Star System Generated (Seed: 1766674732)
Star Details
Spectral Class: M5V
Temperature: 3,050 K
Mass: 0.3 sol
Luminosity: 0.01 lux
Habitable Zone (HZ)
Inner Boundary: 0.1 AU
Outer Boundary: 0.14 AU
Physical Limits
Snow Line: 0.48 AU
Max System Radius: 11 AU
Planetary System (6 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 1.3 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 530.6
Radius: 10
Gravity: 5.31 G
Time & Orbit
Eccentricity (e): 0.175
Orbit Range: 1.07 AU - 1.53 AU
Year: 988 Days
Day: 8.8 Hours
Environment
Temp: -176 °C
Axial Tilt: 16.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (61)
Outer Limit: 50,716,778 km
- M1: 124,615 km (0.117 R)
- M2: 201,508 km (0.082 R)
- M3: 278,252 km (0.093 R)
- M4: 387,758 km (0.079 R)
- M5: 515,215 km (0.062 R)
- M6: 595,250 km (0.102 R)
- M7: 669,301 km (0.093 R)
- M8: 769,531 km (0.119 R)
- M9: 839,394 km (0.104 R)
- M10: 924,066 km (0.094 R)
- M11: 1,011,581 km (0.082 R)
- M12: 1,076,057 km (0.087 R)
- M13: 1,355,506 km (0.096 R)
- M14: 1,485,507 km (0.112 R)
- M15: 1,635,105 km (0.116 R)
- M16: 1,957,339 km (0.072 R)
- M17: 2,063,703 km (0.112 R)
- M18: 2,180,539 km (0.061 R)
- M19: 2,256,833 km (0.106 R)
- M20: 2,918,355 km (0.043 R)
- M21: 3,231,912 km (0.113 R)
- M22: 3,299,830 km (0.072 R)
- M23: 3,397,667 km (0.064 R)
- M24: 3,566,413 km (0.033 R)
- M25: 3,636,724 km (0.114 R)
- M26: 3,809,360 km (0.037 R)
- M27: 4,036,749 km (0.05 R)
- M28: 4,375,738 km (0.09 R)
- M29: 4,450,985 km (0.104 R)
- M30: 4,603,126 km (0.099 R)
- M31: 4,756,913 km (0.099 R)
- M32: 4,968,444 km (0.081 R)
- M33: 5,035,764 km (0.077 R)
- M34: 5,239,965 km (0.111 R)
- M35: 5,354,557 km (0.111 R)
- M36: 5,458,527 km (0.1 R)
- M37: 5,916,297 km (0.095 R)
- M38: 6,023,857 km (0.055 R)
- M39: 6,277,127 km (0.077 R)
- M40: 6,350,130 km (0.09 R)
- M41: 6,521,570 km (0.099 R)
- M42: 6,620,155 km (0.1 R)
- M43: 6,719,338 km (0.082 R)
- M44: 6,831,536 km (0.045 R)
- M45: 6,894,068 km (0.105 R)
- M46: 7,108,292 km (0.039 R)
- M47: 7,222,585 km (0.102 R)
- M48: 7,337,626 km (0.109 R)
- M49: 7,582,218 km (0.092 R)
- M50: 7,751,264 km (0.054 R)
- M51: 7,816,489 km (0.1 R)
- M52: 7,987,180 km (0.11 R)
- M53: 8,145,903 km (0.117 R)
- M54: 8,225,639 km (0.08 R)
- M55: 8,305,524 km (0.09 R)
- M56: 8,493,270 km (0.103 R)
- M57: 8,695,825 km (0.101 R)
- M58: 8,859,186 km (0.119 R)
- M59: 8,941,166 km (0.098 R)
- M60: 9,009,681 km (0.112 R)
- M61: 9,355,103 km (0.098 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.33 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 276.3
