G6V Star System Generated (Seed: 1767312458)
Star Details
Spectral Class: G8V
Temperature: 5,280 K
Mass: 0.92 sol
Luminosity: 0.75 lux
Habitable Zone (HZ)
Inner Boundary: 0.83 AU
Outer Boundary: 1.19 AU
Physical Limits
Snow Line: 4.16 AU
Max System Radius: 19.2 AU
Planetary System (10 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.68 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.97
Radius: 1.55
Gravity: 1.24 G
Time & Orbit
Eccentricity (e): 0.006
Orbit Range: 0.68 AU - 0.68 AU
Year: 214 Days
Day: 39.1 Hours
Environment
Temp: 143 °C
Axial Tilt: 28.7 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 1.03 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.61
Radius: 1.47
Gravity: 1.21 G
Time & Orbit
Eccentricity (e): 0.15
Orbit Range: 0.88 AU - 1.18 AU
Year: 398 Days
Day: 26.2 Hours
Environment
Temp: -2 °C
Axial Tilt: 2.1 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Planet 3 - Terrestrial
Semi-Major Axis: 1.12 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.06
Radius: 1.02
Gravity: 1.02 G
Time & Orbit
Eccentricity (e): 0.145
Orbit Range: 0.96 AU - 1.28 AU
Year: 451 Days
Day: 18.2 Hours
Environment
Temp: -13 °C
Axial Tilt: 179.3 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Satellites (1)
Outer Limit: 66,372,469 km
- M1: 570,117 km (0.03 R)
Planet 4 - Terrestrial
Semi-Major Axis: 1.68 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.14
Radius: 1.58
Gravity: 1.26 G
Time & Orbit
Eccentricity (e): 0.018
Orbit Range: 1.65 AU - 1.71 AU
Year: 829 Days
Day: 14.2 Hours
Environment
Temp: -61 °C
Axial Tilt: 0.6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 5 - Terrestrial
Semi-Major Axis: 3.94 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.34
Radius: 1.62
Gravity: 1.27 G
Time & Orbit
Eccentricity (e): 0.043
Orbit Range: 3.77 AU - 4.11 AU
Year: 2978 Days
Day: 27.1 Hours
Environment
Temp: -143 °C
Axial Tilt: 0.5 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 66,372,469 km
- M1: 783,743 km (0.095 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.55 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 24.6
Radius: 12.3
Gravity: 0.16 G
Time & Orbit
Eccentricity (e): 0.25
Orbit Range: 4.16 AU - 6.94 AU
Year: 4979 Days
Day: 13.9 Hours
Environment
Temp: -148 °C
Axial Tilt: 22.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (43)
Outer Limit: 66,372,469 km
- M1: 169,195 km (0.075 R)
- M2: 293,212 km (0.09 R)
- M3: 504,893 km (0.082 R)
- M4: 600,935 km (0.09 R)
- M5: 721,211 km (0.106 R)
- M6: 1,114,504 km (0.088 R)
- M7: 1,317,359 km (0.112 R)
- M8: 1,434,793 km (0.062 R)
- M9: 1,602,193 km (0.066 R)
- M10: 1,744,162 km (0.057 R)
- M11: 1,849,478 km (0.114 R)
- M12: 2,462,381 km (0.078 R)
- M13: 2,646,087 km (0.112 R)
- M14: 2,777,434 km (0.094 R)
- M15: 2,882,153 km (0.096 R)
- M16: 3,204,686 km (0.045 R)
- M17: 3,345,008 km (0.072 R)
- M18: 3,631,937 km (0.067 R)
- M19: 3,757,450 km (0.059 R)
- M20: 4,002,042 km (0.112 R)
- M21: 4,186,347 km (0.078 R)
- M22: 4,284,932 km (0.105 R)
- M23: 4,551,964 km (0.116 R)
- M24: 4,755,866 km (0.081 R)
