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Chapter 15
Chapter 15

... the hydrogen fuel in its core to make helium. The helium is basically just sitting there, so it's not producing any energy. Instead, the core is shrinking and getting hotter. Before long, it'll get hot enough to ignite the helium, which will begin fusing together to make heavier elements. When that ...
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... We are on a planet, orbiting a star, in a galaxy (which is a member of the Local Group of galaxies in the Local Supercluster) • How did we come to be? • How can we know what the universe was like in the past? • Can we see the entire universe? ...
Measuring Starlight Deflection during the 2017 Eclipse: Repeating
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... All previous eclipse experiments required imaging the same star field six months before or after the eclipse, in order to determine the un-deflected star positions to sub-arcsecond accuracy. Parallax was not important, since the geometry of the sun and the earth was the same. This was one of the mos ...
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... how big something is in kilometers, instead of how big it appears to be in angular measure. To get this information, all we need to know is how far away the object is from us. The moon is 324,000 kilometers away, and Venus is about 40 million kilometers away from Earth at its closest distance. The f ...
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... Search allows you to find any star, constellation, Solar system body (the planets, the Sun, the Moon), Deep Space object or satellite, meteor showers, dwarf planets, asteroids and comets. Information icon appears in middle of the bottom part of the screen when you select any celestial body on the sc ...
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... where m is the brightness magnitude assigned to a star observed from Earth, f (·) is the mean spectral flux density at top of Earth’s atmosphere averaged over a defined band and Q(·) is the normalizing constant for that band [8]. We will not go into more details about astronomical magnitude systems ...
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... In the Greek legend, the Taurus is a disguise that Zeus uses to get what he wants. On this occasion, Zeus had fallen in love with Europa, the daughter of King Agenor. He transformed himself into a white bull that was so gentle, they felt no fear. As Europa and her maidens began to strongly trust the ...
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Ursa Minor



Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.
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