Accretion • After • Aged • Approximate • Approximately • Believed • Bright • Characterized • Collision • Connected • Contains • Curves • Dark • Diameter • Dim • Discernible • Does • Ejection • Elliptical • End • Explains • Few • Flat • Formed • From • Glue • Gravitational • Have • High • Irregular • Larger • Loosely • Matter • Much • Named • Our • Propagate • Resides • Same • Significance • Solar • Spherical • Structure • Than • They • Type • Typical • Waves • Which • Young