Star System Generated (Seed: 1766152865)
Star Details
Spectral Class: M9V
Temperature: 2,400 K
Mass: 0.27 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: 10.4 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.78 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 605
Radius: 13.5
Gravity: 3.32 G
Time & Orbit
Eccentricity (e): 0.123
Orbit Range: 0.68 AU - 0.88 AU
Year: 484 Days
Day: 15 Hours
Environment
Temp: -164 °C
Axial Tilt: 25.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (38)
Outer Limit: 66,641,499 km
- M1: 172,187 km (0.098 R)
- M2: 273,315 km (0.057 R)
- M3: 361,428 km (0.096 R)
- M4: 469,139 km (0.075 R)
- M5: 569,818 km (0.059 R)
- M6: 667,805 km (0.082 R)
- M7: 768,484 km (0.08 R)
- M8: 883,974 km (0.096 R)
- M9: 1,086,230 km (0.109 R)
- M10: 1,203,365 km (0.06 R)
- M11: 1,356,254 km (0.104 R)
- M12: 1,548,787 km (0.061 R)
- M13: 1,648,569 km (0.12 R)
- M14: 1,913,955 km (0.094 R)
- M15: 2,027,650 km (0.099 R)
- M16: 2,150,021 km (0.099 R)
- M17: 2,363,946 km (0.067 R)
- M18: 2,467,018 km (0.114 R)
- M19: 2,584,902 km (0.112 R)
- M20: 2,874,373 km (0.073 R)
- M21: 3,068,701 km (0.041 R)
- M22: 3,245,825 km (0.072 R)
- M23: 3,404,698 km (0.084 R)
- M24: 3,514,503 km (0.093 R)
- M25: 3,632,835 km (0.099 R)
- M26: 4,112,445 km (0.092 R)
- M27: 4,308,419 km (0.088 R)
- M28: 4,411,492 km (0.085 R)
- M29: 4,507,533 km (0.076 R)
- M30: 4,669,099 km (0.028 R)
- M31: 4,832,460 km (0.101 R)
- M32: 5,039,503 km (0.118 R)
- M33: 5,300,402 km (0.097 R)
- M34: 5,454,039 km (0.077 R)
- M35: 5,557,112 km (0.091 R)
- M36: 5,695,789 km (0.058 R)
- M37: 5,870,669 km (0.026 R)
- M38: 5,994,237 km (0.061 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.07 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 807.8
Radius: 13.3
Gravity: 4.57 G
Time & Orbit
Eccentricity (e): 0.198
Orbit Range: 0.86 AU - 1.28 AU
Year: 778 Days
Day: 6.3 Hours
Environment
Temp: -183 °C
Axial Tilt: 12.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (53)
Outer Limit: 66,641,499 km
- M1: 191,036 km (0.048 R)
- M2: 359,035 km (0.078 R)
- M3: 464,950 km (0.092 R)
- M4: 556,354 km (0.082 R)
- M5: 686,654 km (0.054 R)
- M6: 772,823 km (0.105 R)
- M7: 915,988 km (0.052 R)
- M8: 1,000,511 km (0.114 R)
- M9: 1,132,755 km (0.082 R)
- M10: 1,284,747 km (0.116 R)
- M11: 1,501,065 km (0.092 R)
- M12: 1,632,412 km (0.114 R)
- M13: 1,767,798 km (0.062 R)
- M14: 1,860,250 km (0.106 R)
- M15: 2,010,147 km (0.093 R)
- M16: 2,188,766 km (0.062 R)
- M17: 2,339,112 km (0.091 R)
- M18: 2,458,342 km (0.11 R)
