• Que es un sistema de estrellas binarias?
  desart to stars tha turn around acommon senter point
  
  
  
  
  
  
  cluster stars system
  
  these are groups of tens, hundreds or thousansof stars
  
  
  
  
  
  
  diferent types of stars, stars have different characterics:
  color:when we luck at the stars though binocules or evenwith the naked eyes we can see different tound and different stars. Some are bluish, readdish, orange, and so on.
  - the sun is a yellow star.
  
  on the other hand,sirius be of comies majoris a hundred times smaller than the sun
  bear
  
  brightness
  some stars are brigther than others.sirius is very bright other sars are so faint that we cannot see them with the naked eye, they have been discoverd thanks to the use of telescopes
  light
  some stars emmit more light than others, to stars emitting the same amount of ligth will not be as brigth as each other is they are at different distances from the earth.
  HOMEWORK: hacer una presentacion en power poin en ingles,de los planetas del sistema solar donde diga,




• masa




• distancia del sol




• radio




• periodo de rotacion




• periodo de traslacion

Ademas como sta organizado el sistema solar.

galaxi are make up of groups of stars, geses and dust awar galaxi is could the milki way, the nears galaxi to awer own is andromeda whish is more than two million lait years away. this means that when why look a this galaxi whi are seing it as it was more than two millions years ago.dependy or there cheip galaxis can be:

elliptical: is more or less spherical

spiral: a flat thisc whith several arms caming aut of the nucleous of spiral

The Milky Way, sometimes called simply the Galaxy, is the galaxy in which our Solar System is located. It is a barred spiral galaxy that is part of the Local Group of galaxies. It is one of billions of galaxies in the observable universe.

Milky Way Galaxy
Infrared image of the core of the Milky Way galaxy
Observation data
Type
SBbc (barred spiral galaxy)
Diameter
100,000 light years
Thickness
1,000 light years (stars)
Number of stars
200 to 400 billion
Oldest known star
13.2 billion years[1]
Mass
5.8×1011 M☉
Sun's distance to galactic center
26,000 ± 1,400 light-years
Sun's galactic rotation period
220 million years (negative rotation)
Spiral pattern rotation period
50 million years[2]
Bar pattern rotation period
15 to 18 million years[2]
Speed relative to CMB rest frame
552 km/s[3]
See also: Galaxy, List of galaxies
This box: view • talk • edit