Star System Generated (Seed: 1766009128)
Star Details
Spectral Class: M1V
Temperature: 3,483 K
Mass: 0.32 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.3 AU
Planetary System (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.54 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.89
Radius: 0.95
Gravity: 0.99 G
Time & Orbit
Eccentricity (e): 0.149
Orbit Range: 0.46 AU - 0.62 AU
Year: 256 Days
Day: 15.8 Hours
Environment
Temp: -112 °C
Axial Tilt: 26.8 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 2 - Gas Giant
Semi-Major Axis: 2.03 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 504.3
Radius: 13.8
Gravity: 2.65 G
Time & Orbit
Eccentricity (e): 0.11
Orbit Range: 1.81 AU - 2.25 AU
Year: 1867 Days
Day: 6.6 Hours
Environment
Temp: -185 °C
Axial Tilt: 29.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (66)
Outer Limit: 52,077,823 km
- M1: 185,651 km (0.088 R)
- M2: 305,030 km (0.065 R)
- M3: 452,833 km (0.054 R)
- M4: 606,769 km (0.109 R)
- M5: 759,508 km (0.087 R)
- M6: 849,118 km (0.074 R)
- M7: 983,157 km (0.11 R)
- M8: 1,116,449 km (0.081 R)
- M9: 1,238,371 km (0.098 R)
- M10: 1,365,230 km (0.112 R)
- M11: 1,652,608 km (0.117 R)
- M12: 1,834,668 km (0.118 R)
- M13: 2,002,218 km (0.089 R)
- M14: 2,142,391 km (0.12 R)
- M15: 2,467,018 km (0.107 R)
- M16: 2,570,989 km (0.111 R)
- M17: 2,759,782 km (0.087 R)
- M18: 3,026,963 km (0.087 R)
- M19: 3,214,110 km (0.081 R)
- M20: 3,508,668 km (0.079 R)
- M21: 3,600,073 km (0.117 R)
- M22: 3,838,981 km (0.1 R)
- M23: 4,041,985 km (0.07 R)
- M24: 4,138,027 km (0.081 R)
- M25: 4,360,329 km (0.11 R)
- M26: 4,515,612 km (0.096 R)
- M27: 4,615,394 km (0.069 R)
- M28: 4,889,906 km (0.043 R)
- M29: 5,007,041 km (0.114 R)
- M30: 5,289,332 km (0.09 R)
- M31: 5,455,086 km (0.118 R)
- M32: 5,638,045 km (0.079 R)
- M33: 6,183,030 km (0.063 R)
- M34: 6,389,923 km (0.044 R)
- M35: 6,582,905 km (0.088 R)
- M36: 6,696,300 km (0.104 R)
- M37: 6,810,443 km (0.095 R)
- M38: 6,991,157 km (0.033 R)
- M39: 7,240,238 km (0.106 R)
- M40: 7,542,874 km (0.112 R)
- M41: 7,781,184 km (0.115 R)
- M42: 7,952,922 km (0.063 R)
- M43: 8,247,779 km (0.062 R)
- M44: 8,352,797 km (0.098 R)
- M45: 8,617,137 km (0.076 R)
- M46: 8,884,318 km (0.096 R)
- M47: 9,118,140 km (0.058 R)
- M48: 9,262,951 km (0.048 R)
- M49: 9,445,161 km (0.097 R)
- M50: 10,092,172 km (0.097 R)
- M51: 10,185,820 km (0.092 R)
- M52: 10,392,863 km (0.094 R)
- M53: 10,849,286 km (0.065 R)
- M54: 10,945,328 km (0.071 R)
- M55: 11,118,712 km (0.083 R)
- M56: 11,215,352 km (0.093 R)
