Chapter 15
... 11. What measurements are needed to determine the entire mass of the Milky Way Galaxy? a. The rotational velocity of a star near the Galaxy's outer edge. b. The spectral type and luminosity class of a star near the Galaxy's outer edge. c. The distance to a star near the Galaxy's outer edge. d. Both ...
... 11. What measurements are needed to determine the entire mass of the Milky Way Galaxy? a. The rotational velocity of a star near the Galaxy's outer edge. b. The spectral type and luminosity class of a star near the Galaxy's outer edge. c. The distance to a star near the Galaxy's outer edge. d. Both ...
C - ScienceWilmeth5
... length of the shadow from 2P.M. to 4P.M.? A. The length of the shadow will stay the same. B. The length of the shadow will decrease and then increase. C. The length of the shadow will increase. D. The length of the shadow will decrease. ...
... length of the shadow from 2P.M. to 4P.M.? A. The length of the shadow will stay the same. B. The length of the shadow will decrease and then increase. C. The length of the shadow will increase. D. The length of the shadow will decrease. ...
2016 Annual Report - International Dark
... This is what calendars used to be. To understand the patterns of change is essential to live a Venus and Crescent Moon ...
... This is what calendars used to be. To understand the patterns of change is essential to live a Venus and Crescent Moon ...
Lecture 15a - Sierra College Astronomy Home Page
... occurred in our galaxy, it would have had billions of years to explore the entire galaxy, before we even gelled from the primordial soup. Saying they haven’t gotten here yet, in the case of a 0.5 million year exploration time, would have the same likelihood as spending one day per year in a rental c ...
... occurred in our galaxy, it would have had billions of years to explore the entire galaxy, before we even gelled from the primordial soup. Saying they haven’t gotten here yet, in the case of a 0.5 million year exploration time, would have the same likelihood as spending one day per year in a rental c ...
Aldebaran
... Aldebaran started off as a large, relatively cool mass of gas, part of a nebula. As gravity caused the gas to contract, its temperature rose, eventually becoming high enough to trigger a nuclear reaction in its atoms. When the gases and dust of the nebula contracted, a protostar was formed. Gravity ...
... Aldebaran started off as a large, relatively cool mass of gas, part of a nebula. As gravity caused the gas to contract, its temperature rose, eventually becoming high enough to trigger a nuclear reaction in its atoms. When the gases and dust of the nebula contracted, a protostar was formed. Gravity ...
Timescales for the evolution of oxygen isotope compositions in the
... terrestrial Sun. The Sun is apparently 16O-rich; although it is not known at the present time whether the composition lies along the CAI mixing line because of uncertainties in mass-dependent corrections to the data, we will assume hereafter that it does lie on this line. The self-shielding models a ...
... terrestrial Sun. The Sun is apparently 16O-rich; although it is not known at the present time whether the composition lies along the CAI mixing line because of uncertainties in mass-dependent corrections to the data, we will assume hereafter that it does lie on this line. The self-shielding models a ...
Debris disks and the search for life in the universe Gianni Cataldi
... be the building blocks of planets. By definition, planetesimals are bodies massive enough that their orbital evolution is determined by mutual gravitational interactions, in contrast to smaller dust particles for which aerodynamic interactions with the gas are more important (Armitage 2009). Thus, p ...
... be the building blocks of planets. By definition, planetesimals are bodies massive enough that their orbital evolution is determined by mutual gravitational interactions, in contrast to smaller dust particles for which aerodynamic interactions with the gas are more important (Armitage 2009). Thus, p ...
Chapter 18 - Origin and Evolution of Stars Chapter Preview
... end of the life of a high-mass star that destroys the star and blows away most of its mass at supersonic velocities, several thousand kilometers per second (Figure 2). As this supersonic gas plows through the interstellar medium it smacks into giant molecular clouds, compressing them enough to trigg ...
... end of the life of a high-mass star that destroys the star and blows away most of its mass at supersonic velocities, several thousand kilometers per second (Figure 2). As this supersonic gas plows through the interstellar medium it smacks into giant molecular clouds, compressing them enough to trigg ...
File
... The Sun’s Atmosphere Even at a great distance from the Sun, you and your spacecraft can feel slight effects from the solar wind—the stream of charged particles continually blown outward in all directions from the Sun. Recall that the solar wind helps shape the magnetospheres of planets (see Figure 7 ...
... The Sun’s Atmosphere Even at a great distance from the Sun, you and your spacecraft can feel slight effects from the solar wind—the stream of charged particles continually blown outward in all directions from the Sun. Recall that the solar wind helps shape the magnetospheres of planets (see Figure 7 ...
PHYS3380_110415_bw - The University of Texas at Dallas
... Population III - metal-free stars • hypothetical population of extremely massive and hot stars with virtually no metal content, except for a small quantity of metals formed in the Big Bang, such as Lithium-7 • believed to have been formed in the early universe. RR Lyrae - older, less massive, and fa ...
... Population III - metal-free stars • hypothetical population of extremely massive and hot stars with virtually no metal content, except for a small quantity of metals formed in the Big Bang, such as Lithium-7 • believed to have been formed in the early universe. RR Lyrae - older, less massive, and fa ...
Astronomy and Survey of Information
... • In pairs where the two stars are of equal brightness, they are also of the same spectral type. • In systems where the brightnesses are different, the fainter star is bluer if the brighter star is a giant star, and redder if the brighter star belongs to the main sequence. • Since mass can be determ ...