- M25: 4,962,760 km (0.066 R)
- M26: 5,219,769 km (0.1 R)
- M27: 5,807,988 km (0.074 R)
- M28: 6,128,726 km (0.046 R)
- M29: 6,404,734 km (0.104 R)
- M30: 6,569,740 km (0.06 R)
- M31: 6,929,972 km (0.107 R)
- M32: 7,099,466 km (0.102 R)
- M33: 7,283,621 km (0.118 R)
- M34: 7,482,586 km (0.087 R)
- M35: 7,669,883 km (0.088 R)
- M36: 7,926,742 km (0.027 R)
- M37: 8,241,347 km (0.116 R)
- M38: 8,476,664 km (0.109 R)
- M39: 8,630,002 km (0.113 R)
- M40: 8,742,200 km (0.106 R)
- M41: 8,826,574 km (0.061 R)
- M42: 9,295,862 km (0.08 R)
- M43: 9,831,871 km (0.117 R)
Planet 7 - Gas Giant
Semi-Major Axis: 7.07 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 386.7
Radius: 8.9
Gravity: 4.88 G
Time & Orbit
Eccentricity (e): 0.117
Orbit Range: 6.24 AU - 7.9 AU
Year: 7159 Days
Day: 13.8 Hours
Environment
Temp: -173 °C
Axial Tilt: 39.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (80)
Outer Limit: 66,372,469 km
- M1: 125,363 km (0.117 R)
- M2: 266,733 km (0.058 R)
- M3: 695,780 km (0.111 R)
- M4: 772,523 km (0.101 R)
- M5: 838,945 km (0.12 R)
- M6: 1,154,896 km (0.106 R)
- M7: 1,278,912 km (0.079 R)
- M8: 1,358,797 km (0.088 R)
- M9: 1,490,144 km (0.12 R)
- M10: 1,909,318 km (0.11 R)
- M11: 2,057,120 km (0.075 R)
- M12: 2,227,961 km (0.109 R)
- M13: 2,344,498 km (0.101 R)
- M14: 2,563,509 km (0.081 R)
- M15: 2,893,971 km (0.112 R)
- M16: 2,978,793 km (0.109 R)
- M17: 3,042,821 km (0.076 R)
- M18: 3,150,830 km (0.084 R)
- M19: 3,871,443 km (0.092 R)
- M20: 4,012,215 km (0.043 R)
- M21: 4,154,632 km (0.101 R)
- M22: 4,592,056 km (0.11 R)
- M23: 4,866,718 km (0.087 R)
- M24: 5,044,141 km (0.109 R)
- M25: 5,120,885 km (0.069 R)
- M26: 5,327,479 km (0.097 R)
- M27: 5,484,258 km (0.096 R)
- M28: 5,563,246 km (0.108 R)
- M29: 5,963,719 km (0.036 R)
- M30: 6,044,951 km (0.092 R)
- M31: 6,263,364 km (0.088 R)
- M32: 6,373,617 km (0.112 R)
- M33: 6,623,895 km (0.079 R)
- M34: 6,736,243 km (0.104 R)
- M35: 7,076,877 km (0.081 R)
- M36: 7,834,440 km (0.074 R)
- M37: 8,495,364 km (0.071 R)
- M38: 9,205,355 km (0.11 R)
- M39: 9,870,318 km (0.089 R)
- M40: 10,485,315 km (0.094 R)
- M41: 11,246,170 km (0.118 R)
- M42: 11,313,189 km (0.11 R)
- M43: 11,548,806 km (0.084 R)
- M44: 11,650,233 km (0.061 R)
- M45: 12,646,406 km (0.099 R)
- M46: 14,100,796 km (0.04 R)
- M47: 14,281,810 km (0.076 R)
- M48: 15,013,493 km (0.097 R)
- M49: 15,235,346 km (0.119 R)
- M50: 15,982,737 km (0.115 R)
- M51: 16,551,209 km (0.1 R)
- M52: 18,691,506 km (0.055 R)
- M53: 19,531,498 km (0.118 R)
- M54: 19,733,306 km (0.109 R)
- M55: 19,854,629 km (0.111 R)
- M56: 20,588,407 km (0.103 R)
- M57: 20,670,536 km (0.086 R)
- M58: 21,705,604 km (0.083 R)
- M59: 22,334,812 km (0.118 R)
- M60: 22,715,090 km (0.072 R)
- M61: 22,927,370 km (0.08 R)
- M62: 23,439,443 km (0.098 R)
- M63: 24,867,056 km (0.075 R)
- M64: 24,954,570 km (0.069 R)
- M65: 25,481,305 km (0.115 R)
- M66: 26,993,440 km (0.075 R)
- M67: 27,308,343 km (0.072 R)
- M68: 28,351,788 km (0.044 R)
- M69: 28,443,043 km (0.101 R)
- M70: 28,763,631 km (0.11 R)
