G3V Star System Generated (Seed: 1766427343)
Star Details
Spectral Class: G6V
Temperature: 5,520 K
Mass: 0.98 sol
Luminosity: 0.93 lux
Habitable Zone (HZ)
Inner Boundary: 0.92 AU
Outer Boundary: 1.32 AU
Physical Limits
Snow Line: 4.63 AU
Max System Radius: 19.8 AU
Planetary System (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.71 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.59
Radius: 1.67
Gravity: 1.29 G
Time & Orbit
Eccentricity (e): 0.155
Orbit Range: 0.6 AU - 0.82 AU
Year: 221 Days
Day: 24.1 Hours
Environment
Temp: 104 °C
Axial Tilt: 32.7 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 3.36 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.55
Radius: 1.83
Gravity: 1.36 G
Time & Orbit
Eccentricity (e): 0.18
Orbit Range: 2.76 AU - 3.96 AU
Year: 2272 Days
Day: 34.1 Hours
Environment
Temp: -112 °C
Axial Tilt: 33.1 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 57,697,300 km
- M1: 2,597,468 km (0.081 R)
Planet 3 - Gas Giant
Semi-Major Axis: 5.71 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 138.1
Radius: 13.2
Gravity: 0.79 G
Time & Orbit
Eccentricity (e): 0.055
Orbit Range: 5.4 AU - 6.02 AU
Year: 5034 Days
Day: 5 Hours
Environment
Temp: -148 °C
Axial Tilt: 31.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 57,697,300 km
- M1: 179,218 km (0.032 R)
- M2: 284,535 km (0.088 R)
- M3: 526,136 km (0.102 R)
- M4: 608,564 km (0.102 R)
- M5: 772,374 km (0.101 R)
- M6: 999,763 km (0.097 R)
- M7: 1,323,792 km (0.11 R)
- M8: 1,612,067 km (0.106 R)
- M9: 1,787,844 km (0.108 R)
- M10: 1,920,986 km (0.113 R)
- M11: 2,082,702 km (0.086 R)
- M12: 2,223,174 km (0.047 R)
- M13: 2,380,102 km (0.112 R)
- M14: 2,568,147 km (0.105 R)
- M15: 2,775,041 km (0.093 R)
- M16: 2,973,407 km (0.081 R)
- M17: 3,750,718 km (0.107 R)
- M18: 4,034,206 km (0.052 R)
- M19: 4,357,487 km (0.086 R)
- M20: 4,538,949 km (0.117 R)
- M21: 4,790,573 km (0.089 R)
- M22: 5,115,798 km (0.083 R)
- M23: 5,272,427 km (0.099 R)
- M24: 5,360,092 km (0.071 R)
- M25: 5,590,472 km (0.039 R)
- M26: 5,769,990 km (0.026 R)
- M27: 5,878,598 km (0.074 R)
- M28: 5,969,703 km (0.114 R)
- M29: 6,061,107 km (0.066 R)
- M30: 6,190,061 km (0.115 R)
- M31: 6,658,003 km (0.051 R)
- M32: 6,810,293 km (0.032 R)
- M33: 7,040,824 km (0.116 R)
- M34: 7,195,807 km (0.092 R)
- M35: 7,549,008 km (0.093 R)
- M36: 8,069,309 km (0.112 R)
- M37: 8,725,595 km (0.077 R)
- M38: 9,018,059 km (0.057 R)
- M39: 9,165,562 km (0.116 R)
- M40: 9,377,692 km (0.105 R)
- M41: 9,591,467 km (0.094 R)
- M42: 9,828,580 km (0.079 R)
- M43: 10,111,170 km (0.115 R)
