Star System Generated (Seed: 1768752616)
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: 0.51 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 451.3
Radius: 10.7
Gravity: 3.94 G
Time & Orbit
Eccentricity (e): 0.136
Orbit Range: 0.44 AU - 0.58 AU
Year: 247 Days
Day: 8 Hours
Environment
Temp: -147 °C
Axial Tilt: 11.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (35)
Outer Limit: 21,508,920 km
- M1: 134,638 km (0.118 R)
- M2: 229,633 km (0.041 R)
- M3: 357,090 km (0.106 R)
- M4: 477,217 km (0.1 R)
- M5: 563,834 km (0.091 R)
- M6: 653,743 km (0.064 R)
- M7: 737,817 km (0.104 R)
- M8: 832,063 km (0.103 R)
- M9: 914,941 km (0.069 R)
- M10: 997,668 km (0.111 R)
- M11: 1,086,380 km (0.113 R)
- M12: 1,164,320 km (0.107 R)
- M13: 1,254,677 km (0.094 R)
- M14: 1,457,831 km (0.091 R)
- M15: 1,648,569 km (0.096 R)
- M16: 1,767,050 km (0.074 R)
- M17: 1,847,683 km (0.081 R)
- M18: 1,917,246 km (0.11 R)
- M19: 2,054,876 km (0.082 R)
- M20: 2,131,321 km (0.085 R)
- M21: 2,226,166 km (0.086 R)
- M22: 2,304,705 km (0.104 R)
- M23: 2,379,953 km (0.076 R)
- M24: 2,455,948 km (0.089 R)
- M25: 2,528,204 km (0.079 R)
- M26: 2,642,646 km (0.117 R)
- M27: 2,730,909 km (0.089 R)
- M28: 2,843,706 km (0.051 R)
- M29: 2,924,489 km (0.04 R)
- M30: 3,059,426 km (0.076 R)
- M31: 3,137,367 km (0.089 R)
- M32: 3,216,205 km (0.086 R)
- M33: 3,325,561 km (0.094 R)
- M34: 3,441,200 km (0.095 R)
- M35: 3,527,518 km (0.068 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.95 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 895.3
Radius: 13.8
Gravity: 4.7 G
Time & Orbit
Eccentricity (e): 0.152
Orbit Range: 0.81 AU - 1.09 AU
Year: 628 Days
Day: 13.4 Hours
Environment
Temp: -163 °C
Axial Tilt: 46.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (52)
Outer Limit: 21,508,920 km
- M1: 175,329 km (0.055 R)
- M2: 299,794 km (0.091 R)
- M3: 409,001 km (0.068 R)
- M4: 534,214 km (0.115 R)
- M5: 700,268 km (0.105 R)
- M6: 864,526 km (0.066 R)
- M7: 951,891 km (0.095 R)
- M8: 1,071,869 km (0.081 R)
- M9: 1,246,599 km (0.072 R)
- M10: 1,353,711 km (0.092 R)
- M11: 1,484,011 km (0.12 R)
- M12: 1,605,185 km (0.101 R)
- M13: 1,701,825 km (0.082 R)
- M14: 1,843,495 km (0.113 R)
- M15: 1,930,411 km (0.037 R)
- M16: 2,026,303 km (0.04 R)
- M17: 2,261,471 km (0.078 R)
- M18: 2,370,827 km (0.12 R)
- M19: 2,570,540 km (0.113 R)
- M20: 2,817,825 km (0.09 R)
- M21: 2,927,331 km (0.101 R)
- M22: 3,124,950 km (0.104 R)
- M23: 3,212,165 km (0.039 R)
- M24: 3,300,279 km (0.11 R)
- M25: 3,506,125 km (0.11 R)
