disc galaxies造句

• The galactic disc is the plane in which the spirals, bars and discs of disc galaxies exist.
• It has been noted that the orbital velocity of stars in the disc of most disc galaxies is inconsistent with the amount of luminous matter calculated for the galaxy.
• The theory of the Rossby wave instability ( RWI ) in accretion discs was developed by Lovelace et al . and Li et al . for thin Keplerian discs with negligible self-gravity and earlier by Lovelace and Hohlfeld for thin disc galaxies where the self-gravity may or may not be important and where the rotation is in general non-Keplerian.