Beginning of the Universe Classwork Name: 6th Grade PSI Science
... Name: __________________________ ...
... Name: __________________________ ...
Selected Physical and Astronomical Constants Conversion Factors
... does the orbit of a stone around a black hole differ from the orbit of a planet around our Sun? Newton says a planet stays in orbit because the Sun exerts a gravitational force on it. How does Einstein explain this orbit? If Newton and Einstein disagree, how do we decide between them? How close to a ...
... does the orbit of a stone around a black hole differ from the orbit of a planet around our Sun? Newton says a planet stays in orbit because the Sun exerts a gravitational force on it. How does Einstein explain this orbit? If Newton and Einstein disagree, how do we decide between them? How close to a ...
Chandra Emission Line Diagnostics of Sco
... been discovered that hot stars are strong x-ray sources. New models are being created to explain these data. Our sun produces x-rays through a magnetic dynamo created by the interaction of convection and rotation. It was theorized that hot stars did not have this convective envelope. However, some r ...
... been discovered that hot stars are strong x-ray sources. New models are being created to explain these data. Our sun produces x-rays through a magnetic dynamo created by the interaction of convection and rotation. It was theorized that hot stars did not have this convective envelope. However, some r ...
1b91: answers to problem sheet no 1
... •Jupiter has four moons (known as the Galilean satellites) which are in orbit around it - a Copernican system in miniature ...
... •Jupiter has four moons (known as the Galilean satellites) which are in orbit around it - a Copernican system in miniature ...
Your Title Here
... the brightest star is Regulus. It is a triple system of a relatively small blue star, an orange sunlike star and a red dwarf. ...
... the brightest star is Regulus. It is a triple system of a relatively small blue star, an orange sunlike star and a red dwarf. ...
Nova
... Roche lobe, gas moves into the Roche lobe of the companion star and is pulled in toward that star. This process of mass transfer is referred to as Roche lobe overflow. Binaries in this stage of mass transfer are called semi-detached binaries, because only one of the stars is actually in contact with ...
... Roche lobe, gas moves into the Roche lobe of the companion star and is pulled in toward that star. This process of mass transfer is referred to as Roche lobe overflow. Binaries in this stage of mass transfer are called semi-detached binaries, because only one of the stars is actually in contact with ...
Lecture 17: Black Holes
... Alternative hypothesis: interacting, massive dark matter particle • Dark matter particles are captured by stars, and settle in the center to a thermal distribution. • If sufficient dark matter accumulates, it collapses into a self-gravitating object in the star center. • If the dark matter mass is ...
... Alternative hypothesis: interacting, massive dark matter particle • Dark matter particles are captured by stars, and settle in the center to a thermal distribution. • If sufficient dark matter accumulates, it collapses into a self-gravitating object in the star center. • If the dark matter mass is ...
! • Supermassive Black Holes (SMBH) at Work: Effects of
... the stellar light 1). To compute •NGC4342 and (Fig. NGC4291 mass profile of NGC4342 we assume tha host dark matter halos in hydrostatic equlibrium (Mathews 1978 1985; Humphrey et al. 2006) and use the •measured using X-ray gas tion: ...
... the stellar light 1). To compute •NGC4342 and (Fig. NGC4291 mass profile of NGC4342 we assume tha host dark matter halos in hydrostatic equlibrium (Mathews 1978 1985; Humphrey et al. 2006) and use the •measured using X-ray gas tion: ...
binary stars
... The angular separations and orbital paths are only apparent because in general the orbit is inclined to the plane of the sky, so we see the orbit in projection ...
... The angular separations and orbital paths are only apparent because in general the orbit is inclined to the plane of the sky, so we see the orbit in projection ...
The Sun and the Stars
... The angular separations and orbital paths are only apparent because in general the orbit is inclined to the plane of the sky, so we see the orbit in projection ...
