Stars and the Galaxies

posted by .

if alpha centauri were to all of a sudden disappear, we wouldn't knknow 4 another 4.3 years. How come? Why would this be the case?

would this be the case because its really far away from us and it's 4.3 light years away. So if it suddenly just vanished out of sight, then it would definetly take 4.3 light years to get back, because that's how long it would take its light to travel.

please correct me if I'm wrong, and list any other info, thanks - by more info, i mean info that you know from the top of ur head, please no links, thanks

  • Stars and the Galaxies -

    Your explanation is correct.

    The 4.3 light year distance of Alpha Centauri means that the light we are seeing now was emitted 4.3 years ago. If the star ceased to exist NOW (which is not at all likely to happen), we would not know about it for 4.3 years, because light emitted before is still on the way here.

  • Stars and the Galaxies -

    thanks drwls, :-)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. radio message

    The nearest star beyond the sun is Alpha Centauri, 4.2 x 1016 meters away. If we received a radio message from the star today, how long ago would it have been sent?
  2. stats

    In a given situation, suppose H0 (null hypothesis) was not rejected at alpha= .02. Would H0 also be retained at alpha = .01?
  3. Science

    Y r the distances to the planets given in km, while the distances to stars & galaxies r given in light years?
  4. Science

    Y r the distances to the planets given in km, while the distances to stars & galaxies r given in light years?
  5. Science-Repost-Universe&Stars

    Give 2 reasons y elliptical galaxies are considered to be older & more evolved than spiral galaxies. They are considered to be older because they have little instellar matter and because they rarely form new stars like the other galaxies …
  6. Universe and the Stars-Please Check

    Give 2 reasons y elliptical galaxies are considered to be older & more evolved than spiral galaxies. They are considered to be older because they have little instellar matter and because they rarely form new stars like the other galaxies …
  7. Physics

    If astronauts could travel at v=0.89c, we on Earth would say it takes (4.20/0.890)=4.72 years to reach Alpha Centauri, 4.20 light years away. The astronaut would disagree. (a) How much time passes on the astronaut's clocks?
  8. physics

    Even though we have found an earth sized planet around the nearest star Alpha Centauri B, we're not even close to getting there. To see this let's think about the duration of a flight to Alpha Centauri B, which is about 4×1016 meters …
  9. astro

    ProximaCentauriisapproximatelythesamedistancefromEarth(slightly less than 4.3 light years) as Alpha Centauri A, but it has an apparent magnitude of +11.05, compared to Alpha Centauri A’s magnitude of -0.01. How much more luminous …
  10. Algebra

    A light year, the distance light travels in 1 year,is approximately 5.9x10^12 Alpha centauri A,b 4.3 How far in miles is Alpha Centauri A,B. Scientific notation! I thought the answer was 25.37 x10^12

More Similar Questions