models
... OBSERVABLE PARALLAX COULD MEAN ONE OF TWO THINGS: 1. Stars are so far away that stellar parallax is too small to notice with the naked eye. 2. Earth does not orbit the Sun; it is the center of the universe. With rare exceptions such as Aristarchus, the Greeks rejected the correct explanation (1) bec ...
... OBSERVABLE PARALLAX COULD MEAN ONE OF TWO THINGS: 1. Stars are so far away that stellar parallax is too small to notice with the naked eye. 2. Earth does not orbit the Sun; it is the center of the universe. With rare exceptions such as Aristarchus, the Greeks rejected the correct explanation (1) bec ...
Module P1 - The Earth in the universe
... [Possible alternative approach is looking at the historical development of the understanding of the solar system.] ...
... [Possible alternative approach is looking at the historical development of the understanding of the solar system.] ...
the curious incident of the dog in the night-time
... Astronomical compact objects that include black holes, neutron stars, and white dwarfs, are thought to result from the explosive death of normal stars (supernovae). What controls which compact object forms is the original mass of the progenitor star. Black holes originate from the collapse of the mo ...
... Astronomical compact objects that include black holes, neutron stars, and white dwarfs, are thought to result from the explosive death of normal stars (supernovae). What controls which compact object forms is the original mass of the progenitor star. Black holes originate from the collapse of the mo ...
Stellar Characteristics and Evolution
... Flash. The spectral type and luminosity is not constant however, and some stars can evolve though a large spread of spectral types while in the Horizontal Branch. Eventually, the Helium in the core is exhausted and converted to carbon. The core becomes degenerate and collapses, and the star expands ...
... Flash. The spectral type and luminosity is not constant however, and some stars can evolve though a large spread of spectral types while in the Horizontal Branch. Eventually, the Helium in the core is exhausted and converted to carbon. The core becomes degenerate and collapses, and the star expands ...
society journal - Auckland Astronomical Society
... ovember's Film Night featured a documentary showing how extreme solar activity could disrupt power supplies and threaten our electricity dependent civilisation. It explained how a solar flare sends charged particles and radiation out into space. The Earth’s atmosphere and magnetic fields are usually ...
... ovember's Film Night featured a documentary showing how extreme solar activity could disrupt power supplies and threaten our electricity dependent civilisation. It explained how a solar flare sends charged particles and radiation out into space. The Earth’s atmosphere and magnetic fields are usually ...
Chapter 13 (Properties of Stars)
... 2. Explain why that the vast majority of naked eye stars lie to the upper left of the Sun on the H-R diagram, yet the majority of nearby stars are found to the lower right of our star. Relate this to the limitations of human vision. 3. Sirius and its companion are almost the same temperature, yet Si ...
... 2. Explain why that the vast majority of naked eye stars lie to the upper left of the Sun on the H-R diagram, yet the majority of nearby stars are found to the lower right of our star. Relate this to the limitations of human vision. 3. Sirius and its companion are almost the same temperature, yet Si ...
How a small scientific spark grew during the Renaissance
... considered to be a passive process of merely having faith in the alleged wisdom of others. From Ptolemaeus life we don’t know much. But he was more common as Ptolomy. However, he is known for three scholar works, they all have to do with Geography, Astronomy and Geometry. Ptolomy made the first step ...
... considered to be a passive process of merely having faith in the alleged wisdom of others. From Ptolemaeus life we don’t know much. But he was more common as Ptolomy. However, he is known for three scholar works, they all have to do with Geography, Astronomy and Geometry. Ptolomy made the first step ...
Star in a Box - Las Cumbres Observatory Global Telescope
... The luminosity of a star is powered by nuclear fusion taking place in the centre of the star converting hydrogen into helium. – The temperature and density must be high enough to allow nuclear fusion to occur. – Stars are primarily composed of hydrogen, with small amounts of helium. ...
... The luminosity of a star is powered by nuclear fusion taking place in the centre of the star converting hydrogen into helium. – The temperature and density must be high enough to allow nuclear fusion to occur. – Stars are primarily composed of hydrogen, with small amounts of helium. ...
Powerpoint
... The luminosity of a star is powered by nuclear fusion taking place in the centre of the star converting hydrogen into helium. – The temperature and density must be high enough to allow nuclear fusion to occur. – Stars are primarily composed of hydrogen, with small amounts of helium. ...
... The luminosity of a star is powered by nuclear fusion taking place in the centre of the star converting hydrogen into helium. – The temperature and density must be high enough to allow nuclear fusion to occur. – Stars are primarily composed of hydrogen, with small amounts of helium. ...
Million years - The Origin Of Life
... within the given timescale. The fact that Mercury, Venus and Earth are not 100% locked shows the age of the Solar System to be much less than 4.5 billion years. In the case of the Earth it points to a very recent creation. ...
