Insert Title Here
My Favorite things about Cheese...
Insert Favorite Websites Here
Angelfire - Free Home Pages
Free Web Building Help
Angelfire HTML Library
HTML Gear - free polls, guestbooks, and more!
(Y) AU - Best unit to measure distances to planets
(EE) Period-Luminosity Relationship - Cephied Variables
(M) H-R Diagram - Main Sequence Stars
(FF) Cephied variables - Helped to measure distances to nearby galaxies
(I) Type M stars - Red Giant stars
(H) Horsehead nebula - Absorption nebula
(C) Trifid Nebula - Emission Nebula
(B) Maunder minimum - The Sun
(F?,O) Whirlpool galaxy - Spiral galaxies
(U) Parsec - Best unit to measure distance to nearby stars
(Q) The most abundant galaxy type = Elliptical galaxies
(X) megaparsec - Best unit to measure distance to "the wall"
(W) kiloparsec - Best unit to measure distance to other stars in the Milky Way
Harlow Shapley pioneer studies of binary stars and star clusters, He calculated that our sun is 30,000 light years from the center of the Milky Way
Henrietta Leavitt - she studied the brightness of stars and showed how that variable could be used to judge their distance
Ejnar Hertzsprung - he discovered high-luminosity, or giant, stars, he calculated the distance to the Small Magellanic Cloud, a graph in which the luminosity of a star is plotted against its surface temperature called Hertzsprung-Russell diagram.
Simon LaPlace - In his study of the gravitational attraction of spheroids, he formulated the fundamental differential equation in physics which now bears his name
Subra Chandrasekhar His most famous discovery was that not all stars end up as white dwarf stars, but those retaining mass above a certain limit - today known as "Chandrasekhar's limit," undergo further collapse
Arno Penzias along with Robert Wilson , their discovery has been used as evidence in support of the big bang theory that the universe was created by a giant explosion billions of years ago
Jocelyn Bell she noticed an unusually regular signal, shown to be bursts of radio energy at a constant interval of just over a second - the first pulsar
Stephen Hawking dealing with black holes, singularities, and the "big bang' theory of the origin of the universe. His popular writing is also notable, especially A Brief History of Time
Annie Cannon - Devising a system for classifying stellar spectra, she reorganized the classification of stars in terms of surface temperature and catalogued over 225,000 stars
Edwin Hubble The numerical relationship between a galaxy's distance and the speed of recession is known as "Hubble's Constant.")
Carl Seyfert he did pioneering research of nuclear emission in spiral galaxies, he published a paper on galaxies with bright nuclei that emit light with emission line spectrum, and exhibit characteristically broadened emission lines. These galaxies are since called Seyfert Galaxies
Edouard Roche Roche Limit. It is the closest distance a body held together by self-gravity can come to a planet without being pulled apart by the planet's tidal (gravity) force. As a result, large moons cannot survive inside the Roche Limit
Karl Schwarzschild The Schwarzschild radius is the critical radius at which an object becomes a black hole if collapsed or compressed indefinitely. At this radius the escape velocity is the speed of light. Its value is 9`mm/0¨35`in for Earth, 3`km/1¨9`mi for the Sun
R. Brent Tully - The Tully-Fisher relation is an empirical relationship between the luminosity of a spiral/irregular galaxy and its rotational velocity
(9) Virgo Cluster of Galaxies 45-55 mil LY +/-
(2) Spica 262 LY
(6) Large Magellanic Cloud 190,000 LY
(8) Whirlpool Galaxy 30-40 mil LY
(1) Alpha Centauri 4.3 LY
(5) Center of the Milky Way 8-10 kpc (* 1 pc = 3.26 LY)
(7) Andromeda Galaxy 2.9 mil LY
(3) Deneb 1,467 LY
(4) M4 (nearest globular cluster) 7,000 LY