Radius: 8.1
Gravity: 4.21 G
Time & Orbit
Eccentricity (e): 0.048
Orbit Range: 1.27 AU - 1.39 AU
Year: 1023 Days
Day: 7.7 Hours
Environment
Temp: -194 °C
Axial Tilt: 29.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 50,716,778 km
- M1: 199,414 km (0.115 R)
- M2: 257,757 km (0.102 R)
- M3: 368,310 km (0.084 R)
- M4: 438,621 km (0.033 R)
- M5: 501,153 km (0.097 R)
- M6: 571,763 km (0.115 R)
- M7: 636,539 km (0.098 R)
- M8: 689,497 km (0.103 R)
- M9: 1,005,298 km (0.047 R)
- M10: 1,056,311 km (0.101 R)
- M11: 1,155,494 km (0.053 R)
- M12: 1,270,086 km (0.068 R)
- M13: 1,369,569 km (0.107 R)
- M14: 1,549,984 km (0.076 R)
- M15: 1,616,405 km (0.086 R)
- M16: 1,704,219 km (0.099 R)
- M17: 1,758,972 km (0.094 R)
- M18: 1,891,515 km (0.027 R)
- M19: 2,144,635 km (0.112 R)
- M20: 2,211,505 km (0.091 R)
- M21: 2,301,713 km (0.098 R)
- M22: 2,377,858 km (0.069 R)
- M23: 2,462,680 km (0.118 R)
- M24: 2,787,457 km (0.051 R)
- M25: 2,918,056 km (0.102 R)
- M26: 3,142,902 km (0.119 R)
- M27: 3,202,142 km (0.117 R)
- M28: 3,295,940 km (0.095 R)
- M29: 3,434,169 km (0.027 R)
- M30: 3,636,126 km (0.088 R)
- M31: 3,761,040 km (0.051 R)
- M32: 3,841,973 km (0.072 R)
- M33: 3,896,426 km (0.077 R)
- M34: 4,033,458 km (0.038 R)
- M35: 4,088,659 km (0.115 R)
- M36: 4,274,759 km (0.077 R)
- M37: 4,349,857 km (0.086 R)
- M38: 4,549,421 km (0.03 R)
- M39: 4,742,253 km (0.035 R)
- M40: 4,820,193 km (0.028 R)
- M41: 4,878,835 km (0.049 R)
- M42: 5,056,408 km (0.086 R)
- M43: 5,246,248 km (0.051 R)
- M44: 5,316,708 km (0.101 R)
- M45: 5,622,486 km (0.113 R)
- M46: 5,767,148 km (0.086 R)
- M47: 5,881,739 km (0.119 R)
- M48: 5,933,949 km (0.114 R)
- M49: 6,123,639 km (0.112 R)
- M50: 6,304,653 km (0.096 R)
- M51: 6,639,154 km (0.091 R)
- M52: 6,748,210 km (0.035 R)
- M53: 6,814,033 km (0.101 R)
- M54: 7,057,130 km (0.114 R)
- M55: 7,146,141 km (0.106 R)
- M56: 7,415,716 km (0.09 R)
- M57: 7,506,223 km (0.119 R)
- M58: 7,654,325 km (0.112 R)
- M59: 7,711,471 km (0.118 R)
Planet 3 - Gas Giant
Semi-Major Axis: 2.43 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 837.1
Radius: 9.7
Gravity: 8.9 G
Time & Orbit
Eccentricity (e): 0.018
Orbit Range: 2.39 AU - 2.47 AU
Year: 2526 Days
Day: 5.5 Hours
Environment
Temp: -203 °C
Axial Tilt: 19.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 50,716,778 km
- M1: 144,063 km (0.062 R)
- M2: 302,188 km (0.088 R)
- M3: 369,058 km (0.094 R)
- M4: 522,097 km (0.109 R)
- M5: 764,445 km (0.056 R)
- M6: 833,111 km (0.119 R)
- M7: 924,964 km (0.053 R)
- M8: 1,052,870 km (0.081 R)
- M9: 1,232,986 km (0.113 R)
