OORT

Astronomy's ___ cloud

• ___ cloud (astronomical sighting)

• ___ cloud (comet-filled region of space)

• ___ cloud (cosmic debris)

• ___ cloud (distant part of the solar system)

• ___ cloud (home for comets)

• ___ cloud (region of comets far beyond Pluto)

• ___ cloud (solar system outlier)

• ___ cloud (solar-system region)

• ___ cloud (theoretical source of comets)

• ___ cloud: solar system region beyond Pluto

• Astronomical cloud's name

• Cloud of comets and planetoids

• Comet astronomer

• Comet astronomer, Jan Hendrik

• Comet-bearing cloud

• Dutch astronomer

• Dutch astronomer Jan

• Dutch scientist for whom an astronomical cloud is named

• Kind of cloud

• Solar system's comet-intensive cloud

• Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)