- M57: 11,468,322 km (0.068 R)
- M58: 11,703,341 km (0.053 R)
- M59: 11,860,867 km (0.115 R)
- M60: 12,098,728 km (0.103 R)
- M61: 12,418,119 km (0.046 R)
- M62: 12,578,937 km (0.057 R)
- M63: 13,045,084 km (0.083 R)
- M64: 13,352,059 km (0.102 R)
- M65: 13,682,371 km (0.087 R)
- M66: 13,994,282 km (0.101 R)
Planet 3 - Gas Giant
Semi-Major Axis: 2.17 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 891.8
Radius: 14.9
Gravity: 4.02 G
Time & Orbit
Eccentricity (e): 0.241
Orbit Range: 1.65 AU - 2.69 AU
Year: 2064 Days
Day: 14.4 Hours
Environment
Temp: -199 °C
Axial Tilt: 23.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (67)
Outer Limit: 52,077,823 km
- M1: 209,138 km (0.08 R)
- M2: 381,624 km (0.089 R)
- M3: 602,431 km (0.032 R)
- M4: 818,600 km (0.073 R)
- M5: 1,112,859 km (0.066 R)
- M6: 1,257,520 km (0.074 R)
- M7: 1,683,874 km (0.046 R)
- M8: 1,852,470 km (0.1 R)
- M9: 2,039,767 km (0.119 R)
- M10: 2,155,107 km (0.113 R)
- M11: 2,392,968 km (0.103 R)
- M12: 2,611,829 km (0.076 R)
- M13: 2,866,146 km (0.05 R)
- M14: 2,996,445 km (0.031 R)
- M15: 3,368,944 km (0.087 R)
- M16: 3,491,465 km (0.095 R)
- M17: 3,964,044 km (0.113 R)
- M18: 4,126,208 km (0.114 R)
- M19: 4,307,222 km (0.093 R)
- M20: 4,440,514 km (0.071 R)
- M21: 4,660,123 km (0.089 R)
- M22: 5,110,413 km (0.069 R)
- M23: 5,412,451 km (0.092 R)
- M24: 5,738,574 km (0.062 R)
- M25: 5,904,179 km (0.11 R)
- M26: 6,052,730 km (0.086 R)
- M27: 6,334,722 km (0.084 R)
- M28: 6,717,393 km (0.111 R)
- M29: 7,048,603 km (0.075 R)
- M30: 7,226,176 km (0.096 R)
- M31: 7,465,383 km (0.032 R)
- M32: 7,565,763 km (0.109 R)
- M33: 7,788,215 km (0.109 R)
- M34: 8,012,911 km (0.108 R)
- M35: 8,364,466 km (0.118 R)
- M36: 8,763,443 km (0.08 R)
- M37: 9,061,442 km (0.108 R)
- M38: 9,492,882 km (0.119 R)
- M39: 9,887,073 km (0.043 R)
- M40: 10,130,618 km (0.056 R)
- M41: 10,353,818 km (0.112 R)
- M42: 10,714,349 km (0.05 R)
- M43: 11,010,254 km (0.099 R)
- M44: 11,680,153 km (0.066 R)
- M45: 12,126,254 km (0.092 R)
- M46: 12,315,794 km (0.094 R)
- M47: 12,410,939 km (0.094 R)
- M48: 12,601,975 km (0.088 R)
- M49: 12,721,953 km (0.109 R)
- M50: 12,842,229 km (0.076 R)
- M51: 13,083,830 km (0.065 R)
- M52: 13,253,923 km (0.08 R)
- M53: 13,351,460 km (0.096 R)
- M54: 13,694,787 km (0.057 R)
- M55: 13,941,774 km (0.097 R)
- M56: 14,040,957 km (0.093 R)
- M57: 14,515,332 km (0.095 R)
- M58: 14,615,862 km (0.104 R)
- M59: 15,480,088 km (0.118 R)
- M60: 15,892,530 km (0.079 R)
- M61: 16,100,172 km (0.095 R)
- M62: 16,360,921 km (0.098 R)
