... around 280 parts per million (ppm) to around 380 ppm now. Studies of ice core show that concentrations of CO2 have not been so high for nearly half a million years. At the current rate of increase, they will have reached 800 ppm by the end of the 21st century! Beyond 550 ppm it would not be liveable ...
Astronomy 160: Frontiers and Controversies in Astrophysics
... f) The faintest galaxies observed by the Hubble Space Telescope have apparent magnitudes around 30. Suppose these galaxies are ≈ 3 gigaparsecs away (3 × 109 parsecs). Assuming every star in these galaxies emits about the same amount of light as the Sun (a false assumption, but let’s make it just the ...
... f) The faintest galaxies observed by the Hubble Space Telescope have apparent magnitudes around 30. Suppose these galaxies are ≈ 3 gigaparsecs away (3 × 109 parsecs). Assuming every star in these galaxies emits about the same amount of light as the Sun (a false assumption, but let’s make it just the ...
IR Universe
... star cluster in the Orion Nebula, was part of a survey done at the United Kingdom Infrared Telescope ( UKIRT ) in which over 100 brown dwarf candidates were identified in the infrared. ...
... star cluster in the Orion Nebula, was part of a survey done at the United Kingdom Infrared Telescope ( UKIRT ) in which over 100 brown dwarf candidates were identified in the infrared. ...
Pulsating variable stars and the Hertzsprung
... continuous spectrum. Later, Joseph von Fraunhofer (1787-1826) observed the Solar spectra more detailed and found that the dark gaps are different in strength. German physicist Gustav Kirchhoff (1824-1887) published his fundamental work in 1859, which explained the nature of the Fraunhofer lines in t ...
... continuous spectrum. Later, Joseph von Fraunhofer (1787-1826) observed the Solar spectra more detailed and found that the dark gaps are different in strength. German physicist Gustav Kirchhoff (1824-1887) published his fundamental work in 1859, which explained the nature of the Fraunhofer lines in t ...
Downloadable Full Text
... confirmed to be one of the most metal-poor galaxies known14. On 1-4 Oct 2015, we obtained high-resolution spectra of the nine brightest member stars in Ret II (see Table 1, Extended Data Figure 1). The abundances of non-neutron-capture elements in all nine stars are consistent with abundances in oth ...
... confirmed to be one of the most metal-poor galaxies known14. On 1-4 Oct 2015, we obtained high-resolution spectra of the nine brightest member stars in Ret II (see Table 1, Extended Data Figure 1). The abundances of non-neutron-capture elements in all nine stars are consistent with abundances in oth ...
Orion-pr-2009 - Astrophysics Research Institute
... perhaps the Orion Nebula as a vaguely fuzzy patch around the sword. What your eye does not see is an enormous cloud of molecules and dust particles that hide a vast region where young stars are currently being born. On the sky, the region – known to astronomers as the Orion Molecular Cloud -- is mor ...
... perhaps the Orion Nebula as a vaguely fuzzy patch around the sword. What your eye does not see is an enormous cloud of molecules and dust particles that hide a vast region where young stars are currently being born. On the sky, the region – known to astronomers as the Orion Molecular Cloud -- is mor ...
Ay 112 Midterm review
... Depending on the temperature, different ionization states are present and lines have different strengths in the spectrum. This gives us another way to determine the photospheric temperature (besides Wiens law ...
... Depending on the temperature, different ionization states are present and lines have different strengths in the spectrum. This gives us another way to determine the photospheric temperature (besides Wiens law ...
May 2017 - Bays Mountain Park
... please RSVP no later than Friday, May 5th! The cost of the two night camping event is only $30 USD per family, and includes dinner on Friday, three meals on Saturday, and a farewell ...
... please RSVP no later than Friday, May 5th! The cost of the two night camping event is only $30 USD per family, and includes dinner on Friday, three meals on Saturday, and a farewell ...
Section2_Coordinates.. - Faculty Web Sites at the University of Virginia
... Proper Motions - reflect the intrinsic motions of stars as these orbit around the Galactic center. - include: star’s motion, Sun’s motion, and the distance between the star and the Sun. - they are an angular measurement on the sky, i.e., perpendicular to the line of sight; that’s why they are also ...
... Proper Motions - reflect the intrinsic motions of stars as these orbit around the Galactic center. - include: star’s motion, Sun’s motion, and the distance between the star and the Sun. - they are an angular measurement on the sky, i.e., perpendicular to the line of sight; that’s why they are also ...
two dozen compact sources and a massive disk
... with 25 members: NGC 6334 I(N) • We perform the first dynamical mass measurement using hot core line emission (410 ± 260 M), compatible with dust estimates • We analyze its structure using tools developed for infrared clusters (Qparameter of MST) • Dust masses are consistent with disks around inter ...