- M44: 10,286,499 km (0.109 R)
- M45: 10,662,289 km (0.115 R)
- M46: 10,818,320 km (0.073 R)
- M47: 10,975,248 km (0.108 R)
- M48: 11,155,364 km (0.119 R)
- M49: 12,140,765 km (0.037 R)
- M50: 12,303,677 km (0.09 R)
- M51: 12,679,168 km (0.077 R)
- M52: 12,844,623 km (0.111 R)
- M53: 13,153,842 km (0.072 R)
- M54: 13,345,327 km (0.065 R)
- M55: 13,682,670 km (0.036 R)
- M56: 13,779,609 km (0.089 R)
- M57: 14,120,543 km (0.104 R)
- M58: 14,365,734 km (0.092 R)
- M59: 14,538,370 km (0.076 R)
- M60: 14,810,937 km (0.071 R)
- M61: 14,935,253 km (0.079 R)
- M62: 15,060,167 km (0.079 R)
- M63: 15,185,231 km (0.091 R)
- M64: 15,361,009 km (0.084 R)
- M65: 15,638,662 km (0.119 R)
- M66: 16,147,594 km (0.071 R)
- M67: 16,301,381 km (0.104 R)
- M68: 16,610,450 km (0.102 R)
- M69: 16,869,404 km (0.101 R)
- M70: 17,025,434 km (0.088 R)
- M71: 17,312,812 km (0.1 R)
- M72: 17,628,015 km (0.07 R)
- M73: 17,733,631 km (0.088 R)
Planet 4 - Gas Giant
Semi-Major Axis: 8.94 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 962.3
Radius: 13.6
Gravity: 5.2 G
Time & Orbit
Eccentricity (e): 0.147
Orbit Range: 7.63 AU - 10.25 AU
Year: 9862 Days
Day: 5.4 Hours
Environment
Temp: -176 °C
Axial Tilt: 28.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 57,697,300 km
- M1: 238,758 km (0.041 R)
- M2: 342,130 km (0.082 R)
- M3: 675,285 km (0.068 R)
- M4: 948,301 km (0.049 R)
- M5: 1,172,249 km (0.079 R)
- M6: 1,279,959 km (0.107 R)
- M7: 1,795,773 km (0.064 R)
- M8: 1,896,303 km (0.11 R)
- M9: 2,373,221 km (0.09 R)
- M10: 2,654,315 km (0.093 R)
- M11: 3,096,676 km (0.067 R)
- M12: 3,218,598 km (0.069 R)
- M13: 3,404,698 km (0.115 R)
- M14: 4,422,263 km (0.111 R)
- M15: 4,734,773 km (0.052 R)
- M16: 5,344,534 km (0.1 R)
- M17: 5,454,787 km (0.109 R)
- M18: 6,325,297 km (0.064 R)
- M19: 6,836,473 km (0.086 R)
- M20: 7,198,350 km (0.098 R)
- M21: 7,402,103 km (0.114 R)
- M22: 7,982,692 km (0.081 R)
- M23: 9,409,257 km (0.075 R)
- M24: 11,006,963 km (0.089 R)
- M25: 12,540,191 km (0.1 R)
- M26: 12,638,178 km (0.05 R)
- M27: 12,785,681 km (0.078 R)
- M28: 12,933,933 km (0.06 R)
- M29: 13,733,683 km (0.052 R)
- M30: 13,834,661 km (0.089 R)
- M31: 15,119,408 km (0.08 R)
- M32: 15,328,546 km (0.119 R)
- M33: 15,538,581 km (0.106 R)
- M34: 15,696,706 km (0.101 R)
- M35: 16,603,120 km (0.1 R)
- M36: 16,764,835 km (0.091 R)
- M37: 16,927,149 km (0.11 R)
- M38: 17,471,835 km (0.089 R)
- M39: 17,691,295 km (0.049 R)
- M40: 19,253,246 km (0.082 R)
- M41: 19,821,718 km (0.117 R)
- M42: 20,280,535 km (0.069 R)
- M43: 21,736,870 km (0.115 R)
