Star System Generated (Seed: 1768321879)
Star Details
Spectral Class: M6V
Temperature: 2,833 K
Mass: 0.29 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: 10.8 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.52 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 691.6
Radius: 14.8
Gravity: 3.16 G
Time & Orbit
Eccentricity (e): 0.159
Orbit Range: 0.44 AU - 0.6 AU
Year: 254 Days
Day: 12.5 Hours
Environment
Temp: -134 °C
Axial Tilt: 33 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (29)
Outer Limit: 40,143,791 km
- M1: 184,454 km (0.088 R)
- M2: 280,795 km (0.029 R)
- M3: 392,246 km (0.109 R)
- M4: 497,712 km (0.079 R)
- M5: 628,161 km (0.082 R)
- M6: 880,084 km (0.101 R)
- M7: 1,017,714 km (0.108 R)
- M8: 1,122,433 km (0.074 R)
- M9: 1,250,489 km (0.119 R)
- M10: 1,428,061 km (0.1 R)
- M11: 1,530,685 km (0.097 R)
- M12: 1,640,191 km (0.099 R)
- M13: 1,783,207 km (0.081 R)
- M14: 1,921,585 km (0.061 R)
- M15: 2,087,040 km (0.065 R)
- M16: 2,315,177 km (0.062 R)
- M17: 2,467,018 km (0.091 R)
- M18: 2,617,364 km (0.119 R)
- M19: 2,719,240 km (0.081 R)
- M20: 2,937,803 km (0.073 R)
- M21: 3,044,017 km (0.05 R)
- M22: 3,146,193 km (0.045 R)
- M23: 3,276,792 km (0.117 R)
- M24: 3,387,195 km (0.104 R)
- M25: 3,600,222 km (0.065 R)
- M26: 3,714,216 km (0.115 R)
- M27: 3,835,241 km (0.08 R)
- M28: 4,016,404 km (0.107 R)
- M29: 4,146,703 km (0.093 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.76 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 361.1
Radius: 12.5
Gravity: 2.31 G
Time & Orbit
Eccentricity (e): 0.157
Orbit Range: 0.64 AU - 0.88 AU
Year: 449 Days
Day: 13.7 Hours
Environment
Temp: -163 °C
Axial Tilt: 33.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (38)
Outer Limit: 40,143,791 km
- M1: 155,582 km (0.09 R)
- M2: 250,876 km (0.111 R)
- M3: 330,761 km (0.088 R)
- M4: 455,825 km (0.053 R)
- M5: 538,702 km (0.108 R)
- M6: 624,571 km (0.046 R)
- M7: 712,684 km (0.052 R)
- M8: 816,655 km (0.117 R)
- M9: 910,901 km (0.059 R)
- M10: 1,033,422 km (0.052 R)
- M11: 1,111,512 km (0.048 R)
- M12: 1,296,266 km (0.068 R)
- M13: 1,445,265 km (0.097 R)
- M14: 1,524,402 km (0.102 R)
- M15: 1,706,762 km (0.087 R)
- M16: 1,830,928 km (0.097 R)
- M17: 2,015,083 km (0.069 R)
- M18: 2,109,480 km (0.081 R)
- M19: 2,189,365 km (0.116 R)
- M20: 2,270,297 km (0.055 R)
- M21: 2,374,417 km (0.064 R)
- M22: 2,513,843 km (0.033 R)
- M23: 2,655,961 km (0.074 R)
- M24: 2,771,749 km (0.074 R)
- M25: 2,924,788 km (0.107 R)
- M26: 3,008,413 km (0.061 R)
- M27: 3,086,802 km (0.079 R)
- M28: 3,221,141 km (0.116 R)