- M10: 1,327,083 km (0.115 R)
- M11: 1,435,691 km (0.084 R)
- M12: 1,535,024 km (0.095 R)
- M13: 1,701,227 km (0.12 R)
- M14: 1,846,636 km (0.119 R)
- M15: 1,941,481 km (0.104 R)
- M16: 2,065,797 km (0.061 R)
- M17: 2,634,867 km (0.115 R)
- M18: 2,726,571 km (0.054 R)
- M19: 2,835,029 km (0.107 R)
- M20: 2,929,276 km (0.101 R)
- M21: 2,992,556 km (0.071 R)
- M22: 3,104,605 km (0.055 R)
- M23: 3,185,387 km (0.11 R)
- M24: 3,316,286 km (0.06 R)
- M25: 3,448,979 km (0.082 R)
- M26: 3,771,213 km (0.119 R)
- M27: 3,840,327 km (0.066 R)
- M28: 4,085,518 km (0.079 R)
- M29: 4,263,839 km (0.112 R)
- M30: 4,335,945 km (0.061 R)
- M31: 4,851,758 km (0.101 R)
- M32: 4,983,703 km (0.114 R)
- M33: 5,232,186 km (0.11 R)
- M34: 5,800,807 km (0.11 R)
- M35: 6,534,136 km (0.093 R)
- M36: 7,017,935 km (0.045 R)
- M37: 7,145,991 km (0.12 R)
- M38: 7,361,262 km (0.106 R)
- M39: 7,820,378 km (0.091 R)
- M40: 9,020,004 km (0.118 R)
- M41: 9,205,954 km (0.042 R)
- M42: 9,652,952 km (0.092 R)
- M43: 10,058,811 km (0.119 R)
- M44: 10,421,736 km (0.066 R)
- M45: 10,616,961 km (0.095 R)
- M46: 10,862,750 km (0.067 R)
- M47: 10,936,951 km (0.07 R)
- M48: 11,235,099 km (0.094 R)
- M49: 11,335,031 km (0.105 R)
- M50: 11,510,659 km (0.048 R)
- M51: 11,839,325 km (0.052 R)
- M52: 12,017,646 km (0.11 R)
- M53: 12,222,445 km (0.071 R)
- M54: 12,351,099 km (0.096 R)
- M55: 12,687,545 km (0.06 R)
- M56: 12,765,635 km (0.05 R)
- M57: 12,922,264 km (0.098 R)
- M58: 13,184,808 km (0.101 R)
- M59: 13,369,562 km (0.097 R)
- M60: 13,528,734 km (0.117 R)
- M61: 13,635,098 km (0.053 R)
- M62: 14,144,329 km (0.115 R)
- M63: 14,933,757 km (0.111 R)
- M64: 15,126,439 km (0.086 R)
- M65: 15,347,545 km (0.101 R)
- M66: 15,597,672 km (0.071 R)
- M67: 16,073,992 km (0.096 R)
- M68: 16,214,913 km (0.08 R)
- M69: 16,782,936 km (0.117 R)
- M70: 17,444,159 km (0.083 R)
- M71: 17,909,259 km (0.083 R)
- M72: 18,231,343 km (0.065 R)
- M73: 18,466,810 km (0.049 R)
- M74: 18,614,463 km (0.119 R)
- M75: 18,762,565 km (0.109 R)
- M76: 19,119,505 km (0.07 R)
- M77: 20,021,730 km (0.086 R)
- M78: 20,386,450 km (0.052 R)
- M79: 20,478,004 km (0.077 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.67 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 322.5
Radius: 8.5
Gravity: 4.46 G
Time & Orbit
Eccentricity (e): 0.111
Orbit Range: 2.37 AU - 2.97 AU
Year: 2909 Days
Day: 14.6 Hours
Environment
Temp: -208 °C
Axial Tilt: 3.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (77)
Outer Limit: 50,716,778 km
- M1: 111,450 km (0.071 R)
- M2: 173,833 km (0.064 R)