- M19: 2,544,809 km (0.089 R)
- M20: 2,703,234 km (0.06 R)
- M21: 2,801,819 km (0.108 R)
- M22: 2,993,154 km (0.089 R)
- M23: 3,076,630 km (0.1 R)
- M24: 3,198,402 km (0.073 R)
- M25: 3,427,736 km (0.078 R)
- M26: 3,554,296 km (0.028 R)
- M27: 3,702,248 km (0.071 R)
- M28: 3,902,859 km (0.091 R)
- M29: 4,055,598 km (0.073 R)
- M30: 4,189,638 km (0.047 R)
- M31: 4,441,112 km (0.067 R)
- M32: 4,773,369 km (0.109 R)
- M33: 4,926,108 km (0.09 R)
- M34: 5,203,014 km (0.066 R)
- M35: 5,315,212 km (0.083 R)
- M36: 5,542,003 km (0.088 R)
- M37: 5,830,128 km (0.039 R)
- M38: 5,946,815 km (0.117 R)
- M39: 6,206,217 km (0.089 R)
- M40: 6,566,000 km (0.057 R)
- M41: 6,920,248 km (0.108 R)
- M42: 7,193,264 km (0.029 R)
- M43: 7,419,306 km (0.054 R)
- M44: 7,660,309 km (0.103 R)
- M45: 7,826,961 km (0.04 R)
- M46: 7,917,019 km (0.05 R)
- M47: 8,373,142 km (0.066 R)
- M48: 8,504,938 km (0.119 R)
- M49: 8,664,110 km (0.11 R)
- M50: 8,757,459 km (0.117 R)
- M51: 8,904,813 km (0.118 R)
- M52: 9,025,988 km (0.085 R)
- M53: 9,134,147 km (0.104 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.07 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 282.3
Radius: 14.8
Gravity: 1.29 G
Time & Orbit
Eccentricity (e): 0.072
Orbit Range: 0.99 AU - 1.15 AU
Year: 778 Days
Day: 9.6 Hours
Environment
Temp: -188 °C
Axial Tilt: 24 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (37)
Outer Limit: 66,641,499 km
- M1: 186,249 km (0.1 R)
- M2: 321,635 km (0.11 R)
- M3: 440,117 km (0.103 R)
- M4: 540,048 km (0.095 R)
- M5: 658,380 km (0.046 R)
- M6: 766,091 km (0.107 R)
- M7: 922,121 km (0.054 R)
- M8: 1,040,902 km (0.075 R)
- M9: 1,134,999 km (0.081 R)
- M10: 1,316,760 km (0.091 R)
- M11: 1,475,185 km (0.084 R)
- M12: 1,728,454 km (0.05 R)
- M13: 1,928,017 km (0.109 R)
- M14: 2,021,366 km (0.088 R)
- M15: 2,193,404 km (0.07 R)
- M16: 2,304,406 km (0.034 R)
- M17: 2,397,306 km (0.104 R)
- M18: 2,532,243 km (0.039 R)
- M19: 2,635,166 km (0.032 R)
- M20: 2,774,592 km (0.093 R)
- M21: 2,916,710 km (0.062 R)
- M22: 3,252,856 km (0.035 R)
- M23: 3,540,234 km (0.089 R)
- M24: 3,812,352 km (0.042 R)
- M25: 3,923,204 km (0.096 R)
- M26: 4,172,584 km (0.074 R)
- M27: 4,352,700 km (0.101 R)
- M28: 4,460,410 km (0.072 R)
- M29: 4,619,433 km (0.035 R)
- M30: 4,840,239 km (0.118 R)
- M31: 5,142,876 km (0.081 R)
- M32: 5,292,324 km (0.105 R)
- M33: 5,721,819 km (0.096 R)
- M34: 5,876,653 km (0.084 R)
- M35: 6,172,109 km (0.068 R)
- M36: 6,293,433 km (0.046 R)
- M37: 6,481,777 km (0.077 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.65 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 181.9
