Energy Transport
... • Nuclei repel each other (Coulomb barrier) • High enough temperature means a small percentage will have a high enough energy to get close enough for strong interaction to occur (Maxwell distribution of velocities) • Sufficiently high pressure ensures that enough reactions occur to supply energy nee ...
... • Nuclei repel each other (Coulomb barrier) • High enough temperature means a small percentage will have a high enough energy to get close enough for strong interaction to occur (Maxwell distribution of velocities) • Sufficiently high pressure ensures that enough reactions occur to supply energy nee ...
Saraswati River - Ancient Greece
... All ancient astronomy relies on naked-eye observations. What could an ancient see with the naked eye? 1. sun, moon, Mercury, Mars, Venus, Jupiter and Saturn 2. 1000s of stars – of which only about 1000 were identifiable in groups – namely the 48 ancient constellations which were formalised by Ptolem ...
... All ancient astronomy relies on naked-eye observations. What could an ancient see with the naked eye? 1. sun, moon, Mercury, Mars, Venus, Jupiter and Saturn 2. 1000s of stars – of which only about 1000 were identifiable in groups – namely the 48 ancient constellations which were formalised by Ptolem ...
Supernova - Mid-Pacific Institute
... discovered bright supernovae occurring in the Milky Way in 1572 and 1604. no supernova has been seen in our Galaxy since Kepler's. ...
... discovered bright supernovae occurring in the Milky Way in 1572 and 1604. no supernova has been seen in our Galaxy since Kepler's. ...
Can you figure out which of the stars shown here have planets
... Our sun is also a star, and we know of eight planets that orbit it. Can you name them all? You can see most of them in the night sky, but Uranus and Neptune are too faint to be seen -- they weren't discovered until astronomers started using telescopes. Uranus was discovered by accident, and soon ast ...
... Our sun is also a star, and we know of eight planets that orbit it. Can you name them all? You can see most of them in the night sky, but Uranus and Neptune are too faint to be seen -- they weren't discovered until astronomers started using telescopes. Uranus was discovered by accident, and soon ast ...
A105 Stars and Galaxies
... •The planet needs to be the right distance from the star. WHY? •The star needs to have the right mass. WHY? ...
... •The planet needs to be the right distance from the star. WHY? •The star needs to have the right mass. WHY? ...
Reach for the Stars – Div. B
... X-ray “picture” of the Geminga pulsar taken with the XMM-Newton X-ray space observatory. It is an example of the remnants of a large mass star that died in a type II supernova explosion about 300,000 years ago leaving behind a rapidly rotating neutron star. It is 815 light years away (fairly close) ...
... X-ray “picture” of the Geminga pulsar taken with the XMM-Newton X-ray space observatory. It is an example of the remnants of a large mass star that died in a type II supernova explosion about 300,000 years ago leaving behind a rapidly rotating neutron star. It is 815 light years away (fairly close) ...
Stellar Evolution (Formation)
... When the core’s H is exhausted, there will be no more nuclear energy to heat the gas. Gravity will win over gas pressure and the core will collapse. Gravitational potential energy of the core will be converted to heat as it shrinks. This new heat source will trigger new fusion reactions: (3-) ...
... When the core’s H is exhausted, there will be no more nuclear energy to heat the gas. Gravity will win over gas pressure and the core will collapse. Gravitational potential energy of the core will be converted to heat as it shrinks. This new heat source will trigger new fusion reactions: (3-) ...
Stellar Formation 1) Solar Wind/Sunspots 2) Interstellar Medium 3) Protostars
... travel outward from the Sun responsible for comet’s tail and for blowing away primary atmospheres of inner planets pushes interstellar dust out of the Solar System ...
... travel outward from the Sun responsible for comet’s tail and for blowing away primary atmospheres of inner planets pushes interstellar dust out of the Solar System ...
chapter15SurveyStars..
... • The light curve of this pulsating variable star shows that its brightness alternately rises and falls over a ...
... • The light curve of this pulsating variable star shows that its brightness alternately rises and falls over a ...
chapter 2 - Test Bank 1
... This chapter focuses on the appearance of the night sky. Many of the concepts presented were common knowledge before time became quantified on clocks and city lights blocked our nightly view of the sky. Most people today no longer have an understanding of the basic appearance or motions of the sky. ...
... This chapter focuses on the appearance of the night sky. Many of the concepts presented were common knowledge before time became quantified on clocks and city lights blocked our nightly view of the sky. Most people today no longer have an understanding of the basic appearance or motions of the sky. ...
