THE UNIVERSE - - GRADE 9, UNIT 4 (4 weeks)
... 1. After the Big Bang, the universe expanded quickly (and continues to expand) and then cooled down enough for atoms to form; gravity pulled atoms together into gas clouds that became stars, which comprised young galaxies. 2. A galaxy is a group of billions of individual stars, star systems, star cl ...
... 1. After the Big Bang, the universe expanded quickly (and continues to expand) and then cooled down enough for atoms to form; gravity pulled atoms together into gas clouds that became stars, which comprised young galaxies. 2. A galaxy is a group of billions of individual stars, star systems, star cl ...
Herbig Ae/Be Stars
... • Why are there so few of these objects? • Perhaps stars evolve quickly through this region? ...
... • Why are there so few of these objects? • Perhaps stars evolve quickly through this region? ...
YSO/PMS disk types, time-scales and evolution from 1
... To move allow another perspective independent of the larger fluctuation of age in HR fitting; we also present a model based upon the scheme of Cieza et al (2007) Cieza use l turnoff and α excess – which describe the distance of the inner disk to the central star and the degree of opacity or thicknes ...
... To move allow another perspective independent of the larger fluctuation of age in HR fitting; we also present a model based upon the scheme of Cieza et al (2007) Cieza use l turnoff and α excess – which describe the distance of the inner disk to the central star and the degree of opacity or thicknes ...
Catching Andromeda`s Light
... per hour—so fast that it won’t fall into the black hole. All other stars in the Milky Way also move around the black hole at the Galaxy’s center. Likewise, all the stars in the Andromeda Galaxy move around its central black hole. Perhaps some of those stars have planets with intelligent beings who h ...
... per hour—so fast that it won’t fall into the black hole. All other stars in the Milky Way also move around the black hole at the Galaxy’s center. Likewise, all the stars in the Andromeda Galaxy move around its central black hole. Perhaps some of those stars have planets with intelligent beings who h ...
Here
... What Causes the Seasons? • Because of the tilt of the Earth’s axis, the altitude the Sun reaches changes during the year: It gets higher above the horizon during the summer than it does during the winter. • Also, the length of the daytime hours changes during the year: the daylight hours are longer ...
... What Causes the Seasons? • Because of the tilt of the Earth’s axis, the altitude the Sun reaches changes during the year: It gets higher above the horizon during the summer than it does during the winter. • Also, the length of the daytime hours changes during the year: the daylight hours are longer ...
Chapter 10
... Clearly, the brightest stars in the sky appear bright because of their enormous luminosities, not their proximity. Copyright © 2010 Pearson Education, Inc. ...
... Clearly, the brightest stars in the sky appear bright because of their enormous luminosities, not their proximity. Copyright © 2010 Pearson Education, Inc. ...
16. Magnitude Systems
... to convert between UBVRI and SDSS ugriz, and the SDSS DR8 Navigate Tool, all linked from the syllabus • use the UBVRI to ugriz transformations to show that the g magnitude displayed for PG1633+099A in the SDSS DR8 Navigate Tool is near the expected value • grab ugriz for PG1633+099A from the SDSS sw ...
... to convert between UBVRI and SDSS ugriz, and the SDSS DR8 Navigate Tool, all linked from the syllabus • use the UBVRI to ugriz transformations to show that the g magnitude displayed for PG1633+099A in the SDSS DR8 Navigate Tool is near the expected value • grab ugriz for PG1633+099A from the SDSS sw ...
PC3692: Physics of Stellar Structure (and Evolution)
... So the radius of a star, the effective temperature and luminosity are related, and if we can measure two of them, then we can determine the remaining third parameter. Fig. 4 illustrates the spectrum of the Sun. The top panel shows a low-resolution spectrum while the right panel shows a high-resoluti ...
... So the radius of a star, the effective temperature and luminosity are related, and if we can measure two of them, then we can determine the remaining third parameter. Fig. 4 illustrates the spectrum of the Sun. The top panel shows a low-resolution spectrum while the right panel shows a high-resoluti ...
astronomy webquest…… explore the universe
... http://outreach.atnf.csiro.au/education/everyone/pulsars/ ...
... http://outreach.atnf.csiro.au/education/everyone/pulsars/ ...
Supernovae and supernova remnants
... of these two components are long-lasting and are seen as a supernova remnant (SNR). As the ejecta expand into the interstellar medium, they sweep up the surrounding interstellar matter. As long as the material swept up is less than the mass of the ejecta, the expansion is considered to be a free exp ...
... of these two components are long-lasting and are seen as a supernova remnant (SNR). As the ejecta expand into the interstellar medium, they sweep up the surrounding interstellar matter. As long as the material swept up is less than the mass of the ejecta, the expansion is considered to be a free exp ...
Document
... H-R diagrams are useful because they help astronomers categorize stars into groups: Main sequence stars, like the Sun, are in a very stable part of their life cycle. White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen witho ...
... H-R diagrams are useful because they help astronomers categorize stars into groups: Main sequence stars, like the Sun, are in a very stable part of their life cycle. White dwarfs are hot and dim and cannot be seen without a telescope. Red giants are cool and bright and some can be seen witho ...
Ia 超新星的
... from estimated maximum light. We attempted to remove the 8 two most prominent telluric lines (indicated with the circled plus signs symbols), but some residuals are evident. The top spectrum shows the Si II λ6355 feature that defines the Ia class, as well as prominent Fe III absorption features at 4 ...
... from estimated maximum light. We attempted to remove the 8 two most prominent telluric lines (indicated with the circled plus signs symbols), but some residuals are evident. The top spectrum shows the Si II λ6355 feature that defines the Ia class, as well as prominent Fe III absorption features at 4 ...
THE PHYSICAL CHARACTERIZATION OF THE STARS 1
... gravitational collapse of giant and cold clouds of molecular gas, take long episodes of production of energy through thermonuclear reactions in their interior with a length that depends on the mass, and die as highly compact objects. The life of an isolated star is mainly driven by their initial mas ...
... gravitational collapse of giant and cold clouds of molecular gas, take long episodes of production of energy through thermonuclear reactions in their interior with a length that depends on the mass, and die as highly compact objects. The life of an isolated star is mainly driven by their initial mas ...
Here
... • If a white dwarf accretes matter from a close binary companion, a huge explosion on the white dwarf’s surface can be triggered. These events are called novae. ...
... • If a white dwarf accretes matter from a close binary companion, a huge explosion on the white dwarf’s surface can be triggered. These events are called novae. ...
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.