Radius: 12.5
Gravity: 1.16 G
Time & Orbit
Eccentricity (e): 0.031
Orbit Range: 1.6 AU - 1.7 AU
Year: 1490 Days
Day: 10.2 Hours
Environment
Temp: -205 °C
Axial Tilt: 7.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (42)
Outer Limit: 66,641,499 km
- M1: 174,282 km (0.066 R)
- M2: 323,131 km (0.117 R)
- M3: 508,932 km (0.073 R)
- M4: 596,148 km (0.096 R)
- M5: 715,078 km (0.105 R)
- M6: 794,065 km (0.095 R)
- M7: 882,029 km (0.116 R)
- M8: 1,026,840 km (0.092 R)
- M9: 1,130,362 km (0.079 R)
- M10: 1,243,906 km (0.111 R)
- M11: 1,442,423 km (0.108 R)
- M12: 1,796,820 km (0.069 R)
- M13: 1,901,090 km (0.073 R)
- M14: 1,992,045 km (0.116 R)
- M15: 2,170,815 km (0.086 R)
- M16: 2,428,721 km (0.071 R)
- M17: 2,519,677 km (0.066 R)
- M18: 2,886,491 km (0.054 R)
- M19: 3,399,163 km (0.104 R)
- M20: 3,604,860 km (0.095 R)
- M21: 3,930,834 km (0.059 R)
- M22: 4,028,521 km (0.109 R)
- M23: 4,286,428 km (0.11 R)
- M24: 4,601,182 km (0.076 R)
- M25: 4,714,577 km (0.036 R)
- M26: 4,912,944 km (0.065 R)
- M27: 5,188,802 km (0.101 R)
- M28: 5,317,756 km (0.105 R)
- M29: 5,513,430 km (0.076 R)
- M30: 5,700,427 km (0.111 R)
- M31: 5,833,569 km (0.113 R)
- M32: 5,934,248 km (0.078 R)
- M33: 6,024,157 km (0.088 R)
- M34: 6,400,096 km (0.102 R)
- M35: 6,865,944 km (0.077 R)
- M36: 7,043,517 km (0.032 R)
- M37: 7,162,746 km (0.081 R)
- M38: 7,512,356 km (0.098 R)
- M39: 7,646,546 km (0.108 R)
- M40: 8,091,001 km (0.043 R)
- M41: 8,203,349 km (0.079 R)
- M42: 8,341,577 km (0.077 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.15 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 620.8
Radius: 9.4
Gravity: 7.03 G
Time & Orbit
Eccentricity (e): 0.249
Orbit Range: 1.61 AU - 2.69 AU
Year: 2216 Days
Day: 5.8 Hours
Environment
Temp: -194 °C
Axial Tilt: 10.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (74)
Outer Limit: 66,641,499 km
- M1: 161,117 km (0.084 R)
- M2: 232,176 km (0.116 R)
- M3: 340,485 km (0.12 R)
- M4: 491,429 km (0.07 R)
- M5: 579,991 km (0.098 R)
- M6: 690,843 km (0.116 R)
- M7: 844,630 km (0.09 R)
- M8: 907,610 km (0.085 R)
- M9: 1,067,680 km (0.115 R)
- M10: 1,176,288 km (0.101 R)
- M11: 1,268,141 km (0.11 R)
- M12: 1,437,486 km (0.118 R)
- M13: 1,558,361 km (0.088 R)
- M14: 1,637,049 km (0.079 R)
- M15: 1,905,278 km (0.088 R)
- M16: 2,100,354 km (0.088 R)
- M17: 2,366,190 km (0.064 R)
- M18: 2,670,023 km (0.092 R)
- M19: 2,765,017 km (0.113 R)
- M20: 2,874,972 km (0.037 R)
- M21: 2,944,385 km (0.077 R)
- M22: 3,056,733 km (0.036 R)
