Stars - HMXEarthScience
... Sequence” star during which size, the star grows in size as it uses up its fuel 5. Eventually when the hydrogen fuel becomes exhausted, the star expands greatly becoming a giant or a supergiant ...
... Sequence” star during which size, the star grows in size as it uses up its fuel 5. Eventually when the hydrogen fuel becomes exhausted, the star expands greatly becoming a giant or a supergiant ...
Section9 - University of Chicago
... last ionized at the surface of last scattering.) In fact, the Universe we see around us today has neutral hydrogen only in dense regions (the disks of spiral galaxies for example) that are self-shielded from these ionizing photons. The outskirts of galaxies and the gas in clusters and groups (the in ...
... last ionized at the surface of last scattering.) In fact, the Universe we see around us today has neutral hydrogen only in dense regions (the disks of spiral galaxies for example) that are self-shielded from these ionizing photons. The outskirts of galaxies and the gas in clusters and groups (the in ...
Galaxy Notes File
... NGC is 80 million light years, which Mkn 205 is 14 times farther away at a distance of 1 billion light year. The very distant quasar is nearly as bright as the much closer galaxy. The extraordinary brightness of quasars, which is a blending of the term quasi-stellar radio source, indicates that some ...
... NGC is 80 million light years, which Mkn 205 is 14 times farther away at a distance of 1 billion light year. The very distant quasar is nearly as bright as the much closer galaxy. The extraordinary brightness of quasars, which is a blending of the term quasi-stellar radio source, indicates that some ...
How Big is the Universe
... attached to a sphere around Earth. This idea held for many centuries. Galileo used his telescope, an instrument used to view distant objects. He saw there were more stars in ...
... attached to a sphere around Earth. This idea held for many centuries. Galileo used his telescope, an instrument used to view distant objects. He saw there were more stars in ...
Messier Galaxies of #202541
... Surface brightness plays a large role in galaxy observing. Published magnitude values are an important tool used to indicate how an object will look. However, when it is finally located, the object’s brightness may appear much differently than expected. One reason is that the integrated magnitude va ...
... Surface brightness plays a large role in galaxy observing. Published magnitude values are an important tool used to indicate how an object will look. However, when it is finally located, the object’s brightness may appear much differently than expected. One reason is that the integrated magnitude va ...
Small Wonders: Canes Venatici
... on by both Ursa Major and Bootes, Canes is located in a somewhat barren section of the night sky. Canes (whose name means The Hunting Dogs) has been seen as Bootes pets for at least several hundred years, but the constellation may not have been "stand alone" until sometime in the late 17th century w ...
... on by both Ursa Major and Bootes, Canes is located in a somewhat barren section of the night sky. Canes (whose name means The Hunting Dogs) has been seen as Bootes pets for at least several hundred years, but the constellation may not have been "stand alone" until sometime in the late 17th century w ...
Interacting Galaxies
... can lead to spectacular mergers and spawn vast amounts of new star formation. Astronomers estimate that in the nearby universe, 1 out of every 20 gas-rich disk galaxies, like our Milky Way galaxy, is in the act of colliding. Galaxy mergers were much more common in the past, however, when the expandi ...
... can lead to spectacular mergers and spawn vast amounts of new star formation. Astronomers estimate that in the nearby universe, 1 out of every 20 gas-rich disk galaxies, like our Milky Way galaxy, is in the act of colliding. Galaxy mergers were much more common in the past, however, when the expandi ...
Synthetic color-magnitude diagrams: the ingredients
... assume an instantaneous burst of star formation. Then the SFR function is represented by a Dirac delta function; In a CSP such as a galaxy, star formation takes place over a finite period of time; so it can be a complex function of the time… On generic ground, one can expect that the star-formation ...
... assume an instantaneous burst of star formation. Then the SFR function is represented by a Dirac delta function; In a CSP such as a galaxy, star formation takes place over a finite period of time; so it can be a complex function of the time… On generic ground, one can expect that the star-formation ...
How fast do stars form out of the ISM?
... How fast do stars form out of the ISM? Let's consider the gravitational collapse of a cloud into globules and further into a proto-star. The molecular clouds are very dark because they are cold (~10-40 K) and dense (~1000 grains per centimeter cubed). Gravity is an attractive force between any two m ...
... How fast do stars form out of the ISM? Let's consider the gravitational collapse of a cloud into globules and further into a proto-star. The molecular clouds are very dark because they are cold (~10-40 K) and dense (~1000 grains per centimeter cubed). Gravity is an attractive force between any two m ...
Starbirth - Lincoln-Sudbury Regional High School
... actually “see” inside the cloud. This region has recently been observed with the VLT* at near-infrared wavelengths, which can penetrate the dense dust and reveal the newly born stars. Very young, relatively massive stars are found at the tips of two of the main three pillars, and about a dozen lower ...
... actually “see” inside the cloud. This region has recently been observed with the VLT* at near-infrared wavelengths, which can penetrate the dense dust and reveal the newly born stars. Very young, relatively massive stars are found at the tips of two of the main three pillars, and about a dozen lower ...
The Rocket Science of Launching Stellar Disks
... – Driven by line-scattering of star’s radiation – Rotation can lead to Wind Compressed Disk (WCD) – But still lacks angular momentum for orbit ...
... – Driven by line-scattering of star’s radiation – Rotation can lead to Wind Compressed Disk (WCD) – But still lacks angular momentum for orbit ...
Star Planet - Stony Brook Astronomy
... C. The image of the supernova dispersing will not reach us for another 2.6 million years. D. We will never see the supernova remnant because it has already dispersed. ...
