RT @Astroguyz: Comet A1 Siding Spring reaches opposition tonite at 1UT/21EDT at 1.7 AU from the Sun, Mars-bound: heavens-above.com/comet.aspx?cid…
RT @Astroguyz: Comet A1 Siding Spring reaches opposition tonite at 1UT/21EDT at 1.7 AU from the Sun, Mars-bound: heavens-above.com/comet.aspx?cid…