- M23: 3,228,023 km (0.104 R)
- M24: 3,300,279 km (0.052 R)
- M25: 3,461,246 km (0.099 R)
- M26: 3,639,866 km (0.099 R)
- M27: 3,852,145 km (0.053 R)
- M28: 4,130,996 km (0.115 R)
- M29: 4,352,550 km (0.09 R)
- M30: 4,432,585 km (0.096 R)
- M31: 4,610,606 km (0.094 R)
- M32: 5,431,450 km (0.031 R)
- M33: 5,622,038 km (0.116 R)
- M34: 5,814,720 km (0.104 R)
- M35: 6,206,816 km (0.097 R)
- M36: 6,755,241 km (0.067 R)
- M37: 6,885,541 km (0.048 R)
- M38: 7,626,200 km (0.109 R)
- M39: 7,742,438 km (0.115 R)
- M40: 9,203,111 km (0.066 R)
- M41: 9,326,978 km (0.083 R)
- M42: 9,430,650 km (0.086 R)
- M43: 9,534,620 km (0.12 R)
- M44: 9,764,702 km (0.109 R)
- M45: 9,848,776 km (0.036 R)
- M46: 9,912,056 km (0.038 R)
- M47: 10,251,792 km (0.089 R)
- M48: 10,337,362 km (0.083 R)
- M49: 10,509,101 km (0.08 R)
- M50: 10,660,195 km (0.101 R)
- M51: 11,117,665 km (0.082 R)
- M52: 11,227,619 km (0.078 R)
- M53: 11,360,014 km (0.082 R)
- M54: 11,426,285 km (0.113 R)
- M55: 11,693,168 km (0.111 R)
- M56: 11,827,357 km (0.04 R)
- M57: 12,097,232 km (0.041 R)
- M58: 12,165,000 km (0.059 R)
- M59: 12,323,723 km (0.101 R)
- M60: 12,872,897 km (0.062 R)
- M61: 12,942,161 km (0.06 R)
- M62: 13,034,612 km (0.108 R)
- M63: 13,829,725 km (0.105 R)
- M64: 14,161,682 km (0.093 R)
- M65: 14,568,289 km (0.083 R)
- M66: 14,640,396 km (0.078 R)
- M67: 14,833,377 km (0.112 R)
- M68: 15,221,883 km (0.059 R)
- M69: 15,393,023 km (0.061 R)
- M70: 15,712,414 km (0.075 R)
- M71: 15,835,832 km (0.064 R)
- M72: 16,133,233 km (0.113 R)
- M73: 16,708,736 km (0.09 R)
- M74: 16,809,415 km (0.035 R)
Planet 6 - Ice Giant
Semi-Major Axis: 5.84 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 118.2
Radius: 7.2
Gravity: 2.28 G
Time & Orbit
Eccentricity (e): 0.017
Orbit Range: 5.74 AU - 5.94 AU
Year: 9920 Days
Day: 24.1 Hours
Environment
Temp: -234 °C
Axial Tilt: 24.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 66,641,499 km
- M1: 101,876 km (0.116 R)
- M2: 153,487 km (0.084 R)
- M3: 206,894 km (0.116 R)
- M4: 342,130 km (0.056 R)
- M5: 412,292 km (0.115 R)
- M6: 459,116 km (0.083 R)
- M7: 938,727 km (0.118 R)
- M8: 1,161,777 km (0.119 R)
- M9: 1,244,654 km (0.092 R)
- M10: 1,416,393 km (0.067 R)
- M11: 1,641,837 km (0.049 R)
- M12: 1,688,212 km (0.067 R)
- M13: 1,798,466 km (0.101 R)
- M14: 1,911,113 km (0.109 R)
- M15: 1,993,092 km (0.047 R)
- M16: 2,076,269 km (0.048 R)
- M17: 2,211,655 km (0.073 R)
- M18: 2,297,823 km (0.101 R)
- M19: 2,420,194 km (0.105 R)
- M20: 2,473,451 km (0.042 R)
- M21: 2,912,970 km (0.088 R)
