Star System Generated (Seed: 1768265454)
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 (8 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.51 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 741.5
Radius: 14
Gravity: 3.78 G
Time & Orbit
Eccentricity (e): 0.001
Orbit Range: 0.51 AU - 0.51 AU
Year: 243 Days
Day: 5.9 Hours
Environment
Temp: -147 °C
Axial Tilt: 17.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (31)
Outer Limit: 50,040,001 km
- M1: 185,352 km (0.115 R)
- M2: 293,511 km (0.047 R)
- M3: 392,395 km (0.036 R)
- M4: 488,736 km (0.11 R)
- M5: 601,683 km (0.118 R)
- M6: 719,566 km (0.085 R)
- M7: 807,529 km (0.103 R)
- M8: 899,831 km (0.104 R)
- M9: 1,003,203 km (0.082 R)
- M10: 1,111,213 km (0.051 R)
- M11: 1,212,042 km (0.086 R)
- M12: 1,335,909 km (0.07 R)
- M13: 1,526,048 km (0.049 R)
- M14: 1,622,539 km (0.05 R)
- M15: 1,716,785 km (0.115 R)
- M16: 1,808,788 km (0.087 R)
- M17: 2,016,131 km (0.096 R)
- M18: 2,141,643 km (0.087 R)
- M19: 2,241,126 km (0.085 R)
- M20: 2,459,838 km (0.059 R)
- M21: 2,639,954 km (0.096 R)
- M22: 2,772,797 km (0.11 R)
- M23: 2,887,089 km (0.106 R)
- M24: 3,066,906 km (0.043 R)
- M25: 3,163,546 km (0.098 R)
- M26: 3,426,689 km (0.103 R)
- M27: 3,532,754 km (0.094 R)
- M28: 3,674,124 km (0.068 R)
- M29: 3,788,716 km (0.107 R)
- M30: 3,956,864 km (0.053 R)
- M31: 4,062,480 km (0.115 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.62 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 109.8
Radius: 11.2
Gravity: 0.88 G
Time & Orbit
Eccentricity (e): 0.23
Orbit Range: 0.48 AU - 0.76 AU
Year: 326 Days
Day: 14 Hours
Environment
Temp: -151 °C
Axial Tilt: 5.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (25)
Outer Limit: 50,040,001 km
- M1: 142,567 km (0.083 R)
- M2: 222,452 km (0.055 R)
- M3: 295,755 km (0.105 R)
- M4: 381,325 km (0.088 R)
- M5: 530,025 km (0.086 R)
- M6: 642,373 km (0.059 R)
- M7: 719,267 km (0.041 R)
- M8: 873,502 km (0.09 R)
- M9: 999,463 km (0.036 R)
- M10: 1,074,412 km (0.075 R)
- M11: 1,159,683 km (0.073 R)
- M12: 1,264,850 km (0.064 R)
- M13: 1,343,538 km (0.112 R)
- M14: 1,491,042 km (0.049 R)
- M15: 1,574,817 km (0.12 R)
- M16: 1,799,363 km (0.103 R)
- M17: 1,875,359 km (0.072 R)
- M18: 1,966,165 km (0.094 R)
- M19: 2,058,616 km (0.098 R)
- M20: 2,176,948 km (0.089 R)
- M21: 2,261,920 km (0.102 R)
- M22: 2,351,679 km (0.111 R)
- M23: 2,424,383 km (0.101 R)
- M24: 2,527,456 km (0.101 R)
- M25: 2,643,394 km (0.088 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.64 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 38.7
