G9V Star System Generated (Seed: 1768705766)
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 (8 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.52 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.29
Radius: 1.39
Gravity: 1.19 G
Time & Orbit
Eccentricity (e): 0.187
Orbit Range: 0.42 AU - 0.62 AU
Year: 143 Days
Day: 39.5 Hours
Environment
Temp: 139 °C
Axial Tilt: 28.2 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Satellites (1)
Outer Limit: 105,340,103 km
- M1: 313,707 km (0.069 R)
Planet 2 - Terrestrial
Semi-Major Axis: 0.74 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.51
Radius: 0.76
Gravity: 0.88 G
Time & Orbit
Eccentricity (e): 0.03
Orbit Range: 0.72 AU - 0.76 AU
Year: 242 Days
Day: 24.1 Hours
Environment
Temp: 113 °C
Axial Tilt: 13.1 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 3 - Terrestrial
Semi-Major Axis: 2.81 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.36
Radius: 1.13
Gravity: 1.07 G
Time & Orbit
Eccentricity (e): 0.107
Orbit Range: 2.51 AU - 3.11 AU
Year: 1794 Days
Day: 41.3 Hours
Environment
Temp: -106 °C
Axial Tilt: 8.9 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 105,340,103 km
- M1: 146,157 km (0.03 R)
Planet 4 - Gas Giant
Semi-Major Axis: 5.37 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 654.3
Radius: 10.7
Gravity: 5.71 G
Time & Orbit
Eccentricity (e): 0.084
Orbit Range: 4.92 AU - 5.82 AU
Year: 4739 Days
Day: 10.4 Hours
Environment
Temp: -148 °C
Axial Tilt: 36.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 105,340,103 km
- M1: 157,377 km (0.086 R)
- M2: 245,939 km (0.098 R)
- M3: 471,682 km (0.058 R)
- M4: 684,859 km (0.089 R)
- M5: 943,065 km (0.079 R)
- M6: 1,022,651 km (0.091 R)
- M7: 1,276,070 km (0.089 R)
- M8: 1,677,441 km (0.109 R)
- M9: 1,960,929 km (0.114 R)
- M10: 2,047,247 km (0.034 R)
- M11: 2,405,534 km (0.073 R)
- M12: 2,725,972 km (0.113 R)
- M13: 3,060,024 km (0.107 R)
- M14: 3,160,853 km (0.112 R)
- M15: 3,491,016 km (0.072 R)
- M16: 3,617,725 km (0.099 R)
- M17: 3,919,315 km (0.034 R)
- M18: 4,387,107 km (0.108 R)
- M19: 4,896,488 km (0.105 R)
- M20: 5,014,820 km (0.039 R)
- M21: 5,845,088 km (0.059 R)
- M22: 6,046,596 km (0.104 R)
- M23: 6,122,891 km (0.062 R)
- M24: 6,430,913 km (0.098 R)
- M25: 6,560,764 km (0.109 R)
- M26: 7,575,935 km (0.071 R)
- M27: 8,383,315 km (0.088 R)
- M28: 8,725,595 km (0.117 R)
- M29: 9,014,169 km (0.11 R)
- M30: 9,130,556 km (0.066 R)
- M31: 9,482,560 km (0.116 R)
- M32: 9,928,960 km (0.104 R)
- M33: 10,321,355 km (0.112 R)
- M34: 10,718,837 km (0.061 R)