- M63: 17,178,174 km (0.111 R)
- M64: 17,337,795 km (0.074 R)
- M65: 17,498,014 km (0.093 R)
- M66: 17,954,736 km (0.074 R)
- M67: 18,143,828 km (0.07 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.38 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 65.4
Radius: 8.4
Gravity: 0.93 G
Time & Orbit
Eccentricity (e): 0.007
Orbit Range: 2.36 AU - 2.4 AU
Year: 2371 Days
Day: 10.4 Hours
Environment
Temp: -205 °C
Axial Tilt: 2.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (49)
Outer Limit: 52,077,823 km
- M1: 129,701 km (0.094 R)
- M2: 183,557 km (0.091 R)
- M3: 302,636 km (0.112 R)
- M4: 366,515 km (0.114 R)
- M5: 448,943 km (0.117 R)
- M6: 557,252 km (0.062 R)
- M7: 634,893 km (0.114 R)
- M8: 801,695 km (0.087 R)
- M9: 862,432 km (0.091 R)
- M10: 965,505 km (0.096 R)
- M11: 1,024,596 km (0.085 R)
- M12: 1,078,900 km (0.09 R)
- M13: 1,438,982 km (0.106 R)
- M14: 1,534,874 km (0.057 R)
- M15: 1,740,122 km (0.082 R)
- M16: 1,827,787 km (0.094 R)
- M17: 1,909,467 km (0.054 R)
- M18: 2,045,751 km (0.08 R)
- M19: 2,122,794 km (0.093 R)
- M20: 2,400,597 km (0.077 R)
- M21: 2,564,556 km (0.071 R)
- M22: 2,689,919 km (0.056 R)
- M23: 2,791,795 km (0.077 R)
- M24: 2,868,988 km (0.088 R)
- M25: 3,203,040 km (0.083 R)
- M26: 3,292,948 km (0.05 R)
- M27: 3,374,778 km (0.048 R)
- M28: 3,822,076 km (0.103 R)
- M29: 3,955,966 km (0.117 R)
- M30: 4,101,375 km (0.07 R)
- M31: 4,189,339 km (0.1 R)
- M32: 4,487,487 km (0.105 R)
- M33: 4,885,418 km (0.088 R)
- M34: 5,156,938 km (0.058 R)
- M35: 5,326,432 km (0.091 R)
- M36: 5,813,373 km (0.106 R)
- M37: 5,978,829 km (0.069 R)
- M38: 6,067,690 km (0.044 R)
- M39: 6,157,000 km (0.032 R)
- M40: 6,280,567 km (0.104 R)
- M41: 6,438,992 km (0.117 R)
- M42: 6,541,616 km (0.071 R)
- M43: 6,736,841 km (0.066 R)
- M44: 6,922,342 km (0.061 R)
- M45: 7,039,178 km (0.107 R)
- M46: 7,097,821 km (0.09 R)
- M47: 7,381,608 km (0.058 R)
- M48: 7,560,976 km (0.108 R)
- M49: 7,669,135 km (0.074 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.95 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 402.2
Radius: 14.1
Gravity: 2.02 G
Time & Orbit
Eccentricity (e): 0.228
Orbit Range: 2.28 AU - 3.62 AU
Year: 3272 Days
Day: 6.2 Hours
Environment
Temp: -201 °C
Axial Tilt: 33.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (60)
Outer Limit: 52,077,823 km
- M1: 213,626 km (0.105 R)
- M2: 392,844 km (0.073 R)
- M3: 781,350 km (0.078 R)
- M4: 921,373 km (0.101 R)
- M5: 1,143,227 km (0.112 R)
- M6: 1,239,568 km (0.056 R)
- M7: 1,327,532 km (0.089 R)
- M8: 1,475,484 km (0.061 R)