- M44: 22,150,658 km (0.077 R)
- M45: 23,892,725 km (0.051 R)
- M46: 24,442,198 km (0.076 R)
- M47: 24,749,322 km (0.108 R)
- M48: 25,678,475 km (0.115 R)
- M49: 26,429,905 km (0.097 R)
- M50: 26,618,847 km (0.08 R)
- M51: 27,762,373 km (0.058 R)
- M52: 28,082,811 km (0.11 R)
- M53: 28,340,120 km (0.072 R)
- M54: 29,246,683 km (0.091 R)
- M55: 29,703,555 km (0.049 R)
- M56: 29,834,603 km (0.096 R)
- M57: 29,965,650 km (0.043 R)
- M58: 31,822,160 km (0.111 R)
- M59: 32,426,834 km (0.111 R)
- M60: 32,696,709 km (0.12 R)
- M61: 35,854,271 km (0.106 R)
- M62: 36,413,319 km (0.079 R)
- M63: 36,693,964 km (0.102 R)
- M64: 36,834,437 km (0.107 R)
- M65: 38,321,290 km (0.08 R)
- M66: 38,678,230 km (0.052 R)
- M67: 39,036,218 km (0.084 R)
- M68: 39,251,489 km (0.045 R)
- M69: 39,827,740 km (0.106 R)
- M70: 40,842,612 km (0.098 R)
- M71: 41,134,179 km (0.056 R)
- M72: 42,013,066 km (0.081 R)
- M73: 42,602,482 km (0.114 R)
- M74: 43,194,590 km (0.065 R)
- M75: 44,761,628 km (0.07 R)
- M76: 45,212,815 km (0.119 R)
- M77: 45,363,610 km (0.092 R)
- M78: 45,665,648 km (0.104 R)
- M79: 46,499,506 km (0.113 R)
- M80: 47,109,117 km (0.101 R)
- M81: 47,874,759 km (0.117 R)
- M82: 50,040,637 km (0.032 R)
- M83: 50,978,616 km (0.116 R)
- M84: 51,764,753 km (0.028 R)
- M85: 52,001,417 km (0.072 R)
- M86: 52,554,929 km (0.042 R)
Planet 5 - Gas Giant
Semi-Major Axis: 11.36 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 677.3
Radius: 8.9
Gravity: 8.55 G
Time & Orbit
Eccentricity (e): 0.173
Orbit Range: 9.39 AU - 13.33 AU
Year: 14127 Days
Day: 14.5 Hours
Environment
Temp: -185 °C
Axial Tilt: 48.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (90)
Outer Limit: 57,697,300 km
- M1: 112,647 km (0.099 R)
- M2: 470,485 km (0.08 R)
- M3: 572,810 km (0.093 R)
- M4: 822,339 km (0.106 R)
- M5: 1,128,267 km (0.084 R)
- M6: 1,704,069 km (0.052 R)
- M7: 2,270,297 km (0.028 R)
- M8: 3,562,224 km (0.104 R)
- M9: 3,772,709 km (0.103 R)
- M10: 4,279,845 km (0.042 R)
- M11: 4,963,508 km (0.114 R)
- M12: 5,119,987 km (0.101 R)
- M13: 5,198,825 km (0.087 R)
- M14: 5,762,360 km (0.082 R)
- M15: 6,218,783 km (0.071 R)
- M16: 6,303,157 km (0.066 R)
- M17: 6,601,006 km (0.113 R)
- M18: 7,299,179 km (0.105 R)
- M19: 7,883,658 km (0.106 R)
- M20: 8,112,543 km (0.116 R)
- M21: 8,529,921 km (0.071 R)
- M22: 8,859,485 km (0.104 R)
- M23: 8,954,330 km (0.055 R)
- M24: 9,289,280 km (0.062 R)
- M25: 9,434,091 km (0.114 R)
- M26: 11,332,039 km (0.111 R)
- M27: 13,671,600 km (0.12 R)
- M28: 14,952,008 km (0.034 R)
- M29: 15,292,194 km (0.082 R)