Radius: 9.3
Gravity: 0.45 G
Time & Orbit
Eccentricity (e): 0.155
Orbit Range: 0.54 AU - 0.74 AU
Year: 341 Days
Day: 12.9 Hours
Environment
Temp: -146 °C
Axial Tilt: 26.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (20)
Outer Limit: 50,040,001 km
- M1: 115,789 km (0.102 R)
- M2: 183,856 km (0.066 R)
- M3: 285,882 km (0.108 R)
- M4: 344,524 km (0.095 R)
- M5: 445,054 km (0.08 R)
- M6: 555,606 km (0.069 R)
- M7: 619,934 km (0.055 R)
- M8: 730,337 km (0.074 R)
- M9: 907,161 km (0.045 R)
- M10: 1,019,210 km (0.113 R)
- M11: 1,098,198 km (0.114 R)
- M12: 1,186,162 km (0.051 R)
- M13: 1,316,760 km (0.077 R)
- M14: 1,386,323 km (0.105 R)
- M15: 1,454,839 km (0.111 R)
- M16: 1,544,448 km (0.098 R)
- M17: 1,615,507 km (0.1 R)
- M18: 1,758,523 km (0.099 R)
- M19: 1,816,866 km (0.036 R)
- M20: 1,889,421 km (0.108 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.27 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 700.4
Radius: 11.3
Gravity: 5.49 G
Time & Orbit
Eccentricity (e): 0.11
Orbit Range: 1.13 AU - 1.41 AU
Year: 954 Days
Day: 14.7 Hours
Environment
Temp: -187 °C
Axial Tilt: 2.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (58)
Outer Limit: 50,040,001 km
- M1: 142,118 km (0.094 R)
- M2: 251,773 km (0.107 R)
- M3: 365,617 km (0.118 R)
- M4: 533,466 km (0.071 R)
- M5: 667,057 km (0.106 R)
- M6: 747,391 km (0.106 R)
- M7: 880,982 km (0.051 R)
- M8: 964,158 km (0.083 R)
- M9: 1,104,331 km (0.091 R)
- M10: 1,280,707 km (0.12 R)
- M11: 1,436,140 km (0.084 R)
- M12: 1,566,888 km (0.06 R)
- M13: 1,685,519 km (0.108 R)
- M14: 1,782,758 km (0.108 R)
- M15: 1,865,336 km (0.071 R)
- M16: 1,940,733 km (0.064 R)
- M17: 2,164,532 km (0.075 R)
- M18: 2,442,484 km (0.11 R)
- M19: 2,599,861 km (0.106 R)
- M20: 2,684,683 km (0.086 R)
- M21: 2,789,551 km (0.081 R)
- M22: 2,866,744 km (0.075 R)
- M23: 2,954,408 km (0.107 R)
- M24: 3,202,741 km (0.082 R)
- M25: 3,344,859 km (0.042 R)
- M26: 3,530,659 km (0.093 R)
- M27: 3,635,378 km (0.07 R)
- M28: 3,741,144 km (0.105 R)
- M29: 3,847,956 km (0.083 R)
- M30: 4,010,121 km (0.101 R)
- M31: 4,097,635 km (0.113 R)
- M32: 4,442,608 km (0.078 R)
- M33: 4,555,854 km (0.115 R)
- M34: 4,635,739 km (0.05 R)
- M35: 4,866,718 km (0.081 R)
- M36: 5,125,073 km (0.048 R)
- M37: 5,196,282 km (0.105 R)
- M38: 5,877,551 km (0.108 R)
- M39: 6,304,802 km (0.086 R)
- M40: 6,445,275 km (0.03 R)
- M41: 6,548,048 km (0.097 R)
- M42: 6,638,406 km (0.111 R)
- M43: 6,729,211 km (0.071 R)
- M44: 7,004,172 km (0.044 R)