- M22: 2,969,518 km (0.096 R)
- M23: 3,141,705 km (0.097 R)
- M24: 3,396,320 km (0.101 R)
- M25: 4,051,110 km (0.112 R)
- M26: 4,263,689 km (0.103 R)
- M27: 4,392,941 km (0.044 R)
- M28: 4,501,699 km (0.088 R)
- M29: 4,900,677 km (0.107 R)
- M30: 5,081,690 km (0.116 R)
- M31: 5,756,077 km (0.07 R)
- M32: 6,019,220 km (0.105 R)
- M33: 6,140,245 km (0.044 R)
- M34: 6,335,320 km (0.09 R)
- M35: 6,782,019 km (0.086 R)
- M36: 7,059,972 km (0.077 R)
- M37: 7,110,836 km (0.079 R)
- M38: 7,187,430 km (0.088 R)
- M39: 7,264,473 km (0.11 R)
- M40: 7,784,176 km (0.056 R)
- M41: 8,181,956 km (0.107 R)
- M42: 8,640,623 km (0.112 R)
- M43: 9,052,466 km (0.087 R)
- M44: 9,302,594 km (0.1 R)
- M45: 9,414,493 km (0.025 R)
- M46: 9,526,841 km (0.117 R)
- M47: 10,181,481 km (0.079 R)
- M48: 10,383,588 km (0.094 R)
- M49: 10,470,505 km (0.1 R)
- M50: 10,528,698 km (0.026 R)
- M51: 10,616,213 km (0.043 R)
- M52: 11,443,938 km (0.114 R)
- M53: 12,445,795 km (0.105 R)
- M54: 12,600,030 km (0.098 R)
- M55: 12,910,446 km (0.083 R)
- M56: 14,145,077 km (0.1 R)
- M57: 14,727,611 km (0.108 R)
- M58: 15,153,068 km (0.098 R)
- M59: 15,450,169 km (0.098 R)
- M60: 16,657,125 km (0.12 R)
- M61: 16,997,759 km (0.105 R)
- M62: 17,790,029 km (0.107 R)
- M63: 18,068,431 km (0.112 R)
- M64: 18,138,293 km (0.083 R)
- M65: 18,243,161 km (0.117 R)
- M66: 18,559,112 km (0.057 R)
- M67: 19,625,146 km (0.088 R)
- M68: 19,696,953 km (0.047 R)
- M69: 19,984,929 km (0.103 R)
- M70: 20,310,604 km (0.073 R)
- M71: 20,601,422 km (0.059 R)
- M72: 21,113,944 km (0.073 R)
- M73: 21,890,507 km (0.081 R)
- M74: 22,039,506 km (0.087 R)
- M75: 22,601,246 km (0.057 R)
- M76: 23,357,464 km (0.078 R)
- M77: 24,430,080 km (0.079 R)
- M78: 25,166,999 km (0.1 R)
- M79: 25,440,464 km (0.055 R)
Planet 7 - Ice Giant
Semi-Major Axis: 8.56 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 594
Radius: 6.9
Gravity: 12.48 G
Time & Orbit
Eccentricity (e): 0.131
Orbit Range: 7.44 AU - 9.68 AU
Year: 17604 Days
Day: 20.4 Hours
Environment
Temp: -237 °C
Axial Tilt: 26.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (93)
Outer Limit: 66,641,499 km
- M1: 173,234 km (0.073 R)
- M2: 302,936 km (0.108 R)
- M3: 364,869 km (0.092 R)
- M4: 521,648 km (0.098 R)
- M5: 763,996 km (0.092 R)
- M6: 829,969 km (0.111 R)
- M7: 1,088,474 km (0.118 R)
- M8: 1,188,705 km (0.106 R)
- M9: 1,292,077 km (0.084 R)
- M10: 1,371,663 km (0.059 R)
- M11: 1,535,622 km (0.119 R)
- M12: 1,591,721 km (0.071 R)
- M13: 1,677,291 km (0.109 R)
- M14: 1,823,299 km (0.119 R)
- M15: 1,882,839 km (0.097 R)
