Basics – II. Time, Magnitudes and Spectral types
... every 400 years are omitted. This is achieved by the following recipe: • every year divisible by four is a leap year (like the Julian calendar), • but every year which is a multiple of 100 is not a leap year, • unless that year is also divisible by four, in which case, it is a leap year. So, .., 200 ...
... every 400 years are omitted. This is achieved by the following recipe: • every year divisible by four is a leap year (like the Julian calendar), • but every year which is a multiple of 100 is not a leap year, • unless that year is also divisible by four, in which case, it is a leap year. So, .., 200 ...
DTU_9e_ch12
... denotes the fraction of the orbital period from one primary minimum to the next. (a) Algol, also known as β Persei, is a semidetached binary. The deep eclipse occurs when the giant star (right) blocks the light from the smaller, but more luminous, main-sequence star. (b) β Lyrae is a semidetached bi ...
... denotes the fraction of the orbital period from one primary minimum to the next. (a) Algol, also known as β Persei, is a semidetached binary. The deep eclipse occurs when the giant star (right) blocks the light from the smaller, but more luminous, main-sequence star. (b) β Lyrae is a semidetached bi ...
Finding habitable earths around white dwarfs with a robotic
... star slightly more massive than our Sun versus time: a comparable amount of time is spent in the main sequence phase as the white dwarf phase, and the rate of change of luminosity is gradual for billions of years in both phases. The model up until the white dwarf stage is taken from1∗ , while the wh ...
... star slightly more massive than our Sun versus time: a comparable amount of time is spent in the main sequence phase as the white dwarf phase, and the rate of change of luminosity is gradual for billions of years in both phases. The model up until the white dwarf stage is taken from1∗ , while the wh ...
W > 1 - The Open University
... evidence for an anti-jet. Radio maps reveal huge structure not detected at visual wavelengths. The highly active nature of M87 points to a massive black hole at heart of the galaxy. From M87 move about 1o east to locate NGC4552 (M89) (9.8) eg and then half a degree northeast to locate NGC4569 (M90) ...
... evidence for an anti-jet. Radio maps reveal huge structure not detected at visual wavelengths. The highly active nature of M87 points to a massive black hole at heart of the galaxy. From M87 move about 1o east to locate NGC4552 (M89) (9.8) eg and then half a degree northeast to locate NGC4569 (M90) ...
How Marius Was Right and Galileo Was Wrong Even Though
... Based on this hypothesis, the number of stars N* within a distance L of Earth would be expected to increase as L3. Galileo thought he was seeing the physical bodies of stars with his telescope, and so thought stars' apparent sizes relative to the apparent size of the sun indicated their distances: ...
... Based on this hypothesis, the number of stars N* within a distance L of Earth would be expected to increase as L3. Galileo thought he was seeing the physical bodies of stars with his telescope, and so thought stars' apparent sizes relative to the apparent size of the sun indicated their distances: ...
Inner Outer Planets Quiz
... and an incoming piece of solar system debris. The incoming debris could be an asteroid, a comet, or a meteoroid. Most meteors are caused by very small meteoroids entering the atmosphere. 4. The inner planets are also known as the terrestrial planets because they are solid, rocky planets. The gas gia ...
... and an incoming piece of solar system debris. The incoming debris could be an asteroid, a comet, or a meteoroid. Most meteors are caused by very small meteoroids entering the atmosphere. 4. The inner planets are also known as the terrestrial planets because they are solid, rocky planets. The gas gia ...
1. setting the scene 2. the cosmic dark ages and the first stars
... Our knowledge of the process by which gas turns into stars is still sketchy. One thing we do know is that stars are not all of the same mass – when a cloud of gas cools and condenses to form a cluster of stars, some stars will be as heavy as our Sun, while others will be less massive and yet others ...
... Our knowledge of the process by which gas turns into stars is still sketchy. One thing we do know is that stars are not all of the same mass – when a cloud of gas cools and condenses to form a cluster of stars, some stars will be as heavy as our Sun, while others will be less massive and yet others ...
tremaine_stanford
... timescales longer than 100 Myr – future of solar system over longer times can only be predicted probabilistically • the solar system is a poor example of a deterministic universe • dominant chaotic motion for outer planets is in phase, not shape (eccentricity and inclination) or size (semi-major axi ...
... timescales longer than 100 Myr – future of solar system over longer times can only be predicted probabilistically • the solar system is a poor example of a deterministic universe • dominant chaotic motion for outer planets is in phase, not shape (eccentricity and inclination) or size (semi-major axi ...
