1) Astronomic 2) Astrophysical 3) Cosmological 4) Enormously large 5) Exceedingly great 6) Extremely large 7) Inconceivably large 8) Larger than large 9) Lunar 10) Natural philosophy 11) Physical science 12) Physics 13) Planetary 14) Solar 15) Stellar 16) Very large 1) Astronomic 2) Big 3) Epic 4) Large 5) Vast 
• (a.) Of or pertaining to astronomy; in accordance with the methods or principles of astronomy.
[Adjective] To do with the stars and planets.
As`tro·nom'ic·al (-ĭ*k a l) adjective [ Latin astronomicus , Greek 
of, pertaining to, or connected with astronomy. · extremely large; exceedingly great; enormous: It takes an astronomical amount of money to build a car factory.
inconceivably large