Star System Generated (Seed: 1766666351)
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)
Asteroid Belt
Center: 0.56 AU
Composition
Type: Main (Rocky/Icy Mix)
A dense region of planetesimals and debris.
Boundary
Planet 1 - Gas Giant
Semi-Major Axis: 1.12 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 922.5
Radius: 13.4
Gravity: 5.14 G
Time & Orbit
Eccentricity (e): 0.234
Orbit Range: 0.86 AU - 1.38 AU
Year: 790 Days
Day: 6.3 Hours
Environment
Temp: -182 °C
Axial Tilt: 38 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 62,741,449 km
- M1: 184,305 km (0.063 R)
- M2: 273,764 km (0.038 R)
- M3: 363,523 km (0.113 R)
- M4: 460,612 km (0.074 R)
- M5: 626,217 km (0.097 R)
- M6: 751,430 km (0.076 R)
- M7: 1,036,564 km (0.039 R)
- M8: 1,237,474 km (0.057 R)
- M9: 1,481,318 km (0.113 R)
- M10: 1,571,226 km (0.077 R)
- M11: 1,678,638 km (0.058 R)
- M12: 1,852,620 km (0.105 R)
- M13: 1,991,447 km (0.07 R)
- M14: 2,167,823 km (0.095 R)
- M15: 2,332,081 km (0.099 R)
- M16: 2,728,516 km (0.118 R)
- M17: 2,821,565 km (0.079 R)
- M18: 2,953,810 km (0.112 R)
- M19: 3,156,216 km (0.072 R)
- M20: 3,503,881 km (0.094 R)
- M21: 3,605,458 km (0.084 R)
- M22: 3,863,963 km (0.065 R)
- M23: 4,043,331 km (0.097 R)
- M24: 4,214,621 km (0.026 R)
- M25: 4,312,009 km (0.078 R)
- M26: 4,531,320 km (0.104 R)
- M27: 4,631,251 km (0.097 R)
- M28: 4,912,794 km (0.105 R)
- M29: 5,130,459 km (0.045 R)
- M30: 5,339,746 km (0.028 R)
- M31: 5,457,181 km (0.096 R)
- M32: 5,551,727 km (0.109 R)
- M33: 5,706,710 km (0.108 R)
- M34: 5,911,509 km (0.113 R)
- M35: 6,106,585 km (0.09 R)
- M36: 6,254,238 km (0.086 R)
- M37: 6,528,002 km (0.078 R)
- M38: 6,628,682 km (0.116 R)
- M39: 6,717,094 km (0.113 R)
- M40: 6,844,103 km (0.062 R)
- M41: 6,933,413 km (0.06 R)
- M42: 7,087,648 km (0.052 R)
- M43: 7,294,991 km (0.114 R)
- M44: 7,412,574 km (0.088 R)
- M45: 7,956,064 km (0.095 R)
- M46: 8,171,634 km (0.048 R)
- M47: 8,293,706 km (0.04 R)
- M48: 8,416,526 km (0.089 R)
- M49: 8,802,339 km (0.057 R)
- M50: 8,983,502 km (0.117 R)
- M51: 9,081,488 km (0.055 R)
- M52: 9,278,658 km (0.106 R)
- M53: 9,434,539 km (0.104 R)
- M54: 9,519,960 km (0.102 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.59 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 607.5
Radius: 12.9
Gravity: 3.65 G
Time & Orbit
Eccentricity (e): 0.087
Orbit Range: 1.45 AU - 1.73 AU
Year: 1337 Days
Day: 11.8 Hours
Environment
Temp: -187 °C
Axial Tilt: 2.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (60)
Outer Limit: 62,741,449 km