- M35: 10,935,006 km (0.108 R)
- M36: 11,277,585 km (0.115 R)
- M37: 11,813,893 km (0.056 R)
- M38: 12,069,257 km (0.111 R)
- M39: 12,423,355 km (0.043 R)
- M40: 12,813,506 km (0.043 R)
- M41: 13,108,813 km (0.075 R)
- M42: 13,406,213 km (0.081 R)
- M43: 14,482,121 km (0.065 R)
- M44: 14,755,436 km (0.102 R)
- M45: 16,041,679 km (0.092 R)
- M46: 16,608,954 km (0.054 R)
- M47: 17,182,811 km (0.069 R)
- M48: 17,363,526 km (0.03 R)
- M49: 17,872,757 km (0.116 R)
- M50: 18,055,865 km (0.094 R)
- M51: 18,460,826 km (0.035 R)
- M52: 18,571,678 km (0.038 R)
- M53: 18,906,029 km (0.073 R)
- M54: 19,279,725 km (0.075 R)
- M55: 19,467,470 km (0.032 R)
- M56: 19,618,115 km (0.076 R)
- M57: 19,731,361 km (0.092 R)
- M58: 19,958,450 km (0.107 R)
- M59: 20,034,446 km (0.08 R)
- M60: 20,377,175 km (0.097 R)
- M61: 20,491,916 km (0.072 R)
- M62: 20,568,510 km (0.102 R)
- M63: 20,645,105 km (0.084 R)
- M64: 21,107,212 km (0.107 R)
- M65: 21,767,687 km (0.069 R)
- M66: 22,553,375 km (0.038 R)
- M67: 23,468,465 km (0.1 R)
- M68: 23,749,410 km (0.077 R)
- M69: 24,517,445 km (0.112 R)
- M70: 24,598,827 km (0.099 R)
- M71: 25,129,600 km (0.074 R)
- M72: 25,334,848 km (0.042 R)
- M73: 25,581,685 km (0.111 R)
- M74: 26,996,133 km (0.119 R)
- M75: 27,290,541 km (0.045 R)
- M76: 27,501,325 km (0.093 R)
- M77: 27,755,192 km (0.105 R)
- M78: 27,882,350 km (0.071 R)
- M79: 28,521,283 km (0.097 R)
Planet 5 - Gas Giant
Semi-Major Axis: 7.8 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 829.1
Radius: 9.3
Gravity: 9.59 G
Time & Orbit
Eccentricity (e): 0.095
Orbit Range: 7.06 AU - 8.54 AU
Year: 8295 Days
Day: 14.6 Hours
Environment
Temp: -168 °C
Axial Tilt: 5.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (83)
Outer Limit: 105,340,103 km
- M1: 373,097 km (0.086 R)
- M2: 489,035 km (0.04 R)
- M3: 680,072 km (0.089 R)
- M4: 1,002,904 km (0.07 R)
- M5: 1,602,642 km (0.054 R)
- M6: 1,756,728 km (0.1 R)
- M7: 1,915,900 km (0.11 R)
- M8: 2,056,073 km (0.083 R)
- M9: 2,471,955 km (0.114 R)
- M10: 2,834,132 km (0.117 R)
- M11: 3,130,635 km (0.099 R)
- M12: 3,213,213 km (0.114 R)
- M13: 3,608,301 km (0.108 R)
- M14: 3,724,089 km (0.101 R)
- M15: 3,782,433 km (0.077 R)
- M16: 3,989,177 km (0.06 R)
- M17: 4,108,855 km (0.109 R)
- M18: 4,352,101 km (0.075 R)
- M19: 4,631,400 km (0.076 R)
- M20: 5,207,502 km (0.028 R)
- M21: 5,637,596 km (0.058 R)
- M22: 5,908,069 km (0.045 R)
- M23: 5,976,285 km (0.045 R)
- M24: 6,426,575 km (0.088 R)
- M25: 6,532,041 km (0.086 R)
- M26: 7,104,403 km (0.12 R)
- M27: 7,249,962 km (0.04 R)