... • In pairs where the two stars are of equal brightness, they are also of the same spectral type. • In systems where the brightnesses are different, the fainter star is bluer if the brighter star is a giant star, and redder if the brighter star belongs to the main sequence. • Since mass can be determ ...
with answers
... From v) we find that it will take 9.81 billion years for the hydrogen to be depleted, however, we are told that the Sun will only have 5 billion years of active life left (Shröder & Connon Smith 2008). This is a large discrepancy (almost twice as long). Possible reasons for the discrepancy: ● not al ...
... From v) we find that it will take 9.81 billion years for the hydrogen to be depleted, however, we are told that the Sun will only have 5 billion years of active life left (Shröder & Connon Smith 2008). This is a large discrepancy (almost twice as long). Possible reasons for the discrepancy: ● not al ...
Coming To A Planet Near You
... must orbit the Sun; be massive enough that its own gravity pulls it into a nearly round shape; and be dominant enough to clear away objects in its ...
... must orbit the Sun; be massive enough that its own gravity pulls it into a nearly round shape; and be dominant enough to clear away objects in its ...
Galactic Chemical Evolution and the Oxygen Isotopic Composition
... cannot be absolutely correct; winds from AGB stars and SN ejecta are hot and tenuous compared to molecular clouds and will not mix efficiently; and SNe drive bubbles and “galactic fountains” that eject hot gas into the halo. Gilmore (1989) suggested that molecular clouds may be self-enriched by the ...
... cannot be absolutely correct; winds from AGB stars and SN ejecta are hot and tenuous compared to molecular clouds and will not mix efficiently; and SNe drive bubbles and “galactic fountains” that eject hot gas into the halo. Gilmore (1989) suggested that molecular clouds may be self-enriched by the ...
Thesis.dot
... thanks to Dr. Elsa Leavitt whose familiarity with the needs and ideas of the class was helpful during the early programming phase of this undertaking. Thanks also to the members of the school council for their valuable input. ...
... thanks to Dr. Elsa Leavitt whose familiarity with the needs and ideas of the class was helpful during the early programming phase of this undertaking. Thanks also to the members of the school council for their valuable input. ...
The Moon, Planets and Polaris
... We can study these topics together because they are all variations on a theme. You should find few problems with them if you have managed to work with sun sights and they fall reasonably logically into a group of minor RYA exercises. There’s not much to add. The sights are all straightforward and th ...
... We can study these topics together because they are all variations on a theme. You should find few problems with them if you have managed to work with sun sights and they fall reasonably logically into a group of minor RYA exercises. There’s not much to add. The sights are all straightforward and th ...
A new method to determine the mean density of massive Solar
... distances to the Sun (Fig. 2); therefore their mean density trend is subtle. We allocate the asteroids into two groups, according to the values of the mean density. The first group includes a few asteroids with their mean densities higher than 4 g/cm 3. The mean densities of these asteroids show the ...
... distances to the Sun (Fig. 2); therefore their mean density trend is subtle. We allocate the asteroids into two groups, according to the values of the mean density. The first group includes a few asteroids with their mean densities higher than 4 g/cm 3. The mean densities of these asteroids show the ...
Reflection #12: The Journey Ends
... comet, dust, gases and primarily empty space. The Sun is the major source of heat and light for the Solar System. Everything in the Solar System is under the direct influence of the Sun’s gravitational pull, and these objects revolve around the Sun with known frequencies. Each planet is very differe ...
... comet, dust, gases and primarily empty space. The Sun is the major source of heat and light for the Solar System. Everything in the Solar System is under the direct influence of the Sun’s gravitational pull, and these objects revolve around the Sun with known frequencies. Each planet is very differe ...
Gravity, General Relativity, and Dark Matter
... While many people learn about Newton and his theory of gravity, most do not realize that our best understanding of gravity actually comes from Einstein. During the first decade of the 1900s, Einstein began to compose his theory of general relativity and it completely changed the way we view gravity. ...
... While many people learn about Newton and his theory of gravity, most do not realize that our best understanding of gravity actually comes from Einstein. During the first decade of the 1900s, Einstein began to compose his theory of general relativity and it completely changed the way we view gravity. ...
Lec01_ch01_night_sky
... • Since everyone wants the noon to be the middle of the day, we’ve developed time zones • We’ve also marked a grid of Latitude and Longitude to describe positions on the Earth – similar to Right Ascension/Declination, but fixed to the Earth (Prime Meridian in Greenwich England) rather than the dista ...
... • Since everyone wants the noon to be the middle of the day, we’ve developed time zones • We’ve also marked a grid of Latitude and Longitude to describe positions on the Earth – similar to Right Ascension/Declination, but fixed to the Earth (Prime Meridian in Greenwich England) rather than the dista ...
Formation and evolution of the Solar System
The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.The Solar System has evolved considerably since its initial formation. Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later been captured by their planets. Still others, such as the Moon, may be the result of giant collisions. Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System. The positions of the planets often shifted due to gravitational interactions. This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.In roughly 5 billion years, the Sun will cool and expand outward many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the far distant future, the gravity of passing stars will gradually reduce the Sun's retinue of planets. Some planets will be destroyed, others ejected into interstellar space. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it.