- M30: 15,865,153 km (0.08 R)
- M31: 15,980,493 km (0.097 R)
- M32: 16,096,282 km (0.12 R)
- M33: 17,150,049 km (0.075 R)
- M34: 17,864,828 km (0.112 R)
- M35: 18,955,397 km (0.077 R)
- M36: 19,262,072 km (0.047 R)
- M37: 20,192,272 km (0.109 R)
- M38: 20,946,843 km (0.049 R)
- M39: 21,073,403 km (0.096 R)
- M40: 21,263,991 km (0.086 R)
- M41: 21,518,756 km (0.091 R)
- M42: 21,582,634 km (0.1 R)
- M43: 21,838,746 km (0.099 R)
- M44: 21,967,251 km (0.118 R)
- M45: 23,003,814 km (0.111 R)
- M46: 23,134,563 km (0.045 R)
- M47: 23,396,658 km (0.046 R)
- M48: 24,721,946 km (0.1 R)
- M49: 25,057,195 km (0.055 R)
- M50: 25,191,683 km (0.115 R)
- M51: 27,168,469 km (0.09 R)
- M52: 27,445,076 km (0.06 R)
- M53: 27,653,166 km (0.119 R)
- M54: 28,140,556 km (0.056 R)
- M55: 28,210,418 km (0.058 R)
- M56: 28,701,099 km (0.081 R)
- M57: 30,047,331 km (0.091 R)
- M58: 30,476,677 km (0.097 R)
- M59: 31,486,462 km (0.077 R)
- M60: 32,360,563 km (0.097 R)
- M61: 32,507,019 km (0.095 R)
- M62: 33,168,989 km (0.052 R)
- M63: 34,356,647 km (0.045 R)
- M64: 35,407,273 km (0.092 R)
- M65: 35,860,704 km (0.05 R)
- M66: 36,088,242 km (0.075 R)
- M67: 36,240,084 km (0.096 R)
- M68: 36,468,371 km (0.099 R)
- M69: 36,773,401 km (0.062 R)
- M70: 39,557,267 km (0.057 R)
- M71: 39,792,286 km (0.073 R)
- M72: 43,131,160 km (0.071 R)
- M73: 43,292,427 km (0.086 R)
- M74: 43,373,060 km (0.06 R)
- M75: 46,311,013 km (0.1 R)
- M76: 47,804,000 km (0.113 R)
- M77: 48,892,025 km (0.116 R)
- M78: 50,411,939 km (0.089 R)
- M79: 51,433,842 km (0.103 R)
- M80: 51,604,833 km (0.059 R)
- M81: 52,204,720 km (0.089 R)
- M82: 52,290,739 km (0.116 R)
- M83: 52,807,001 km (0.079 R)
- M84: 53,671,378 km (0.117 R)
- M85: 54,540,392 km (0.075 R)
- M86: 55,940,478 km (0.111 R)
- M87: 56,204,219 km (0.068 R)
- M88: 56,380,446 km (0.101 R)
- M89: 58,062,674 km (0.113 R)
- M90: 59,581,840 km (0.105 R)
Planet 6 - Ice Giant
Semi-Major Axis: 18.06 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 326
Radius: 4.3
Gravity: 17.63 G
Time & Orbit
Eccentricity (e): 0.184
Orbit Range: 14.74 AU - 21.38 AU
Year: 28317 Days
Day: 21.4 Hours
Environment
Temp: -209 °C
Axial Tilt: 17.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 57,697,300 km
- M1: 139,874 km (0.09 R)
- M2: 720,912 km (0.036 R)
- M3: 915,539 km (0.104 R)
- M4: 992,731 km (0.025 R)
- M5: 1,590,973 km (0.104 R)
- M6: 2,563,958 km (0.061 R)
- M7: 2,859,115 km (0.096 R)
- M8: 3,126,147 km (0.119 R)
- M9: 3,481,292 km (0.07 R)
- M10: 4,229,132 km (0.047 R)
- M11: 4,533,115 km (0.091 R)
- M12: 4,709,939 km (0.094 R)