- M26: 3,606,206 km (0.075 R)
- M27: 3,716,310 km (0.096 R)
- M28: 3,958,958 km (0.093 R)
- M29: 4,120,524 km (0.072 R)
- M30: 4,206,991 km (0.081 R)
- M31: 4,303,781 km (0.116 R)
- M32: 4,489,731 km (0.092 R)
- M33: 4,738,513 km (0.101 R)
- M34: 4,859,687 km (0.104 R)
- M35: 4,951,091 km (0.079 R)
- M36: 5,043,243 km (0.104 R)
- M37: 5,146,167 km (0.093 R)
- M38: 5,469,897 km (0.052 R)
- M39: 5,565,190 km (0.075 R)
- M40: 5,703,868 km (0.109 R)
- M41: 5,854,363 km (0.077 R)
- M42: 5,984,513 km (0.107 R)
- M43: 6,236,735 km (0.05 R)
- M44: 6,369,728 km (0.066 R)
- M45: 6,526,058 km (0.101 R)
- M46: 6,774,390 km (0.114 R)
- M47: 7,141,054 km (0.101 R)
- M48: 7,303,667 km (0.117 R)
- M49: 7,467,327 km (0.069 R)
- M50: 7,715,361 km (0.081 R)
- M51: 8,050,310 km (0.096 R)
- M52: 8,195,271 km (0.081 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.05 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 239
Radius: 11.3
Gravity: 1.87 G
Time & Orbit
Eccentricity (e): 0.059
Orbit Range: 0.99 AU - 1.11 AU
Year: 730 Days
Day: 9.9 Hours
Environment
Temp: -181 °C
Axial Tilt: 18.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (42)
Outer Limit: 21,508,920 km
- M1: 141,071 km (0.119 R)
- M2: 224,995 km (0.093 R)
- M3: 325,226 km (0.077 R)
- M4: 397,781 km (0.096 R)
- M5: 478,115 km (0.115 R)
- M6: 561,590 km (0.11 R)
- M7: 705,952 km (0.058 R)
- M8: 859,589 km (0.105 R)
- M9: 938,577 km (0.073 R)
- M10: 1,029,533 km (0.117 R)
- M11: 1,099,993 km (0.025 R)
- M12: 1,245,851 km (0.097 R)
- M13: 1,383,032 km (0.089 R)
- M14: 1,466,807 km (0.105 R)
- M15: 1,546,842 km (0.052 R)
- M16: 1,751,193 km (0.07 R)
- M17: 1,853,817 km (0.097 R)
- M18: 2,047,546 km (0.098 R)
- M19: 2,198,640 km (0.106 R)
- M20: 2,316,224 km (0.099 R)
- M21: 2,467,617 km (0.114 R)
- M22: 2,557,525 km (0.071 R)
- M23: 2,760,679 km (0.097 R)
- M24: 2,914,765 km (0.109 R)
- M25: 3,010,059 km (0.116 R)
- M26: 3,168,932 km (0.107 R)
- M27: 3,560,130 km (0.101 R)
- M28: 3,662,156 km (0.083 R)
- M29: 3,735,608 km (0.117 R)
- M30: 3,854,389 km (0.083 R)
- M31: 3,981,847 km (0.096 R)
- M32: 4,318,442 km (0.106 R)
- M33: 4,411,791 km (0.064 R)
- M34: 4,537,453 km (0.119 R)
- M35: 4,696,176 km (0.107 R)
- M36: 4,945,855 km (0.05 R)
- M37: 5,109,216 km (0.108 R)
- M38: 5,391,208 km (0.069 R)
- M39: 5,534,224 km (0.107 R)
- M40: 5,610,369 km (0.115 R)
- M41: 5,738,126 km (0.078 R)
- M42: 5,823,845 km (0.035 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.91 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 887.8
