Star System Generated (Seed: 1766592971)
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: 0.54 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 676.8
Radius: 8.4
Gravity: 9.59 G
Time & Orbit
Eccentricity (e): 0.019
Orbit Range: 0.53 AU - 0.55 AU
Year: 269 Days
Day: 13.3 Hours
Environment
Temp: -143 °C
Axial Tilt: 1.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (39)
Outer Limit: 26,693,517 km
- M1: 124,017 km (0.081 R)
- M2: 181,911 km (0.119 R)
- M3: 242,797 km (0.096 R)
- M4: 296,054 km (0.118 R)
- M5: 450,888 km (0.111 R)
- M6: 533,167 km (0.109 R)
- M7: 639,980 km (0.094 R)
- M8: 727,494 km (0.076 R)
- M9: 791,822 km (0.104 R)
- M10: 897,438 km (0.077 R)
- M11: 1,019,360 km (0.081 R)
- M12: 1,103,733 km (0.067 R)
- M13: 1,162,675 km (0.09 R)
- M14: 1,259,315 km (0.114 R)
- M15: 1,312,871 km (0.087 R)
- M16: 1,478,177 km (0.046 R)
- M17: 1,539,212 km (0.103 R)
- M18: 1,673,103 km (0.09 R)
- M19: 1,741,319 km (0.103 R)
- M20: 1,820,008 km (0.096 R)
- M21: 1,885,681 km (0.051 R)
- M22: 2,107,236 km (0.053 R)
- M23: 2,296,627 km (0.092 R)
- M24: 2,398,503 km (0.101 R)
- M25: 2,554,384 km (0.089 R)
- M26: 2,751,105 km (0.088 R)
- M27: 2,816,030 km (0.066 R)
- M28: 2,870,484 km (0.088 R)
- M29: 3,002,728 km (0.119 R)
- M30: 3,170,876 km (0.109 R)
- M31: 3,239,093 km (0.036 R)
- M32: 3,296,239 km (0.047 R)
- M33: 3,365,204 km (0.055 R)
- M34: 3,534,100 km (0.117 R)
- M35: 3,616,678 km (0.105 R)
- M36: 3,753,710 km (0.11 R)
- M37: 4,088,360 km (0.119 R)
- M38: 4,162,710 km (0.112 R)
- M39: 4,231,226 km (0.076 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.93 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 298.2
Radius: 11.9
Gravity: 2.11 G
Time & Orbit
Eccentricity (e): 0.098
Orbit Range: 0.84 AU - 1.02 AU
Year: 608 Days
Day: 5.9 Hours
Environment
Temp: -168 °C
Axial Tilt: 48.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (31)
Outer Limit: 26,693,517 km
- M1: 154,235 km (0.111 R)
- M2: 242,797 km (0.055 R)
- M3: 318,344 km (0.06 R)
- M4: 468,989 km (0.103 R)
- M5: 548,575 km (0.042 R)
- M6: 755,320 km (0.082 R)
- M7: 869,164 km (0.062 R)
- M8: 1,011,282 km (0.107 R)
- M9: 1,349,522 km (0.12 R)
- M10: 1,579,006 km (0.115 R)
- M11: 1,695,991 km (0.077 R)
- M12: 1,793,978 km (0.049 R)
- M13: 2,036,027 km (0.111 R)
- M14: 2,337,018 km (0.052 R)
- M15: 2,459,090 km (0.1 R)
- M16: 2,620,955 km (0.094 R)
- M17: 2,716,099 km (0.116 R)
- M18: 3,041,474 km (0.094 R)
- M19: 3,168,483 km (0.076 R)
- M20: 3,242,833 km (0.046 R)
- M21: 3,379,565 km (0.106 R)
