Astronomy Magazine

Hubble's Law

Posted on the 18 May 2011 by Gabe12logan
If we look deep into space we will notice that the distant galaxies are moving away from us. In fact, the distance between large groups gradually increased and therefore the universe is constantly growing. This fact, which is in 1929th found by American astronomer Edwin Hubble, is one of the greatest discoveries of modern astronomy. Hubble discovered that the apparent speed of the galaxy depends on its distance, if the galaxy is further, it moves faster away from us (has a higher redshift). This relationship is called Hubble's law.
How are galaxies except for the expansion of the universe moves due to mutual gravitational attraction, Hubble's law applies primarily to distant galaxies, whose speeds are due to expansion of the universe much larger than the speeds because of mutual attraction.
Hubble's law is usually written as:
v = H0D
where v is the speed of the removal observed (extragalactic) object, D its distance and H0 Hubble constant. To determine the value of the Hubble constant we need for a large number of galaxies to determine their removal speeds and distance. Speed of removal is relatively simple to determine from the Doppler effect in a range of sources, while finding the distance is significantly more complex problem. Therefore, the reliability in determining the Hubble constant is directly dependent on the accuracy of methods used to measure distances of galaxies.
Hubble's discovery was so unexpected that it is not immediately grasped its full significance. To easier demonstrate the Hubble's law, consider a balloon and draw on it a few dots. Slowly inflates it. As the balloon expands, so does the distance between each pair of dots increases. Imagine that you are one of these dots and look to other dots. From this point of observation you would seem that all the dots moving away from you. It does not matter which point you choose, each has the same view. Therefore, galaxies in the universe that spreads are like dots on the inflated balloon.

You Might Also Like :

Back to Featured Articles on Logo Paperblog

These articles might interest you :

  • Ralph's Top 10 Blogged Band Chart - as Played on Radio KC - 28.5.17

    Ralph's Blogged Band Chart Played Radio 28.5.17

    Click here for the Ralph's Life websiteTracks from the Top Ten Blogged Bands are played every Sunday 5-7pm on Radio KC as part of Ralph's Indie Show.LISTEN TO... Read more

    The 27 May 2017 by   Mike Lindley
  • Top 3 Ways to Improve Your Health

    Ways Improve Your Health

    I recently listened to an American comedian, who in a sketch was advising a man whose girlfriend had just left him to let her go. "She's not worth it" she told... Read more

    The 27 May 2017 by   Dietdoctor
  • Maria’s Pancakes

    Maria’s Pancakes

    Meal plansGet lots of weekly low-carb meal plans, complete with shopping lists and everything, with our premium meal planner tool (free trial).... Read more

    The 27 May 2017 by   Dietdoctor
  • Cavendish Beach Music Festival 2017 Preview: Zac Brown Band Top 10

    Cavendish Beach Music Festival 2017 Preview: Brown Band

    If you love country music, and you love festivals, and you love to party... then Sunday night at the Cavendish Beach Music Festival is def. going to be your... Read more

    The 27 May 2017 by   Phjoshua
  • My Envy Box May 2017 Unboxing

    Envy 2017 Unboxing

    Hello everyone, what’s up? How are you surviving this heat? I fell sick so many times while I was out in the daytime. Please drink lots of fluid and stay... Read more

    The 27 May 2017 by   Jhilmil D Saha
  • Holiday Beauty Prep • Made Easy

    Holiday Beauty Prep Made Easy

    We are fast approaching the summer holidays where the only stress of our day should be deciding what cocktail to order. Hot sunshine, white sands, crystal... Read more

    The 27 May 2017 by   Kellilash
  • Softening the Edges

    Softening Edges

    This post will probably be of interest to anyone who is growing trailing plants, such as tomatoes, courgettes and squashes, in containers. Read more

    The 27 May 2017 by   Mwillis