MenuRRCS MOBILE
Home
VARIOUS NOTES: ASTRONOMY...TELESCOPES, GALAXIES, and PARALLAX

Chapter 3

Section 1

·      patterns of stars in the sky are constellations

·      visible light is light you can see with your eyes.

·      Light is a form of electromagnetic radiation

·      Electromagnetic radiation is energy that can travel directly through space in the form of waves

·      Wavelength: distance between the crest of one wave and the crest of the next wave.

·      Spectrum: when light spreads out to make a range of different colors with different wave lengths

·      Electromagnetic spectrum includes radio waves, infrared radiation, visible light, ultraviolet radiation, x-rays, and gamma rays.

·      Most telescope collect different types of electromagnetic radiation, including visible light

·      A building that contains one of more telescopes is called an observatory,

·      A spectrograph breaks the light from an object into colors and photographs the resulting spectrum

Astronomers use spectrographs to get info about stars, including their chemical compositions and temperatures. 
Section 2 
·      A giant flat surface containing billions of stars is a galaxy

·      The universe is defined as all of space and everything in it

·      A Light-year is the distance light travels in one year

·      Astronomers often use parallax to measure distances to nearby stars

·      Parallax is the apparent change in position of an object when you look at it from different places

·      Main characteristics used to classify stars are size, temperature, and brightness

·      A star’s apparent magnitude is its brightness seen form earth

·      The star’s absolute magnitude is the brightness the star would have if it were at its standard distance from Earth

Section 3
·      pulsars are short or pulsating radio sources.

A nebula is a large amount of gas and dust spread out in immense volume 
 How long a star lives depends on how much mass is has 
When a star runs out of fuel, it becomes a white dwarf, a neutron star, or a black hole. 
Quasars are bright objects that look almost like stars 
Section 4

·      Star systems with two stars are called double stars or binary stars

·      A system in which one star blocks the light from another is called an eclipsing binary

·      Astronomers have classified most galaxies into three main categories: spiral galaxies, elliptical galaxies, and irregular galaxies

·      A spiral galaxy has the shape of two twin spirals

·      Elliptical galaxies look like flattened spheres

·      Irregular galaxies do not have a regular shape

 
Section 5
·      according to the big bang theory, the universe formed in an enormous explosion about 10 – 15 billion years ago

·      about 5 billion years ago, a cloud of gas and dust collapsed to form the solar system

 
 
KEY TERMS:

CONSTELLATIONS
 
ELECTROMAGNETIC SPECTRUM
 
PULSAR
 
PROTOSTAR
 
HERTZSPRUNG RUSSELL DIAGRAM
 
LIFE STAGES OF A STARS
 
WHEN YOU CAN/CAN'T USE PARALLAX
 
WHAT 'PARALLAX' IS
 
WHAT A 'LIGHT YEAR' IS
 
WAVELENGTH
 
NEUTRON STAR
 
WHITE DWARF
 
BLACK HOLE
 
ECLIPSING BINARY
 
RADIO TELESCOPE
 
REFRACTING TELESCOPE
 
REFLECTING TELESCOPE
 
NEBULA
 
FUSION
 
QUASAR
 
BINARY STAR
 
APPARENT MAGNITUDE
 
ABSOLUTE MAGNITUDE
 
THE HOTTEST STARS ARE 'BLUE WHITE' IN COLOR