- M1: 161,416 km (0.084 R)
- M2: 259,104 km (0.078 R)
- M3: 348,264 km (0.051 R)
- M4: 541,843 km (0.11 R)
- M5: 629,807 km (0.1 R)
- M6: 749,785 km (0.058 R)
- M7: 843,732 km (0.087 R)
- M8: 935,136 km (0.05 R)
- M9: 1,098,198 km (0.105 R)
- M10: 1,328,279 km (0.074 R)
- M11: 1,411,606 km (0.113 R)
- M12: 1,531,134 km (0.078 R)
- M13: 1,654,403 km (0.11 R)
- M14: 1,818,063 km (0.118 R)
- M15: 1,930,112 km (0.076 R)
- M16: 2,351,529 km (0.062 R)
- M17: 2,694,706 km (0.103 R)
- M18: 2,855,973 km (0.105 R)
- M19: 2,954,408 km (0.103 R)
- M20: 3,087,550 km (0.1 R)
- M21: 3,177,309 km (0.083 R)
- M22: 3,336,631 km (0.088 R)
- M23: 3,604,411 km (0.086 R)
- M24: 3,699,107 km (0.049 R)
- M25: 3,842,870 km (0.107 R)
- M26: 4,037,497 km (0.075 R)
- M27: 4,148,499 km (0.054 R)
- M28: 4,980,113 km (0.07 R)
- M29: 5,152,599 km (0.093 R)
- M30: 5,286,639 km (0.063 R)
- M31: 5,408,262 km (0.077 R)
- M32: 5,544,695 km (0.095 R)
- M33: 5,960,428 km (0.113 R)
- M34: 6,229,106 km (0.057 R)
- M35: 6,516,184 km (0.107 R)
- M36: 6,719,936 km (0.074 R)
- M37: 6,955,104 km (0.108 R)
- M38: 7,163,344 km (0.104 R)
- M39: 7,268,213 km (0.108 R)
- M40: 7,509,813 km (0.105 R)
- M41: 7,784,774 km (0.116 R)
- M42: 8,000,943 km (0.107 R)
- M43: 8,407,849 km (0.039 R)
- M44: 8,534,409 km (0.117 R)
- M45: 8,901,821 km (0.062 R)
- M46: 9,030,775 km (0.116 R)
- M47: 9,290,776 km (0.062 R)
- M48: 9,668,810 km (0.03 R)
- M49: 9,751,687 km (0.111 R)
- M50: 9,884,679 km (0.12 R)
- M51: 10,018,270 km (0.105 R)
- M52: 10,135,854 km (0.063 R)
- M53: 10,253,737 km (0.052 R)
- M54: 10,781,369 km (0.095 R)
- M55: 10,936,352 km (0.103 R)
- M56: 11,022,670 km (0.081 R)
- M57: 11,370,485 km (0.109 R)
- M58: 11,510,509 km (0.109 R)
- M59: 11,792,501 km (0.117 R)
- M60: 11,969,924 km (0.085 R)
Planet 3 - Gas Giant
Semi-Major Axis: 3.19 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 425.7
Radius: 11
Gravity: 3.52 G
Time & Orbit
Eccentricity (e): 0.048
Orbit Range: 3.04 AU - 3.34 AU
Year: 3799 Days
Day: 10 Hours
Environment
Temp: -219 °C
Axial Tilt: 170.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 62,741,449 km
- M1: 146,756 km (0.102 R)
- M2: 253,120 km (0.088 R)
- M3: 619,186 km (0.106 R)
- M4: 722,109 km (0.097 R)
- M5: 821,143 km (0.113 R)
- M6: 914,641 km (0.053 R)
- M7: 1,056,460 km (0.044 R)
- M8: 1,475,783 km (0.074 R)
- M9: 1,578,856 km (0.089 R)
- M10: 1,860,848 km (0.032 R)
- M11: 2,336,868 km (0.12 R)
- M12: 2,596,720 km (0.075 R)
- M13: 3,605,159 km (0.043 R)
- M14: 3,799,038 km (0.073 R)
- M15: 3,942,203 km (0.116 R)