- M9: 1,581,399 km (0.111 R)
- M10: 1,726,808 km (0.054 R)
- M11: 1,927,868 km (0.045 R)
- M12: 2,177,098 km (0.093 R)
- M13: 2,479,136 km (0.076 R)
- M14: 2,578,170 km (0.028 R)
- M15: 2,839,068 km (0.114 R)
- M16: 2,928,079 km (0.12 R)
- M17: 3,277,839 km (0.11 R)
- M18: 3,434,318 km (0.102 R)
- M19: 3,673,675 km (0.102 R)
- M20: 4,253,666 km (0.045 R)
- M21: 4,493,920 km (0.104 R)
- M22: 4,703,507 km (0.102 R)
- M23: 5,096,051 km (0.059 R)
- M24: 5,296,363 km (0.099 R)
- M25: 5,592,417 km (0.096 R)
- M26: 5,761,463 km (0.057 R)
- M27: 6,027,747 km (0.088 R)
- M28: 7,092,734 km (0.033 R)
- M29: 7,296,337 km (0.088 R)
- M30: 7,440,101 km (0.117 R)
- M31: 7,646,994 km (0.107 R)
- M32: 7,813,946 km (0.046 R)
- M33: 8,343,672 km (0.109 R)
- M34: 8,623,569 km (0.12 R)
- M35: 8,732,177 km (0.063 R)
- M36: 8,863,075 km (0.101 R)
- M37: 9,126,667 km (0.112 R)
- M38: 9,504,701 km (0.05 R)
- M39: 9,887,970 km (0.09 R)
- M40: 11,162,544 km (0.091 R)
- M41: 11,662,800 km (0.1 R)
- M42: 12,341,226 km (0.101 R)
- M43: 13,838,102 km (0.051 R)
- M44: 13,990,991 km (0.106 R)
- M45: 14,737,634 km (0.043 R)
- M46: 14,893,665 km (0.083 R)
- M47: 14,998,084 km (0.074 R)
- M48: 15,286,509 km (0.043 R)
- M49: 15,444,484 km (0.052 R)
- M50: 15,576,579 km (0.072 R)
- M51: 15,788,858 km (0.104 R)
- M52: 16,001,886 km (0.109 R)
- M53: 16,216,110 km (0.054 R)
- M54: 16,512,015 km (0.109 R)
- M55: 16,836,941 km (0.118 R)
- M56: 16,972,926 km (0.088 R)
- M57: 17,246,091 km (0.098 R)
- M58: 18,269,341 km (0.101 R)
- M59: 18,633,612 km (0.088 R)
- M60: 18,746,109 km (0.048 R)
Planet 6 - Gas Giant
Semi-Major Axis: 4.59 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 948.5
Radius: 8.2
Gravity: 14.11 G
Time & Orbit
Eccentricity (e): 0.032
Orbit Range: 4.44 AU - 4.74 AU
Year: 6349 Days
Day: 7.2 Hours
Environment
Temp: -208 °C
Axial Tilt: 27.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 52,077,823 km
- M1: 125,064 km (0.104 R)
- M2: 337,942 km (0.077 R)
- M3: 452,982 km (0.094 R)
- M4: 609,761 km (0.073 R)
- M5: 976,126 km (0.027 R)
- M6: 1,164,769 km (0.111 R)
- M7: 1,328,130 km (0.102 R)
- M8: 1,657,245 km (0.096 R)
- M9: 1,738,327 km (0.102 R)
- M10: 1,820,905 km (0.088 R)
- M11: 2,054,577 km (0.083 R)
- M12: 2,885,593 km (0.096 R)
- M13: 3,008,563 km (0.104 R)
- M14: 3,491,764 km (0.117 R)
- M15: 3,622,961 km (0.103 R)
- M16: 3,729,026 km (0.086 R)
- M17: 3,809,360 km (0.05 R)
- M18: 4,557,948 km (0.093 R)
- M19: 4,643,817 km (0.083 R)
- M20: 4,963,657 km (0.044 R)
- M21: 5,081,840 km (0.099 R)