- M71: 28,947,338 km (0.059 R)
- M72: 29,039,191 km (0.08 R)
- M73: 29,131,343 km (0.102 R)
- M74: 29,964,454 km (0.081 R)
- M75: 30,290,577 km (0.095 R)
- M76: 30,524,099 km (0.1 R)
- M77: 30,852,317 km (0.117 R)
- M78: 30,946,264 km (0.038 R)
- M79: 31,040,361 km (0.105 R)
- M80: 31,275,828 km (0.088 R)
Planet 8 - Gas Giant
Semi-Major Axis: 7.38 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 300.4
Radius: 11.2
Gravity: 2.39 G
Time & Orbit
Eccentricity (e): 0.16
Orbit Range: 6.2 AU - 8.56 AU
Year: 7635 Days
Day: 8.7 Hours
Environment
Temp: -177 °C
Axial Tilt: 45.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 66,372,469 km
- M1: 146,905 km (0.08 R)
- M2: 418,724 km (0.082 R)
- M3: 724,353 km (0.045 R)
- M4: 798,853 km (0.066 R)
- M5: 876,494 km (0.072 R)
- M6: 1,169,556 km (0.035 R)
- M7: 1,382,284 km (0.063 R)
- M8: 1,987,109 km (0.083 R)
- M9: 2,095,417 km (0.091 R)
- M10: 2,187,270 km (0.101 R)
- M11: 2,587,894 km (0.101 R)
- M12: 2,706,674 km (0.119 R)
- M13: 2,908,781 km (0.096 R)
- M14: 3,200,198 km (0.079 R)
- M15: 3,544,871 km (0.077 R)
- M16: 3,677,265 km (0.032 R)
- M17: 3,947,140 km (0.116 R)
- M18: 4,176,922 km (0.09 R)
- M19: 4,363,919 km (0.086 R)
- M20: 4,529,973 km (0.092 R)
- M21: 4,697,972 km (0.055 R)
- M22: 5,065,234 km (0.106 R)
- M23: 5,139,734 km (0.084 R)
- M24: 5,365,776 km (0.087 R)
- M25: 6,036,872 km (0.072 R)
- M26: 6,195,596 km (0.116 R)
- M27: 6,734,447 km (0.073 R)
- M28: 6,844,103 km (0.061 R)
- M29: 7,344,657 km (0.106 R)
- M30: 7,627,995 km (0.119 R)
- M31: 7,771,011 km (0.081 R)
- M32: 8,351,900 km (0.097 R)
- M33: 8,440,312 km (0.091 R)
- M34: 8,677,424 km (0.069 R)
- M35: 8,856,792 km (0.028 R)
- M36: 9,709,949 km (0.099 R)
- M37: 9,833,966 km (0.09 R)
- M38: 10,020,963 km (0.116 R)
- M39: 10,209,157 km (0.073 R)
- M40: 11,006,065 km (0.05 R)
- M41: 11,395,767 km (0.049 R)
- M42: 11,559,427 km (0.102 R)
- M43: 12,255,357 km (0.058 R)
- M44: 12,490,525 km (0.114 R)
- M45: 12,896,832 km (0.041 R)
- M46: 13,101,782 km (0.073 R)
- M47: 13,204,555 km (0.097 R)
- M48: 13,445,557 km (0.089 R)
- M49: 13,583,935 km (0.117 R)
- M50: 13,688,056 km (0.032 R)
- M51: 13,792,325 km (0.12 R)
- M52: 14,779,073 km (0.11 R)
- M53: 14,886,185 km (0.109 R)
- M54: 15,425,485 km (0.039 R)
- M55: 15,570,296 km (0.082 R)
- M56: 15,971,069 km (0.116 R)
- M57: 16,338,481 km (0.051 R)
- M58: 16,634,236 km (0.104 R)
- M59: 16,857,436 km (0.102 R)
- M60: 18,638,848 km (0.103 R)
- M61: 18,909,320 km (0.078 R)
- M62: 19,103,349 km (0.102 R)
- M63: 19,258,931 km (0.116 R)
- M64: 20,838,684 km (0.032 R)
- M65: 21,159,572 km (0.11 R)
- M66: 21,320,689 km (0.061 R)
- M67: 21,482,105 km (0.063 R)
- M68: 22,706,114 km (0.11 R)
- M69: 23,243,620 km (0.068 R)
- M70: 23,368,235 km (0.061 R)
- M71: 23,451,411 km (0.061 R)
- M72: 23,618,213 km (0.05 R)
- M73: 24,162,749 km (0.081 R)
- M74: 24,669,138 km (0.069 R)
- M75: 24,838,632 km (0.105 R)
- M76: 25,477,864 km (0.074 R)
- M77: 25,864,125 km (0.108 R)
- M78: 26,122,631 km (0.115 R)
- M79: 27,121,645 km (0.071 R)
Planet 9 - Gas Giant