... with 25 members: NGC 6334 I(N) • We perform the first dynamical mass measurement using hot core line emission (410 ± 260 M), compatible with dust estimates • We analyze its structure using tools developed for infrared clusters (Qparameter of MST) • Dust masses are consistent with disks around inter ...
PSC100 Summary Chapters 10 to Chapter 20
... so close to us that a few astronomers consider them to be satellites of the milky Way. These two galaxies are called the Large and the Small Magellanic Clouds because of their nebular appearance when they were seen with the naked eye by Magellan and his crew as they sailed the southern seas. The Mag ...
... so close to us that a few astronomers consider them to be satellites of the milky Way. These two galaxies are called the Large and the Small Magellanic Clouds because of their nebular appearance when they were seen with the naked eye by Magellan and his crew as they sailed the southern seas. The Mag ...
Feb 2015 - Bluewater Astronomical Society
... With the arrival of Comet Lovejoy, a recent discussion came up as to how many comets would be observable in an average person’s lifetime. ...
... With the arrival of Comet Lovejoy, a recent discussion came up as to how many comets would be observable in an average person’s lifetime. ...
PPT - ALFALFA survey
... • The Arecibo Dual Beam Survey (ADBS) was carried out by Rosenberg & Schneider (2000). It was a drift-scan survey taken in a series of declination strips with the Arecibo 305-m telescope. The velocity limit of the ADBS is 8000 km/s (it is volume limited!). The full ADBS sample includes 265 galaxies ...
... • The Arecibo Dual Beam Survey (ADBS) was carried out by Rosenberg & Schneider (2000). It was a drift-scan survey taken in a series of declination strips with the Arecibo 305-m telescope. The velocity limit of the ADBS is 8000 km/s (it is volume limited!). The full ADBS sample includes 265 galaxies ...
powerpoint - High Energy Physics at Wayne State
... Astronomy is a Time Machine When we observe a star that is 100 light-years distant, then the light took 100 years to reach us. We are seeing it as it was 100 years ago. The nearest galaxy is about a million light-years from Earth. We see it as it was 1 million years ago. The most distant objects ob ...
... Astronomy is a Time Machine When we observe a star that is 100 light-years distant, then the light took 100 years to reach us. We are seeing it as it was 100 years ago. The nearest galaxy is about a million light-years from Earth. We see it as it was 1 million years ago. The most distant objects ob ...
BIRTH OF CHRIST RECALCULATED Preliminary Considerations
... B. Lunar eclipses that were observable over Palestine in the period from 7 to 1BC were four: March 23, 5BC, a total eclipse; September 15, 5BC, a total eclipse; March 13, 4BC, a partial eclipse; January 10, 1BC, a total eclipse; for the other years in the time-frame, there were no lunar eclipses obs ...
... B. Lunar eclipses that were observable over Palestine in the period from 7 to 1BC were four: March 23, 5BC, a total eclipse; September 15, 5BC, a total eclipse; March 13, 4BC, a partial eclipse; January 10, 1BC, a total eclipse; for the other years in the time-frame, there were no lunar eclipses obs ...
Stellar Evolution
... Learning Astronomy from History Sirius is the brightest star in the northern sky and has been recorded throughout history But there is a mystery! All sightings recorded between about 100 BCE and 200 CE describe it as being red It is now blue-white. Why? Could there have been an intervening dust clo ...
... Learning Astronomy from History Sirius is the brightest star in the northern sky and has been recorded throughout history But there is a mystery! All sightings recorded between about 100 BCE and 200 CE describe it as being red It is now blue-white. Why? Could there have been an intervening dust clo ...
Homework #7 (Ch. 19)
... 9. Chaisson Review and Discussion 19.17 What do star clusters and associations have to do with star formation? 10. Chaisson Review and Discussion 19.18 Compare and contrast the observed properties of open star clusters and globular star clusters. 11. Chaisson Review and Discussion 19.19 How can we ...
... 9. Chaisson Review and Discussion 19.17 What do star clusters and associations have to do with star formation? 10. Chaisson Review and Discussion 19.18 Compare and contrast the observed properties of open star clusters and globular star clusters. 11. Chaisson Review and Discussion 19.19 How can we ...
The Interstellar Medium Chapter 10
... The space between the stars is not completely empty, but filled with very dilute gas and dust, producing some of the most beautiful objects in the sky. We are interested in the interstellar medium because a) dense interstellar clouds are the birth place of stars b) Dark clouds alter and absorb the l ...
... The space between the stars is not completely empty, but filled with very dilute gas and dust, producing some of the most beautiful objects in the sky. We are interested in the interstellar medium because a) dense interstellar clouds are the birth place of stars b) Dark clouds alter and absorb the l ...
Ursa Major
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.