- M22: 3,469,474 km (0.072 R)
- M23: 3,553,249 km (0.068 R)
- M24: 3,909,441 km (0.111 R)
- M25: 4,004,137 km (0.072 R)
- M26: 4,255,012 km (0.101 R)
- M27: 4,556,901 km (0.094 R)
- M28: 4,944,210 km (0.112 R)
- M29: 5,062,542 km (0.108 R)
- M30: 5,269,884 km (0.065 R)
- M31: 5,594,212 km (0.099 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.85 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 908.6
Radius: 12.3
Gravity: 6.01 G
Time & Orbit
Eccentricity (e): 0.145
Orbit Range: 1.58 AU - 2.12 AU
Year: 1707 Days
Day: 8.8 Hours
Environment
Temp: -197 °C
Axial Tilt: 23.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (61)
Outer Limit: 26,693,517 km
- M1: 188,493 km (0.118 R)
- M2: 321,785 km (0.115 R)
- M3: 425,157 km (0.109 R)
- M4: 586,274 km (0.11 R)
- M5: 862,282 km (0.042 R)
- M6: 1,348,176 km (0.042 R)
- M7: 1,567,187 km (0.1 R)
- M8: 2,004,911 km (0.094 R)
- M9: 2,147,328 km (0.105 R)
- M10: 2,280,919 km (0.088 R)
- M11: 2,803,614 km (0.052 R)
- M12: 2,936,756 km (0.034 R)
- M13: 3,113,132 km (0.112 R)
- M14: 3,321,073 km (0.104 R)
- M15: 3,987,382 km (0.076 R)
- M16: 4,092,399 km (0.104 R)
- M17: 4,366,911 km (0.047 R)
- M18: 4,475,220 km (0.076 R)
- M19: 4,631,700 km (0.076 R)
- M20: 4,837,696 km (0.057 R)
- M21: 4,982,207 km (0.115 R)
- M22: 5,324,936 km (0.105 R)
- M23: 5,457,480 km (0.071 R)
- M24: 6,171,810 km (0.082 R)
- M25: 6,328,738 km (0.115 R)
- M26: 6,540,120 km (0.095 R)
- M27: 6,717,992 km (0.082 R)
- M28: 6,879,408 km (0.108 R)
- M29: 6,987,866 km (0.044 R)
- M30: 7,334,933 km (0.059 R)
- M31: 7,445,636 km (0.106 R)
- M32: 7,706,385 km (0.113 R)
- M33: 8,064,971 km (0.049 R)
- M34: 8,217,561 km (0.097 R)
- M35: 8,371,198 km (0.083 R)
- M36: 8,506,434 km (0.119 R)
- M37: 8,642,269 km (0.07 R)
- M38: 8,995,170 km (0.092 R)
- M39: 9,292,870 km (0.082 R)
- M40: 9,816,612 km (0.098 R)
- M41: 10,123,138 km (0.095 R)
- M42: 10,246,706 km (0.101 R)
- M43: 10,474,394 km (0.091 R)
- M44: 10,703,877 km (0.065 R)
- M45: 10,913,913 km (0.114 R)
- M46: 11,210,266 km (0.097 R)
- M47: 11,295,387 km (0.103 R)
- M48: 11,380,808 km (0.098 R)
- M49: 11,466,378 km (0.071 R)
- M50: 12,466,290 km (0.111 R)
- M51: 12,554,553 km (0.067 R)
- M52: 12,753,817 km (0.076 R)
- M53: 12,842,828 km (0.118 R)
- M54: 12,999,008 km (0.069 R)
- M55: 13,448,699 km (0.116 R)
- M56: 13,630,012 km (0.055 R)
- M57: 14,201,775 km (0.099 R)
- M58: 14,711,455 km (0.038 R)
- M59: 15,038,924 km (0.115 R)
- M60: 15,534,692 km (0.1 R)
