Canopus, Arcturus Magnitude: measure relative brightness lower the magnitude brighter the star Looking at Absolute Magnitude tells actual brightness of star though it might not seem as bright to us on Earth because of the distance away the star is at Spectral Type: measures of stellar temperature and size Closest star to Earth besides the Sun is 4.2 lightyears away Normal Kinds of stars o The sun o Brown Dwarf Smaller than the sun .1 times the size of the sun o Giant 10-50 times the size of the sun o Super Giant 50-1000 times the size of the sun o Wolf-Rayet 3-10 times the size of the sun o Hypergiant 1000-2000 times the size of the sun believe they are getting ready to explode Important for measuring stars: size, mass, luminosity, temperature, speed, rotational velocity, stellar winds, magnetic field strength, composition...
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Sun-Galaxy - Apparently bright Stars as seen from the Earth...

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