- M45: 7,083,459 km (0.053 R)
- M46: 7,163,045 km (0.062 R)
- M47: 7,256,245 km (0.088 R)
- M48: 7,470,768 km (0.102 R)
- M49: 7,565,314 km (0.088 R)
- M50: 7,864,958 km (0.084 R)
- M51: 8,099,229 km (0.056 R)
- M52: 8,405,904 km (0.113 R)
- M53: 8,787,379 km (0.054 R)
- M54: 8,872,949 km (0.081 R)
- M55: 9,044,986 km (0.087 R)
- M56: 9,218,071 km (0.048 R)
- M57: 9,406,714 km (0.09 R)
- M58: 9,906,521 km (0.118 R)
Planet 5 - Gas Giant
Semi-Major Axis: 1.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 521.9
Radius: 10.7
Gravity: 4.56 G
Time & Orbit
Eccentricity (e): 0.222
Orbit Range: 1.04 AU - 1.64 AU
Year: 1034 Days
Day: 8.8 Hours
Environment
Temp: -192 °C
Axial Tilt: 18.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (55)
Outer Limit: 50,040,001 km
- M1: 134,638 km (0.031 R)
- M2: 214,972 km (0.079 R)
- M3: 294,409 km (0.075 R)
- M4: 377,136 km (0.1 R)
- M5: 465,997 km (0.085 R)
- M6: 584,180 km (0.098 R)
- M7: 730,636 km (0.039 R)
- M8: 853,605 km (0.034 R)
- M9: 1,016,069 km (0.115 R)
- M10: 1,216,829 km (0.113 R)
- M11: 1,365,380 km (0.107 R)
- M12: 1,580,651 km (0.09 R)
- M13: 1,657,395 km (0.034 R)
- M14: 1,727,706 km (0.062 R)
- M15: 2,188,018 km (0.091 R)
- M16: 2,291,690 km (0.112 R)
- M17: 2,530,897 km (0.08 R)
- M18: 2,713,406 km (0.1 R)
- M19: 2,843,856 km (0.048 R)
- M20: 2,928,827 km (0.118 R)
- M21: 3,082,015 km (0.062 R)
- M22: 3,267,367 km (0.034 R)
- M23: 3,336,631 km (0.106 R)
- M24: 3,845,563 km (0.059 R)
- M25: 3,929,338 km (0.099 R)
- M26: 4,109,304 km (0.105 R)
- M27: 4,335,496 km (0.033 R)
- M28: 4,587,867 km (0.051 R)
- M29: 4,654,588 km (0.044 R)
- M30: 4,766,338 km (0.117 R)
- M31: 4,890,504 km (0.086 R)
- M32: 5,118,790 km (0.087 R)
- M33: 5,420,978 km (0.094 R)
- M34: 5,597,803 km (0.096 R)
- M35: 5,824,743 km (0.059 R)
- M36: 5,909,265 km (0.089 R)
- M37: 6,066,942 km (0.114 R)
- M38: 6,201,580 km (0.045 R)
- M39: 6,424,032 km (0.107 R)
- M40: 6,523,814 km (0.08 R)
- M41: 6,813,435 km (0.1 R)
- M42: 7,158,857 km (0.089 R)
- M43: 7,249,214 km (0.093 R)
- M44: 7,340,169 km (0.099 R)
- M45: 7,431,424 km (0.1 R)
- M46: 7,536,142 km (0.079 R)
- M47: 7,880,068 km (0.076 R)
- M48: 7,960,103 km (0.094 R)
- M49: 8,175,075 km (0.052 R)
- M50: 8,624,467 km (0.076 R)
- M51: 8,762,246 km (0.078 R)
- M52: 8,859,036 km (0.093 R)
- M53: 8,942,362 km (0.081 R)
- M54: 9,250,235 km (0.072 R)
- M55: 9,518,763 km (0.096 R)
Planet 6 - Gas Giant
Semi-Major Axis: 1.43 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 725.1
Radius: 11
Gravity: 5.99 G