- M61: 15,677,408 km (0.049 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.18 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 761.8
Radius: 11.1
Gravity: 6.18 G
Time & Orbit
Eccentricity (e): 0.111
Orbit Range: 1.94 AU - 2.42 AU
Year: 2183 Days
Day: 7 Hours
Environment
Temp: -196 °C
Axial Tilt: 35.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (70)
Outer Limit: 26,693,517 km
- M1: 139,575 km (0.03 R)
- M2: 308,620 km (0.039 R)
- M3: 461,809 km (0.077 R)
- M4: 565,330 km (0.042 R)
- M5: 686,205 km (0.056 R)
- M6: 975,528 km (0.038 R)
- M7: 1,094,159 km (0.107 R)
- M8: 1,217,876 km (0.072 R)
- M9: 1,479,822 km (0.103 R)
- M10: 1,559,707 km (0.069 R)
- M11: 1,664,725 km (0.096 R)
- M12: 2,096,016 km (0.09 R)
- M13: 2,465,971 km (0.034 R)
- M14: 2,658,653 km (0.077 R)
- M15: 2,856,571 km (0.112 R)
- M16: 3,044,616 km (0.074 R)
- M17: 3,118,068 km (0.08 R)
- M18: 3,296,838 km (0.099 R)
- M19: 3,387,494 km (0.092 R)
- M20: 3,586,908 km (0.103 R)
- M21: 3,695,965 km (0.061 R)
- M22: 3,901,363 km (0.099 R)
- M23: 3,997,405 km (0.11 R)
- M24: 4,191,882 km (0.086 R)
- M25: 4,306,923 km (0.092 R)
- M26: 4,863,128 km (0.082 R)
- M27: 4,949,296 km (0.116 R)
- M28: 5,123,428 km (0.048 R)
- M29: 5,211,242 km (0.05 R)
- M30: 5,335,109 km (0.032 R)
- M31: 5,424,120 km (0.108 R)
- M32: 5,913,604 km (0.099 R)
- M33: 6,005,756 km (0.077 R)
- M34: 6,304,054 km (0.112 R)
- M35: 6,607,289 km (0.086 R)
- M36: 6,954,207 km (0.047 R)
- M37: 7,465,682 km (0.115 R)
- M38: 7,565,464 km (0.102 R)
- M39: 7,908,192 km (0.111 R)
- M40: 8,132,589 km (0.059 R)
- M41: 8,671,441 km (0.058 R)
- M42: 8,945,205 km (0.117 R)
- M43: 9,221,811 km (0.108 R)
- M44: 9,479,718 km (0.104 R)
- M45: 9,740,018 km (0.086 R)
- M46: 10,068,685 km (0.093 R)
- M47: 10,737,088 km (0.106 R)
- M48: 10,940,391 km (0.037 R)
- M49: 11,122,153 km (0.088 R)
- M50: 11,259,185 km (0.044 R)
- M51: 12,093,043 km (0.094 R)
- M52: 12,281,088 km (0.051 R)
- M53: 12,399,120 km (0.068 R)
- M54: 12,517,452 km (0.06 R)
- M55: 13,284,141 km (0.096 R)
- M56: 13,453,785 km (0.101 R)
- M57: 13,575,558 km (0.051 R)
- M58: 13,673,096 km (0.092 R)
- M59: 13,991,889 km (0.088 R)
- M60: 14,412,558 km (0.11 R)
- M61: 14,512,190 km (0.064 R)
- M62: 14,988,360 km (0.075 R)
- M63: 15,495,198 km (0.088 R)
- M64: 15,648,386 km (0.086 R)
- M65: 15,725,130 km (0.11 R)
- M66: 16,033,451 km (0.084 R)
- M67: 16,369,747 km (0.045 R)
- M68: 17,181,016 km (0.076 R)
- M69: 17,684,712 km (0.082 R)
- M70: 17,818,004 km (0.113 R)
Planet 5 - Gas Giant
Semi-Major Axis: 3.86 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 97.8
