🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.6 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.86

Radius: 1.28

Gravity: 1.14 G

Time & Orbit

Eccentricity (e): 0.035

Orbit Range: 0.58 AU - 0.62 AU

Year: 300 Days

Day: 40.9 Hours

Environment

Temp: -135 °C

Axial Tilt: 29.2 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Gas Giant

Semi-Major Axis: 0.91 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 787.5

Radius: 14.1

Gravity: 3.96 G

Time & Orbit

Eccentricity (e): 0.235

Orbit Range: 0.7 AU - 1.12 AU

Year: 561 Days

Day: 12.9 Hours

Environment

Temp: -156 °C

Axial Tilt: 28.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (41)

Outer Limit: 56,619,847 km

• M1: 194,178 km (0.113 R)
• M2: 283,488 km (0.113 R)
• M3: 492,626 km (0.102 R)
• M4: 600,785 km (0.031 R)
• M5: 742,005 km (0.097 R)
• M6: 861,235 km (0.048 R)
• M7: 1,302,249 km (0.097 R)
• M8: 1,396,496 km (0.086 R)
• M9: 1,530,087 km (0.091 R)
• M10: 1,630,168 km (0.09 R)
• M11: 1,771,388 km (0.096 R)
• M12: 1,883,587 km (0.095 R)
• M13: 2,039,318 km (0.099 R)
• M14: 2,185,475 km (0.085 R)
• M15: 2,436,949 km (0.109 R)
• M16: 2,652,819 km (0.044 R)
• M17: 2,805,409 km (0.081 R)
• M18: 3,024,121 km (0.103 R)
• M19: 3,151,578 km (0.055 R)
• M20: 3,289,208 km (0.105 R)
• M21: 3,470,222 km (0.035 R)
• M22: 3,782,283 km (0.106 R)
• M23: 3,876,829 km (0.12 R)
• M24: 4,147,751 km (0.07 R)
• M25: 4,254,264 km (0.062 R)
• M26: 4,433,931 km (0.081 R)
• M27: 4,662,068 km (0.065 R)
• M28: 4,763,795 km (0.104 R)
• M29: 4,912,944 km (0.109 R)
• M30: 5,197,030 km (0.057 R)
• M31: 5,321,795 km (0.081 R)
• M32: 5,476,778 km (0.108 R)
• M33: 5,890,715 km (0.107 R)
• M34: 6,051,234 km (0.111 R)
• M35: 6,274,135 km (0.092 R)
• M36: 6,520,522 km (0.114 R)
• M37: 6,728,314 km (0.079 R)
• M38: 6,843,654 km (0.034 R)
• M39: 7,044,265 km (0.081 R)
• M40: 7,193,264 km (0.055 R)
• M41: 7,354,231 km (0.096 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.87 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 631.2

Radius: 13.9

Gravity: 3.27 G

Time & Orbit

Eccentricity (e): 0.127

Orbit Range: 1.63 AU - 2.11 AU

Year: 1651 Days

Day: 14 Hours

Environment

Temp: -179 °C

Axial Tilt: 20.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (59)

Outer Limit: 56,619,847 km

• M1: 195,824 km (0.108 R)
• M2: 296,503 km (0.059 R)
• M3: 510,428 km (0.092 R)
• M4: 624,571 km (0.102 R)
• M5: 837,748 km (0.118 R)
• M6: 970,292 km (0.07 R)
• M7: 1,240,615 km (0.099 R)
• M8: 1,469,201 km (0.115 R)
• M9: 1,652,608 km (0.111 R)
• M10: 1,772,585 km (0.097 R)
• M11: 1,895,704 km (0.096 R)
• M12: 2,096,465 km (0.054 R)
• M13: 2,338,215 km (0.106 R)
• M14: 2,462,531 km (0.083 R)
• M15: 2,753,648 km (0.046 R)
• M16: 2,873,326 km (0.089 R)
• M17: 2,982,533 km (0.041 R)
• M18: 3,242,983 km (0.071 R)
• M19: 3,407,989 km (0.082 R)
• M20: 3,498,047 km (0.09 R)
• M21: 3,852,893 km (0.079 R)
• M22: 4,178,269 km (0.098 R)
• M23: 4,288,821 km (0.089 R)
• M24: 4,484,495 km (0.094 R)
• M25: 4,870,607 km (0.093 R)
• M26: 4,986,995 km (0.071 R)
• M27: 5,148,710 km (0.099 R)
• M28: 5,507,595 km (0.071 R)
• M29: 5,598,551 km (0.094 R)
• M30: 5,782,257 km (0.055 R)
• M31: 6,092,672 km (0.074 R)
• M32: 6,202,627 km (0.086 R)
• M33: 6,344,894 km (0.096 R)
• M34: 6,778,579 km (0.117 R)
• M35: 7,188,926 km (0.066 R)
• M36: 7,372,033 km (0.095 R)
• M37: 7,896,374 km (0.117 R)
• M38: 7,999,297 km (0.071 R)
• M39: 8,102,669 km (0.106 R)
• M40: 8,397,826 km (0.116 R)
• M41: 8,626,112 km (0.071 R)
• M42: 9,377,543 km (0.075 R)
• M43: 9,504,850 km (0.065 R)
• M44: 9,632,607 km (0.099 R)
• M45: 9,797,913 km (0.078 R)
• M46: 10,187,166 km (0.06 R)
• M47: 10,280,665 km (0.05 R)
• M48: 10,449,561 km (0.118 R)
• M49: 10,828,343 km (0.052 R)
• M50: 10,923,786 km (0.033 R)
• M51: 11,192,314 km (0.063 R)
• M52: 11,638,415 km (0.095 R)
• M53: 11,755,700 km (0.105 R)
• M54: 12,668,247 km (0.066 R)
• M55: 12,849,560 km (0.091 R)
• M56: 13,133,197 km (0.117 R)
• M57: 13,235,073 km (0.092 R)
• M58: 13,706,755 km (0.102 R)
• M59: 14,038,115 km (0.074 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.45 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 928.7