- M16: 4,345,070 km (0.093 R)
- M17: 4,646,510 km (0.068 R)
- M18: 4,780,550 km (0.039 R)
- M19: 4,935,383 km (0.085 R)
- M20: 5,111,460 km (0.057 R)
- M21: 5,713,591 km (0.117 R)
- M22: 6,023,259 km (0.119 R)
- M23: 6,551,489 km (0.049 R)
- M24: 6,723,676 km (0.115 R)
- M25: 6,853,826 km (0.112 R)
- M26: 8,247,181 km (0.109 R)
- M27: 8,456,618 km (0.048 R)
- M28: 8,833,305 km (0.103 R)
- M29: 9,360,339 km (0.09 R)
- M30: 9,554,517 km (0.073 R)
- M31: 9,750,041 km (0.102 R)
- M32: 9,848,327 km (0.072 R)
- M33: 10,120,296 km (0.081 R)
- M34: 10,269,595 km (0.081 R)
- M35: 11,387,390 km (0.078 R)
- M36: 11,568,703 km (0.099 R)
- M37: 11,698,853 km (0.073 R)
- M38: 12,303,826 km (0.119 R)
- M39: 12,436,819 km (0.082 R)
- M40: 12,570,111 km (0.116 R)
- M41: 13,054,209 km (0.044 R)
- M42: 13,380,183 km (0.078 R)
- M43: 13,874,455 km (0.083 R)
- M44: 14,179,335 km (0.099 R)
- M45: 14,852,525 km (0.099 R)
- M46: 14,937,347 km (0.096 R)
- M47: 16,229,723 km (0.114 R)
- M48: 16,521,888 km (0.117 R)
- M49: 16,786,227 km (0.072 R)
- M50: 16,874,640 km (0.077 R)
- M51: 17,319,095 km (0.046 R)
- M52: 17,557,704 km (0.09 R)
- M53: 18,159,087 km (0.03 R)
- M54: 18,920,391 km (0.031 R)
- M55: 19,754,100 km (0.069 R)
- M56: 19,909,831 km (0.062 R)
- M57: 20,097,277 km (0.1 R)
- M58: 20,285,322 km (0.118 R)
- M59: 20,852,896 km (0.092 R)
Planet 4 - Gas Giant
Semi-Major Axis: 3.37 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 562.4
Radius: 8.1
Gravity: 8.57 G
Time & Orbit
Eccentricity (e): 0.149
Orbit Range: 2.87 AU - 3.87 AU
Year: 4125 Days
Day: 8.4 Hours
Environment
Temp: -211 °C
Axial Tilt: 12.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 62,741,449 km
- M1: 109,506 km (0.119 R)
- M2: 170,841 km (0.077 R)
- M3: 403,017 km (0.078 R)
- M4: 725,550 km (0.094 R)
- M5: 895,942 km (0.07 R)
- M6: 1,016,817 km (0.097 R)
- M7: 1,235,230 km (0.046 R)
- M8: 1,302,249 km (0.115 R)
- M9: 1,370,765 km (0.093 R)
- M10: 1,761,066 km (0.116 R)
- M11: 1,821,803 km (0.09 R)
- M12: 2,055,924 km (0.099 R)
- M13: 2,217,489 km (0.094 R)
- M14: 2,366,489 km (0.116 R)
- M15: 2,709,517 km (0.12 R)
- M16: 2,797,630 km (0.094 R)
- M17: 2,851,036 km (0.115 R)
- M18: 2,976,998 km (0.026 R)
- M19: 3,403,950 km (0.096 R)
- M20: 3,537,690 km (0.08 R)
- M21: 3,653,778 km (0.075 R)
- M22: 3,969,430 km (0.031 R)
- M23: 4,049,764 km (0.117 R)
- M24: 4,252,918 km (0.075 R)
- M25: 4,376,486 km (0.111 R)
- M26: 4,775,613 km (0.064 R)
- M27: 5,274,223 km (0.086 R)
- M28: 5,407,065 km (0.076 R)
