Astronomy 101 

Pics, News, Information,

Resources, Events, Gear

 

  Exact Time

 

    

 

 
  

 

Custom Search

 

   ASTRONOMY101 GURU Custom Search on Anything! - Try it now!
  Get a job now!  1000s of Jobs!   Click any job:  
 

Mainframes Jobs

z/OS, DB2, CICS, ECM

COBOL, SysProg, ASM,

Proj Mgrs, QA, Support

Software101 Jobs

JAVA, .NET, C++, C#

HTML, PHP, SQL, Linux

Internet, Web dev

 FIRE101 Jobs

Firemen, Volunteer,

EMT, EMS, Emergency,

Firefighters, Chief

 POLICE101 Jobs

Police Officers, Cops

Law Enforcement,

Paralegal, Forensics

 GENETICS101 Jobs

Lab Techs, Interns,

Gene Research, Medical

Genomes, Biotech

 Nursing101 Jobs

Clinical, Emergency, ICU

LPN, RN, Travel, Home

Nurse Practitioners

 

z101 menu learn something new today


 

 

 

 

     Live EBAY Auctions 

         Internet Search Results 

What is a light-year and how is it used?? - NASA
The light-year we have already defined. The parsec is equal to 3.3 light-years. Using the light-year, we can say that : The Crab supernova remnant is about 4,000 light-years away. The Milky Way Galaxy is about 150,000 light-years across. The Andromeda Galaxy is 2.3 million light-years away.

StarChild: The Milky Way - NASA
Our Galaxy is a spiral galaxy that formed approximately 14 billion years ago. Contained in the Milky Way are stars, clouds of dust and gas called nebulae, planets, and asteroids. Stars, dust, and gas fan out from the center of the Galaxy in long spiraling arms. The Milky Way is approximately 100,000 light-years in diameter.

Redshift and Hubble's Law - NASA
The exact value of the Hubble constant is still somewhat uncertain, but is generally believed to be around 65 kilometers per second for every megaparsec in distance. (A megaparsec is given by 1 Mpc = 3 x 10 6 light-years). This means that a galaxy 1 megaparsec away will be moving away from us at a speed of 65 km/sec, while another galaxy 100 ...

Does the Sun move around the Milky Way? - NASA
The Sun (and, of course, the rest of our solar system) is located near the Orion arm, between two major arms (Perseus and Sagittarius). The diameter of the Milky Way is about 100,000 light-years and the Sun is located about 28,000 light-years from the Galactic Center. You can see a drawing of the Milky Way below which shows what our Galaxy ...

Parallax - NASA
From the image above, you can see that by knowing the size of Earth's orbit and measuring the angles of the light from the star at two points in the orbit, the distance to the star can be derived. The farther the star is, the smaller the angles. For stars more than about 100 light-years from Earth, we cannot measure any shift and the method fails.

Just How Big is this Place? - NASA
A light year is equal to 9,500,000,000,000 km and is the distance that light travels in one year. A light year can be expressed as 9.5 trillion km or in scientific notation as 9.5 x 10 12 km. The star outside of our solar system that is closest to Earth is Alpha Centauri C.

How long does it take to fly to Saturn? - NASA
It took these two spacecraft about 3 years and 2 months to reach the ringed planet of Saturn. The nearest star (after our Sun, of course!) is Proxima Centauri at a distance of 4.2 light years . At a speed of 17 km/sec (such as what the Voyager 1 spacecraft currently has), it would take about 75,000 years to reach Proxima Centauri.

StarChild: Glossary - NASA
One parsec equals 3.26 light-years. PAYLOAD BAY The main body of the Space Shuttle where the payload, or cargo, is stored. PHOTOSYNTHESIS The process by which plants use carbon dioxide, nutrients, and sunlight to produce food. PHYSICIST A person who studies physics. PHYSICS The science of matter and energy, and of interactions between the two.

StarChild: The Milky Way - NASA
The Milky Way is over 100,000 light-years wide. It is called a spiral galaxy because it has long arms which spin around like a giant pinwheel. Our Sun is a star in one of the arms. When you look up at the night sky, most of the stars you see are in one of the Milky Way arms.

Can you see other galaxies without a telescope? - NASA
The Andromeda Galaxy is about 2.5 million light-years away and is about 200,000 light-years across. It is thought to contain about 400 billion stars. If you are lucky enough to be able to observe the Andromeda Galaxy through a small telescope or a good pair of binoculars, it is obvious that most of its light comes from a very bright central core.

         

 

 

    * Latest Astronomy in the News * 

 

 

ASTRONOMY101.COM --- Astronomy Pics, News, Information, News, Resources, Space Exploration, Telescopes, Astronomy Supplies. and Lots More
Need to Find information on any subject? ASK THE ASTRONOMY101 GURU! - Images from Wikipedia

 * Contact us:  support@z101.com
 
                                  

Copyright © 2007-2013 ASTRONOMY101.COM