Time & Orbit
Eccentricity (e): 0.202
Orbit Range: 1.14 AU - 1.72 AU
Year: 1140 Days
Day: 14 Hours
Environment
Temp: -197 °C
Axial Tilt: 22.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (59)
Outer Limit: 50,040,001 km
- M1: 137,181 km (0.068 R)
- M2: 211,083 km (0.101 R)
- M3: 283,189 km (0.064 R)
- M4: 428,000 km (0.075 R)
- M5: 539,600 km (0.085 R)
- M6: 644,468 km (0.096 R)
- M7: 809,474 km (0.113 R)
- M8: 932,444 km (0.116 R)
- M9: 1,069,475 km (0.075 R)
- M10: 1,144,424 km (0.102 R)
- M11: 1,268,291 km (0.034 R)
- M12: 1,348,176 km (0.12 R)
- M13: 1,421,629 km (0.077 R)
- M14: 1,572,722 km (0.119 R)
- M15: 1,809,536 km (0.09 R)
- M16: 2,039,318 km (0.09 R)
- M17: 2,124,439 km (0.111 R)
- M18: 2,220,481 km (0.108 R)
- M19: 2,298,272 km (0.104 R)
- M20: 2,446,972 km (0.099 R)
- M21: 2,537,629 km (0.046 R)
- M22: 2,650,126 km (0.071 R)
- M23: 2,785,213 km (0.092 R)
- M24: 3,008,264 km (0.099 R)
- M25: 3,193,316 km (0.116 R)
- M26: 3,393,329 km (0.097 R)
- M27: 3,517,644 km (0.095 R)
- M28: 3,724,389 km (0.119 R)
- M29: 4,222,250 km (0.093 R)
- M30: 4,454,576 km (0.114 R)
- M31: 5,047,133 km (0.036 R)
- M32: 5,176,535 km (0.073 R)
- M33: 5,478,274 km (0.064 R)
- M34: 5,651,209 km (0.075 R)
- M35: 5,772,234 km (0.091 R)
- M36: 5,961,924 km (0.082 R)
- M37: 6,112,569 km (0.105 R)
- M38: 6,305,999 km (0.072 R)
- M39: 6,389,624 km (0.081 R)
- M40: 6,529,648 km (0.118 R)
- M41: 6,684,930 km (0.071 R)
- M42: 6,999,236 km (0.042 R)
- M43: 7,216,302 km (0.076 R)
- M44: 7,362,310 km (0.104 R)
- M45: 7,880,965 km (0.111 R)
- M46: 8,152,336 km (0.117 R)
- M47: 8,258,700 km (0.109 R)
- M48: 8,442,107 km (0.098 R)
- M49: 8,580,635 km (0.039 R)
- M50: 8,704,352 km (0.057 R)
- M51: 9,427,209 km (0.091 R)
- M52: 9,522,952 km (0.066 R)
- M53: 9,731,491 km (0.083 R)
- M54: 9,892,907 km (0.081 R)
- M55: 9,990,146 km (0.052 R)
- M56: 10,780,023 km (0.093 R)
- M57: 11,199,345 km (0.093 R)
- M58: 11,283,719 km (0.087 R)
- M59: 11,385,445 km (0.056 R)
Planet 7 - Gas Giant
Semi-Major Axis: 3.99 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 469.2
Radius: 10.2
Gravity: 4.51 G
Time & Orbit
Eccentricity (e): 0.124
Orbit Range: 3.5 AU - 4.48 AU
Year: 5315 Days
Day: 6.6 Hours
Environment
Temp: -212 °C
Axial Tilt: 35.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (80)
Outer Limit: 50,040,001 km
- M1: 146,606 km (0.115 R)
- M2: 229,483 km (0.044 R)
- M3: 347,665 km (0.114 R)
- M4: 463,604 km (0.113 R)
- M5: 542,591 km (0.114 R)
- M6: 626,965 km (0.056 R)
- M7: 947,703 km (0.117 R)
