Astrophysics (index)

Snow Line

(Frost Line, Ice Line, Water Line)
(distance from protostar cool enough for water to condense)

The Snow Line (also called the Frost Line, Ice Line, or Water Line) is the distance from a Protostar at which Ice can form and Ammonia (NH3) and Methane (CH4) can condense. The Temperature is estimated at 150K, i.e., in the 145K to 170K range for a typical Protoplanetary Disk. The solar systems' Snow Line is about 5 AU, nearly to Jupiter. In a general way, the Snow Line forms the outer bound of the Habitable Zone (HZ).


Referenced by:
Habitable Zone (HZ)