- M13: 5,253,877 km (0.074 R)
- M14: 5,300,103 km (0.116 R)
- M15: 5,346,329 km (0.116 R)
- M16: 7,001,031 km (0.069 R)
- M17: 7,051,894 km (0.091 R)
- M18: 7,205,381 km (0.092 R)
- M19: 7,256,694 km (0.108 R)
- M20: 7,672,276 km (0.103 R)
- M21: 7,882,910 km (0.086 R)
- M22: 9,130,706 km (0.095 R)
- M23: 9,919,685 km (0.095 R)
- M24: 10,206,764 km (0.049 R)
- M25: 10,496,535 km (0.068 R)
- M26: 10,847,940 km (0.105 R)
- M27: 11,441,993 km (0.113 R)
- M28: 11,864,158 km (0.101 R)
- M29: 12,291,410 km (0.065 R)
- M30: 13,098,191 km (0.114 R)
- M31: 14,501,868 km (0.111 R)
- M32: 16,559,437 km (0.11 R)
- M33: 17,518,210 km (0.112 R)
- M34: 18,424,324 km (0.114 R)
- M35: 18,918,596 km (0.085 R)
- M36: 20,064,665 km (0.084 R)
- M37: 20,792,309 km (0.03 R)
- M38: 22,273,328 km (0.118 R)
- M39: 22,348,276 km (0.089 R)
- M40: 24,790,312 km (0.099 R)
- M41: 25,413,836 km (0.083 R)
- M42: 25,884,920 km (0.116 R)
- M43: 26,121,583 km (0.069 R)
- M44: 27,315,374 km (0.097 R)
- M45: 30,169,403 km (0.091 R)
- M46: 31,842,206 km (0.109 R)
- M47: 35,452,003 km (0.119 R)
- M48: 35,890,175 km (0.111 R)
- M49: 36,330,292 km (0.086 R)
- M50: 37,750,574 km (0.068 R)
- M51: 37,839,884 km (0.117 R)
- M52: 37,929,343 km (0.075 R)
- M53: 39,279,315 km (0.025 R)
- M54: 41,103,511 km (0.107 R)
- M55: 41,656,125 km (0.12 R)
- M56: 41,840,879 km (0.12 R)
- M57: 42,768,834 km (0.036 R)
- M58: 42,955,233 km (0.095 R)
- M59: 44,456,149 km (0.106 R)
- M60: 46,165,005 km (0.089 R)
- M61: 48,185,773 km (0.083 R)
- M62: 48,671,069 km (0.103 R)
- M63: 49,842,570 km (0.068 R)
- M64: 51,815,616 km (0.039 R)
- M65: 52,412,362 km (0.074 R)
- M66: 52,512,144 km (0.119 R)
- M67: 52,611,926 km (0.108 R)
- M68: 54,216,662 km (0.088 R)
- M69: 54,519,298 km (0.115 R)
- M70: 54,822,533 km (0.089 R)
- M71: 57,474,006 km (0.068 R)
- M72: 58,608,407 km (0.107 R)
- M73: 59,230,135 km (0.066 R)
- M74: 60,062,647 km (0.069 R)
- M75: 60,689,612 km (0.106 R)
- M76: 61,423,689 km (0.054 R)
- M77: 61,949,825 km (0.065 R)
- M78: 63,218,863 km (0.044 R)
- M79: 63,431,143 km (0.078 R)
- M80: 63,962,963 km (0.107 R)
- M81: 64,282,803 km (0.094 R)
- M82: 65,031,092 km (0.036 R)
- M83: 65,352,578 km (0.101 R)
- M84: 66,644,206 km (0.112 R)
- M85: 66,752,215 km (0.116 R)
- M86: 67,944,211 km (0.071 R)
- M87: 68,052,969 km (0.116 R)
- M88: 69,471,456 km (0.1 R)
- M89: 71,120,324 km (0.113 R)
- M90: 72,115,898 km (0.117 R)
- M91: 73,450,311 km (0.105 R)
Planet 7 - Ice Giant
Semi-Major Axis: 18.33 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 142.5
Radius: 3.9