- M29: 3,357,275 km (0.068 R)
- M30: 3,476,505 km (0.091 R)
- M31: 3,565,366 km (0.115 R)
- M32: 3,693,571 km (0.069 R)
- M33: 3,784,228 km (0.038 R)
- M34: 3,869,050 km (0.101 R)
- M35: 4,040,788 km (0.105 R)
- M36: 4,255,611 km (0.119 R)
- M37: 4,467,292 km (0.071 R)
- M38: 4,682,563 km (0.115 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.46 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 76.5
Radius: 13.7
Gravity: 0.41 G
Time & Orbit
Eccentricity (e): 0.199
Orbit Range: 1.17 AU - 1.75 AU
Year: 1197 Days
Day: 14.1 Hours
Environment
Temp: -197 °C
Axial Tilt: 48.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (41)
Outer Limit: 40,143,791 km
- M1: 175,777 km (0.116 R)
- M2: 293,361 km (0.103 R)
- M3: 390,600 km (0.079 R)
- M4: 476,619 km (0.102 R)
- M5: 564,882 km (0.087 R)
- M6: 663,766 km (0.083 R)
- M7: 777,610 km (0.045 R)
- M8: 882,627 km (0.104 R)
- M9: 988,543 km (0.095 R)
- M10: 1,085,781 km (0.071 R)
- M11: 1,172,698 km (0.094 R)
- M12: 1,310,178 km (0.072 R)
- M13: 1,428,360 km (0.076 R)
- M14: 1,591,871 km (0.092 R)
- M15: 1,681,480 km (0.074 R)
- M16: 1,799,962 km (0.084 R)
- M17: 1,988,904 km (0.045 R)
- M18: 2,261,321 km (0.063 R)
- M19: 2,375,016 km (0.114 R)
- M20: 2,509,055 km (0.089 R)
- M21: 2,595,822 km (0.104 R)
- M22: 2,683,487 km (0.099 R)
- M23: 2,797,779 km (0.116 R)
- M24: 2,887,837 km (0.086 R)
- M25: 2,978,942 km (0.083 R)
- M26: 3,170,876 km (0.117 R)
- M27: 3,264,974 km (0.083 R)
- M28: 3,387,345 km (0.08 R)
- M29: 3,511,361 km (0.045 R)
- M30: 3,742,640 km (0.109 R)
- M31: 3,921,259 km (0.071 R)
- M32: 4,022,687 km (0.118 R)
- M33: 4,139,523 km (0.086 R)
- M34: 4,272,366 km (0.079 R)
- M35: 4,527,280 km (0.111 R)
- M36: 4,687,350 km (0.111 R)
- M37: 4,826,027 km (0.118 R)
- M38: 5,138,986 km (0.06 R)
- M39: 5,234,280 km (0.08 R)
- M40: 5,394,350 km (0.111 R)
- M41: 5,515,524 km (0.065 R)
Planet 4 - Gas Giant
Semi-Major Axis: 3.19 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 109.6
Radius: 8.1
Gravity: 1.67 G
Time & Orbit
Eccentricity (e): 0.116
Orbit Range: 2.82 AU - 3.56 AU
Year: 3864 Days
Day: 10.3 Hours
Environment
Temp: -216 °C
Axial Tilt: 33.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (41)
Outer Limit: 40,143,791 km
- M1: 210,335 km (0.05 R)
- M2: 302,188 km (0.106 R)
- M3: 365,468 km (0.111 R)
- M4: 422,614 km (0.048 R)
- M5: 677,529 km (0.111 R)
- M6: 735,722 km (0.089 R)
- M7: 849,566 km (0.062 R)
- M8: 986,149 km (0.114 R)
- M9: 1,078,301 km (0.109 R)
- M10: 2,604,948 km (0.059 R)
- M11: 2,710,564 km (0.064 R)