Radius: 9.3
Gravity: 10.26 G
Time & Orbit
Eccentricity (e): 0.179
Orbit Range: 1.57 AU - 2.25 AU
Year: 1790 Days
Day: 11.7 Hours
Environment
Temp: -207 °C
Axial Tilt: 29.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 21,508,920 km
- M1: 132,095 km (0.109 R)
- M2: 223,649 km (0.032 R)
- M3: 340,036 km (0.065 R)
- M4: 414,386 km (0.086 R)
- M5: 575,653 km (0.081 R)
- M6: 826,827 km (0.118 R)
- M7: 942,467 km (0.073 R)
- M8: 1,230,592 km (0.12 R)
- M9: 1,291,628 km (0.045 R)
- M10: 1,416,841 km (0.059 R)
- M11: 1,502,561 km (0.046 R)
- M12: 1,634,656 km (0.071 R)
- M13: 1,724,863 km (0.079 R)
- M14: 2,041,861 km (0.053 R)
- M15: 2,415,706 km (0.086 R)
- M16: 2,519,079 km (0.109 R)
- M17: 2,676,904 km (0.034 R)
- M18: 2,770,553 km (0.078 R)
- M19: 2,838,021 km (0.095 R)
- M20: 2,919,851 km (0.069 R)
- M21: 3,113,880 km (0.101 R)
- M22: 3,226,676 km (0.104 R)
- M23: 3,706,287 km (0.101 R)
- M24: 3,810,856 km (0.09 R)
- M25: 4,115,288 km (0.071 R)
- M26: 4,254,863 km (0.105 R)
- M27: 4,364,667 km (0.074 R)
- M28: 4,618,834 km (0.104 R)
- M29: 5,108,618 km (0.08 R)
- M30: 5,191,944 km (0.078 R)
- M31: 5,478,424 km (0.107 R)
- M32: 5,649,414 km (0.032 R)
- M33: 6,014,283 km (0.108 R)
- M34: 6,476,541 km (0.071 R)
- M35: 6,748,360 km (0.11 R)
- M36: 6,839,914 km (0.082 R)
- M37: 6,931,767 km (0.114 R)
- M38: 7,154,069 km (0.114 R)
- M39: 7,567,707 km (0.115 R)
- M40: 7,950,379 km (0.066 R)
- M41: 8,027,721 km (0.105 R)
- M42: 8,163,705 km (0.104 R)
- M43: 8,280,691 km (0.119 R)
- M44: 8,556,250 km (0.063 R)
- M45: 8,655,284 km (0.052 R)
- M46: 8,874,744 km (0.119 R)
- M47: 9,055,608 km (0.091 R)
- M48: 9,278,210 km (0.093 R)
- M49: 9,400,581 km (0.089 R)
- M50: 9,543,895 km (0.085 R)
- M51: 9,646,669 km (0.095 R)
- M52: 9,874,207 km (0.067 R)
- M53: 10,019,916 km (0.116 R)
- M54: 10,103,391 km (0.108 R)
- M55: 10,208,260 km (0.03 R)
- M56: 10,461,230 km (0.1 R)
- M57: 11,167,631 km (0.072 R)
- M58: 11,472,062 km (0.114 R)
- M59: 11,823,318 km (0.097 R)
- M60: 12,044,573 km (0.061 R)
- M61: 12,334,344 km (0.114 R)
- M62: 12,423,954 km (0.113 R)
- M63: 12,513,862 km (0.078 R)
- M64: 12,603,920 km (0.101 R)
- M65: 12,694,127 km (0.066 R)
- M66: 13,470,241 km (0.107 R)
- M67: 13,631,956 km (0.111 R)
- M68: 14,027,194 km (0.104 R)
- M69: 14,167,666 km (0.09 R)
- M70: 14,261,614 km (0.09 R)
- M71: 14,520,867 km (0.074 R)
- M72: 14,615,562 km (0.113 R)
- M73: 14,781,616 km (0.103 R)
- M74: 15,187,774 km (0.095 R)
- M75: 15,597,672 km (0.071 R)