Gravity: 9.37 G
Time & Orbit
Eccentricity (e): 0.235
Orbit Range: 14.02 AU - 22.64 AU
Year: 28955 Days
Day: 16.3 Hours
Environment
Temp: -191 °C
Axial Tilt: 92.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 57,697,300 km
- M1: 82,279 km (0.025 R)
- M2: 144,063 km (0.062 R)
- M3: 276,307 km (0.052 R)
- M4: 492,476 km (0.087 R)
- M5: 1,232,537 km (0.065 R)
- M6: 1,427,014 km (0.044 R)
- M7: 1,451,997 km (0.085 R)
- M8: 1,683,425 km (0.1 R)
- M9: 1,898,995 km (0.069 R)
- M10: 2,238,283 km (0.112 R)
- M11: 2,535,385 km (0.068 R)
- M12: 3,947,439 km (0.065 R)
- M13: 4,268,775 km (0.119 R)
- M14: 4,414,334 km (0.081 R)
- M15: 4,450,985 km (0.111 R)
- M16: 5,517,169 km (0.071 R)
- M17: 5,795,571 km (0.085 R)
- M18: 5,835,663 km (0.103 R)
- M19: 5,875,905 km (0.094 R)
- M20: 6,078,461 km (0.067 R)
- M21: 8,589,910 km (0.081 R)
- M22: 8,819,692 km (0.113 R)
- M23: 8,865,918 km (0.107 R)
- M24: 9,051,569 km (0.101 R)
- M25: 9,379,487 km (0.072 R)
- M26: 9,663,574 km (0.063 R)
- M27: 10,977,043 km (0.117 R)
- M28: 12,242,192 km (0.119 R)
- M29: 13,286,984 km (0.101 R)
- M30: 13,446,156 km (0.055 R)
- M31: 15,628,041 km (0.115 R)
- M32: 16,190,379 km (0.093 R)
- M33: 16,474,166 km (0.106 R)
- M34: 18,387,224 km (0.113 R)
- M35: 20,308,210 km (0.116 R)
- M36: 20,430,432 km (0.113 R)
- M37: 21,915,340 km (0.105 R)
- M38: 24,077,777 km (0.107 R)
- M39: 24,207,179 km (0.049 R)
- M40: 24,401,507 km (0.111 R)
- M41: 24,726,733 km (0.108 R)
- M42: 27,311,485 km (0.117 R)
- M43: 27,513,891 km (0.073 R)
- M44: 27,987,966 km (0.085 R)
- M45: 30,818,657 km (0.101 R)
- M46: 30,958,980 km (0.09 R)
- M47: 31,310,984 km (0.029 R)
- M48: 32,303,416 km (0.09 R)
- M49: 33,738,957 km (0.095 R)
- M50: 34,246,244 km (0.112 R)
- M51: 34,756,073 km (0.096 R)
- M52: 35,415,351 km (0.042 R)
- M53: 35,857,114 km (0.113 R)
- M54: 36,004,767 km (0.118 R)
- M55: 36,448,923 km (0.099 R)
- M56: 37,044,023 km (0.098 R)
- M57: 38,621,383 km (0.11 R)
- M58: 39,380,143 km (0.11 R)
- M59: 40,681,495 km (0.075 R)
- M60: 41,144,052 km (0.056 R)
- M61: 41,530,912 km (0.119 R)
- M62: 41,841,178 km (0.111 R)
- M63: 46,507,136 km (0.072 R)
- M64: 47,071,568 km (0.035 R)
- M65: 47,152,501 km (0.104 R)
- M66: 47,233,284 km (0.091 R)
- M67: 48,696,800 km (0.084 R)
- M68: 49,927,691 km (0.11 R)
- M69: 51,085,728 km (0.095 R)
- M70: 51,168,755 km (0.101 R)
- M71: 53,091,387 km (0.1 R)
- M72: 55,207,897 km (0.114 R)
Kuiper Belt
Range: 30 - 47 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 279 - 12,741 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.