Rabu, 14 September 2022

For What Type Of Object Is The Period-luminosity Relation Used For Determining Distances?


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He used the inverse square law of light brightness on a particular type of variable star in those old star clusters. Some stars are very useful for finding distances to clusters and to other galaxies because they have a known luminosity that is large, so they can be seen from great distances away. Bright objects of a known luminosity are called. Rr lyrae variables b.

They believed that the milky way was the entire universe and that the sun was at the center of the milky way galaxy. This is simply the time it takes a sound (or pressure) wave to cross the stellar diameter. V s 2 =dp/dρ, where p and ρ are the pressure and density, respectively. Cepheids it was the distribution of ___ globular clusters _ that showed harlow shapley we were no where near the center of the milky way in the 1920s. Which is the correct description of the sun's location within the milky way? Motions of objects near our galaxy's core suggest the central black hole is about 3. 7 billion solar masses. Most of the mass of the milky way seems to exist in the form of: Dark matter out in the halo. A) planetary nebulae b) rr lyrae variables c) t tauri variables d) cepheid variables e) cataclysmic variables question 2 (1 point) which is the correct description of the sun's location.



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