
The Sun . . .
... Main Sequence: Average, ordinary stars. ~ 90% of stars are main sequence. Supergiant: 20 to 200 times larger than the Sun, but also much brighter, cooler and less dense. Dwarf: Small stars; fairly hot but very dim. Diameter is about the same as Earth, but their mass is equal to the sun . . . ...
... Main Sequence: Average, ordinary stars. ~ 90% of stars are main sequence. Supergiant: 20 to 200 times larger than the Sun, but also much brighter, cooler and less dense. Dwarf: Small stars; fairly hot but very dim. Diameter is about the same as Earth, but their mass is equal to the sun . . . ...
Astronomy 242: Review Questions #1 Distributed: February 10
... 12. You observe a sample of Cepheid variable stars in a nearby galaxy. Plotting the average apparent K-band magnitude of each one against the period of pulsation yields Fig. 3. The straight line, a least-squares fit to the data, has the equation mK = 16.40 − 3.53 log(P/day). (a) Does it seem reasona ...
... 12. You observe a sample of Cepheid variable stars in a nearby galaxy. Plotting the average apparent K-band magnitude of each one against the period of pulsation yields Fig. 3. The straight line, a least-squares fit to the data, has the equation mK = 16.40 − 3.53 log(P/day). (a) Does it seem reasona ...
test - Scioly.org
... 17. Expressed in kg, and in scientific notation, a type 1a supernova will occur when the left hand star reaches what mass? 18. This point at which a type 1a supernova occurs is named after and Indian astronomer who first predicted it in 1930. Correctly spelled, what is this point called. USE DIAGRAM ...
... 17. Expressed in kg, and in scientific notation, a type 1a supernova will occur when the left hand star reaches what mass? 18. This point at which a type 1a supernova occurs is named after and Indian astronomer who first predicted it in 1930. Correctly spelled, what is this point called. USE DIAGRAM ...
Studying the Stars
... Pogson assigned the brightest stars the first order of magnitude (magnitude = 1), and dimmer stars were 2nd, 3rd, 4th order, etc. (magnitudes = 2, 3, 4, etc.) Now that we can be more accurate in our measurements, stars can have more specific magnitudes like 1.5, 6.73, etc. and even negative numbers ...
... Pogson assigned the brightest stars the first order of magnitude (magnitude = 1), and dimmer stars were 2nd, 3rd, 4th order, etc. (magnitudes = 2, 3, 4, etc.) Now that we can be more accurate in our measurements, stars can have more specific magnitudes like 1.5, 6.73, etc. and even negative numbers ...
Astronomical Terms - Crossroads Academy
... apparent magnitude…the brightness of a star or object in space that depends on varying distances…closer but less luminous stars might “appear” brighter than farther stars that have greater “luminosity” Luminosity…the total light output of a star precession…changing of where the celestial pole point ...
... apparent magnitude…the brightness of a star or object in space that depends on varying distances…closer but less luminous stars might “appear” brighter than farther stars that have greater “luminosity” Luminosity…the total light output of a star precession…changing of where the celestial pole point ...
Stellar Evolution: After the Main Sequence
... As a cluster ages, the main sequence is “eaten away” from the upper left as stars of progressively smaller mass evolve into red giants ...
... As a cluster ages, the main sequence is “eaten away” from the upper left as stars of progressively smaller mass evolve into red giants ...
Lec 25.2- STELLAR EVOLUTION SUMMARY
... driven into atomic nuclei which are then transmuted into neutrons, creating in effect an atomic nucleus of astronomical proportions-a neutron star. A neutron star may be as small as 20 kilometers (12 miles) in diameter, with a density billions of times that of lead. A cubic centimeter of its matter ...
... driven into atomic nuclei which are then transmuted into neutrons, creating in effect an atomic nucleus of astronomical proportions-a neutron star. A neutron star may be as small as 20 kilometers (12 miles) in diameter, with a density billions of times that of lead. A cubic centimeter of its matter ...
june 2011 - Holt Planetarium
... In planetary news, Mercury is putting in an appearance in the evening sky in July. Towards the end of July, Mercury will be within 3 or 4 degrees of the 1.4 magnitude star Regulus, the brightest star in the constellation Leo. The planet will be to the left of the star, starting below it, but climbi ...
... In planetary news, Mercury is putting in an appearance in the evening sky in July. Towards the end of July, Mercury will be within 3 or 4 degrees of the 1.4 magnitude star Regulus, the brightest star in the constellation Leo. The planet will be to the left of the star, starting below it, but climbi ...
june 2011 - Holt Planetarium
... In planetary news, Mercury is putting in an appearance in the evening sky in July. Towards the end of July, Mercury will be within 3 or 4 degrees of the 1.4 magnitude star Regulus, the brightest star in the constellation Leo. The planet will be to the left of the star, starting below it, but climbi ...
... In planetary news, Mercury is putting in an appearance in the evening sky in July. Towards the end of July, Mercury will be within 3 or 4 degrees of the 1.4 magnitude star Regulus, the brightest star in the constellation Leo. The planet will be to the left of the star, starting below it, but climbi ...