- M28: 7,359,766 km (0.115 R)
- M29: 7,730,021 km (0.067 R)
- M30: 7,955,016 km (0.1 R)
- M31: 9,191,443 km (0.103 R)
- M32: 9,310,523 km (0.111 R)
- M33: 9,390,109 km (0.111 R)
- M34: 9,509,937 km (0.064 R)
- M35: 9,953,644 km (0.12 R)
- M36: 10,157,695 km (0.03 R)
- M37: 11,580,970 km (0.091 R)
- M38: 11,838,727 km (0.062 R)
- M39: 11,925,045 km (0.087 R)
- M40: 12,054,896 km (0.112 R)
- M41: 12,228,728 km (0.094 R)
- M42: 12,447,141 km (0.062 R)
- M43: 12,534,955 km (0.085 R)
- M44: 13,155,188 km (0.069 R)
- M45: 13,876,100 km (0.092 R)
- M46: 13,967,205 km (0.069 R)
- M47: 14,841,754 km (0.069 R)
- M48: 15,544,864 km (0.072 R)
- M49: 15,924,245 km (0.119 R)
- M50: 16,067,260 km (0.082 R)
- M51: 16,258,745 km (0.116 R)
- M52: 16,450,979 km (0.098 R)
- M53: 18,413,852 km (0.101 R)
- M54: 20,088,152 km (0.076 R)
- M55: 20,657,072 km (0.106 R)
- M56: 21,231,379 km (0.119 R)
- M57: 21,916,686 km (0.104 R)
- M58: 22,022,751 km (0.108 R)
- M59: 22,662,881 km (0.107 R)
- M60: 24,840,427 km (0.089 R)
- M61: 26,460,572 km (0.088 R)
- M62: 26,686,615 km (0.091 R)
- M63: 27,140,943 km (0.06 R)
- M64: 28,287,611 km (0.069 R)
- M65: 28,634,678 km (0.053 R)
- M66: 29,157,971 km (0.103 R)
- M67: 30,037,008 km (0.101 R)
- M68: 30,391,107 km (0.102 R)
- M69: 31,761,274 km (0.055 R)
- M70: 32,969,127 km (0.107 R)
- M71: 33,395,331 km (0.086 R)
- M72: 34,191,790 km (0.118 R)
- M73: 35,242,865 km (0.091 R)
- M74: 35,367,181 km (0.073 R)
- M75: 36,053,685 km (0.093 R)
- M76: 36,116,217 km (0.117 R)
- M77: 36,933,770 km (0.093 R)
- M78: 37,123,310 km (0.054 R)
- M79: 39,875,013 km (0.108 R)
- M80: 41,046,215 km (0.113 R)
- M81: 44,090,382 km (0.082 R)
- M82: 44,492,800 km (0.098 R)
- M83: 45,031,353 km (0.096 R)
Planet 6 - Gas Giant
Semi-Major Axis: 9.64 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 115.2
Radius: 13.2
Gravity: 0.66 G
Time & Orbit
Eccentricity (e): 0.08
Orbit Range: 8.87 AU - 10.41 AU
Year: 11398 Days
Day: 8.5 Hours
Environment
Temp: -181 °C
Axial Tilt: 36.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (48)
Outer Limit: 105,340,103 km
- M1: 291,566 km (0.106 R)
- M2: 494,720 km (0.092 R)
- M3: 1,031,328 km (0.1 R)
- M4: 1,683,874 km (0.111 R)
- M5: 1,782,010 km (0.08 R)
- M6: 2,283,611 km (0.096 R)
- M7: 2,654,913 km (0.104 R)
- M8: 3,085,905 km (0.093 R)
- M9: 3,434,169 km (0.09 R)
- M10: 3,560,280 km (0.044 R)
- M11: 3,773,756 km (0.09 R)
- M12: 4,371,549 km (0.1 R)
- M13: 4,531,469 km (0.063 R)
- M14: 4,693,334 km (0.113 R)
- M15: 5,531,680 km (0.087 R)