Astronomy Lecture 3b
... The average density is less than that of water. A.Saturn B.Uranus C.Pluto D.Neptune E.Jupiter ___ 81. ? is a bluish color. It is sometimes characterized by deep blue spots, like the Great Dark Spot. A.Saturn B.Uranus C.Pluto D.Neptune E.Jupiter ___ 82. Helioseismology is useful for determining the S ...
... The average density is less than that of water. A.Saturn B.Uranus C.Pluto D.Neptune E.Jupiter ___ 81. ? is a bluish color. It is sometimes characterized by deep blue spots, like the Great Dark Spot. A.Saturn B.Uranus C.Pluto D.Neptune E.Jupiter ___ 82. Helioseismology is useful for determining the S ...
The Earth in Context: Universe and Solar System
... our personal lives, our Earth however is merely an infinitesimal speck floating in the vastness of space, the buffer of life between us as individuals and the hostile vacuum of space. ...
... our personal lives, our Earth however is merely an infinitesimal speck floating in the vastness of space, the buffer of life between us as individuals and the hostile vacuum of space. ...
Deducing Temperatures and Luminosities of Stars
... • Measured brightness increases with surface area • If two stars have same T but different luminosities (per unit surface area), then the MORE luminous star must be LARGER. ...
... • Measured brightness increases with surface area • If two stars have same T but different luminosities (per unit surface area), then the MORE luminous star must be LARGER. ...
The Sidereal Messenger - UB
... greater spots on the moon are not seen to reach the edge of the circumference on any side, although it might be expected that some would be found near the edge as well as elsewhere; it seems credible that there are spots there, but that they cannot be seen because they are hidden by a mass of atmosp ...
... greater spots on the moon are not seen to reach the edge of the circumference on any side, although it might be expected that some would be found near the edge as well as elsewhere; it seems credible that there are spots there, but that they cannot be seen because they are hidden by a mass of atmosp ...
Planet migration
... Dead zone: disk region (<12AU) is poorly ionised (Turner et al. 2007) and so growth of ...
... Dead zone: disk region (<12AU) is poorly ionised (Turner et al. 2007) and so growth of ...
Star Constellations
... Ancient Babylonian astronomers created the Zodiac. The Zodiac is a circle that divides the ecliptic into twelve 30-degree zones. Each zone contains a constellation, many of them animals. Horoscopes based on these astrological signs first appeared in Ptolemaic Egypt in around 50 BC. These early peopl ...
... Ancient Babylonian astronomers created the Zodiac. The Zodiac is a circle that divides the ecliptic into twelve 30-degree zones. Each zone contains a constellation, many of them animals. Horoscopes based on these astrological signs first appeared in Ptolemaic Egypt in around 50 BC. These early peopl ...
The Parallax Activity: Measuring the Distances to
... 1. The distance of Earth to the sun (one AU) is very small compared to interstellar distances, so parallax angles are smaller than one arcsecond, which is 1/3600 of a degree. 2. An alternative distance measurement for stars used by most astronomers is the ...
... 1. The distance of Earth to the sun (one AU) is very small compared to interstellar distances, so parallax angles are smaller than one arcsecond, which is 1/3600 of a degree. 2. An alternative distance measurement for stars used by most astronomers is the ...
13_Lecture_Outline
... Suppose you found a star with the same mass as the Sun moving back and forth with a period of 16 months. What could you conclude? A. B. C. D. ...
... Suppose you found a star with the same mass as the Sun moving back and forth with a period of 16 months. What could you conclude? A. B. C. D. ...
intergalactic move
... summer and at night in a place four times colder than Russia in the winter! Brrrr, that’s cold! Mars used to be warmer and wetter billions of years ago. When this was the case it is possible that life on Mars began. Nowadays it is cold and dry, making living there impossible. Perhaps some bacteria s ...
... summer and at night in a place four times colder than Russia in the winter! Brrrr, that’s cold! Mars used to be warmer and wetter billions of years ago. When this was the case it is possible that life on Mars began. Nowadays it is cold and dry, making living there impossible. Perhaps some bacteria s ...
The Stellar Content of Obscured Galactic Giant H II Regions
... Near infrared (1–5 µm) spectroscopic classification schemes have recently been outlined for OB stars (Hanson et al. 1996, hereafter HCR96; Blum et al. 1997) and Wolf–Rayet (WR) stars (e.g., Eenens et al. 1991; Figer et al. 1997). Coupled with infrared spectrometers on large telescopes, these classif ...
... Near infrared (1–5 µm) spectroscopic classification schemes have recently been outlined for OB stars (Hanson et al. 1996, hereafter HCR96; Blum et al. 1997) and Wolf–Rayet (WR) stars (e.g., Eenens et al. 1991; Figer et al. 1997). Coupled with infrared spectrometers on large telescopes, these classif ...