Semi-Major Axis: 7.63 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 822.3
Radius: 13.3
Gravity: 4.65 G
Time & Orbit
Eccentricity (e): 0.065
Orbit Range: 7.13 AU - 8.13 AU
Year: 8026 Days
Day: 8.1 Hours
Environment
Temp: -171 °C
Axial Tilt: 95.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (83)
Outer Limit: 66,372,469 km
- M1: 176,525 km (0.065 R)
- M2: 280,197 km (0.085 R)
- M3: 416,331 km (0.09 R)
- M4: 793,467 km (0.077 R)
- M5: 1,101,938 km (0.099 R)
- M6: 1,551,480 km (0.112 R)
- M7: 1,635,404 km (0.102 R)
- M8: 1,742,666 km (0.114 R)
- M9: 1,897,051 km (0.116 R)
- M10: 2,056,073 km (0.111 R)
- M11: 2,339,412 km (0.091 R)
- M12: 2,635,615 km (0.117 R)
- M13: 2,762,773 km (0.113 R)
- M14: 4,174,229 km (0.086 R)
- M15: 4,323,229 km (0.094 R)
- M16: 4,749,882 km (0.087 R)
- M17: 5,094,855 km (0.054 R)
- M18: 5,286,490 km (0.09 R)
- M19: 5,513,130 km (0.114 R)
- M20: 5,743,062 km (0.05 R)
- M21: 6,076,965 km (0.113 R)
- M22: 6,348,634 km (0.097 R)
- M23: 6,939,546 km (0.071 R)
- M24: 7,259,536 km (0.119 R)
- M25: 7,475,555 km (0.1 R)
- M26: 7,584,462 km (0.095 R)
- M27: 7,988,078 km (0.046 R)
- M28: 8,248,677 km (0.066 R)
- M29: 8,854,698 km (0.096 R)
- M30: 10,351,425 km (0.099 R)
- M31: 10,840,311 km (0.108 R)
- M32: 11,671,925 km (0.062 R)
- M33: 12,052,801 km (0.073 R)
- M34: 12,138,072 km (0.078 R)
- M35: 12,223,492 km (0.103 R)
- M36: 12,437,866 km (0.11 R)
- M37: 12,610,353 km (0.106 R)
- M38: 13,661,726 km (0.106 R)
- M39: 13,928,908 km (0.086 R)
- M40: 14,468,657 km (0.11 R)
- M41: 14,559,314 km (0.044 R)
- M42: 16,081,771 km (0.094 R)
- M43: 16,364,062 km (0.084 R)
- M44: 18,729,953 km (0.085 R)
- M45: 19,625,745 km (0.095 R)
- M46: 19,776,390 km (0.045 R)
- M47: 22,448,507 km (0.101 R)
- M48: 22,869,625 km (0.073 R)
- M49: 23,666,234 km (0.116 R)
- M50: 24,309,953 km (0.111 R)
- M51: 24,471,818 km (0.058 R)
- M52: 25,614,895 km (0.087 R)
- M53: 25,779,603 km (0.075 R)
- M54: 26,110,214 km (0.078 R)
- M55: 26,331,320 km (0.111 R)
- M56: 26,719,825 km (0.104 R)
- M57: 26,831,126 km (0.083 R)
- M58: 27,390,173 km (0.118 R)
- M59: 27,783,765 km (0.094 R)
- M60: 27,896,562 km (0.069 R)
- M61: 28,066,057 km (0.091 R)
- M62: 28,633,481 km (0.1 R)
- M63: 28,747,475 km (0.084 R)
- M64: 29,895,190 km (0.115 R)
- M65: 30,126,618 km (0.106 R)
- M66: 30,474,732 km (0.084 R)
- M67: 31,058,014 km (0.089 R)
- M68: 32,770,162 km (0.095 R)
- M69: 33,487,633 km (0.116 R)
- M70: 33,727,887 km (0.108 R)
- M71: 33,848,313 km (0.098 R)
- M72: 34,877,248 km (0.103 R)
- M73: 35,855,019 km (0.054 R)
- M74: 37,214,116 km (0.043 R)
- M75: 37,338,432 km (0.055 R)
- M76: 39,157,691 km (0.086 R)
- M77: 40,173,760 km (0.068 R)
- M78: 40,493,002 km (0.108 R)
- M79: 41,262,833 km (0.099 R)
- M80: 41,843,272 km (0.059 R)
- M81: 42,556,555 km (0.056 R)
- M82: 43,012,380 km (0.087 R)
- M83: 43,863,442 km (0.084 R)
Planet 10 - Gas Giant
Semi-Major Axis: 10.91 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 965.8
Radius: 10.1
Gravity: 9.47 G
Time & Orbit
Eccentricity (e): 0.223
Orbit Range: 8.48 AU - 13.34 AU