- M16: 6,031,637 km (0.079 R)
- M17: 6,703,181 km (0.107 R)
- M18: 8,342,924 km (0.106 R)
- M19: 9,650,409 km (0.046 R)
- M20: 10,618,756 km (0.109 R)
- M21: 10,865,742 km (0.053 R)
- M22: 11,681,499 km (0.098 R)
- M23: 12,419,466 km (0.092 R)
- M24: 12,647,154 km (0.113 R)
- M25: 13,571,668 km (0.087 R)
- M26: 13,806,088 km (0.118 R)
- M27: 15,871,137 km (0.102 R)
- M28: 16,153,728 km (0.073 R)
- M29: 16,331,151 km (0.1 R)
- M30: 16,544,926 km (0.108 R)
- M31: 16,903,363 km (0.071 R)
- M32: 17,228,140 km (0.066 R)
- M33: 18,067,533 km (0.117 R)
- M34: 20,857,833 km (0.085 R)
- M35: 21,012,367 km (0.103 R)
- M36: 21,167,351 km (0.037 R)
- M37: 21,791,174 km (0.093 R)
- M38: 23,658,604 km (0.12 R)
- M39: 24,143,451 km (0.103 R)
- M40: 24,590,898 km (0.05 R)
- M41: 24,836,238 km (0.119 R)
- M42: 25,205,596 km (0.119 R)
- M43: 25,949,695 km (0.104 R)
- M44: 26,449,801 km (0.112 R)
- M45: 26,659,238 km (0.087 R)
- M46: 27,459,736 km (0.079 R)
- M47: 27,841,660 km (0.081 R)
- M48: 28,012,052 km (0.062 R)
Planet 7 - Gas Giant
Semi-Major Axis: 10.87 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 948
Radius: 9.9
Gravity: 9.67 G
Time & Orbit
Eccentricity (e): 0.103
Orbit Range: 9.75 AU - 11.99 AU
Year: 13647 Days
Day: 9.8 Hours
Environment
Temp: -188 °C
Axial Tilt: 43.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (96)
Outer Limit: 105,340,103 km
- M1: 231,727 km (0.08 R)
- M2: 463,903 km (0.099 R)
- M3: 534,364 km (0.095 R)
- M4: 609,013 km (0.071 R)
- M5: 969,245 km (0.102 R)
- M6: 1,635,404 km (0.1 R)
- M7: 1,953,599 km (0.112 R)
- M8: 2,451,311 km (0.049 R)
- M9: 3,127,194 km (0.108 R)
- M10: 3,269,013 km (0.117 R)
- M11: 3,413,075 km (0.065 R)
- M12: 3,745,033 km (0.062 R)
- M13: 4,126,059 km (0.094 R)
- M14: 4,242,895 km (0.102 R)
- M15: 4,479,708 km (0.109 R)
- M16: 4,761,700 km (0.107 R)
- M17: 4,925,360 km (0.086 R)
- M18: 6,984,575 km (0.067 R)
- M19: 7,500,837 km (0.106 R)
- M20: 7,691,575 km (0.119 R)
- M21: 8,322,728 km (0.06 R)
- M22: 8,819,692 km (0.091 R)
- M23: 9,738,223 km (0.096 R)
- M24: 10,580,160 km (0.103 R)
- M25: 11,335,779 km (0.053 R)
- M26: 12,109,050 km (0.096 R)
- M27: 13,822,394 km (0.092 R)
- M28: 13,998,022 km (0.103 R)
- M29: 15,368,040 km (0.114 R)
- M30: 15,793,346 km (0.088 R)
- M31: 17,470,339 km (0.09 R)
- M32: 18,555,073 km (0.047 R)
- M33: 19,072,981 km (0.085 R)
- M34: 19,990,913 km (0.085 R)
- M35: 20,189,579 km (0.077 R)
- M36: 23,245,714 km (0.096 R)
- M37: 24,508,021 km (0.057 R)
- M38: 26,442,920 km (0.098 R)
- M39: 28,055,585 km (0.105 R)
