If you fall under one of the following criteria you are eligible to sign up for Medicare: 1  People 65 years of age and older. 2  Some people with disabilities under 65 years of age. 3  People with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant).
Stars that are located high on the y-axis are very luminous, and have a very large diameter. This is the realm of the giants on the H-R diagram. They are massive stars, but it is their great size (some have a radius more than 1 000 times the sun's, which is appr.
The primary of this system is estimated to be 250 times the size of our Sun, a minimum of 120 solar masses, and a million times as bright â making it one of the biggest and brightest stars ever observed. Eta Carinae, one of the most massive stars known, located in the Carina constellation. Credit: NASA.