- M29: 5,744,109 km (0.08 R)
- M30: 6,087,885 km (0.097 R)
- M31: 6,843,654 km (0.082 R)
- M32: 7,330,894 km (0.046 R)
- M33: 7,879,918 km (0.084 R)
- M34: 8,545,778 km (0.098 R)
- M35: 8,938,174 km (0.111 R)
- M36: 9,176,333 km (0.057 R)
- M37: 9,470,443 km (0.092 R)
- M38: 9,605,081 km (0.096 R)
- M39: 9,659,086 km (0.05 R)
- M40: 10,177,742 km (0.116 R)
- M41: 10,565,649 km (0.113 R)
- M42: 11,128,137 km (0.099 R)
- M43: 11,585,308 km (0.073 R)
- M44: 11,816,137 km (0.11 R)
- M45: 11,990,269 km (0.115 R)
- M46: 12,547,222 km (0.119 R)
- M47: 12,606,313 km (0.044 R)
- M48: 12,665,554 km (0.108 R)
- M49: 12,993,024 km (0.119 R)
- M50: 13,142,771 km (0.042 R)
- M51: 13,625,673 km (0.036 R)
- M52: 14,330,279 km (0.115 R)
- M53: 14,515,930 km (0.113 R)
- M54: 15,140,800 km (0.099 R)
- M55: 15,203,781 km (0.113 R)
- M56: 15,806,361 km (0.104 R)
- M57: 16,287,618 km (0.113 R)
- M58: 16,384,557 km (0.115 R)
- M59: 16,546,272 km (0.09 R)
- M60: 17,462,260 km (0.075 R)
- M61: 17,826,531 km (0.084 R)
- M62: 17,926,462 km (0.118 R)
- M63: 18,495,383 km (0.102 R)
- M64: 19,002,520 km (0.117 R)
- M65: 19,172,463 km (0.097 R)
- M66: 19,308,896 km (0.103 R)
- M67: 20,237,899 km (0.046 R)
- M68: 20,376,876 km (0.111 R)
- M69: 21,216,718 km (0.099 R)
- M70: 21,747,491 km (0.11 R)
- M71: 21,960,967 km (0.109 R)
- M72: 22,067,930 km (0.06 R)
- M73: 22,354,111 km (0.079 R)
- M74: 23,365,542 km (0.087 R)
- M75: 24,244,429 km (0.113 R)
- M76: 24,687,837 km (0.11 R)
Planet 5 - Gas Giant
Semi-Major Axis: 5.05 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 681
Radius: 8.3
Gravity: 9.89 G
Time & Orbit
Eccentricity (e): 0.134
Orbit Range: 4.37 AU - 5.73 AU
Year: 7568 Days
Day: 14.2 Hours
Environment
Temp: -214 °C
Axial Tilt: 3.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (87)
Outer Limit: 62,741,449 km
- M1: 117,285 km (0.043 R)
- M2: 309,069 km (0.083 R)
- M3: 444,306 km (0.06 R)
- M4: 1,190,949 km (0.114 R)
- M5: 1,451,399 km (0.069 R)
- M6: 1,709,455 km (0.106 R)
- M7: 1,854,415 km (0.091 R)
- M8: 2,201,183 km (0.056 R)
- M9: 2,313,681 km (0.051 R)
- M10: 2,591,783 km (0.088 R)
- M11: 3,256,297 km (0.098 R)
- M12: 3,333,190 km (0.092 R)
- M13: 3,515,251 km (0.086 R)
- M14: 3,567,909 km (0.092 R)
- M15: 3,700,603 km (0.101 R)
- M16: 3,971,075 km (0.078 R)
- M17: 4,304,080 km (0.107 R)
- M18: 4,908,456 km (0.107 R)
- M19: 5,265,845 km (0.083 R)
- M20: 5,478,124 km (0.064 R)
- M21: 5,755,329 km (0.104 R)
- M22: 5,974,041 km (0.116 R)
- M23: 6,227,460 km (0.058 R)
- M24: 7,683,347 km (0.102 R)