- M40: 28,203,836 km (0.075 R)
- M41: 29,473,922 km (0.083 R)
- M42: 29,549,170 km (0.109 R)
- M43: 30,305,537 km (0.079 R)
- M44: 30,381,532 km (0.09 R)
- M45: 31,606,141 km (0.07 R)
- M46: 31,914,761 km (0.076 R)
- M47: 32,146,937 km (0.092 R)
- M48: 32,457,352 km (0.114 R)
- M49: 34,340,640 km (0.052 R)
- M50: 34,816,960 km (0.09 R)
- M51: 35,295,523 km (0.119 R)
- M52: 36,178,450 km (0.1 R)
- M53: 36,987,475 km (0.034 R)
- M54: 38,294,213 km (0.113 R)
- M55: 38,705,756 km (0.047 R)
- M56: 39,035,919 km (0.115 R)
- M57: 39,616,059 km (0.09 R)
- M58: 40,868,941 km (0.031 R)
- M59: 41,711,327 km (0.097 R)
- M60: 42,049,867 km (0.116 R)
- M61: 42,389,305 km (0.075 R)
- M62: 42,644,519 km (0.056 R)
- M63: 43,156,592 km (0.081 R)
- M64: 43,842,349 km (0.085 R)
- M65: 44,100,405 km (0.097 R)
- M66: 45,311,549 km (0.048 R)
- M67: 45,659,664 km (0.076 R)
- M68: 46,008,526 km (0.066 R)
- M69: 46,270,771 km (0.071 R)
- M70: 46,533,614 km (0.097 R)
- M71: 47,324,987 km (0.117 R)
- M72: 47,413,100 km (0.098 R)
- M73: 48,831,737 km (0.109 R)
- M74: 49,815,193 km (0.099 R)
- M75: 52,895,862 km (0.097 R)
- M76: 53,537,787 km (0.105 R)
- M77: 53,905,648 km (0.104 R)
- M78: 54,366,858 km (0.118 R)
- M79: 54,736,664 km (0.093 R)
- M80: 55,014,617 km (0.04 R)
- M81: 55,757,969 km (0.103 R)
- M82: 56,037,717 km (0.107 R)
- M83: 56,317,764 km (0.083 R)
- M84: 57,254,845 km (0.097 R)
- M85: 57,348,942 km (0.11 R)
- M86: 59,620,137 km (0.102 R)
- M87: 60,096,905 km (0.095 R)
- M88: 60,670,912 km (0.05 R)
- M89: 61,438,948 km (0.103 R)
- M90: 61,920,503 km (0.115 R)
- M91: 62,403,555 km (0.071 R)
- M92: 62,500,195 km (0.07 R)
- M93: 62,887,654 km (0.118 R)
- M94: 63,275,860 km (0.097 R)
- M95: 64,347,579 km (0.114 R)
- M96: 64,836,764 km (0.111 R)
Planet 8 - Ice Giant
Semi-Major Axis: 17.15 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 994
Radius: 4.6
Gravity: 46.98 G
Time & Orbit
Eccentricity (e): 0.031
Orbit Range: 16.62 AU - 17.68 AU
Year: 27045 Days
Day: 19.8 Hours
Environment
Temp: -193 °C
Axial Tilt: 29.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 105,340,103 km
- M1: 60,587 km (0.031 R)
- M2: 94,396 km (0.104 R)
- M3: 1,801,906 km (0.115 R)
- M4: 2,091,229 km (0.075 R)
- M5: 2,176,499 km (0.079 R)
- M6: 2,712,509 km (0.048 R)
- M7: 2,899,805 km (0.106 R)
- M8: 3,188,828 km (0.085 R)
- M9: 3,537,541 km (0.106 R)
- M10: 3,793,952 km (0.089 R)
- M11: 4,710,089 km (0.092 R)
- M12: 4,822,138 km (0.105 R)
- M13: 6,234,790 km (0.054 R)
- M14: 6,669,372 km (0.104 R)
- M15: 6,858,614 km (0.094 R)