Radius: 13.4
Gravity: 0.54 G
Time & Orbit
Eccentricity (e): 0.141
Orbit Range: 3.32 AU - 4.4 AU
Year: 5144 Days
Day: 11.6 Hours
Environment
Temp: -225 °C
Axial Tilt: 23.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (56)
Outer Limit: 26,693,517 km
- M1: 178,021 km (0.082 R)
- M2: 303,684 km (0.105 R)
- M3: 442,660 km (0.032 R)
- M4: 533,616 km (0.083 R)
- M5: 836,551 km (0.112 R)
- M6: 1,175,690 km (0.112 R)
- M7: 1,262,606 km (0.094 R)
- M8: 1,402,480 km (0.089 R)
- M9: 1,526,646 km (0.091 R)
- M10: 1,720,226 km (0.04 R)
- M11: 1,899,444 km (0.115 R)
- M12: 2,061,459 km (0.079 R)
- M13: 2,626,639 km (0.116 R)
- M14: 2,768,907 km (0.094 R)
- M15: 3,061,371 km (0.118 R)
- M16: 3,183,891 km (0.088 R)
- M17: 3,336,033 km (0.054 R)
- M18: 3,939,211 km (0.109 R)
- M19: 4,437,222 km (0.084 R)
- M20: 4,796,257 km (0.09 R)
- M21: 5,229,792 km (0.115 R)
- M22: 5,692,947 km (0.035 R)
- M23: 5,912,407 km (0.106 R)
- M24: 6,238,530 km (0.109 R)
- M25: 6,587,991 km (0.099 R)
- M26: 6,694,206 km (0.029 R)
- M27: 6,836,623 km (0.101 R)
- M28: 7,052,193 km (0.101 R)
- M29: 7,361,412 km (0.07 R)
- M30: 7,600,918 km (0.03 R)
- M31: 7,768,169 km (0.098 R)
- M32: 8,144,407 km (0.104 R)
- M33: 8,430,588 km (0.079 R)
- M34: 8,584,674 km (0.101 R)
- M35: 9,131,005 km (0.09 R)
- M36: 9,608,222 km (0.118 R)
- M37: 9,748,994 km (0.107 R)
- M38: 10,298,467 km (0.099 R)
- M39: 10,962,682 km (0.061 R)
- M40: 11,300,174 km (0.049 R)
- M41: 11,769,612 km (0.101 R)
- M42: 11,941,949 km (0.113 R)
- M43: 12,398,223 km (0.119 R)
- M44: 12,507,728 km (0.119 R)
- M45: 12,617,533 km (0.104 R)
- M46: 13,015,613 km (0.103 R)
- M47: 13,104,624 km (0.077 R)
- M48: 13,395,442 km (0.102 R)
- M49: 13,530,379 km (0.069 R)
- M50: 13,710,944 km (0.087 R)
- M51: 13,846,929 km (0.112 R)
- M52: 14,188,760 km (0.101 R)
- M53: 14,326,390 km (0.111 R)
- M54: 15,325,105 km (0.104 R)
- M55: 15,442,689 km (0.087 R)
- M56: 15,844,808 km (0.099 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.61 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 782.2
Radius: 11
Gravity: 6.46 G
Time & Orbit
Eccentricity (e): 0.002
Orbit Range: 5.6 AU - 5.62 AU
Year: 9012 Days
Day: 13.8 Hours
Environment
Temp: -233 °C
Axial Tilt: 34.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (83)
Outer Limit: 26,693,517 km
- M1: 268,678 km (0.102 R)
- M2: 355,145 km (0.042 R)
- M3: 537,954 km (0.076 R)
- M4: 821,741 km (0.118 R)
- M5: 891,454 km (0.113 R)
- M6: 1,271,432 km (0.053 R)
- M7: 1,930,710 km (0.09 R)
- M8: 2,423,037 km (0.065 R)