- M12: 2,805,858 km (0.092 R)
- M13: 3,222,787 km (0.115 R)
- M14: 3,659,314 km (0.106 R)
- M15: 3,738,301 km (0.112 R)
- M16: 4,032,710 km (0.1 R)
- M17: 4,182,756 km (0.03 R)
- M18: 4,787,132 km (0.12 R)
- M19: 4,873,599 km (0.049 R)
- M20: 5,328,975 km (0.106 R)
- M21: 5,599,598 km (0.093 R)
- M22: 5,844,041 km (0.114 R)
- M23: 5,936,492 km (0.076 R)
- M24: 7,052,044 km (0.068 R)
- M25: 7,266,268 km (0.11 R)
- M26: 8,438,816 km (0.084 R)
- M27: 8,596,043 km (0.06 R)
- M28: 8,719,013 km (0.087 R)
- M29: 9,234,826 km (0.043 R)
- M30: 9,487,347 km (0.101 R)
- M31: 9,907,269 km (0.111 R)
- M32: 10,017,672 km (0.109 R)
- M33: 10,165,774 km (0.117 R)
- M34: 10,426,523 km (0.034 R)
- M35: 10,501,471 km (0.091 R)
- M36: 11,337,275 km (0.095 R)
- M37: 12,076,288 km (0.084 R)
- M38: 12,372,342 km (0.106 R)
- M39: 12,830,860 km (0.065 R)
- M40: 13,254,371 km (0.074 R)
- M41: 13,641,531 km (0.043 R)
Planet 5 - Gas Giant
Semi-Major Axis: 5.58 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 272.9
Radius: 8.6
Gravity: 3.69 G
Time & Orbit
Eccentricity (e): 0.235
Orbit Range: 4.27 AU - 6.89 AU
Year: 8940 Days
Day: 5.8 Hours
Environment
Temp: -234 °C
Axial Tilt: 10.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (85)
Outer Limit: 40,143,791 km
- M1: 166,951 km (0.119 R)
- M2: 228,286 km (0.094 R)
- M3: 449,990 km (0.102 R)
- M4: 635,193 km (0.093 R)
- M5: 804,089 km (0.067 R)
- M6: 1,077,404 km (0.113 R)
- M7: 1,138,589 km (0.1 R)
- M8: 1,707,211 km (0.107 R)
- M9: 1,908,270 km (0.107 R)
- M10: 2,117,109 km (0.046 R)
- M11: 3,046,860 km (0.074 R)
- M12: 3,404,848 km (0.12 R)
- M13: 4,258,603 km (0.116 R)
- M14: 4,482,102 km (0.087 R)
- M15: 4,582,781 km (0.092 R)
- M16: 4,863,128 km (0.116 R)
- M17: 5,149,308 km (0.094 R)
- M18: 5,307,732 km (0.114 R)
- M19: 5,467,653 km (0.064 R)
- M20: 5,602,291 km (0.057 R)
- M21: 5,737,976 km (0.12 R)
- M22: 5,929,760 km (0.095 R)
- M23: 6,319,762 km (0.107 R)
- M24: 6,432,708 km (0.066 R)
- M25: 7,036,785 km (0.045 R)
- M26: 7,538,985 km (0.096 R)
- M27: 7,628,893 km (0.095 R)
- M28: 8,298,493 km (0.092 R)
- M29: 8,765,986 km (0.09 R)
- M30: 8,892,097 km (0.095 R)
- M31: 9,114,250 km (0.104 R)
- M32: 9,177,979 km (0.084 R)
- M33: 9,563,941 km (0.096 R)
- M34: 9,628,867 km (0.119 R)
- M35: 9,791,629 km (0.053 R)
- M36: 9,988,201 km (0.074 R)
- M37: 10,054,024 km (0.111 R)
- M38: 10,888,631 km (0.117 R)
- M39: 11,503,328 km (0.091 R)
- M40: 11,572,293 km (0.087 R)
- M41: 12,129,246 km (0.11 R)
- M42: 12,517,303 km (0.101 R)
- M43: 12,909,399 km (0.033 R)
- M44: 13,341,737 km (0.055 R)
