The Hubble Redshift Distance Relation
... must be located at the center of the Universe, but this is not the case. As we will discover in this lab, we are not in some preferred location in our Universe. In this lab we will also use the fact that galaxies appear to be moving away from us to infer an age for the Universe, based on the amount ...
... must be located at the center of the Universe, but this is not the case. As we will discover in this lab, we are not in some preferred location in our Universe. In this lab we will also use the fact that galaxies appear to be moving away from us to infer an age for the Universe, based on the amount ...
The most important questions to study for the exam
... The correct answers are written in bold, italic and underlined. The most important questions to study for the exam are highlighted. 1. In the spectrum of a particular star, helium absorption lines are stronger than hydrogen absorption lines, and there are very few spectral lines present from any oth ...
... The correct answers are written in bold, italic and underlined. The most important questions to study for the exam are highlighted. 1. In the spectrum of a particular star, helium absorption lines are stronger than hydrogen absorption lines, and there are very few spectral lines present from any oth ...
Student Exploration Sheet: Growing Plants
... Gizmo Warm-up The interior of a star produces a continuous spectrum of light, like a rainbow. Cooler gases in the outer layers of the star absorb certain wavelengths of light, causing dark lines to appear in the spectrum. The resulting absorption spectrum can tell astronomers a great deal about the ...
... Gizmo Warm-up The interior of a star produces a continuous spectrum of light, like a rainbow. Cooler gases in the outer layers of the star absorb certain wavelengths of light, causing dark lines to appear in the spectrum. The resulting absorption spectrum can tell astronomers a great deal about the ...
Document
... • Neither astronomer had enough evidence to win the argument • Later HUBBLE found a Cepheid variable in a spiral nebula, Andromeda. • Hubble measured the distance from Earth star. • It was further than any star in the Milky Way galaxy • He concluded that the star was in a separate galaxy • Cepheid ...
... • Neither astronomer had enough evidence to win the argument • Later HUBBLE found a Cepheid variable in a spiral nebula, Andromeda. • Hubble measured the distance from Earth star. • It was further than any star in the Milky Way galaxy • He concluded that the star was in a separate galaxy • Cepheid ...
Chapter 10: Measuring the Stars - Otto
... • Each letter has 10 subdivisions, 0 - 9 • 0 is hottest, 9 is coolest, within letter class • Sun is G2 (cooler than G1, hotter than G3) ...
... • Each letter has 10 subdivisions, 0 - 9 • 0 is hottest, 9 is coolest, within letter class • Sun is G2 (cooler than G1, hotter than G3) ...
3 Nightly Motions
... If a star is far enough to the north: It will not rise or set at all! Its path will simply carry it around the North Star in approximately 24 hours, always staying above the horizon. ...
... If a star is far enough to the north: It will not rise or set at all! Its path will simply carry it around the North Star in approximately 24 hours, always staying above the horizon. ...
The Scales of Things
... Cepheid variable stars are pulsating stars, named after the brightest member of the class, Delta Cephei. Cepheids are brightest when they are hottest, close to the minimum size. Since all Cepheids are about the same temperature, the size of a Cepheid determines its luminosity. Thus there is a per ...
... Cepheid variable stars are pulsating stars, named after the brightest member of the class, Delta Cephei. Cepheids are brightest when they are hottest, close to the minimum size. Since all Cepheids are about the same temperature, the size of a Cepheid determines its luminosity. Thus there is a per ...
The Extragalactic Distance Database: Color–Magnitude Diagrams
... footprint of the observations used in our analysis is highlighted in yellow. The red boxes represent the footprint of another ACS observation of the galaxy. Footprints of observations other than those used for the production of the galaxy’s CMD often appear in these images, but those that are used a ...
... footprint of the observations used in our analysis is highlighted in yellow. The red boxes represent the footprint of another ACS observation of the galaxy. Footprints of observations other than those used for the production of the galaxy’s CMD often appear in these images, but those that are used a ...
The Kunlun Infrared Sky Survey
... discover the dustiest cases Only OH/IR stars (Wood et al. 1992) discovered at radio wavelengths have been available to elucidate the terminal phase before the star becomes a PN. With K < 17.5 AST3-3IR can survey LMC/SMC to tip of RGB. ...
... discover the dustiest cases Only OH/IR stars (Wood et al. 1992) discovered at radio wavelengths have been available to elucidate the terminal phase before the star becomes a PN. With K < 17.5 AST3-3IR can survey LMC/SMC to tip of RGB. ...
Lecture
... • First stage: all stars start fusing hydrogen (H) to make helium (He) • This stage is considered to be the longest stage in a star’s lifetime ( 90% of its total lifespan) • Second stage: Fusing of helium (He) to make carbon (C) • The life of some stars (like our Sun) stops after this stage, but ot ...