- M76: 16,305,270 km (0.085 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.24 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 148
Radius: 10.3
Gravity: 1.4 G
Time & Orbit
Eccentricity (e): 0.232
Orbit Range: 1.72 AU - 2.76 AU
Year: 2274 Days
Day: 8.5 Hours
Environment
Temp: -207 °C
Axial Tilt: 32.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (58)
Outer Limit: 21,508,920 km
- M1: 129,851 km (0.113 R)
- M2: 206,445 km (0.112 R)
- M3: 276,008 km (0.053 R)
- M4: 345,571 km (0.1 R)
- M5: 488,287 km (0.064 R)
- M6: 562,638 km (0.07 R)
- M7: 630,106 km (0.091 R)
- M8: 963,709 km (0.103 R)
- M9: 1,082,191 km (0.116 R)
- M10: 1,146,967 km (0.119 R)
- M11: 1,228,049 km (0.043 R)
- M12: 1,334,114 km (0.115 R)
- M13: 1,475,334 km (0.077 R)
- M14: 1,572,423 km (0.116 R)
- M15: 1,738,926 km (0.032 R)
- M16: 1,833,023 km (0.064 R)
- M17: 1,973,196 km (0.026 R)
- M18: 2,125,935 km (0.039 R)
- M19: 2,254,889 km (0.084 R)
- M20: 2,320,263 km (0.084 R)
- M21: 2,776,387 km (0.08 R)
- M22: 2,989,265 km (0.1 R)
- M23: 3,207,528 km (0.114 R)
- M24: 3,302,672 km (0.067 R)
- M25: 3,583,019 km (0.063 R)
- M26: 3,648,842 km (0.106 R)
- M27: 3,904,953 km (0.098 R)
- M28: 3,995,460 km (0.119 R)
- M29: 4,305,876 km (0.113 R)
- M30: 4,422,861 km (0.05 R)
- M31: 5,073,163 km (0.103 R)
- M32: 5,209,297 km (0.111 R)
- M33: 5,309,079 km (0.058 R)
- M34: 5,447,307 km (0.111 R)
- M35: 5,676,192 km (0.109 R)
- M36: 5,740,369 km (0.11 R)
- M37: 5,817,712 km (0.113 R)
- M38: 6,012,488 km (0.119 R)
- M39: 6,328,588 km (0.097 R)
- M40: 6,408,474 km (0.059 R)
- M41: 6,596,219 km (0.104 R)
- M42: 6,799,373 km (0.077 R)
- M43: 6,935,956 km (0.065 R)
- M44: 7,267,614 km (0.109 R)
- M45: 7,547,961 km (0.041 R)
- M46: 7,618,571 km (0.079 R)
- M47: 7,817,536 km (0.094 R)
- M48: 8,018,296 km (0.07 R)
- M49: 8,090,253 km (0.079 R)
- M50: 8,763,742 km (0.028 R)
- M51: 8,852,903 km (0.086 R)
- M52: 8,957,472 km (0.119 R)
- M53: 9,348,820 km (0.05 R)
- M54: 9,440,074 km (0.108 R)
- M55: 9,792,228 km (0.042 R)
- M56: 10,242,368 km (0.075 R)
- M57: 10,367,731 km (0.108 R)
- M58: 10,556,823 km (0.104 R)
Planet 6 - Gas Giant
Semi-Major Axis: 2.52 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 831.5
Radius: 8.1
Gravity: 12.67 G
Time & Orbit
Eccentricity (e): 0.135
Orbit Range: 2.18 AU - 2.86 AU
Year: 2713 Days
Day: 12.1 Hours
Environment
Temp: -209 °C
Axial Tilt: 7.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (84)
Outer Limit: 21,508,920 km
- M1: 152,291 km (0.071 R)
- M2: 504,294 km (0.071 R)
- M3: 583,282 km (0.099 R)