- M22: 5,472,141 km (0.06 R)
- M23: 5,563,545 km (0.072 R)
- M24: 5,872,016 km (0.111 R)
- M25: 5,934,398 km (0.083 R)
- M26: 6,059,911 km (0.118 R)
- M27: 6,122,891 km (0.044 R)
- M28: 6,635,114 km (0.067 R)
- M29: 6,830,788 km (0.105 R)
- M30: 6,929,373 km (0.045 R)
- M31: 7,227,821 km (0.088 R)
- M32: 7,940,655 km (0.111 R)
- M33: 8,288,021 km (0.107 R)
- M34: 8,393,189 km (0.059 R)
- M35: 8,604,870 km (0.071 R)
- M36: 9,105,723 km (0.117 R)
- M37: 9,323,238 km (0.116 R)
- M38: 9,505,897 km (0.11 R)
- M39: 9,800,456 km (0.059 R)
- M40: 9,874,656 km (0.076 R)
- M41: 10,172,954 km (0.098 R)
- M42: 10,512,242 km (0.055 R)
- M43: 10,740,379 km (0.047 R)
- M44: 10,855,121 km (0.089 R)
- M45: 11,513,052 km (0.115 R)
- M46: 11,748,370 km (0.111 R)
- M47: 12,544,081 km (0.087 R)
- M48: 12,948,444 km (0.118 R)
- M49: 14,693,054 km (0.118 R)
- M50: 14,820,511 km (0.113 R)
- M51: 15,940,252 km (0.106 R)
- M52: 16,071,299 km (0.064 R)
- M53: 16,158,814 km (0.11 R)
- M54: 16,820,037 km (0.107 R)
- M55: 17,221,108 km (0.12 R)
- M56: 17,490,235 km (0.093 R)
- M57: 17,851,215 km (0.109 R)
- M58: 19,880,360 km (0.093 R)
- M59: 19,974,308 km (0.032 R)
- M60: 20,068,405 km (0.111 R)
- M61: 20,209,924 km (0.116 R)
- M62: 20,446,289 km (0.084 R)
- M63: 20,588,706 km (0.101 R)
- M64: 21,305,130 km (0.075 R)
- M65: 22,370,866 km (0.051 R)
- M66: 24,202,093 km (0.041 R)
- M67: 24,755,605 km (0.059 R)
- M68: 25,517,358 km (0.111 R)
- M69: 26,389,812 km (0.064 R)
- M70: 26,803,750 km (0.093 R)
- M71: 26,855,660 km (0.064 R)
- M72: 28,375,275 km (0.114 R)
- M73: 28,640,064 km (0.091 R)
- M74: 29,012,263 km (0.095 R)
- M75: 29,172,183 km (0.099 R)
- M76: 29,493,071 km (0.056 R)
- M77: 29,815,005 km (0.067 R)
- M78: 30,787,990 km (0.094 R)
- M79: 32,543,222 km (0.101 R)
- M80: 33,377,230 km (0.116 R)
- M81: 33,433,030 km (0.094 R)
- M82: 34,895,947 km (0.06 R)
- M83: 35,122,887 km (0.095 R)
- M84: 35,236,582 km (0.101 R)
- M85: 35,920,992 km (0.1 R)
- M86: 36,322,213 km (0.07 R)
- M87: 36,609,741 km (0.107 R)
- M88: 37,071,400 km (0.116 R)
- M89: 37,709,285 km (0.115 R)
- M90: 37,825,672 km (0.068 R)
- M91: 38,175,581 km (0.083 R)
- M92: 38,702,316 km (0.111 R)
- M93: 39,054,768 km (0.097 R)
- M94: 39,408,417 km (0.114 R)
Planet 7 - Ice Giant
Semi-Major Axis: 7.56 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 487.7
Radius: 4.9
Gravity: 20.31 G
Time & Orbit
Eccentricity (e): 0.039
Orbit Range: 7.27 AU - 7.85 AU
Year: 13421 Days
Day: 17.9 Hours
Environment
Temp: -230 °C
Axial Tilt: 5.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (78)
