1) Astronomer 2) Comet astronomer 3) Comet astronomer, Jan Hendrik 4) Comet-bearing cloud 5) Dutch astronomer Jan 6) Dutch surname 7) Jan hendrix oort 8) Kind of cloud 9) Stargazer 10) Uranologist 
[n] - Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)
Jan Hendrix Oort noun Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)