- M25: 7,924,349 km (0.062 R)
- M26: 8,519,898 km (0.097 R)
- M27: 9,057,403 km (0.077 R)
- M28: 9,679,880 km (0.114 R)
- M29: 10,202,874 km (0.11 R)
- M30: 10,429,814 km (0.113 R)
- M31: 10,505,810 km (0.056 R)
- M32: 10,734,994 km (0.03 R)
- M33: 10,927,227 km (0.08 R)
- M34: 11,198,298 km (0.096 R)
- M35: 11,393,374 km (0.11 R)
- M36: 11,628,841 km (0.071 R)
- M37: 12,184,597 km (0.091 R)
- M38: 12,344,966 km (0.077 R)
- M39: 12,425,300 km (0.087 R)
- M40: 12,830,261 km (0.096 R)
- M41: 12,952,483 km (0.073 R)
- M42: 13,819,552 km (0.118 R)
- M43: 14,070,727 km (0.12 R)
- M44: 15,004,517 km (0.111 R)
- M45: 15,090,386 km (0.092 R)
- M46: 15,478,892 km (0.047 R)
- M47: 16,133,682 km (0.114 R)
- M48: 16,708,586 km (0.091 R)
- M49: 16,797,597 km (0.068 R)
- M50: 16,886,907 km (0.102 R)
- M51: 17,155,435 km (0.103 R)
- M52: 18,519,169 km (0.048 R)
- M53: 18,935,051 km (0.117 R)
- M54: 19,260,726 km (0.087 R)
- M55: 19,400,749 km (0.083 R)
- M56: 19,635,020 km (0.089 R)
- M57: 19,917,461 km (0.102 R)
- M58: 20,772,712 km (0.069 R)
- M59: 20,964,346 km (0.115 R)
- M60: 21,397,731 km (0.081 R)
- M61: 22,420,682 km (0.082 R)
- M62: 22,913,307 km (0.039 R)
- M63: 24,362,013 km (0.106 R)
- M64: 25,891,801 km (0.083 R)
- M65: 26,720,274 km (0.109 R)
- M66: 27,137,802 km (0.115 R)
- M67: 27,715,399 km (0.096 R)
- M68: 28,989,674 km (0.088 R)
- M69: 29,365,015 km (0.072 R)
- M70: 29,526,281 km (0.098 R)
- M71: 31,540,018 km (0.095 R)
- M72: 31,650,122 km (0.068 R)
- M73: 32,368,940 km (0.101 R)
- M74: 32,869,794 km (0.072 R)
- M75: 33,373,191 km (0.104 R)
- M76: 33,935,529 km (0.103 R)
- M77: 33,991,927 km (0.11 R)
- M78: 34,671,102 km (0.089 R)
- M79: 35,069,481 km (0.039 R)
- M80: 36,100,659 km (0.053 R)
- M81: 36,215,849 km (0.09 R)
- M82: 37,432,678 km (0.083 R)
- M83: 38,310,070 km (0.12 R)
- M84: 39,016,920 km (0.088 R)
- M85: 39,194,343 km (0.088 R)
- M86: 39,490,547 km (0.119 R)
- M87: 39,668,568 km (0.117 R)
Planet 6 - Ice Giant
Semi-Major Axis: 7.18 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 933.3
Radius: 7.3
Gravity: 17.51 G
Time & Orbit
Eccentricity (e): 0.055
Orbit Range: 6.79 AU - 7.57 AU
Year: 12830 Days
Day: 16.4 Hours
Environment
Temp: -225 °C
Axial Tilt: 38.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (87)
Outer Limit: 62,741,449 km
- M1: 127,457 km (0.117 R)
- M2: 267,930 km (0.108 R)
- M3: 501,003 km (0.081 R)
- M4: 610,958 km (0.118 R)
- M5: 988,692 km (0.06 R)
- M6: 1,105,079 km (0.079 R)
- M7: 1,535,024 km (0.069 R)
- M8: 1,588,879 km (0.116 R)