- M3: 261,048 km (0.077 R)
- M4: 369,058 km (0.113 R)
- M5: 501,751 km (0.109 R)
- M6: 597,195 km (0.116 R)
- M7: 683,064 km (0.102 R)
- M8: 903,571 km (0.116 R)
- M9: 1,060,200 km (0.106 R)
- M10: 1,127,370 km (0.118 R)
- M11: 1,186,012 km (0.076 R)
- M12: 1,256,024 km (0.106 R)
- M13: 1,368,671 km (0.111 R)
- M14: 1,772,884 km (0.097 R)
- M15: 1,841,849 km (0.062 R)
- M16: 2,200,285 km (0.097 R)
- M17: 2,375,165 km (0.078 R)
- M18: 2,477,191 km (0.112 R)
- M19: 2,751,853 km (0.08 R)
- M20: 2,886,192 km (0.107 R)
- M21: 2,995,249 km (0.039 R)
- M22: 3,077,976 km (0.109 R)
- M23: 3,133,477 km (0.116 R)
- M24: 3,473,962 km (0.082 R)
- M25: 3,663,353 km (0.039 R)
- M26: 3,766,725 km (0.094 R)
- M27: 3,826,265 km (0.1 R)
- M28: 4,190,087 km (0.073 R)
- M29: 4,470,284 km (0.11 R)
- M30: 4,564,979 km (0.054 R)
- M31: 4,724,450 km (0.113 R)
- M32: 4,869,560 km (0.089 R)
- M33: 5,065,234 km (0.06 R)
- M34: 5,213,785 km (0.047 R)
- M35: 5,397,342 km (0.062 R)
- M36: 5,515,225 km (0.087 R)
- M37: 5,770,738 km (0.087 R)
- M38: 6,152,661 km (0.027 R)
- M39: 6,311,235 km (0.104 R)
- M40: 6,399,947 km (0.084 R)
- M41: 6,453,353 km (0.113 R)
- M42: 7,050,697 km (0.119 R)
- M43: 7,124,299 km (0.104 R)
- M44: 7,290,951 km (0.1 R)
- M45: 7,477,500 km (0.114 R)
- M46: 7,571,447 km (0.078 R)
- M47: 7,665,694 km (0.034 R)
- M48: 7,912,830 km (0.076 R)
- M49: 8,847,517 km (0.07 R)
- M50: 9,046,632 km (0.04 R)
- M51: 9,146,713 km (0.1 R)
- M52: 9,307,680 km (0.071 R)
- M53: 9,408,808 km (0.048 R)
- M54: 10,692,358 km (0.108 R)
- M55: 10,862,002 km (0.026 R)
- M56: 10,925,731 km (0.093 R)
- M57: 11,225,375 km (0.065 R)
- M58: 11,311,394 km (0.059 R)
- M59: 11,570,947 km (0.06 R)
- M60: 11,679,704 km (0.104 R)
- M61: 11,832,593 km (0.089 R)
- M62: 11,920,258 km (0.111 R)
- M63: 12,584,173 km (0.109 R)
- M64: 13,078,893 km (0.108 R)
- M65: 13,442,565 km (0.094 R)
- M66: 13,648,711 km (0.078 R)
- M67: 13,740,564 km (0.108 R)
- M68: 13,832,717 km (0.054 R)
- M69: 14,110,370 km (0.062 R)
- M70: 14,765,310 km (0.106 R)
- M71: 14,883,193 km (0.115 R)
- M72: 14,977,888 km (0.09 R)
- M73: 15,215,300 km (0.026 R)
- M74: 15,525,865 km (0.1 R)
- M75: 15,717,949 km (0.109 R)
- M76: 15,959,250 km (0.115 R)
- M77: 16,201,898 km (0.063 R)
Planet 5 - Gas Giant
Semi-Major Axis: 4.09 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 304.5
Radius: 13.9
Gravity: 1.58 G
Time & Orbit
Eccentricity (e): 0.144
Orbit Range: 3.5 AU - 4.68 AU
Year: 5516 Days
Day: 7.9 Hours
Environment
Temp: -229 °C
Axial Tilt: 27.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 50,716,778 km