- M45: 13,523,199 km (0.083 R)
- M46: 13,632,555 km (0.098 R)
- M47: 13,888,816 km (0.071 R)
- M48: 14,443,226 km (0.059 R)
- M49: 14,554,975 km (0.112 R)
- M50: 14,704,424 km (0.075 R)
- M51: 15,269,455 km (0.108 R)
- M52: 15,535,589 km (0.043 R)
- M53: 16,889,151 km (0.088 R)
- M54: 17,124,917 km (0.12 R)
- M55: 17,361,880 km (0.108 R)
- M56: 17,480,661 km (0.073 R)
- M57: 17,679,327 km (0.078 R)
- M58: 17,998,868 km (0.039 R)
- M59: 18,199,479 km (0.109 R)
- M60: 18,562,553 km (0.064 R)
- M61: 18,887,330 km (0.101 R)
- M62: 19,254,892 km (0.109 R)
- M63: 19,501,279 km (0.077 R)
- M64: 21,043,484 km (0.08 R)
- M65: 21,978,919 km (0.086 R)
- M66: 22,581,350 km (0.073 R)
- M67: 23,189,016 km (0.111 R)
- M68: 23,276,381 km (0.111 R)
- M69: 23,494,944 km (0.071 R)
- M70: 23,846,200 km (0.07 R)
- M71: 24,376,375 km (0.076 R)
- M72: 24,821,129 km (0.097 R)
- M73: 25,448,243 km (0.092 R)
- M74: 25,673,538 km (0.111 R)
- M75: 26,035,415 km (0.093 R)
- M76: 26,216,877 km (0.103 R)
- M77: 27,176,847 km (0.118 R)
- M78: 27,499,380 km (0.075 R)
- M79: 27,869,485 km (0.05 R)
- M80: 28,194,711 km (0.112 R)
- M81: 29,272,264 km (0.083 R)
- M82: 29,413,784 km (0.113 R)
- M83: 30,937,737 km (0.067 R)
- M84: 31,612,424 km (0.117 R)
- M85: 32,535,891 km (0.116 R)
Planet 6 - Ice Giant
Semi-Major Axis: 6.12 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 576.3
Radius: 6.7
Gravity: 12.84 G
Time & Orbit
Eccentricity (e): 0.047
Orbit Range: 5.83 AU - 6.41 AU
Year: 10269 Days
Day: 15.7 Hours
Environment
Temp: -237 °C
Axial Tilt: 42.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (90)
Outer Limit: 40,143,791 km
- M1: 129,253 km (0.076 R)
- M2: 203,752 km (0.101 R)
- M3: 953,088 km (0.099 R)
- M4: 1,123,630 km (0.11 R)
- M5: 1,493,735 km (0.116 R)
- M6: 1,852,919 km (0.086 R)
- M7: 2,263,117 km (0.065 R)
- M8: 2,440,091 km (0.094 R)
- M9: 2,754,097 km (0.03 R)
- M10: 2,888,884 km (0.114 R)
- M11: 3,220,842 km (0.105 R)
- M12: 3,535,895 km (0.116 R)
- M13: 3,652,881 km (0.091 R)
- M14: 3,711,972 km (0.074 R)
- M15: 3,890,891 km (0.104 R)
- M16: 4,042,134 km (0.096 R)
- M17: 4,133,838 km (0.115 R)
- M18: 4,226,289 km (0.114 R)
- M19: 4,288,223 km (0.113 R)
- M20: 4,570,963 km (0.111 R)
- M21: 5,320,747 km (0.081 R)
- M22: 5,899,093 km (0.057 R)
- M23: 6,713,354 km (0.106 R)
- M24: 7,004,621 km (0.065 R)
- M25: 7,151,975 km (0.101 R)
- M26: 7,751,264 km (0.09 R)
- M27: 8,327,665 km (0.099 R)
- M28: 8,878,035 km (0.097 R)
- M29: 9,561,997 km (0.095 R)
- M30: 9,725,507 km (0.093 R)
- M31: 10,179,686 km (0.086 R)