- M8: 1,361,191 km (0.096 R)
- M9: 1,435,392 km (0.048 R)
- M10: 2,044,105 km (0.039 R)
- M11: 2,199,238 km (0.091 R)
- M12: 2,897,262 km (0.112 R)
- M13: 3,072,142 km (0.085 R)
- M14: 3,290,704 km (0.088 R)
- M15: 3,494,008 km (0.117 R)
- M16: 3,576,436 km (0.025 R)
- M17: 3,659,613 km (0.045 R)
- M18: 3,785,425 km (0.093 R)
- M19: 4,150,144 km (0.111 R)
- M20: 4,303,632 km (0.072 R)
- M21: 4,436,624 km (0.118 R)
- M22: 4,843,979 km (0.096 R)
- M23: 5,029,032 km (0.028 R)
- M24: 5,122,381 km (0.054 R)
- M25: 5,239,965 km (0.111 R)
- M26: 5,792,130 km (0.061 R)
- M27: 5,865,583 km (0.119 R)
- M28: 6,137,402 km (0.098 R)
- M29: 6,388,278 km (0.079 R)
- M30: 6,977,843 km (0.1 R)
- M31: 7,082,113 km (0.102 R)
- M32: 7,398,213 km (0.03 R)
- M33: 7,504,727 km (0.071 R)
- M34: 7,962,646 km (0.057 R)
- M35: 8,099,079 km (0.12 R)
- M36: 8,374,339 km (0.106 R)
- M37: 8,485,191 km (0.087 R)
- M38: 8,708,541 km (0.037 R)
- M39: 8,792,914 km (0.113 R)
- M40: 9,132,651 km (0.082 R)
- M41: 9,971,745 km (0.075 R)
- M42: 10,296,373 km (0.106 R)
- M43: 11,444,686 km (0.091 R)
- M44: 11,598,921 km (0.086 R)
- M45: 12,856,591 km (0.049 R)
- M46: 13,081,137 km (0.033 R)
- M47: 13,209,941 km (0.058 R)
- M48: 13,274,567 km (0.097 R)
- M49: 14,555,424 km (0.093 R)
- M50: 15,499,237 km (0.091 R)
- M51: 15,841,068 km (0.102 R)
- M52: 16,289,114 km (0.108 R)
- M53: 16,358,527 km (0.111 R)
- M54: 16,671,636 km (0.11 R)
- M55: 17,233,226 km (0.056 R)
- M56: 17,480,960 km (0.077 R)
- M57: 18,015,623 km (0.077 R)
- M58: 18,447,213 km (0.092 R)
- M59: 18,809,539 km (0.116 R)
- M60: 19,284,063 km (0.089 R)
- M61: 19,357,366 km (0.088 R)
- M62: 19,651,625 km (0.102 R)
- M63: 19,873,479 km (0.066 R)
- M64: 20,581,077 km (0.11 R)
- M65: 21,296,902 km (0.109 R)
- M66: 21,791,473 km (0.108 R)
- M67: 22,559,658 km (0.113 R)
- M68: 22,675,746 km (0.095 R)
- M69: 22,791,834 km (0.115 R)
- M70: 23,180,639 km (0.092 R)
- M71: 23,258,729 km (0.061 R)
- M72: 23,454,104 km (0.045 R)
- M73: 23,767,960 km (0.109 R)
- M74: 23,964,681 km (0.101 R)
- M75: 24,558,585 km (0.111 R)
- M76: 25,317,644 km (0.12 R)
- M77: 26,287,487 km (0.107 R)
- M78: 26,654,301 km (0.082 R)
- M79: 26,940,781 km (0.105 R)
- M80: 27,434,305 km (0.106 R)
Planet 8 - Ice Giant
Semi-Major Axis: 7.81 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 367.9
Radius: 4.5
Gravity: 18.17 G
Time & Orbit
Eccentricity (e): 0.2
Orbit Range: 6.25 AU - 9.37 AU
Year: 14555 Days
Day: 21 Hours
Environment
Temp: -241 °C
Axial Tilt: 38.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (77)
