Astrophysics Flashcards

Physics Option D, Astrophysics

Critical Density Density for which the curvature of the universe is zero/at which it will expand forever but will reach zero/at which the universe will begin to contract after an infinite amount of time. Stellar cluster Stars that are gravitationally bound forming an arrangement in space. Constellation A collection of stars that form a recognisable […]

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Astrophysics PART 4

Newton’s Model of the Universe The universe is infinite in both space and time. It is uniform and static. Meaning there are an infinite number of stars heading out in all directions to infinity (otherwise the universe would collapse under its own gravitational force) Obler’s Paradox Question Why is the night sky dark? or Why […]

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Physics – Topic D: Astrophysics – D.1 Stellar Quantities

Comets Comets are irregular objects a few kilometres across comprising of frozen gases, rock and dust. Stars (Single & Binary) All stars initially form when gravity causes gas in a nebula to condense. As the atoms move towards one another, they lose gravitational potential energy that is converted into kinetic energy. This raises the temperature […]

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IB Physics Topic Option E Astrophysics

Define a planet. •Celestial body that orbits around the sun •has sufficient mass for its self gravity •has cleared the neighborhood around its orbit Define astroids. Between orbits of Mars and Jupiter, smaller orbiting bodies Define comets. •small orbiting body •loose particles of ice and rock that are blown off by the solar wind forming […]

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Physics – Option E – Astrophysics

Absolute magnitude The apparent magnitude a star would have if observed from a distance of 10 pc. Apparent brightness The received energy per second per unit area of detector. It equals b = L/4(pi)d^2. Its units are Wm^-2. Apparent magnitude A measure of brightness of a star as seen form earth in a relative system […]

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Glossary (Nuclear, Thermal and Astrophysics) AQA Physics A Unit 5A

Absolute magnitude (M) The apparent magnitude a star would have if it were placed at a standard distance of 10 pc from Earth. m – M = 5 log(d/10) where d is the distance in parsecs. Activity (A) The number of emissions per second, measured in Becquerels. Airy disc The bright central region in an […]

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AST 101 Exam 2 Laws of Astrophysics

Keplers 1st Law (Orbital Motion) Planets travel in elliptical orbits with the sun as a focus Keplers 2nd Law (Orbital Motion) The line going from the Sun to the planet sweeps out equal areas in equal times *Explains relationship between planets around the sun Keplers 3rd Law (Orbital Motion) The time that a planet takes […]

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Astrophysics Questions And Answers

Outline the likely evolution of the star Khad after it leaves the main sequence Since it has a mass greater than 1.3 Ms, it will go through a super red giant, onto a supernova to a neutron star or black hole. Red supergiant star: • Large luminosity • Red color • Relatively low surface temperature […]

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Astrophysics Definitions

What is the universe? a large collection of billions of galaxies What is a galaxy? A large cluster of stars What is a solar system? a star with orbiting planets What is a planet? A large sphere of matter that orbits the sun What is an exoplanet? A planet orbiting around a star other than […]

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Astrophysics IB PHYSICS HL

Solar system Mercury, venus, earth, mars, jupiter, saturn, uranus and neptune. Stellar clusters Groupings of a large number of stars bound by gravity. 1. Globular clusters: large number of mainly old stars. 2. Open clusters: small number of young stars that are farther apart. Galaxy A huge assembly of stars bound together by gravity. Cluster […]

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Astrophysics for People in a Hurry

Einstein’s General Theory of Relativity The presence of matter and energy curves the fabric of space and time around it. Molecules A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction. Atoms A unit of matter; the smallest unit of a chemical […]

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Astrophysics Test

Sun 99% of the mass of the solar system made mostly of H/He gas (plasma) converts 4 million tons Mercury Made out of metal and rock, large iron core cratered, desolate, long, tall, steep cliffs Venus Earth’s twin because size surface hidden by clouds 1 day Venus 243 days earth hellish conditions due to an […]

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Astrophysics Questions

When did Pluto become a dwarf planet? August 2006 How many planets are in our solar system? 8 planets What is our solar system called The Milky Way How long does it take to get to the sun 19 years Who was the first person to land on the moon Neil Armstrong

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Astrophysics Study Guide Flashcard

chapter 12 … what dust is emitted into to create galaxies interstellar medium giant molecular clouds which are cool and dense collapse into cluster of stars if temp reaches 10,000,000K what happens nuclear fusion into a protostar high mass stars have higher luminosity than low mass stars (t or f) true chapter 13 read full […]

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Astrophysics concepts study guide

Outline general structure of solar system Order of planets: (including order in mass and radius; smallest to largest.) Mercury; 1, 1 Venus; 3, 3 Earth;4, 4 Mars; 2, 2 Jupiter; 8,8 Saturn; 7,7 Uranus; 5, 6 Neptune; 6, Distinguish between stellar cluster and a constellation CONSTELLATIONS: Stars that look like they are close together but […]

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Astrophysics Test Questions

Definition of a universe Collection of billions of galaxies Definition of galaxy Large collection of stars Planets Eight planets in our solar system that orbit a star, the sun. Mercury, venus, earth, mars, Jupiter, Saturn, Uranus, Neptune Moons Orbit planets with circular orbits, they’re natural satellites Artificial satellites Ones humans have built, usually orbit earth […]

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Final: Astrophysics

RED GIANTS & WHITE DWARFS Parsec a unit of distance used in astronomy, equal to about 3.26 light years 3.086 × 1013 kilometers Star’s proper motion A proper motion of 1 arcsec per year at a distance of 1 light-year corresponds to a relative transverse speed of 1.45 km/s Apparent Brightness The Apparent Magnitude (M) […]

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IB Physics standard level option E Astrophysics

Luminosity how bright a star will be in relation to the sun if all star were the same distance from the observer Light Year the distance light travels in one year Ellipse A elongated circle, or oval shape, the shape of the planets orbit. Astronomical Unit The average distance between Earth and the sun, about […]

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Astrophysics final

milky way galaxy – one out of billions/trillions – named by the greeks; galaxies kuklos, milky circle – Romans; via lactea= milky way – andromeda (closest galaxy to us) 2.3 million LY away – 400 billion solar masses galileo – 1st resolved milky way into stars – telescope william and caroline herschel – 1st to […]

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Astrophysics Flashcard

The Universe A large collection of billions of galaxies Galaxy Large collection of billions of stars Our sun A star in the milky way galaxy Planets Orbit a star dwarf planet Small planets Moons orbit planets artificial satellite Orbit earth, built by humans Asteroids Lumps of rock and metal, found in asteroid belt, orbit sun […]

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Astrophysics Part 2

Kepler’s Third Law Square of the period of any planet is proportional to the cube of the semi major axis of its orbit Stellar Parallax Created by orbital position. Max shift is when the earth is at opposite sides of the sun. Once angle found, distance is calculated via trigonometry. Photosphere Coolest part of the […]

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