- M1: 258,056 km (0.116 R)
- M2: 445,951 km (0.11 R)
- M3: 606,021 km (0.062 R)
- M4: 746,493 km (0.044 R)
- M5: 980,464 km (0.107 R)
- M6: 1,606,382 km (0.104 R)
- M7: 1,721,871 km (0.094 R)
- M8: 1,900,491 km (0.104 R)
- M9: 2,148,525 km (0.097 R)
- M10: 2,325,349 km (0.114 R)
- M11: 2,423,934 km (0.086 R)
- M12: 2,711,162 km (0.04 R)
- M13: 2,920,599 km (0.112 R)
- M14: 3,063,316 km (0.067 R)
- M15: 3,676,966 km (0.119 R)
- M16: 4,047,670 km (0.117 R)
- M17: 4,595,347 km (0.077 R)
- M18: 4,699,468 km (0.115 R)
- M19: 5,450,000 km (0.071 R)
- M20: 6,469,809 km (0.086 R)
- M21: 7,230,663 km (0.104 R)
- M22: 7,474,358 km (0.115 R)
- M23: 7,671,229 km (0.096 R)
- M24: 7,770,263 km (0.107 R)
- M25: 8,045,074 km (0.103 R)
- M26: 8,578,540 km (0.095 R)
- M27: 8,733,075 km (0.118 R)
- M28: 8,940,567 km (0.108 R)
- M29: 9,097,196 km (0.116 R)
- M30: 9,334,010 km (0.047 R)
- M31: 9,867,625 km (0.087 R)
- M32: 10,192,552 km (0.075 R)
- M33: 10,466,017 km (0.069 R)
- M34: 10,908,826 km (0.115 R)
- M35: 11,470,716 km (0.086 R)
- M36: 11,641,258 km (0.097 R)
- M37: 11,783,974 km (0.09 R)
- M38: 12,652,390 km (0.117 R)
- M39: 12,917,028 km (0.072 R)
- M40: 13,124,072 km (0.099 R)
- M41: 13,993,534 km (0.079 R)
- M42: 15,192,262 km (0.111 R)
- M43: 16,583,971 km (0.049 R)
- M44: 16,680,462 km (0.116 R)
- M45: 17,197,622 km (0.03 R)
- M46: 17,458,221 km (0.036 R)
- M47: 17,556,208 km (0.058 R)
- M48: 17,917,337 km (0.094 R)
- M49: 18,713,796 km (0.114 R)
- M50: 19,015,385 km (0.117 R)
- M51: 19,827,702 km (0.12 R)
- M52: 20,651,388 km (0.098 R)
- M53: 20,893,736 km (0.066 R)
- M54: 21,102,276 km (0.057 R)
- M55: 21,661,622 km (0.113 R)
- M56: 21,767,089 km (0.06 R)
- M57: 23,189,016 km (0.075 R)
- M58: 23,693,760 km (0.074 R)
- M59: 24,092,887 km (0.1 R)
Planet 6 - Ice Giant
Semi-Major Axis: 6.88 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 560.3
Radius: 7.7
Gravity: 9.45 G
Time & Orbit
Eccentricity (e): 0.101
Orbit Range: 6.19 AU - 7.57 AU
Year: 12034 Days
Day: 21.3 Hours
Environment
Temp: -221 °C
Axial Tilt: 35 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 50,716,778 km
- M1: 125,363 km (0.117 R)
- M2: 283,937 km (0.117 R)
- M3: 531,521 km (0.087 R)
- M4: 595,250 km (0.092 R)
- M5: 661,671 km (0.058 R)
- M6: 1,328,130 km (0.108 R)
- M7: 1,508,395 km (0.118 R)
- M8: 2,747,514 km (0.1 R)
- M9: 2,804,511 km (0.095 R)
- M10: 3,184,789 km (0.058 R)
- M11: 3,675,320 km (0.109 R)
- M12: 4,222,101 km (0.072 R)
- M13: 5,036,960 km (0.11 R)
- M14: 6,499,429 km (0.114 R)