- M32: 10,725,270 km (0.089 R)
- M33: 11,237,493 km (0.047 R)
- M34: 12,329,857 km (0.109 R)
- M35: 12,911,194 km (0.092 R)
- M36: 12,956,223 km (0.065 R)
- M37: 13,547,134 km (0.099 R)
- M38: 13,638,838 km (0.092 R)
- M39: 14,239,922 km (0.119 R)
- M40: 15,038,924 km (0.074 R)
- M41: 15,611,585 km (0.038 R)
- M42: 16,045,868 km (0.036 R)
- M43: 16,191,576 km (0.084 R)
- M44: 16,532,958 km (0.1 R)
- M45: 17,822,193 km (0.06 R)
- M46: 18,124,231 km (0.094 R)
- M47: 18,938,043 km (0.106 R)
- M48: 19,143,441 km (0.068 R)
- M49: 19,504,421 km (0.057 R)
- M50: 19,608,092 km (0.067 R)
- M51: 19,867,794 km (0.066 R)
- M52: 20,338,279 km (0.106 R)
- M53: 21,450,091 km (0.074 R)
- M54: 25,014,559 km (0.116 R)
- M55: 27,471,405 km (0.108 R)
- M56: 28,053,789 km (0.111 R)
- M57: 28,170,625 km (0.098 R)
- M58: 28,287,761 km (0.102 R)
- M59: 28,405,045 km (0.109 R)
- M60: 28,816,739 km (0.11 R)
- M61: 29,646,109 km (0.057 R)
- M62: 29,705,649 km (0.119 R)
- M63: 29,765,339 km (0.051 R)
- M64: 31,571,284 km (0.047 R)
- M65: 32,242,231 km (0.056 R)
- M66: 32,364,751 km (0.033 R)
- M67: 32,794,696 km (0.083 R)
- M68: 33,041,383 km (0.098 R)
- M69: 33,412,385 km (0.114 R)
- M70: 33,474,319 km (0.098 R)
- M71: 33,784,734 km (0.115 R)
- M72: 34,784,497 km (0.109 R)
- M73: 35,414,304 km (0.116 R)
- M74: 38,035,408 km (0.078 R)
- M75: 38,229,736 km (0.047 R)
- M76: 38,294,512 km (0.098 R)
- M77: 38,554,214 km (0.087 R)
- M78: 39,075,113 km (0.072 R)
- M79: 39,467,509 km (0.099 R)
- M80: 39,729,754 km (0.112 R)
- M81: 39,795,427 km (0.118 R)
- M82: 40,190,066 km (0.085 R)
- M83: 40,850,840 km (0.094 R)
- M84: 40,983,384 km (0.104 R)
- M85: 41,915,528 km (0.096 R)
- M86: 41,982,398 km (0.108 R)
- M87: 42,719,916 km (0.033 R)
- M88: 43,056,661 km (0.047 R)
- M89: 43,664,926 km (0.03 R)
- M90: 45,300,778 km (0.042 R)
Planet 7 - Ice Giant
Semi-Major Axis: 6.19 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 368.8
Radius: 6.1
Gravity: 9.91 G
Time & Orbit
Eccentricity (e): 0.076
Orbit Range: 5.72 AU - 6.66 AU
Year: 10445 Days
Day: 22.9 Hours
Environment
Temp: -237 °C
Axial Tilt: 48.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (91)
Outer Limit: 40,143,791 km
- M1: 86,019 km (0.116 R)
- M2: 294,558 km (0.075 R)
- M3: 578,645 km (0.086 R)
- M4: 709,393 km (0.073 R)
- M5: 1,086,380 km (0.114 R)
- M6: 1,557,613 km (0.045 R)
- M7: 2,219,883 km (0.085 R)
- M8: 2,265,361 km (0.097 R)
- M9: 2,959,046 km (0.12 R)
- M10: 3,499,543 km (0.108 R)
- M11: 3,876,829 km (0.1 R)
- M12: 4,126,208 km (0.119 R)
- M13: 4,238,706 km (0.113 R)