- M4: 667,057 km (0.108 R)
- M5: 998,416 km (0.104 R)
- M6: 1,182,272 km (0.109 R)
- M7: 1,414,897 km (0.078 R)
- M8: 1,517,371 km (0.115 R)
- M9: 1,853,218 km (0.109 R)
- M10: 1,951,504 km (0.046 R)
- M11: 2,008,501 km (0.098 R)
- M12: 2,138,651 km (0.063 R)
- M13: 2,703,084 km (0.106 R)
- M14: 2,993,902 km (0.074 R)
- M15: 3,076,480 km (0.094 R)
- M16: 3,143,201 km (0.102 R)
- M17: 3,675,769 km (0.089 R)
- M18: 3,728,877 km (0.088 R)
- M19: 4,070,857 km (0.077 R)
- M20: 4,144,160 km (0.105 R)
- M21: 4,236,313 km (0.059 R)
- M22: 4,422,861 km (0.097 R)
- M23: 4,901,125 km (0.061 R)
- M24: 5,038,007 km (0.113 R)
- M25: 5,436,087 km (0.077 R)
- M26: 5,741,267 km (0.103 R)
- M27: 5,927,068 km (0.099 R)
- M28: 6,114,963 km (0.03 R)
- M29: 6,220,130 km (0.059 R)
- M30: 6,755,092 km (0.09 R)
- M31: 6,820,317 km (0.111 R)
- M32: 6,973,355 km (0.053 R)
- M33: 7,083,310 km (0.086 R)
- M34: 7,327,154 km (0.094 R)
- M35: 7,686,937 km (0.119 R)
- M36: 7,846,259 km (0.12 R)
- M37: 8,191,082 km (0.063 R)
- M38: 8,682,361 km (0.077 R)
- M39: 8,895,688 km (0.07 R)
- M40: 8,991,131 km (0.067 R)
- M41: 9,134,895 km (0.065 R)
- M42: 9,231,236 km (0.098 R)
- M43: 9,717,728 km (0.081 R)
- M44: 9,791,330 km (0.081 R)
- M45: 9,988,799 km (0.078 R)
- M46: 10,715,546 km (0.095 R)
- M47: 10,842,554 km (0.078 R)
- M48: 11,046,905 km (0.049 R)
- M49: 11,226,572 km (0.073 R)
- M50: 11,407,436 km (0.083 R)
- M51: 11,615,227 km (0.088 R)
- M52: 12,272,561 km (0.072 R)
- M53: 12,565,623 km (0.059 R)
- M54: 12,861,079 km (0.061 R)
- M55: 13,050,170 km (0.081 R)
- M56: 13,131,551 km (0.027 R)
- M57: 13,650,656 km (0.091 R)
- M58: 13,705,708 km (0.094 R)
- M59: 13,898,989 km (0.064 R)
- M60: 14,596,563 km (0.104 R)
- M61: 14,737,335 km (0.105 R)
- M62: 14,793,883 km (0.113 R)
- M63: 14,963,677 km (0.114 R)
- M64: 15,534,542 km (0.09 R)
- M65: 15,822,668 km (0.099 R)
- M66: 16,025,522 km (0.08 R)
- M67: 16,199,953 km (0.1 R)
- M68: 16,580,082 km (0.118 R)
- M69: 16,638,874 km (0.066 R)
- M70: 16,992,822 km (0.071 R)
- M71: 17,230,234 km (0.06 R)
- M72: 17,708,199 km (0.077 R)
- M73: 17,978,971 km (0.104 R)
- M74: 18,281,458 km (0.097 R)
- M75: 18,494,186 km (0.095 R)
- M76: 18,585,740 km (0.062 R)
- M77: 19,229,909 km (0.101 R)
- M78: 19,384,443 km (0.114 R)
- M79: 19,477,344 km (0.04 R)
- M80: 19,601,360 km (0.057 R)
- M81: 19,787,909 km (0.071 R)
- M82: 20,351,294 km (0.09 R)
- M83: 20,603,367 km (0.112 R)
- M84: 20,761,492 km (0.115 R)
Planet 7 - Gas Giant