Outer Limit: 50,040,001 km
- M1: 64,177 km (0.09 R)
- M2: 426,204 km (0.084 R)
- M3: 517,309 km (0.065 R)
- M4: 614,847 km (0.109 R)
- M5: 790,625 km (0.087 R)
- M6: 884,273 km (0.105 R)
- M7: 922,869 km (0.09 R)
- M8: 981,661 km (0.12 R)
- M9: 1,229,694 km (0.115 R)
- M10: 1,383,032 km (0.054 R)
- M11: 1,496,428 km (0.107 R)
- M12: 1,542,653 km (0.109 R)
- M13: 1,636,601 km (0.108 R)
- M14: 1,805,497 km (0.062 R)
- M15: 2,030,791 km (0.11 R)
- M16: 2,082,103 km (0.105 R)
- M17: 2,646,237 km (0.094 R)
- M18: 2,702,336 km (0.084 R)
- M19: 2,930,772 km (0.102 R)
- M20: 3,076,630 km (0.094 R)
- M21: 3,285,020 km (0.073 R)
- M22: 3,315,089 km (0.116 R)
- M23: 4,065,621 km (0.066 R)
- M24: 4,130,397 km (0.087 R)
- M25: 4,560,192 km (0.049 R)
- M26: 4,627,661 km (0.109 R)
- M27: 5,108,618 km (0.069 R)
- M28: 6,080,405 km (0.046 R)
- M29: 7,264,173 km (0.1 R)
- M30: 8,558,345 km (0.074 R)
- M31: 8,850,808 km (0.117 R)
- M32: 9,531,479 km (0.07 R)
- M33: 9,747,648 km (0.081 R)
- M34: 9,834,564 km (0.12 R)
- M35: 10,273,035 km (0.119 R)
- M36: 10,942,635 km (0.092 R)
- M37: 11,626,298 km (0.106 R)
- M38: 13,856,054 km (0.102 R)
- M39: 13,904,823 km (0.04 R)
- M40: 14,545,102 km (0.113 R)
- M41: 14,694,251 km (0.06 R)
- M42: 16,678,367 km (0.026 R)
- M43: 18,314,370 km (0.047 R)
- M44: 18,690,758 km (0.118 R)
- M45: 19,069,839 km (0.081 R)
- M46: 19,670,474 km (0.061 R)
- M47: 20,388,395 km (0.104 R)
- M48: 21,792,969 km (0.091 R)
- M49: 22,191,797 km (0.107 R)
- M50: 22,938,889 km (0.054 R)
- M51: 23,460,836 km (0.11 R)
- M52: 23,928,179 km (0.059 R)
- M53: 24,163,048 km (0.082 R)
- M54: 28,393,825 km (0.077 R)
- M55: 28,954,219 km (0.112 R)
- M56: 29,392,541 km (0.032 R)
- M57: 29,643,865 km (0.077 R)
- M58: 29,896,087 km (0.106 R)
- M59: 30,466,055 km (0.107 R)
- M60: 30,720,521 km (0.108 R)
- M61: 32,651,530 km (0.088 R)
- M62: 32,716,606 km (0.115 R)
- M63: 32,911,980 km (0.087 R)
- M64: 33,173,029 km (0.111 R)
- M65: 33,828,716 km (0.102 R)
- M66: 34,422,620 km (0.077 R)
- M67: 34,820,400 km (0.052 R)
- M68: 36,426,932 km (0.052 R)
- M69: 36,899,960 km (0.114 R)
- M70: 37,715,718 km (0.044 R)
- M71: 37,920,517 km (0.058 R)
- M72: 37,988,883 km (0.119 R)
- M73: 39,850,330 km (0.053 R)
- M74: 42,448,845 km (0.079 R)
- M75: 42,733,081 km (0.066 R)
- M76: 44,884,597 km (0.118 R)
- M77: 45,682,253 km (0.081 R)
Kuiper Belt
Range: 30 - 58 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 429 - 14,194 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.