- M16: 2,127,731 km (0.113 R)
- M17: 2,222,127 km (0.1 R)
- M18: 2,318,019 km (0.107 R)
- M19: 2,715,351 km (0.062 R)
- M20: 3,609,647 km (0.053 R)
- M21: 4,226,140 km (0.039 R)
- M22: 4,546,578 km (0.077 R)
- M23: 4,709,790 km (0.077 R)
- M24: 4,792,069 km (0.087 R)
- M25: 5,597,952 km (0.109 R)
- M26: 5,772,832 km (0.084 R)
- M27: 6,444,975 km (0.106 R)
- M28: 6,813,585 km (0.078 R)
- M29: 7,475,106 km (0.098 R)
- M30: 7,571,298 km (0.041 R)
- M31: 7,862,266 km (0.101 R)
- M32: 7,911,184 km (0.076 R)
- M33: 10,052,678 km (0.088 R)
- M34: 10,695,649 km (0.072 R)
- M35: 11,241,532 km (0.12 R)
- M36: 11,351,786 km (0.111 R)
- M37: 12,702,804 km (0.075 R)
- M38: 14,342,247 km (0.117 R)
- M39: 14,461,776 km (0.056 R)
- M40: 14,702,030 km (0.06 R)
- M41: 15,984,981 km (0.065 R)
- M42: 16,295,846 km (0.058 R)
- M43: 16,734,167 km (0.082 R)
- M44: 17,558,601 km (0.093 R)
- M45: 18,461,125 km (0.048 R)
- M46: 18,787,099 km (0.06 R)
- M47: 18,852,473 km (0.083 R)
- M48: 20,243,883 km (0.118 R)
- M49: 20,378,222 km (0.119 R)
- M50: 21,736,720 km (0.108 R)
- M51: 23,616,866 km (0.077 R)
- M52: 24,397,618 km (0.105 R)
- M53: 25,331,258 km (0.045 R)
- M54: 26,643,082 km (0.055 R)
- M55: 29,256,706 km (0.083 R)
- M56: 29,484,394 km (0.069 R)
- M57: 30,248,091 km (0.102 R)
- M58: 32,028,755 km (0.04 R)
- M59: 32,263,623 km (0.111 R)
- M60: 32,892,533 km (0.087 R)
- M61: 33,446,045 km (0.058 R)
- M62: 33,525,332 km (0.116 R)
- M63: 34,002,698 km (0.117 R)
- M64: 34,562,494 km (0.07 R)
- M65: 36,259,831 km (0.088 R)
- M66: 36,341,362 km (0.113 R)
- M67: 37,159,662 km (0.093 R)
- M68: 37,818,791 km (0.107 R)
- M69: 38,398,632 km (0.102 R)
- M70: 39,064,941 km (0.102 R)
- M71: 39,819,064 km (0.047 R)
- M72: 41,597,483 km (0.053 R)
- M73: 42,281,594 km (0.102 R)
- M74: 42,453,333 km (0.11 R)
- M75: 42,625,220 km (0.107 R)
- M76: 43,228,549 km (0.069 R)
- M77: 43,574,569 km (0.088 R)
- M78: 44,008,552 km (0.082 R)
- M79: 44,531,097 km (0.106 R)
- M80: 44,705,678 km (0.035 R)
- M81: 44,793,043 km (0.107 R)
- M82: 45,406,544 km (0.118 R)
- M83: 45,494,358 km (0.041 R)
- M84: 47,085,481 km (0.089 R)
- M85: 48,066,843 km (0.091 R)
- M86: 48,425,280 km (0.109 R)
- M87: 48,694,855 km (0.088 R)
- M88: 48,784,763 km (0.11 R)
- M89: 50,686,003 km (0.111 R)
- M90: 51,691,599 km (0.113 R)
- M91: 60,065,939 km (0.049 R)
- M92: 60,936,000 km (0.102 R)
- M93: 65,943,938 km (0.085 R)
Kuiper Belt
Range: 30 - 55 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 181 - 13,315 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.