Semi-Major Axis: 2.62 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 748.1
Radius: 13.4
Gravity: 4.17 G
Time & Orbit
Eccentricity (e): 0.038
Orbit Range: 2.52 AU - 2.72 AU
Year: 2876 Days
Day: 5.9 Hours
Environment
Temp: -208 °C
Axial Tilt: 101 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (69)
Outer Limit: 21,508,920 km
- M1: 170,093 km (0.044 R)
- M2: 419,772 km (0.03 R)
- M3: 528,529 km (0.079 R)
- M4: 613,800 km (0.12 R)
- M5: 704,905 km (0.062 R)
- M6: 791,522 km (0.088 R)
- M7: 966,552 km (0.08 R)
- M8: 1,098,497 km (0.047 R)
- M9: 1,431,352 km (0.119 R)
- M10: 1,584,092 km (0.113 R)
- M11: 1,837,361 km (0.068 R)
- M12: 2,004,462 km (0.076 R)
- M13: 2,104,244 km (0.108 R)
- M14: 2,264,613 km (0.088 R)
- M15: 2,597,917 km (0.109 R)
- M16: 2,754,845 km (0.069 R)
- M17: 3,061,670 km (0.103 R)
- M18: 3,328,702 km (0.113 R)
- M19: 3,850,350 km (0.083 R)
- M20: 4,011,916 km (0.089 R)
- M21: 4,102,722 km (0.115 R)
- M22: 4,360,479 km (0.111 R)
- M23: 4,453,977 km (0.116 R)
- M24: 4,699,916 km (0.081 R)
- M25: 5,126,569 km (0.084 R)
- M26: 5,364,729 km (0.104 R)
- M27: 5,647,020 km (0.115 R)
- M28: 6,163,582 km (0.106 R)
- M29: 6,310,936 km (0.118 R)
- M30: 6,652,169 km (0.071 R)
- M31: 6,825,104 km (0.101 R)
- M32: 7,241,883 km (0.115 R)
- M33: 7,397,615 km (0.071 R)
- M34: 7,509,514 km (0.096 R)
- M35: 7,621,862 km (0.103 R)
- M36: 7,734,958 km (0.114 R)
- M37: 8,008,423 km (0.051 R)
- M38: 8,169,540 km (0.103 R)
- M39: 8,588,563 km (0.062 R)
- M40: 8,682,660 km (0.096 R)
- M41: 9,062,639 km (0.076 R)
- M42: 9,789,535 km (0.045 R)
- M43: 10,259,721 km (0.104 R)
- M44: 10,686,673 km (0.077 R)
- M45: 11,480,290 km (0.059 R)
- M46: 11,610,141 km (0.072 R)
- M47: 11,714,261 km (0.037 R)
- M48: 12,239,948 km (0.1 R)
- M49: 12,585,669 km (0.098 R)
- M50: 12,934,830 km (0.095 R)
- M51: 13,096,994 km (0.097 R)
- M52: 13,532,773 km (0.073 R)
- M53: 14,251,292 km (0.08 R)
- M54: 14,334,917 km (0.1 R)
- M55: 15,095,622 km (0.082 R)
- M56: 16,043,175 km (0.043 R)
- M57: 16,509,471 km (0.092 R)
- M58: 16,980,406 km (0.092 R)
- M59: 17,128,507 km (0.056 R)
- M60: 17,905,220 km (0.115 R)
- M61: 18,116,302 km (0.085 R)
- M62: 18,267,695 km (0.1 R)
- M63: 18,419,387 km (0.095 R)
- M64: 19,276,733 km (0.119 R)
- M65: 19,369,484 km (0.102 R)
- M66: 19,772,650 km (0.064 R)
- M67: 20,241,340 km (0.096 R)
- M68: 20,713,620 km (0.118 R)
- M69: 21,062,333 km (0.087 R)
Kuiper Belt
Range: 30 - 57 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 189 - 18,533 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.