... within the given timescale. The fact that Mercury, Venus and Earth are not 100% locked shows the age of the Solar System to be much less than 4.5 billion years. In the case of the Earth it points to a very recent creation. ...
L157 EXTRASOLAR GIANT PLANETS UNDER STRONG STELLAR
... Recent work on spectral modeling, colors, interior modeling, and evolution of EGPs and brown dwarfs (BDs) (e.g., Burrows et al. 1997; Allard, Alexander, & Hauschildt 1998) has been extremely successful. So far there have been only limited attempts at stellar irradiation modeling. Due to the intense ...
... Recent work on spectral modeling, colors, interior modeling, and evolution of EGPs and brown dwarfs (BDs) (e.g., Burrows et al. 1997; Allard, Alexander, & Hauschildt 1998) has been extremely successful. So far there have been only limited attempts at stellar irradiation modeling. Due to the intense ...
Spectroscopy – the study of the colors of light (the spectrum) given
... because these electrons are too tightly held in their orbitals. Calcium and Titanium lines are common because they easily lose their electrons. ...
... because these electrons are too tightly held in their orbitals. Calcium and Titanium lines are common because they easily lose their electrons. ...
28 The solar system object in the photograph below is 56 kilometers
... Which motion is responsible for this changing appearance of the Moon? (1) The Moon moves into the shadow of Earth. (2) The Moon moves into the shadow of the Sun. (3) The Sun moves into the shadow of Earth. (4) The Sun moves into the shadow of the Moon. 34 The diagram below shows cutaway views of the ...
... Which motion is responsible for this changing appearance of the Moon? (1) The Moon moves into the shadow of Earth. (2) The Moon moves into the shadow of the Sun. (3) The Sun moves into the shadow of Earth. (4) The Sun moves into the shadow of the Moon. 34 The diagram below shows cutaway views of the ...
Winter 2014
... Pleiades star cluster is close enough that we can see the brightest several stars by eye. Returning to Orion, we can follow the Belt down and to the left and find ourselves at the brightest star in Earth’s night sky, Sirius. Sirius is one of the closest stars to the Earth, which is why it appears so ...
... Pleiades star cluster is close enough that we can see the brightest several stars by eye. Returning to Orion, we can follow the Belt down and to the left and find ourselves at the brightest star in Earth’s night sky, Sirius. Sirius is one of the closest stars to the Earth, which is why it appears so ...
ph507lecnote06
... This energy can provide the fuel which allows the endothermic fusion reactions to create very high mass elements such as Uranium. The ...
... This energy can provide the fuel which allows the endothermic fusion reactions to create very high mass elements such as Uranium. The ...
AS 300 Chpt 3 Ls 3 The Outer Planets
... atmosphere to be about 90 percent hydrogen and 10 percent helium, with small amounts of methane, ammonia, and water vapor. Scientists believe the original solar nebula had a similar makeup. Galileo also found small amounts of certain heavier elements—carbon, nitrogen, and sulfur. These were present ...
... atmosphere to be about 90 percent hydrogen and 10 percent helium, with small amounts of methane, ammonia, and water vapor. Scientists believe the original solar nebula had a similar makeup. Galileo also found small amounts of certain heavier elements—carbon, nitrogen, and sulfur. These were present ...
V Example: our SUN (G2V)
... star apart, usually leaving behind a neutron star. Supernovae can also be produced when enough material is deposited on a white dwarf so that is exceeds the Chandrasekhar limit and collapses to a neutron star. Both types of supernova drastically alter the stars and are the result of the collapse ste ...
... star apart, usually leaving behind a neutron star. Supernovae can also be produced when enough material is deposited on a white dwarf so that is exceeds the Chandrasekhar limit and collapses to a neutron star. Both types of supernova drastically alter the stars and are the result of the collapse ste ...
Could there be life on exoplanets? No room for complacency
... of these so-called exoplanets may carry living materials and, especially, technologically capable life. Can any indications be inferred from the present knowledge of these systems? Living materials as we know them require liquid water and a constant, moderate source of heat. For the Sun, this restri ...
... of these so-called exoplanets may carry living materials and, especially, technologically capable life. Can any indications be inferred from the present knowledge of these systems? Living materials as we know them require liquid water and a constant, moderate source of heat. For the Sun, this restri ...
Pre-Final Quiz Answers
... We can see back in time (and far away) with optical, infrared and radio telescopes to the time, following the "Big Bang" when the Universe first became transparent to light (electromagnetic radiation). We can't see farther or earlier! The Universe at that time is "seen" as the CMB (Cosmic Microwave ...
... We can see back in time (and far away) with optical, infrared and radio telescopes to the time, following the "Big Bang" when the Universe first became transparent to light (electromagnetic radiation). We can't see farther or earlier! The Universe at that time is "seen" as the CMB (Cosmic Microwave ...