- M14: 4,409,397 km (0.087 R)
- M15: 4,466,693 km (0.084 R)
- M16: 4,669,548 km (0.079 R)
- M17: 4,757,511 km (0.066 R)
- M18: 5,980,624 km (0.072 R)
- M19: 6,333,226 km (0.06 R)
- M20: 6,593,975 km (0.108 R)
- M21: 6,758,682 km (0.067 R)
- M22: 6,891,525 km (0.071 R)
- M23: 7,499,640 km (0.108 R)
- M24: 7,568,156 km (0.036 R)
- M25: 7,637,121 km (0.062 R)
- M26: 8,266,030 km (0.092 R)
- M27: 8,838,990 km (0.093 R)
- M28: 9,387,715 km (0.071 R)
- M29: 9,797,165 km (0.085 R)
- M30: 10,174,301 km (0.107 R)
- M31: 10,288,444 km (0.042 R)
- M32: 10,556,374 km (0.079 R)
- M33: 11,177,355 km (0.094 R)
- M34: 11,492,258 km (0.093 R)
- M35: 12,130,891 km (0.062 R)
- M36: 12,211,525 km (0.087 R)
- M37: 13,234,325 km (0.053 R)
- M38: 13,609,367 km (0.112 R)
- M39: 13,735,179 km (0.104 R)
- M40: 15,535,888 km (0.064 R)
- M41: 15,667,385 km (0.073 R)
- M42: 16,330,104 km (0.082 R)
- M43: 16,419,264 km (0.113 R)
- M44: 16,463,844 km (0.11 R)
- M45: 17,318,646 km (0.104 R)
- M46: 17,957,878 km (0.08 R)
- M47: 18,884,338 km (0.095 R)
- M48: 19,071,485 km (0.1 R)
- M49: 19,731,361 km (0.11 R)
- M50: 19,968,773 km (0.111 R)
- M51: 20,111,639 km (0.089 R)
- M52: 20,159,360 km (0.06 R)
- M53: 20,638,672 km (0.105 R)
- M54: 20,783,333 km (0.102 R)
- M55: 21,316,051 km (0.07 R)
- M56: 21,657,433 km (0.062 R)
- M57: 21,706,352 km (0.118 R)
- M58: 22,345,733 km (0.108 R)
- M59: 22,395,100 km (0.097 R)
- M60: 22,841,650 km (0.089 R)
- M61: 23,693,161 km (0.118 R)
- M62: 24,046,811 km (0.046 R)
- M63: 24,097,375 km (0.099 R)
- M64: 24,148,088 km (0.065 R)
- M65: 24,249,665 km (0.114 R)
- M66: 24,300,379 km (0.085 R)
- M67: 24,912,833 km (0.117 R)
- M68: 25,633,745 km (0.099 R)
- M69: 26,727,904 km (0.107 R)
- M70: 26,832,772 km (0.109 R)
- M71: 27,095,914 km (0.093 R)
- M72: 27,518,678 km (0.081 R)
- M73: 28,210,269 km (0.119 R)
- M74: 28,853,689 km (0.106 R)
- M75: 32,422,197 km (0.116 R)
- M76: 32,534,246 km (0.095 R)
- M77: 32,590,195 km (0.041 R)
- M78: 32,927,239 km (0.113 R)
- M79: 33,096,135 km (0.102 R)
- M80: 33,378,277 km (0.067 R)
- M81: 34,457,626 km (0.094 R)
- M82: 35,260,368 km (0.113 R)
- M83: 35,721,728 km (0.098 R)
- M84: 36,069,094 km (0.044 R)
- M85: 37,000,939 km (0.108 R)
- M86: 37,118,074 km (0.109 R)
- M87: 38,117,837 km (0.048 R)
- M88: 38,650,704 km (0.07 R)
- M89: 38,828,875 km (0.063 R)
- M90: 38,888,266 km (0.081 R)
- M91: 39,723,770 km (0.059 R)
Kuiper Belt
Range: 30 - 52 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 333 - 18,590 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.