Powerpoint Presentation (large file)
... are glowing, ionized clouds of gas • Emission nebulae are powered by ultraviolet light that they absorb from nearby hot stars • Reflection nebulae are produced when starlight is reflected from dust grains in the interstellar medium, producing a characteristic bluish ...
... are glowing, ionized clouds of gas • Emission nebulae are powered by ultraviolet light that they absorb from nearby hot stars • Reflection nebulae are produced when starlight is reflected from dust grains in the interstellar medium, producing a characteristic bluish ...
A Star is Born!
... are based on the evolutionary phase of a star — whether it is a dwarf, subgiant, giant, or supergiant • Main sequence → Subgiant/Red giant: From burning hydrogen in the core to burning hydrogen in a shell that surrounds an inert (i.e., non-burning) helium core • Red giant → Horizontal Branch: Helium ...
... are based on the evolutionary phase of a star — whether it is a dwarf, subgiant, giant, or supergiant • Main sequence → Subgiant/Red giant: From burning hydrogen in the core to burning hydrogen in a shell that surrounds an inert (i.e., non-burning) helium core • Red giant → Horizontal Branch: Helium ...
Stars
... • As Earth rotates, Ursa Major, Ursa Minor, and other constellations in the northern sky circle around Polaris • Because of this, they are called circumpolar constellations. • It appears that the constellations complete one full circle in the sky in about 24 hr. as Earth rotates on its axis. ...
... • As Earth rotates, Ursa Major, Ursa Minor, and other constellations in the northern sky circle around Polaris • Because of this, they are called circumpolar constellations. • It appears that the constellations complete one full circle in the sky in about 24 hr. as Earth rotates on its axis. ...
25drake3s
... The Drake Equation N=R* X fp X ne X fl X fi X fc X fL N = The number of civilizations in the galaxy R* = Number of stars in the galaxy fp = Fraction of stars with planets ne = Average number of suitable planets per star fl = Fraction of suitable planets on which life ...
... The Drake Equation N=R* X fp X ne X fl X fi X fc X fL N = The number of civilizations in the galaxy R* = Number of stars in the galaxy fp = Fraction of stars with planets ne = Average number of suitable planets per star fl = Fraction of suitable planets on which life ...
chapter 17 measuring the stars
... Dwarf: Any star with radius comparable to, or smaller than that of the Sun (including the Sun itself) ~The color of any 24, 000 K object glows white o White Dwarf: A dwarf star with sufficiently high surface temperature that it glows white ...
... Dwarf: Any star with radius comparable to, or smaller than that of the Sun (including the Sun itself) ~The color of any 24, 000 K object glows white o White Dwarf: A dwarf star with sufficiently high surface temperature that it glows white ...
The night sky - Mr. Champion
... • Even before the advent of telescopes, humans took note of star formations and have been influenced by them. • As we often do, some claimed through patterns they could see objects or people “hidden” there. • These objects are what’s known as constellations. • They aren’t necessarily found in the sa ...
... • Even before the advent of telescopes, humans took note of star formations and have been influenced by them. • As we often do, some claimed through patterns they could see objects or people “hidden” there. • These objects are what’s known as constellations. • They aren’t necessarily found in the sa ...
Study Guide for the 4TH Astronomy Exam
... Stellar Evolution The successful student will be able to… 1. Star Formation a. Describe the physical characteristics of a giant molecular cloud b. Identify the source of heating (energy production) in protostars c. Explain why more low-mass K & M main sequence stars form rather than the high-mass O ...
... Stellar Evolution The successful student will be able to… 1. Star Formation a. Describe the physical characteristics of a giant molecular cloud b. Identify the source of heating (energy production) in protostars c. Explain why more low-mass K & M main sequence stars form rather than the high-mass O ...
The Sun and Stardust
... vanadium, chromium, manganese, iron, cobalt, and nickel etc. Then massive stars (about ten times more massive than the Sun ,or even heavier) burst into what is called a supernova, spreading all of the elements that formed through their lifetime in space. These end up in large distances around what u ...
... vanadium, chromium, manganese, iron, cobalt, and nickel etc. Then massive stars (about ten times more massive than the Sun ,or even heavier) burst into what is called a supernova, spreading all of the elements that formed through their lifetime in space. These end up in large distances around what u ...
Cygnus (constellation)

Cygnus /ˈsɪɡnəs/ is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan. The swan is one of the most recognizable constellations of the northern summer and autumn, it features a prominent asterism known as the Northern Cross (in contrast to the Southern Cross). Cygnus was among the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations.Cygnus contains Deneb, one of the brightest stars in the night sky and one corner of the Summer Triangle, as well as some notable X-ray sources and the giant stellar association of Cygnus OB2. One of the stars of this association, NML Cygni, is one of the largest stars currently known. The constellation is also home to Cygnus X-1, a distant X-ray binary containing a supergiant and unseen massive companion that was the first object widely held to be a black hole. Many star systems in Cygnus have known planets as a result of the Kepler Mission observing one patch of the sky, the patch is the area around Cygnus. In addition, most of the eastern part of Cygnus is dominated by the Hercules–Corona Borealis Great Wall, a giant galaxy filament that is the largest known structure in the observable universe; covering most of the northern sky.