Chapter 13
... Low luminosity; high temperature => White dwarfs are found in the lower left corner of the Hertzsprung-Russell diagram. ...
... Low luminosity; high temperature => White dwarfs are found in the lower left corner of the Hertzsprung-Russell diagram. ...
Option E Sum Pages
... Information from the spectra and spectral classes Light is produced in nuclear fission reactions deep in the core of a star and is absorbed and re-emitted many times on its way out to the surface, and therefore has a rather continuous distribution of wavelengths. Chemical elements, ions and molecule ...
... Information from the spectra and spectral classes Light is produced in nuclear fission reactions deep in the core of a star and is absorbed and re-emitted many times on its way out to the surface, and therefore has a rather continuous distribution of wavelengths. Chemical elements, ions and molecule ...
Relative Speed of the Planets: UAC 2008
... "If the Moon be with Saturn or Mars, without the assistance of some good aspect from Jupiter and Venus; and if Saturn be slow in motion, or is going Retrograde, it’s so much the worse, and it’s one argument the sick will dye at that time; if other testimonies concurre, it’s more certaine." ...
... "If the Moon be with Saturn or Mars, without the assistance of some good aspect from Jupiter and Venus; and if Saturn be slow in motion, or is going Retrograde, it’s so much the worse, and it’s one argument the sick will dye at that time; if other testimonies concurre, it’s more certaine." ...
On the hunt for a mystery planet
... operators. That approach saves researchers from making the 2-hourlong journey to the summit of Mauna Kea at 4,200 metres, where the atmosphere has 40% less oxygen and causes many people to experience dizziness, headaches or sometimes more-serious medical problems. But Sheppard likes to be actively i ...
... operators. That approach saves researchers from making the 2-hourlong journey to the summit of Mauna Kea at 4,200 metres, where the atmosphere has 40% less oxygen and causes many people to experience dizziness, headaches or sometimes more-serious medical problems. But Sheppard likes to be actively i ...
The Rocket Science of Launching Stellar Disks
... emission intensity is split into peaks to blue and red of line-center. • This is from Doppler shift of gas moving toward and away from the observer . ...
... emission intensity is split into peaks to blue and red of line-center. • This is from Doppler shift of gas moving toward and away from the observer . ...
Planetary habitability
Planetary habitability is the measure of a planet's or a natural satellite's potential to develop and sustain life. Life may develop directly on a planet or satellite or be transferred to it from another body, a theoretical process known as panspermia. As the existence of life beyond Earth is unknown, planetary habitability is largely an extrapolation of conditions on Earth and the characteristics of the Sun and Solar System which appear favourable to life's flourishing—in particular those factors that have sustained complex, multicellular organisms and not just simpler, unicellular creatures. Research and theory in this regard is a component of planetary science and the emerging discipline of astrobiology.An absolute requirement for life is an energy source, and the notion of planetary habitability implies that many other geophysical, geochemical, and astrophysical criteria must be met before an astronomical body can support life. In its astrobiology roadmap, NASA has defined the principal habitability criteria as ""extended regions of liquid water, conditions favourable for the assembly of complex organic molecules, and energy sources to sustain metabolism.""In determining the habitability potential of a body, studies focus on its bulk composition, orbital properties, atmosphere, and potential chemical interactions. Stellar characteristics of importance include mass and luminosity, stable variability, and high metallicity. Rocky, terrestrial-type planets and moons with the potential for Earth-like chemistry are a primary focus of astrobiological research, although more speculative habitability theories occasionally examine alternative biochemistries and other types of astronomical bodies.The idea that planets beyond Earth might host life is an ancient one, though historically it was framed by philosophy as much as physical science. The late 20th century saw two breakthroughs in the field. The observation and robotic spacecraft exploration of other planets and moons within the Solar System has provided critical information on defining habitability criteria and allowed for substantial geophysical comparisons between the Earth and other bodies. The discovery of extrasolar planets, beginning in the early 1990s and accelerating thereafter, has provided further information for the study of possible extraterrestrial life. These findings confirm that the Sun is not unique among stars in hosting planets and expands the habitability research horizon beyond the Solar System.The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the Universe was only 10–17 million years old. According to the panspermia hypothesis, microscopic life—distributed by meteoroids, asteroids and other small Solar System bodies—may exist throughout the universe. Nonetheless, Earth is the only place in the universe known to harbor life. Estimates of habitable zones around other stars, along with the discovery of hundreds of extrasolar planets and new insights into the extreme habitats here on Earth, suggest that there may be many more habitable places in the universe than considered possible until very recently. On 4 November 2013, astronomers reported, based on Kepler space mission data, that there could be as many as 40 billion Earth-sized planets orbiting in the habitable zones of Sun-like stars and red dwarfs within the Milky Way. 11 billion of these estimated planets may be orbiting Sun-like stars. The nearest such planet may be 12 light-years away, according to the scientists.