Homework Help

What is the "cosmic address" of globular cluster M15?

user profile pic

ninjasha | eNoter

Posted April 3, 2012 at 5:33 AM via web

dislike 0 like

What is the "cosmic address" of globular cluster M15?

3 Answers | Add Yours

user profile pic

belarafon | High School Teacher | (Level 2) Educator Emeritus

Posted April 3, 2012 at 6:09 AM (Answer #2)

dislike 0 like

Globular Cluster M15, also known as Messier 15, is a tightly-packed ball of stars orbiting roughly together in the constellation Pegasus. It is a remnant of star growth and activity from the birth of the Milky Way Galaxy, and is visible from Earth with binoculars on clear nights.

The "Cosmic Address" of a stellar object is based in orbits and positions relative to other objects; because most things in the universe are in a constant state of motion, we can only assign a common relative position to an object as long as it is not overtly moving around. For example, M15 is part of the constellation Pegasus, so it hasn't moved outside of that area for a long time. Its position relative to our solar system is about 33.6 thousand light-years; it occupies the NQ4 quadrant of the sky, inside Pegasus, near the bright Epsilon star. If one were to address a letter to M15, the address would read: "Messier 15, 3.5 deg W and 2.25 deg N of Epsilon, Pegasus Constellation, Quadrant NQ4, Milky Way Galaxy" (messier.seds.org).

Sources:

user profile pic

astrosonuthird | Student | Valedictorian

Posted July 30, 2012 at 10:43 AM (Answer #3)

dislike 0 like

It is based in orbits and positions relative to other objects.

user profile pic

astrosonuthird | Student | Valedictorian

Posted August 27, 2012 at 2:32 PM (Answer #4)

dislike 0 like

Yeah! You are right.

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes