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…

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…

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…

Astrophysics

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 Read more…

Astrophysics Study Guide

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 in the evolution of a very massive star. Brown Dwarf Gas and dust that did Read more…

Astrophysics Year 9

Planets orbit the sun The sun is the centre of the solar system The solar system is in the Milky Way Galaxy The Milky Way Galaxy is part of the Universe The Moon has a circular orbit A comet has a more elliptical orbit The velocity of a comet increases Read more…

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 Read more…