... • First stage: all stars start fusing hydrogen (H) to make helium (He) • This stage is considered to be the longest stage in a star’s lifetime ( 90% of its total lifespan) • Second stage: Fusing of helium (He) to make carbon (C) • The life of some stars (like our Sun) stops after this stage, but ot ...
Stars: some basic characteristics
... Recall that the emission/absorption features can be taken as chemical fingerprints: for instance, if there is a strong Hydrogen absorption feature, then you would expect that there is a lot of hydrogen in the star. ...
... Recall that the emission/absorption features can be taken as chemical fingerprints: for instance, if there is a strong Hydrogen absorption feature, then you would expect that there is a lot of hydrogen in the star. ...
Stellar Evolution
... The following series of H–R diagrams shows how stars of the same age, but different masses, appear as the cluster as a whole ages. After 107 years, some of the most massive stars have already left the main sequence, while many of the least massive have not even reached it yet. Note that the lo ...
... The following series of H–R diagrams shows how stars of the same age, but different masses, appear as the cluster as a whole ages. After 107 years, some of the most massive stars have already left the main sequence, while many of the least massive have not even reached it yet. Note that the lo ...
Lecture 13: The Stars –
... It orbits its star once every 36.6 Earth days at a distance of just 13 million miles (1 Astronomical Unit = 92955 887.6 miles) Is this exoplanet closer to its sun than we are to our Sun, or farther away? Whose LAW tells you? ...
... It orbits its star once every 36.6 Earth days at a distance of just 13 million miles (1 Astronomical Unit = 92955 887.6 miles) Is this exoplanet closer to its sun than we are to our Sun, or farther away? Whose LAW tells you? ...
Foundations III The Stars
... It orbits its star once every 36.6 Earth days at a distance of just 13 million miles (1 Astronomical Unit = 92955 887.6 miles) Is this exoplanet closer to its sun than we are to our Sun, or farther away? Whose LAW tells you? ...
... It orbits its star once every 36.6 Earth days at a distance of just 13 million miles (1 Astronomical Unit = 92955 887.6 miles) Is this exoplanet closer to its sun than we are to our Sun, or farther away? Whose LAW tells you? ...
Stellar Spectral Classes
... The constellation Cassiopeia contains another star with an apparent magnitude of 2.2, absolute magnitude of –4.6 and a surface temperature of 12 000 K. Calculate, for this star, ...
... The constellation Cassiopeia contains another star with an apparent magnitude of 2.2, absolute magnitude of –4.6 and a surface temperature of 12 000 K. Calculate, for this star, ...
The James Webb Space Telescope: A Vision for the Future
... Longer wavelengths of light, such as infrared, result in lower-resolution images. To improve image sharpness, astronomers need a large mirror to collect a lot of light. The bigger the mirror, the more light it can collect. Webb will be able to see back to a few hundred million years after the Big Ba ...
... Longer wavelengths of light, such as infrared, result in lower-resolution images. To improve image sharpness, astronomers need a large mirror to collect a lot of light. The bigger the mirror, the more light it can collect. Webb will be able to see back to a few hundred million years after the Big Ba ...
How Big is the Universe
... the sky than are visible to the naked eye. Later, astronomers learned they were part of the Milky Way Galaxy. They also observed many fuzzy, cloudy looking patches. They were called nebulae. This is the Latin word for clouds. Some of them appeared to be giant clouds of gas and dust inside the Milky ...
... the sky than are visible to the naked eye. Later, astronomers learned they were part of the Milky Way Galaxy. They also observed many fuzzy, cloudy looking patches. They were called nebulae. This is the Latin word for clouds. Some of them appeared to be giant clouds of gas and dust inside the Milky ...
Lecture 18, Gravitational Waves, Future Missions and
... Gravitational waves are often described as ripples in space-time. In general relativity, mass leads to a curvature of space-time. Gravity waves are produced by accelerating masses (if the motion is not perfectly symmetric). Gravity waves have not yet been detected, though we do have indirect evidenc ...
... Gravitational waves are often described as ripples in space-time. In general relativity, mass leads to a curvature of space-time. Gravity waves are produced by accelerating masses (if the motion is not perfectly symmetric). Gravity waves have not yet been detected, though we do have indirect evidenc ...
main sequence
... This radius enfolds the singularity in a zone of blackness - in other words, it makes a black hole black. It gives the black hole a visible surface, which is known as the event horizon. This is not a solid surface, though. It is simply the "point of no return" for anything that approaches the black ...