- M9: 2,763,671 km (0.041 R)
- M10: 3,175,813 km (0.116 R)
- M11: 3,461,545 km (0.063 R)
- M12: 3,815,494 km (0.077 R)
- M13: 4,243,194 km (0.103 R)
- M14: 4,848,168 km (0.117 R)
- M15: 5,651,060 km (0.071 R)
- M16: 7,453,265 km (0.098 R)
- M17: 8,298,493 km (0.083 R)
- M18: 8,892,097 km (0.056 R)
- M19: 10,120,296 km (0.107 R)
- M20: 10,246,108 km (0.041 R)
- M21: 10,968,516 km (0.072 R)
- M22: 11,054,535 km (0.071 R)
- M23: 11,140,853 km (0.057 R)
- M24: 11,270,853 km (0.09 R)
- M25: 11,883,606 km (0.027 R)
- M26: 12,060,730 km (0.096 R)
- M27: 12,372,641 km (0.118 R)
- M28: 12,642,217 km (0.119 R)
- M29: 12,868,409 km (0.083 R)
- M30: 13,095,947 km (0.098 R)
- M31: 13,232,979 km (0.067 R)
- M32: 13,370,609 km (0.032 R)
- M33: 14,112,614 km (0.109 R)
- M34: 14,441,430 km (0.115 R)
- M35: 14,772,790 km (0.091 R)
- M36: 16,025,522 km (0.102 R)
- M37: 17,012,270 km (0.104 R)
- M38: 18,171,205 km (0.103 R)
- M39: 19,720,889 km (0.107 R)
- M40: 19,825,757 km (0.107 R)
- M41: 19,930,775 km (0.099 R)
- M42: 20,088,600 km (0.052 R)
- M43: 20,458,556 km (0.09 R)
- M44: 20,670,985 km (0.083 R)
- M45: 20,990,975 km (0.062 R)
- M46: 21,690,046 km (0.042 R)
- M47: 22,015,122 km (0.054 R)
- M48: 23,276,681 km (0.093 R)
- M49: 23,609,686 km (0.095 R)
- M50: 23,832,437 km (0.116 R)
- M51: 24,167,985 km (0.102 R)
- M52: 24,392,681 km (0.096 R)
- M53: 24,957,114 km (0.114 R)
- M54: 25,984,103 km (0.12 R)
- M55: 26,214,184 km (0.079 R)
- M56: 26,734,486 km (0.074 R)
- M57: 27,550,393 km (0.102 R)
- M58: 28,256,345 km (0.101 R)
- M59: 28,374,527 km (0.053 R)
- M60: 28,492,859 km (0.116 R)
- M61: 28,968,132 km (0.086 R)
- M62: 29,147,051 km (0.051 R)
- M63: 29,625,914 km (0.06 R)
- M64: 29,866,317 km (0.092 R)
- M65: 30,895,251 km (0.06 R)
- M66: 31,261,168 km (0.097 R)
- M67: 31,383,389 km (0.119 R)
- M68: 31,567,245 km (0.083 R)
- M69: 31,935,705 km (0.059 R)
- M70: 32,058,973 km (0.027 R)
- M71: 32,925,594 km (0.084 R)
- M72: 34,555,463 km (0.086 R)
- M73: 34,681,873 km (0.083 R)
- M74: 35,189,309 km (0.109 R)
- M75: 36,083,156 km (0.085 R)
- M76: 37,567,765 km (0.057 R)
- M77: 38,023,590 km (0.07 R)
- M78: 38,940,625 km (0.038 R)
- M79: 40,930,426 km (0.082 R)
- M80: 42,207,543 km (0.11 R)
- M81: 42,885,072 km (0.031 R)
- M82: 43,839,506 km (0.088 R)
- M83: 45,422,701 km (0.077 R)
Planet 7 - Ice Giant
Semi-Major Axis: 7.33 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 65.3
Radius: 7.8
Gravity: 1.07 G
Time & Orbit
Eccentricity (e): 0.029
Orbit Range: 7.12 AU - 7.54 AU
Year: 13460 Days
Day: 15.3 Hours
