Stellar evolution
... • Not even light can overcome gravitational pull. • Dark sphere where gravity overcomes light is called “event ...
... • Not even light can overcome gravitational pull. • Dark sphere where gravity overcomes light is called “event ...
Equivalent Widths and Chemical abundances Equivalent
... 1) Hydrogen is the base line element for analyses in the Sun. Its abundance comes from the continuum opacity though the H-minus ion. 2) Helium is very hard to measure in the Sun (no absorption lines are present). It can be inferred from solar wind particles and from measurements in solar chromospher ...
... 1) Hydrogen is the base line element for analyses in the Sun. Its abundance comes from the continuum opacity though the H-minus ion. 2) Helium is very hard to measure in the Sun (no absorption lines are present). It can be inferred from solar wind particles and from measurements in solar chromospher ...
document
... Thanks to the water-ice and rocky material, Jupiter grew fast. When Jupiter’s core reached 10-15 M, its gravitational influence is strong enough to form its own accretion disk. ...
... Thanks to the water-ice and rocky material, Jupiter grew fast. When Jupiter’s core reached 10-15 M, its gravitational influence is strong enough to form its own accretion disk. ...
Document
... • Learn some astronomy. The details are not so important, the fact that we have been able to learn so much about the Universe is a more important point. ...
... • Learn some astronomy. The details are not so important, the fact that we have been able to learn so much about the Universe is a more important point. ...
Our Universe
... “As Earth moves in its orbit around the sun, it changes position with respect to the stars; consequently, over time, people on Earth view the stars from slightly different positions. Astronomers calculate how these tiny variations in position correspond to the distance to a star.” ...
... “As Earth moves in its orbit around the sun, it changes position with respect to the stars; consequently, over time, people on Earth view the stars from slightly different positions. Astronomers calculate how these tiny variations in position correspond to the distance to a star.” ...
Stellar Evolution
... Carbon-Oxygen (C,O) core does not ignite Carbon fusion. He-burning shell keeps dumping C and O onto the core. C,O core collapses until gravity is balanced by pressure from a new state of matter: ...
... Carbon-Oxygen (C,O) core does not ignite Carbon fusion. He-burning shell keeps dumping C and O onto the core. C,O core collapses until gravity is balanced by pressure from a new state of matter: ...
ReviewQuestionsForClass
... Formation of Protostars (from lecture) Stellar dynamics - stability of a star (33-2) Creation of elements in a star (33-2) Helium in a main sequence star (33-2) Basic outline of stellar evolution (33-2) ...
... Formation of Protostars (from lecture) Stellar dynamics - stability of a star (33-2) Creation of elements in a star (33-2) Helium in a main sequence star (33-2) Basic outline of stellar evolution (33-2) ...
01 - Awtrey Middle School
... 2. During which stage of the life cycle is a star a ball of gas and dust? a. first stage b. second stage c. third stage d. last stage 3. What gas does hydrogen change into as a star becomes hotter? a. uranium b. helium c. gravity d. carbon DIFFERENT TYPES OF STARS 4. Which of the following is NOT a ...
... 2. During which stage of the life cycle is a star a ball of gas and dust? a. first stage b. second stage c. third stage d. last stage 3. What gas does hydrogen change into as a star becomes hotter? a. uranium b. helium c. gravity d. carbon DIFFERENT TYPES OF STARS 4. Which of the following is NOT a ...
HNRS 227 Lecture #2 Chapters 2 and 3
... moving more rapidly than average will escape, or leave the cluster A stellar association is a group of newborn stars that are moving apart so rapidly that their gravitational attraction for one another cannot pull them into orbit about one another ...
... moving more rapidly than average will escape, or leave the cluster A stellar association is a group of newborn stars that are moving apart so rapidly that their gravitational attraction for one another cannot pull them into orbit about one another ...
Time Domain Astrophysics in South Africa 2
... YUV420 codec decompressor are needed to see this picture. ...
... YUV420 codec decompressor are needed to see this picture. ...
Life on the Main Sequence + Expansion to Red Giant
... Guidepost Stars form from the interstellar medium and reach stability fusing hydrogen in their cores. This chapter is about the long, stable middle age of stars on the main sequence and their old age as they swell to become giant stars. Here you will answer four essential questions: • Why is there ...
... Guidepost Stars form from the interstellar medium and reach stability fusing hydrogen in their cores. This chapter is about the long, stable middle age of stars on the main sequence and their old age as they swell to become giant stars. Here you will answer four essential questions: • Why is there ...
(a) Because the core of heavy-mass star never reaches high enough
... 15. Which one of the following is the right set of descriptions for the “Solar Thermostat”? (a) When core temperature increases, pressure increases. Higher pressure expands the system which then cools the core. (b) When core temperature decreases, pressure increases. Higher pressure expands the sys ...
... 15. Which one of the following is the right set of descriptions for the “Solar Thermostat”? (a) When core temperature increases, pressure increases. Higher pressure expands the system which then cools the core. (b) When core temperature decreases, pressure increases. Higher pressure expands the sys ...
An Assessment: Think Pair Share
... How does the size of a star near the top left of the H-R diagram compare with a star of the same luminosity near the top right of the H-R diagram? ...
... How does the size of a star near the top left of the H-R diagram compare with a star of the same luminosity near the top right of the H-R diagram? ...
PowerPoint Presentation - Research in observational
... collapse if the time sound takes to reach the centre from the surface is longer than the free-fall time. This condition defines the Jeans length, the maximum radius that a cloud can have before it collapses to form a star. ...
... collapse if the time sound takes to reach the centre from the surface is longer than the free-fall time. This condition defines the Jeans length, the maximum radius that a cloud can have before it collapses to form a star. ...
Stars and Galaxies
... Our sun is a star. There are countless more like it in space. The sun is one of billions of stars that make up the Milky Way. The Milky Way is a Galaxy. A galaxy is a cluster of stars held together by the force of gravity. The stars in a galaxy are very far apart. Scientists believe there may be as ...
... Our sun is a star. There are countless more like it in space. The sun is one of billions of stars that make up the Milky Way. The Milky Way is a Galaxy. A galaxy is a cluster of stars held together by the force of gravity. The stars in a galaxy are very far apart. Scientists believe there may be as ...
Oceanography Chapter 1 – “Origins”
... temperature. • Over 14 billion years, gravity magnified these small differences into clusters of galaxies today. ...
... temperature. • Over 14 billion years, gravity magnified these small differences into clusters of galaxies today. ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.