- M15: 6,884,344 km (0.115 R)
- M16: 7,515,647 km (0.037 R)
- M17: 8,372,095 km (0.113 R)
- M18: 9,130,556 km (0.094 R)
- M19: 10,043,103 km (0.112 R)
- M20: 10,309,088 km (0.04 R)
- M21: 10,398,249 km (0.028 R)
- M22: 10,532,588 km (0.103 R)
- M23: 10,802,911 km (0.098 R)
- M24: 10,984,373 km (0.069 R)
- M25: 11,488,668 km (0.108 R)
- M26: 11,627,495 km (0.115 R)
- M27: 11,860,119 km (0.079 R)
- M28: 11,953,618 km (0.037 R)
- M29: 12,567,268 km (0.079 R)
- M30: 13,046,281 km (0.077 R)
- M31: 13,776,019 km (0.072 R)
- M32: 15,478,742 km (0.116 R)
- M33: 15,940,401 km (0.063 R)
- M34: 16,095,385 km (0.037 R)
- M35: 16,667,596 km (0.107 R)
- M36: 17,671,847 km (0.046 R)
- M37: 17,885,772 km (0.089 R)
- M38: 18,370,170 km (0.108 R)
- M39: 19,462,085 km (0.076 R)
- M40: 19,849,244 km (0.116 R)
- M41: 20,071,546 km (0.102 R)
- M42: 20,182,997 km (0.103 R)
- M43: 20,912,735 km (0.103 R)
- M44: 20,969,283 km (0.09 R)
- M45: 22,282,603 km (0.055 R)
- M46: 22,397,943 km (0.096 R)
- M47: 22,978,233 km (0.107 R)
- M48: 23,036,576 km (0.1 R)
- M49: 23,094,919 km (0.104 R)
- M50: 23,739,985 km (0.111 R)
- M51: 24,928,092 km (0.072 R)
- M52: 25,348,462 km (0.097 R)
- M53: 26,013,723 km (0.111 R)
- M54: 26,074,460 km (0.108 R)
- M55: 26,196,233 km (0.1 R)
- M56: 26,440,077 km (0.094 R)
- M57: 26,868,825 km (0.091 R)
- M58: 29,299,042 km (0.037 R)
- M59: 29,425,452 km (0.037 R)
- M60: 29,488,882 km (0.109 R)
- M61: 30,508,242 km (0.07 R)
- M62: 30,636,447 km (0.092 R)
- M63: 31,280,316 km (0.116 R)
- M64: 31,409,569 km (0.091 R)
- M65: 34,365,623 km (0.082 R)
- M66: 34,833,415 km (0.102 R)
- M67: 35,842,902 km (0.112 R)
- M68: 37,546,522 km (0.101 R)
- M69: 37,752,818 km (0.031 R)
- M70: 38,858,945 km (0.069 R)
- M71: 40,116,015 km (0.109 R)
- M72: 41,032,302 km (0.043 R)
- M73: 41,103,062 km (0.104 R)
- M74: 41,244,582 km (0.111 R)
- M75: 41,457,460 km (0.081 R)
- M76: 41,599,428 km (0.071 R)
- M77: 42,097,888 km (0.117 R)
- M78: 42,240,754 km (0.032 R)
- M79: 44,184,030 km (0.08 R)
- M80: 44,401,695 km (0.088 R)
- M81: 44,547,104 km (0.103 R)
- M82: 44,911,226 km (0.112 R)
- M83: 45,276,244 km (0.1 R)
- M84: 45,715,613 km (0.052 R)
- M85: 45,935,821 km (0.11 R)
- M86: 47,784,552 km (0.044 R)
- M87: 48,008,051 km (0.115 R)
- M88: 48,082,551 km (0.108 R)
- M89: 48,381,298 km (0.034 R)
- M90: 49,280,979 km (0.116 R)
- M91: 49,883,859 km (0.115 R)
- M92: 50,110,500 km (0.049 R)
Kuiper Belt
Range: 30 - 45 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 394 - 10,762 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.