Astrophysics Basic Terms

singularity point of infinite mass and infinite density in an infinitely small space, usually in a black hole light year 9.46073047 x 10^15 meters planet An astronomical object orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to Read more…

IB Physics Option D Astrophysics

Asteroid Small rocky body that drifts around the solar system Meteoroid Asteroid on a collision course with another planet Comets Mixtures of rocks and ice in very elliptical orbits around the Sun Nebula Cloud of gas and dust where stars begin to form Binary stars Two or more stars orbiting Read more…

Chapter 5 AstroPhysics

Refracting telescopes are so called for which of the following reasons? The light is bent to a focus. Which of the following is the first thing light hits when it enters a telescope? the primary lens or mirror In a telescope, which of the following is the optical element with Read more…

Astrophysics Quiz 2

How do you calculate Magnitude? focal length of scope/focal length of eye piece List the electro-magnetic spectrum from longest to short radio, microwaves, infrared, visible, ultraviolet, xray, gamma What are the four colors stars can be and what is their order? red, yellow, white, blue What is the wavelength of Read more…

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 Read more…

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 Read more…

Option D: Astrophysics

Binary star Two stars orbiting a common centre Black dwarf The remnant of a white dwarf after it has cooled down. It has very low luminosity. Black hole A singularity in space time; the end result of the evolution of a very massive star Brown dwarf Gas and dust that Read more…

ASTROPHYSICS

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 Read more…

AQA Physics Astrophysics

Convex lens A lens that causes light to be focused towards a point, an image formed is real, inverted Concave lens A lens that causes light to spread out, an image formed is vertual and diminished Focal point The point at which several light rays converge Magnifying power The ratio Read more…

astrophysics study guide

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) Read more…

astrophysics test 3

Milky way diameter 100,000 LY how many stars in milky way 100-400 billlion stars different naming of milky way greeks galaxies kuklos (milky circle) then romans named: via lactea (milky way) distances by cepheid variable stars henrietta leavitt 1912 vary in luminosity/time determining size by open star clusters and globular Read more…

Astrophysics

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 Read more…