Year: 13723 Days
Day: 6.3 Hours
Environment
Temp: -194 °C
Axial Tilt: 10.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (90)
Outer Limit: 66,372,469 km
- M1: 142,417 km (0.09 R)
- M2: 223,798 km (0.086 R)
- M3: 341,831 km (0.101 R)
- M4: 655,538 km (0.088 R)
- M5: 1,148,313 km (0.104 R)
- M6: 2,220,481 km (0.092 R)
- M7: 2,476,892 km (0.106 R)
- M8: 2,675,558 km (0.112 R)
- M9: 2,879,460 km (0.1 R)
- M10: 3,448,231 km (0.082 R)
- M11: 3,595,884 km (0.099 R)
- M12: 3,821,328 km (0.064 R)
- M13: 4,012,813 km (0.091 R)
- M14: 4,168,245 km (0.034 R)
- M15: 4,933,887 km (0.089 R)
- M16: 5,269,286 km (0.062 R)
- M17: 5,397,042 km (0.106 R)
- M18: 5,612,164 km (0.113 R)
- M19: 6,822,261 km (0.114 R)
- M20: 7,195,957 km (0.114 R)
- M21: 8,061,081 km (0.083 R)
- M22: 8,356,836 km (0.078 R)
- M23: 8,656,182 km (0.109 R)
- M24: 8,807,126 km (0.091 R)
- M25: 9,214,032 km (0.118 R)
- M26: 9,575,161 km (0.1 R)
- M27: 10,578,514 km (0.058 R)
- M28: 11,120,059 km (0.1 R)
- M29: 11,229,564 km (0.11 R)
- M30: 11,339,219 km (0.105 R)
- M31: 11,559,876 km (0.076 R)
- M32: 11,949,280 km (0.043 R)
- M33: 12,970,584 km (0.074 R)
- M34: 13,433,440 km (0.052 R)
- M35: 14,256,378 km (0.077 R)
- M36: 15,460,342 km (0.08 R)
- M37: 15,582,563 km (0.102 R)
- M38: 16,074,590 km (0.09 R)
- M39: 16,822,131 km (0.102 R)
- M40: 17,010,774 km (0.086 R)
- M41: 17,453,733 km (0.067 R)
- M42: 18,351,021 km (0.11 R)
- M43: 19,394,766 km (0.092 R)
- M44: 20,256,898 km (0.119 R)
- M45: 21,403,267 km (0.068 R)
- M46: 22,363,086 km (0.05 R)
- M47: 22,709,256 km (0.098 R)
- M48: 23,477,142 km (0.118 R)
- M49: 23,547,453 km (0.058 R)
- M50: 24,752,015 km (0.085 R)
- M51: 24,966,688 km (0.044 R)
- M52: 25,253,916 km (0.106 R)
- M53: 25,759,108 km (0.074 R)
- M54: 28,036,287 km (0.099 R)
- M55: 28,185,436 km (0.115 R)
- M56: 30,071,566 km (0.099 R)
- M57: 32,544,867 km (0.106 R)
- M58: 33,173,328 km (0.087 R)
- M59: 33,568,117 km (0.117 R)
- M60: 33,964,551 km (0.089 R)
- M61: 34,522,102 km (0.069 R)
- M62: 34,601,987 km (0.111 R)
- M63: 35,565,547 km (0.076 R)
- M64: 38,260,703 km (0.113 R)
- M65: 39,841,952 km (0.05 R)
- M66: 40,767,215 km (0.091 R)
- M67: 44,364,595 km (0.072 R)
- M68: 45,673,876 km (0.059 R)
- M69: 45,849,354 km (0.105 R)
- M70: 46,465,398 km (0.096 R)
- M71: 47,527,992 km (0.09 R)
- M72: 47,705,863 km (0.057 R)
- M73: 47,973,045 km (0.077 R)
- M74: 48,598,514 km (0.098 R)
- M75: 49,586,907 km (0.081 R)
- M76: 51,583,291 km (0.051 R)
- M77: 52,407,575 km (0.087 R)
- M78: 53,328,649 km (0.092 R)
- M79: 53,883,807 km (0.045 R)
- M80: 54,254,959 km (0.119 R)
- M81: 55,560,649 km (0.062 R)
- M82: 55,841,893 km (0.097 R)
- M83: 56,029,489 km (0.077 R)
- M84: 56,782,415 km (0.119 R)
- M85: 58,298,290 km (0.083 R)
- M86: 59,348,168 km (0.103 R)
- M87: 61,757,442 km (0.11 R)
- M88: 62,437,663 km (0.07 R)
- M89: 64,788,893 km (0.087 R)
- M90: 66,074,537 km (0.094 R)
Kuiper Belt
Range: 30 - 48 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 438 - 16,027 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.