Outer Limit: 52,077,823 km
- M1: 62,532 km (0.119 R)
- M2: 129,253 km (0.087 R)
- M3: 331,210 km (0.092 R)
- M4: 461,509 km (0.115 R)
- M5: 806,333 km (0.087 R)
- M6: 1,108,071 km (0.094 R)
- M7: 1,932,804 km (0.086 R)
- M8: 2,036,775 km (0.077 R)
- M9: 2,142,690 km (0.076 R)
- M10: 2,499,032 km (0.112 R)
- M11: 2,669,873 km (0.092 R)
- M12: 2,933,016 km (0.097 R)
- M13: 3,327,805 km (0.048 R)
- M14: 3,610,844 km (0.116 R)
- M15: 3,771,512 km (0.067 R)
- M16: 4,818,547 km (0.083 R)
- M17: 4,889,008 km (0.08 R)
- M18: 5,030,976 km (0.117 R)
- M19: 5,282,750 km (0.05 R)
- M20: 5,501,910 km (0.093 R)
- M21: 5,911,210 km (0.116 R)
- M22: 6,100,601 km (0.117 R)
- M23: 6,446,322 km (0.117 R)
- M24: 7,521,482 km (0.118 R)
- M25: 7,644,302 km (0.102 R)
- M26: 7,809,158 km (0.065 R)
- M27: 8,184,350 km (0.109 R)
- M28: 8,310,760 km (0.097 R)
- M29: 8,650,946 km (0.071 R)
- M30: 8,779,749 km (0.095 R)
- M31: 9,300,948 km (0.052 R)
- M32: 9,966,659 km (0.029 R)
- M33: 10,418,893 km (0.091 R)
- M34: 10,877,860 km (0.064 R)
- M35: 11,720,544 km (0.092 R)
- M36: 11,815,539 km (0.116 R)
- M37: 11,862,962 km (0.045 R)
- M38: 11,958,255 km (0.087 R)
- M39: 12,006,127 km (0.113 R)
- M40: 12,245,782 km (0.092 R)
- M41: 14,830,535 km (0.076 R)
- M42: 14,933,308 km (0.104 R)
- M43: 15,815,636 km (0.1 R)
- M44: 15,973,013 km (0.025 R)
- M45: 17,793,620 km (0.1 R)
- M46: 17,848,073 km (0.103 R)
- M47: 19,229,460 km (0.078 R)
- M48: 19,961,293 km (0.108 R)
- M49: 20,074,688 km (0.12 R)
- M50: 20,188,233 km (0.093 R)
- M51: 20,302,077 km (0.091 R)
- M52: 21,917,883 km (0.055 R)
- M53: 22,387,022 km (0.082 R)
- M54: 23,814,335 km (0.107 R)
- M55: 24,965,042 km (0.076 R)
- M56: 25,087,264 km (0.109 R)
- M57: 26,257,867 km (0.102 R)
- M58: 27,257,330 km (0.08 R)
- M59: 28,907,844 km (0.087 R)
- M60: 30,852,167 km (0.084 R)
- M61: 31,575,623 km (0.07 R)
- M62: 32,637,917 km (0.068 R)
- M63: 34,729,146 km (0.111 R)
- M64: 34,933,796 km (0.116 R)
- M65: 35,138,894 km (0.098 R)
- M66: 35,344,292 km (0.095 R)
- M67: 36,516,242 km (0.108 R)
- M68: 36,793,746 km (0.102 R)
- M69: 38,121,726 km (0.089 R)
- M70: 38,403,419 km (0.1 R)
- M71: 40,393,669 km (0.086 R)
- M72: 41,618,427 km (0.084 R)
- M73: 42,199,016 km (0.078 R)
- M74: 43,074,762 km (0.081 R)
- M75: 43,661,934 km (0.078 R)
- M76: 44,325,699 km (0.111 R)
- M77: 45,141,606 km (0.099 R)
- M78: 46,637,585 km (0.076 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: 297 - 15,499 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.