... This radius enfolds the singularity in a zone of blackness - in other words, it makes a black hole black. It gives the black hole a visible surface, which is known as the event horizon. This is not a solid surface, though. It is simply the "point of no return" for anything that approaches the black ...
Using AO to Measure the Star Formation Histories of Massive Galaxies
... The age and metallicity distributions of stars in bulges and disks are sensitive indicators of galaxy formation physics. Resolved stellar populations can be used to measure the entire star formation and chemical enrichment histories of galaxies. Spatial resolution is the most critical capability nee ...
... The age and metallicity distributions of stars in bulges and disks are sensitive indicators of galaxy formation physics. Resolved stellar populations can be used to measure the entire star formation and chemical enrichment histories of galaxies. Spatial resolution is the most critical capability nee ...
Spying into the lives of the stars
... A: The sun (a normal young star) B: A planetary nebula (the leftovers after the death of a star like the sun) C: A human ( inhabitant of a planet around a normal young star ) D: A supernova (the leftovers after the death of a star BIGGER than the sun) There is also a key that tells you which color r ...
... A: The sun (a normal young star) B: A planetary nebula (the leftovers after the death of a star like the sun) C: A human ( inhabitant of a planet around a normal young star ) D: A supernova (the leftovers after the death of a star BIGGER than the sun) There is also a key that tells you which color r ...
Determination of spiral orbits with constant tangential velocity
... laws of gravity, one comes across a surprising contradiction. The Newtonian equations of motion show that the stars that are located far away from the center have to move more slowly than those located closer to the center. Lower speeds are expected again only very close to the center, because the c ...
... laws of gravity, one comes across a surprising contradiction. The Newtonian equations of motion show that the stars that are located far away from the center have to move more slowly than those located closer to the center. Lower speeds are expected again only very close to the center, because the c ...
Slide 1
... they burned hydrogen into helium. After burning helium into carbon, stars run out of fuel and collapse into white dwarf stars, producing beautiful planetary nebulae in the process. ...
... they burned hydrogen into helium. After burning helium into carbon, stars run out of fuel and collapse into white dwarf stars, producing beautiful planetary nebulae in the process. ...
The Northern Winter Constellations - Science
... The Constellations of the Winter Sky If you live in the northern latitudes and you scan the sky from the southern horizon to the region overhead, you should be able to see the following constellations on a clear winter night: Orion the Hunter, Canis Major the Great Dog, Canis Minor the Little Dog, T ...
... The Constellations of the Winter Sky If you live in the northern latitudes and you scan the sky from the southern horizon to the region overhead, you should be able to see the following constellations on a clear winter night: Orion the Hunter, Canis Major the Great Dog, Canis Minor the Little Dog, T ...
The phenomena of astrophysical masers are not new by any means
... The discovery of naturally occurring masers has created new opportunities for exploring the universe. They provide the ability to see into the center of some galaxies obscured by dust and gas. The discovery of water masers in galaxies billions of light years away showed that water molecules existed ...
... The discovery of naturally occurring masers has created new opportunities for exploring the universe. They provide the ability to see into the center of some galaxies obscured by dust and gas. The discovery of water masers in galaxies billions of light years away showed that water molecules existed ...
H II region
An H II region is a large, low-density cloud of partially ionized gas in which star formation has recently taken place. The short-lived blue stars forged in these regions emit copious amounts of ultraviolet light that ionize the surrounding gas. H II regions—sometimes several hundred light-years across—are often associated with giant molecular clouds. The first known H II region was the Orion Nebula, which was discovered in 1610 by Nicolas-Claude Fabri de Peiresc.H II regions are named for the large amount of ionised atomic hydrogen they contain, referred to as H II, pronounced H-two by astronomers (an H I region being neutral atomic hydrogen, and H2 being molecular hydrogen). Such regions have extremely diverse shapes, because the distribution of the stars and gas inside them is irregular. They often appear clumpy and filamentary, sometimes showing bizarre shapes such as the Horsehead Nebula. H II regions may give birth to thousands of stars over a period of several million years. In the end, supernova explosions and strong stellar winds from the most massive stars in the resulting star cluster will disperse the gases of the H II region, leaving behind a cluster of birthed stars such as the Pleiades.H II regions can be seen to considerable distances in the universe, and the study of extragalactic H II regions is important in determining the distance and chemical composition of other galaxies. Spiral and irregular galaxies contain many H II regions, while elliptical galaxies are almost devoid of them. In the spiral galaxies, including the Milky Way, H II regions are concentrated in the spiral arms, while in the irregular galaxies they are distributed chaotically. Some galaxies contain huge H II regions, which may contain tens of thousands of stars. Examples include the 30 Doradus region in the Large Magellanic Cloud and NGC 604 in the Triangulum Galaxy.