- M9: 1,983,518 km (0.09 R)
- M10: 2,131,770 km (0.114 R)
- M11: 3,585,861 km (0.073 R)
- M12: 4,328,016 km (0.113 R)
- M13: 4,795,809 km (0.086 R)
- M14: 4,875,245 km (0.104 R)
- M15: 5,116,397 km (0.052 R)
- M16: 6,555,678 km (0.095 R)
- M17: 6,688,371 km (0.056 R)
- M18: 7,001,480 km (0.081 R)
- M19: 7,503,081 km (0.069 R)
- M20: 7,781,632 km (0.102 R)
- M21: 7,875,131 km (0.095 R)
- M22: 7,922,105 km (0.08 R)
- M23: 8,444,650 km (0.064 R)
- M24: 8,831,660 km (0.084 R)
- M25: 8,929,347 km (0.097 R)
- M26: 9,522,802 km (0.104 R)
- M27: 9,773,827 km (0.072 R)
- M28: 9,976,383 km (0.071 R)
- M29: 10,333,922 km (0.091 R)
- M30: 10,591,978 km (0.1 R)
- M31: 11,325,606 km (0.075 R)
- M32: 12,401,963 km (0.101 R)
- M33: 13,118,985 km (0.072 R)
- M34: 14,020,013 km (0.058 R)
- M35: 14,134,007 km (0.112 R)
- M36: 15,290,997 km (0.032 R)
- M37: 15,584,957 km (0.046 R)
- M38: 15,940,252 km (0.113 R)
- M39: 17,449,096 km (0.07 R)
- M40: 17,633,251 km (0.081 R)
- M41: 18,501,068 km (0.1 R)
- M42: 18,751,495 km (0.084 R)
- M43: 18,814,326 km (0.106 R)
- M44: 19,192,509 km (0.115 R)
- M45: 19,319,219 km (0.114 R)
- M46: 19,956,506 km (0.047 R)
- M47: 20,665,599 km (0.052 R)
- M48: 21,711,737 km (0.065 R)
- M49: 23,312,883 km (0.12 R)
- M50: 27,907,782 km (0.099 R)
- M51: 28,483,285 km (0.084 R)
- M52: 28,700,052 km (0.098 R)
- M53: 29,135,382 km (0.057 R)
- M54: 29,865,719 km (0.056 R)
- M55: 30,454,387 km (0.101 R)
- M56: 31,493,643 km (0.102 R)
- M57: 31,867,638 km (0.092 R)
- M58: 34,372,654 km (0.116 R)
- M59: 34,680,676 km (0.107 R)
- M60: 34,912,104 km (0.09 R)
- M61: 35,609,828 km (0.07 R)
- M62: 35,921,441 km (0.103 R)
- M63: 37,968,538 km (0.087 R)
- M64: 38,286,882 km (0.111 R)
- M65: 38,526,239 km (0.052 R)
- M66: 39,407,969 km (0.093 R)
- M67: 39,488,452 km (0.072 R)
- M68: 39,568,936 km (0.105 R)
- M69: 39,810,836 km (0.106 R)
- M70: 41,436,366 km (0.065 R)
- M71: 42,422,067 km (0.111 R)
- M72: 43,415,546 km (0.117 R)
- M73: 44,249,255 km (0.105 R)
- M74: 46,611,555 km (0.106 R)
- M75: 47,550,730 km (0.098 R)
- M76: 49,274,397 km (0.074 R)
- M77: 50,755,416 km (0.045 R)
- M78: 50,843,080 km (0.114 R)
- M79: 52,871,179 km (0.113 R)
- M80: 53,137,762 km (0.103 R)
- M81: 53,226,623 km (0.117 R)
- M82: 53,315,634 km (0.074 R)
- M83: 54,746,089 km (0.083 R)
- M84: 56,642,541 km (0.068 R)
- M85: 59,481,310 km (0.083 R)
- M86: 60,406,723 km (0.099 R)
- M87: 62,553,602 km (0.101 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: 412 - 11,406 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.