In extragalactic Astronomy people often use kpc (kilo parsecs, or 1000 parsecs) or Mpc (mega parsecs, or 1,000,000 parsecs). For example the Sun is about 8 kpc from the centre of the galaxy and Virgo (the nearest large cluster of galaxies to us) is about 15-20 Mpc away.
Quick Answer. You can become a SilverSneakers member by having an eligible health plan. Eligibility can be determined by contacting your health provider's customer service department. SilverSneakers is offered to many Medicare plans throughout the nation. Keep Learning.
However, after you achieve your accreditation, you will need to apply for the PTAN, which allows you to bill CMS. To obtain your PTAN, you will need to submit a Medicare Enrollment Application, or CMS Form 855S, to the National Supplier Clearinghouse (NSC).