... C. The image of the supernova dispersing will not reach us for another 2.6 million years. D. We will never see the supernova remnant because it has already dispersed. ...
young science communicator`s competition
... be 300 000 light years acrossNARRATOR: [Interrupting] May I remind the audience that a light year is a distance measure astronomers use, being the distance light travels in one year. One light year is ten trillion kilometres, making 300 000 light years an enormous distance! If Shapley's estimate is ...
... be 300 000 light years acrossNARRATOR: [Interrupting] May I remind the audience that a light year is a distance measure astronomers use, being the distance light travels in one year. One light year is ten trillion kilometres, making 300 000 light years an enormous distance! If Shapley's estimate is ...
ASTR 105 Intro Astronomy: The Solar System
... even light takes a lot of time to travel between the stars • This means that what we SEE in the distant universe is light that has traveled a long time. • Our image of the universe is a delayed image. In looking out into space, we are looking back in time! – The farther away we look in distance, ...
... even light takes a lot of time to travel between the stars • This means that what we SEE in the distant universe is light that has traveled a long time. • Our image of the universe is a delayed image. In looking out into space, we are looking back in time! – The farther away we look in distance, ...
Lecture 12
... In astronomy we are always looking at things as they were in the past. The light from a star 30pc away left it about 100 yrs ago (30pc~100 lyr). The light from the Andromeda galaxy left it about 1.5Myr ago, and the light from something in the Virgo Cluster about 65 Myr ago (about when the dinosaurs ...
... In astronomy we are always looking at things as they were in the past. The light from a star 30pc away left it about 100 yrs ago (30pc~100 lyr). The light from the Andromeda galaxy left it about 1.5Myr ago, and the light from something in the Virgo Cluster about 65 Myr ago (about when the dinosaurs ...
Searching for the Most Distant Black Holes in the Early
... – should be strong X-ray sources (from hot gas) – should be strong infrared sources (from hot dust) – should have very faint (or none) optical emission ...
... – should be strong X-ray sources (from hot gas) – should be strong infrared sources (from hot dust) – should have very faint (or none) optical emission ...
Homework #7 (Ch. 19)
... 10 million K, which is sufficient to initiate hydrogen fusion. The object is now a star. 3. Chaisson Review and Discussion 19.3 What is the role of rotation in the process of stellar birth? (3 points) As an interstellar cloud collapses, it must spin faster as it conserves angular momentum. This can ...
... 10 million K, which is sufficient to initiate hydrogen fusion. The object is now a star. 3. Chaisson Review and Discussion 19.3 What is the role of rotation in the process of stellar birth? (3 points) As an interstellar cloud collapses, it must spin faster as it conserves angular momentum. This can ...
hubble_refurb
... supersonic shock wave in the surrounding medium and making the material glow. The Hubble visible-light image reveals, deep within the remnant, a crescent-shaped cloud of pink emission from hydrogen gas and soft purple wisps that correspond to regions of glowing oxygen. A dense background of colorful ...
... supersonic shock wave in the surrounding medium and making the material glow. The Hubble visible-light image reveals, deep within the remnant, a crescent-shaped cloud of pink emission from hydrogen gas and soft purple wisps that correspond to regions of glowing oxygen. A dense background of colorful ...
Exploring The Universe
... • Irregular galaxies lack regular shapes and do not have a well-defined structure. • Some irregular galaxies may be oddly shaped because the gravitational pull of nearby galaxies distorts their spiral arms. • Contain mostly YOUNG STARS ...
... • Irregular galaxies lack regular shapes and do not have a well-defined structure. • Some irregular galaxies may be oddly shaped because the gravitational pull of nearby galaxies distorts their spiral arms. • Contain mostly YOUNG STARS ...
Lecture 5
... recent years, astronomers have developed several very reliable and independent methods of determining the distances to the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC), two of the nearby satellite galaxies of our own Milky Way Galaxy. Since the LMC and SMC contain large number of Ce ...
... recent years, astronomers have developed several very reliable and independent methods of determining the distances to the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC), two of the nearby satellite galaxies of our own Milky Way Galaxy. Since the LMC and SMC contain large number of Ce ...
Slide 1
... recent years, astronomers have developed several very reliable and independent methods of determining the distances to the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC), two of the nearby satellite galaxies of our own Milky Way Galaxy. Since the LMC and SMC contain large number of Ce ...
... recent years, astronomers have developed several very reliable and independent methods of determining the distances to the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC), two of the nearby satellite galaxies of our own Milky Way Galaxy. Since the LMC and SMC contain large number of Ce ...
Pattern speed evolution and bar reformation
... sub-units. Although this mechanism works pretty well for early-type galaxies and ellipticals, the interaction between galaxies is quite destructive for disks. To account for the high prevalence of thin disks in today’s observations, another scenario has to be invoked in parallel, namely external gas ...
... sub-units. Although this mechanism works pretty well for early-type galaxies and ellipticals, the interaction between galaxies is quite destructive for disks. To account for the high prevalence of thin disks in today’s observations, another scenario has to be invoked in parallel, namely external gas ...
Galaxies over the Latter Half of Cosmic Time
... From the new star-formation data, we find that each size of galaxy motions determined from Keck spectra, we find that only in the past few billion years have most disk galaxies (like our own Milky Way) ...
... From the new star-formation data, we find that each size of galaxy motions determined from Keck spectra, we find that only in the past few billion years have most disk galaxies (like our own Milky Way) ...
Lecture 14
... pressure of photons drives their matter into space. • Hence very large stars are not stable and quickly fall apart do to photon pressure. ...
... pressure of photons drives their matter into space. • Hence very large stars are not stable and quickly fall apart do to photon pressure. ...