The Celestial E-Sphere
... The first outing for the Celestial E-Sphere was at Astrofest in February 2007. Scores of attendees asked about the program making very admiring comments. Several of followed up since and asked for copies. In all cases where there has been feedback it has been very positive. Some of the lecturers and ...
... The first outing for the Celestial E-Sphere was at Astrofest in February 2007. Scores of attendees asked about the program making very admiring comments. Several of followed up since and asked for copies. In all cases where there has been feedback it has been very positive. Some of the lecturers and ...
Chapter10 (with interactive links)
... fixed distance of 10 parsecs from us. This is useful because it allows us to quickly compare the true luminosity of each object if we imagine that every object is at the same distance from us! M = m – 5log(d) +5 or m-M = 5log(d) -5 M = absolute magnitude M = apparent (observed) magnitude. You will n ...
... fixed distance of 10 parsecs from us. This is useful because it allows us to quickly compare the true luminosity of each object if we imagine that every object is at the same distance from us! M = m – 5log(d) +5 or m-M = 5log(d) -5 M = absolute magnitude M = apparent (observed) magnitude. You will n ...
New light on our Sun`s fate - Space Telescope Science Institute
... but its size is similar to Earth’s. So, the density of white-dwarf matter can be a million times higher than the Sun’s average. Because white dwarf densities are so high, we call these stellar remnants natural condensed-matter laboratories. The pressure at a white dwarf’s surface is extreme because ...
... but its size is similar to Earth’s. So, the density of white-dwarf matter can be a million times higher than the Sun’s average. Because white dwarf densities are so high, we call these stellar remnants natural condensed-matter laboratories. The pressure at a white dwarf’s surface is extreme because ...
Homework #3
... point on its equator goes around once every 26.8 days, but a point at 75 degrees latitude (either north or south) takes 31.8 days to go around. In 10 years, how many more times has the Sun rotated at its equator than at 75 degrees latitude? 5) List the three kinds of gas pressure discussed in class. ...
... point on its equator goes around once every 26.8 days, but a point at 75 degrees latitude (either north or south) takes 31.8 days to go around. In 10 years, how many more times has the Sun rotated at its equator than at 75 degrees latitude? 5) List the three kinds of gas pressure discussed in class. ...
star_temperatures
... • The hotter the star, the more light it gives off at all wavelengths, through each unit area of its surface – luminosity is proportional to T4 so even a small increase in temperature makes a big increase in luminosity ...
... • The hotter the star, the more light it gives off at all wavelengths, through each unit area of its surface – luminosity is proportional to T4 so even a small increase in temperature makes a big increase in luminosity ...
Solutions
... 1. Chapter 13, Question 12: Assume the Sun has been producing energy at a constant rate over its lifetime of 4.5 billion years (1.4 × 101 7 s). (a) How much mass has it lost creating energy over its lifetime? (b) The present mass of the Sun is 2 × 103 0 kg. What fraction of its present mass has been ...
... 1. Chapter 13, Question 12: Assume the Sun has been producing energy at a constant rate over its lifetime of 4.5 billion years (1.4 × 101 7 s). (a) How much mass has it lost creating energy over its lifetime? (b) The present mass of the Sun is 2 × 103 0 kg. What fraction of its present mass has been ...
File - Mr. Catt`s Class
... The Chandrasekhar Limit 1. Even though electron degeneracy supports the white dwarf against collapsing completely, there is a limit to the amount of pressure degenerate electrons can withstand. 2. This limit to the mass of a white dwarf above which it cannot be supported by electron degeneracy and ...
... The Chandrasekhar Limit 1. Even though electron degeneracy supports the white dwarf against collapsing completely, there is a limit to the amount of pressure degenerate electrons can withstand. 2. This limit to the mass of a white dwarf above which it cannot be supported by electron degeneracy and ...
Ursa Minor
Ursa Minor (Latin: ""Smaller She-Bear"", contrasting with Ursa Major), also known as the Little Bear, is a constellation in the northern sky. Like the Great Bear, the tail of the Little Bear may also be seen as the handle of a ladle, hence the name Little Dipper. It was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and remains one of the 88 modern constellations. Ursa Minor has traditionally been important for navigation, particularly by mariners, due to Polaris being the North Star.Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night sky, ranging from apparent magnitude 1.97 to 2.00. Beta Ursae Minoris, also known as Kochab, is an aging star that has swollen and cooled to become an orange giant with an apparent magnitude of 2.08, only slightly fainter than Polaris. Kochab and magnitude 3 Gamma Ursae Minoris have been called the ""guardians of the pole star"". Planets have been detected orbiting four of the stars, including Kochab. The constellation also contains an isolated neutron star—Calvera—and H1504+65, the hottest white dwarf yet discovered with a surface temperature of 200,000 K.