- M16: 6,985,772 km (0.092 R)
- M17: 7,371,734 km (0.054 R)
- M18: 7,436,809 km (0.115 R)
- M19: 8,434,777 km (0.113 R)
- M20: 11,594,733 km (0.098 R)
- M21: 12,281,536 km (0.11 R)
- M22: 14,015,077 km (0.032 R)
- M23: 14,664,182 km (0.032 R)
- M24: 15,823,565 km (0.107 R)
- M25: 17,184,307 km (0.105 R)
- M26: 18,582,000 km (0.072 R)
- M27: 18,759,274 km (0.111 R)
- M28: 19,473,903 km (0.119 R)
- M29: 20,197,508 km (0.098 R)
- M30: 20,379,718 km (0.114 R)
- M31: 21,206,695 km (0.111 R)
- M32: 23,178,395 km (0.067 R)
- M33: 23,656,360 km (0.07 R)
- M34: 27,293,384 km (0.083 R)
- M35: 28,611,939 km (0.097 R)
- M36: 32,369,987 km (0.088 R)
- M37: 32,690,127 km (0.103 R)
- M38: 32,797,089 km (0.043 R)
- M39: 32,904,052 km (0.054 R)
- M40: 33,872,847 km (0.042 R)
- M41: 37,168,788 km (0.097 R)
- M42: 37,391,988 km (0.119 R)
- M43: 38,515,468 km (0.078 R)
- M44: 39,308,337 km (0.088 R)
- M45: 39,535,875 km (0.102 R)
- M46: 40,680,149 km (0.072 R)
- M47: 42,067,669 km (0.079 R)
- M48: 42,884,025 km (0.104 R)
- M49: 43,001,160 km (0.113 R)
- M50: 44,414,261 km (0.102 R)
- M51: 44,532,593 km (0.087 R)
- M52: 44,769,856 km (0.102 R)
- M53: 45,484,036 km (0.106 R)
- M54: 45,722,794 km (0.101 R)
- M55: 46,081,978 km (0.056 R)
- M56: 50,463,551 km (0.115 R)
- M57: 50,834,553 km (0.105 R)
- M58: 51,704,016 km (0.067 R)
- M59: 53,583,414 km (0.097 R)
- M60: 54,214,867 km (0.09 R)
- M61: 57,022,520 km (0.073 R)
- M62: 60,007,745 km (0.115 R)
- M63: 60,138,643 km (0.085 R)
- M64: 61,981,839 km (0.058 R)
- M65: 66,534,700 km (0.099 R)
- M66: 66,670,236 km (0.105 R)
- M67: 67,757,812 km (0.092 R)
- M68: 68,851,223 km (0.055 R)
- M69: 68,988,255 km (0.053 R)
- M70: 74,827,209 km (0.049 R)
- M71: 75,532,863 km (0.081 R)
- M72: 76,666,366 km (0.07 R)
- M73: 76,950,602 km (0.108 R)
- M74: 79,237,355 km (0.06 R)
- M75: 80,100,534 km (0.103 R)
- M76: 80,244,747 km (0.078 R)
- M77: 81,546,248 km (0.105 R)
- M78: 85,050,877 km (0.092 R)
- M79: 87,711,476 km (0.062 R)
- M80: 89,500,217 km (0.029 R)
- M81: 90,399,151 km (0.094 R)
- M82: 91,000,086 km (0.09 R)
- M83: 91,150,581 km (0.096 R)
- M84: 93,568,831 km (0.104 R)
- M85: 94,633,519 km (0.093 R)
- M86: 94,785,959 km (0.047 R)
- M87: 95,549,207 km (0.052 R)
- M88: 99,086,748 km (0.116 R)
- M89: 101,105,123 km (0.09 R)
- M90: 102,041,156 km (0.096 R)
- M91: 102,197,486 km (0.116 R)
- M92: 102,980,182 km (0.051 R)
Kuiper Belt
Range: 30 - 60 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 160 - 16,835 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.