... The angular separations and orbital paths are only apparent because in general the orbit is inclined to the plane of the sky, so we see the orbit in projection ...
sun_parallax2
... Visual binaries – Stars that are far enough apart that they can be seen as separate stars through a telescope. They typically have orbital periods that are hundreds of years long. ...
... Visual binaries – Stars that are far enough apart that they can be seen as separate stars through a telescope. They typically have orbital periods that are hundreds of years long. ...
Stellar Evolution after the Main Sequence
... actually the rarity. Most stars are found with one or more companions. • Their spacing is anywhere from about 2000 AU down to 'almost touching' • For simplicity, let's consider only binary star systems ...
... actually the rarity. Most stars are found with one or more companions. • Their spacing is anywhere from about 2000 AU down to 'almost touching' • For simplicity, let's consider only binary star systems ...
Details of the measurement technique
... masses so precisely because our measurements are based on the motion of gas very close to the black hole, less than a light-year in many cases. Compared to techniques using optical telescopes, where the black hole mass can only be determined within a factor of 2 or so in the best cases, here we can ...
... masses so precisely because our measurements are based on the motion of gas very close to the black hole, less than a light-year in many cases. Compared to techniques using optical telescopes, where the black hole mass can only be determined within a factor of 2 or so in the best cases, here we can ...
Galaxy Formation and Evolution Open Problems
... • Do galaxies, such as the Milky Way, form from accumulation of many smaller systems which have already initiated star formation? • Does star formation begin in a gravitational potential well in which much of the gas is already accumulated? • What is the nature and composition of matter in the galac ...
... • Do galaxies, such as the Milky Way, form from accumulation of many smaller systems which have already initiated star formation? • Does star formation begin in a gravitational potential well in which much of the gas is already accumulated? • What is the nature and composition of matter in the galac ...
Here
... This region of a molecular cloud shows several dense clumps of gas which over the next 100,000 years may collapse to form more stars. The properties of these clumps such as their size, density, temperature, chemistry and angular momentum tell us the initial conditions for star formation. We measure ...
... This region of a molecular cloud shows several dense clumps of gas which over the next 100,000 years may collapse to form more stars. The properties of these clumps such as their size, density, temperature, chemistry and angular momentum tell us the initial conditions for star formation. We measure ...
Presentation - Harvard-Smithsonian Center for Astrophysics
... forbidden lines: Ca VII, Fe VII, Mg V, Mg VI, Si VII, and for the first time, 2 transitions of Mg VII between terms of the 2s 2 2p 2 3P-1D configuration (Young, P. et al. 2006). ...
... forbidden lines: Ca VII, Fe VII, Mg V, Mg VI, Si VII, and for the first time, 2 transitions of Mg VII between terms of the 2s 2 2p 2 3P-1D configuration (Young, P. et al. 2006). ...
Red Supergiants as the Progenitors of Type IIP Supernova
... and while extending into the helium shell, fragment into ballistically moving clumps and filaments that propagate faster than the expansion of their environment. While for a 2D model with explosion energy around 1.8× 1051 erg the Si and Ni containing structures still move with nearly 4000 km s-1 (oxy ...
... and while extending into the helium shell, fragment into ballistically moving clumps and filaments that propagate faster than the expansion of their environment. While for a 2D model with explosion energy around 1.8× 1051 erg the Si and Ni containing structures still move with nearly 4000 km s-1 (oxy ...
Exam # 2 – Tue 11/08/2011
... 24. The fusion of four hydrogen nuclei into a helium nucleus releases energy because A. fusion only occurs at high temperatures B. a helium nucleus has two protons, hydrogen has only one C. a helium nucleus weighs less than four hydrogen nuclei D. fusion can only occur in the centers of stars E. hel ...
... 24. The fusion of four hydrogen nuclei into a helium nucleus releases energy because A. fusion only occurs at high temperatures B. a helium nucleus has two protons, hydrogen has only one C. a helium nucleus weighs less than four hydrogen nuclei D. fusion can only occur in the centers of stars E. hel ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.