Environment
Temp: -229 °C
Axial Tilt: 24.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (75)
Outer Limit: 26,693,517 km
- M1: 136,433 km (0.112 R)
- M2: 221,554 km (0.107 R)
- M3: 421,567 km (0.11 R)
- M4: 610,808 km (0.084 R)
- M5: 744,549 km (0.102 R)
- M6: 888,163 km (0.108 R)
- M7: 1,300,753 km (0.085 R)
- M8: 1,387,071 km (0.095 R)
- M9: 1,783,207 km (0.047 R)
- M10: 1,863,391 km (0.088 R)
- M11: 1,977,684 km (0.104 R)
- M12: 2,282,265 km (0.111 R)
- M13: 2,404,786 km (0.062 R)
- M14: 2,916,710 km (0.112 R)
- M15: 3,401,706 km (0.097 R)
- M16: 3,725,286 km (0.048 R)
- M17: 3,911,685 km (0.053 R)
- M18: 4,207,739 km (0.11 R)
- M19: 4,336,842 km (0.115 R)
- M20: 4,423,609 km (0.12 R)
- M21: 4,554,956 km (0.112 R)
- M22: 4,665,359 km (0.115 R)
- M23: 5,002,104 km (0.042 R)
- M24: 5,346,628 km (0.082 R)
- M25: 5,675,145 km (0.116 R)
- M26: 5,794,075 km (0.071 R)
- M27: 6,058,564 km (0.106 R)
- M28: 6,549,844 km (0.091 R)
- M29: 6,674,608 km (0.04 R)
- M30: 6,977,394 km (0.053 R)
- M31: 7,336,280 km (0.106 R)
- M32: 7,622,610 km (0.09 R)
- M33: 7,780,286 km (0.103 R)
- M34: 7,886,052 km (0.101 R)
- M35: 8,666,803 km (0.069 R)
- M36: 8,859,036 km (0.115 R)
- M37: 9,275,517 km (0.089 R)
- M38: 9,613,309 km (0.084 R)
- M39: 9,869,420 km (0.071 R)
- M40: 10,475,591 km (0.071 R)
- M41: 10,768,504 km (0.093 R)
- M42: 10,827,295 km (0.11 R)
- M43: 11,123,499 km (0.114 R)
- M44: 11,212,809 km (0.104 R)
- M45: 11,482,385 km (0.079 R)
- M46: 12,643,862 km (0.089 R)
- M47: 12,768,178 km (0.112 R)
- M48: 12,924,358 km (0.067 R)
- M49: 14,066,987 km (0.095 R)
- M50: 14,131,464 km (0.048 R)
- M51: 14,292,880 km (0.09 R)
- M52: 15,274,691 km (0.074 R)
- M53: 15,773,749 km (0.09 R)
- M54: 15,974,958 km (0.094 R)
- M55: 16,583,373 km (0.111 R)
- M56: 17,061,936 km (0.096 R)
- M57: 17,130,602 km (0.073 R)
- M58: 17,649,108 km (0.036 R)
- M59: 18,242,862 km (0.119 R)
- M60: 18,665,925 km (0.095 R)
- M61: 19,629,634 km (0.045 R)
- M62: 19,809,900 km (0.111 R)
- M63: 20,572,998 km (0.082 R)
- M64: 20,755,957 km (0.042 R)
- M65: 21,271,620 km (0.089 R)
- M66: 21,493,773 km (0.044 R)
- M67: 21,642,324 km (0.081 R)
- M68: 22,315,215 km (0.101 R)
- M69: 23,375,565 km (0.03 R)
- M70: 23,604,898 km (0.112 R)
- M71: 24,957,562 km (0.109 R)
- M72: 25,113,743 km (0.099 R)
- M73: 25,663,066 km (0.092 R)
- M74: 26,057,705 km (0.083 R)
- M75: 26,216,279 km (0.116 R)
Kuiper Belt
Range: 30 - 54 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 460 - 15,669 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.