Radius: 10.8

Gravity: 7.96 G

Time & Orbit

Eccentricity (e): 0.123

Orbit Range: 2.15 AU - 2.75 AU

Year: 2476 Days

Day: 5.7 Hours

Environment

Temp: -194 °C

Axial Tilt: 7.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (67)

Outer Limit: 56,619,847 km

• M1: 134,937 km (0.073 R)
• M2: 231,727 km (0.102 R)
• M3: 339,438 km (0.114 R)
• M4: 417,228 km (0.081 R)
• M5: 604,675 km (0.112 R)
• M6: 781,798 km (0.103 R)
• M7: 913,295 km (0.106 R)
• M8: 998,267 km (0.088 R)
• M9: 1,329,775 km (0.106 R)
• M10: 1,629,869 km (0.045 R)
• M11: 1,801,607 km (0.068 R)
• M12: 1,869,225 km (0.042 R)
• M13: 1,951,654 km (0.072 R)
• M14: 2,235,291 km (0.071 R)
• M15: 2,639,355 km (0.112 R)
• M16: 2,763,671 km (0.091 R)
• M17: 2,905,789 km (0.086 R)
• M18: 3,756,552 km (0.093 R)
• M19: 3,826,414 km (0.119 R)
• M20: 4,437,970 km (0.044 R)
• M21: 4,680,020 km (0.094 R)
• M22: 6,262,765 km (0.11 R)
• M23: 6,703,630 km (0.114 R)
• M24: 6,788,751 km (0.081 R)
• M25: 6,938,499 km (0.048 R)
• M26: 7,482,736 km (0.066 R)
• M27: 7,593,289 km (0.097 R)
• M28: 7,771,161 km (0.101 R)
• M29: 7,905,649 km (0.104 R)
• M30: 8,018,147 km (0.082 R)
• M31: 8,108,653 km (0.052 R)
• M32: 8,290,564 km (0.09 R)
• M33: 8,589,012 km (0.119 R)
• M34: 8,751,176 km (0.068 R)
• M35: 8,867,713 km (0.078 R)
• M36: 9,008,185 km (0.098 R)
• M37: 9,410,304 km (0.091 R)
• M38: 9,529,684 km (0.087 R)
• M39: 10,060,906 km (0.092 R)
• M40: 10,478,134 km (0.044 R)
• M41: 10,601,851 km (0.075 R)
• M42: 10,825,949 km (0.099 R)
• M43: 11,329,346 km (0.106 R)
• M44: 11,507,367 km (0.113 R)
• M45: 11,686,436 km (0.12 R)
• M46: 11,892,133 km (0.102 R)
• M47: 12,099,027 km (0.112 R)
• M48: 12,176,818 km (0.115 R)
• M49: 12,806,027 km (0.083 R)
• M50: 13,526,490 km (0.1 R)
• M51: 13,661,278 km (0.095 R)
• M52: 14,014,029 km (0.053 R)
• M53: 14,205,215 km (0.089 R)
• M54: 14,617,806 km (0.072 R)
• M55: 15,090,236 km (0.101 R)
• M56: 15,822,518 km (0.115 R)
• M57: 16,250,218 km (0.086 R)
• M58: 16,971,579 km (0.031 R)
• M59: 17,087,966 km (0.038 R)
• M60: 17,438,624 km (0.096 R)
• M61: 17,880,536 km (0.026 R)
• M62: 18,565,096 km (0.114 R)
• M63: 19,592,833 km (0.086 R)
• M64: 19,776,091 km (0.049 R)
• M65: 19,929,279 km (0.081 R)
• M66: 20,545,921 km (0.073 R)
• M67: 20,763,137 km (0.086 R)

Planet 5 - Gas Giant

Semi-Major Axis: 3.28 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 226.1

Radius: 9.8

Gravity: 2.35 G

Time & Orbit

Eccentricity (e): 0.138

Orbit Range: 2.83 AU - 3.73 AU

Year: 3836 Days

Day: 9.2 Hours

Environment

Temp: -212 °C

Axial Tilt: 37.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 56,619,847 km

• M1: 136,732 km (0.049 R)
• M2: 198,965 km (0.059 R)
• M3: 304,432 km (0.079 R)
• M4: 377,136 km (0.091 R)
• M5: 529,576 km (0.081 R)
• M6: 712,684 km (0.098 R)
• M7: 816,804 km (0.081 R)
• M8: 954,734 km (0.081 R)
• M9: 1,041,351 km (0.084 R)
• M10: 1,222,813 km (0.113 R)
• M11: 1,328,279 km (0.101 R)
• M12: 1,640,191 km (0.036 R)
• M13: 1,721,871 km (0.113 R)
• M14: 1,877,304 km (0.069 R)
• M15: 1,938,340 km (0.084 R)
• M16: 2,049,790 km (0.096 R)
• M17: 2,176,350 km (0.093 R)
• M18: 2,240,677 km (0.051 R)
• M19: 2,558,124 km (0.057 R)
• M20: 2,763,970 km (0.116 R)
• M21: 2,932,567 km (0.093 R)
• M22: 3,046,860 km (0.038 R)
• M23: 3,221,291 km (0.115 R)
• M24: 3,324,513 km (0.097 R)
• M25: 3,825,966 km (0.077 R)
• M26: 3,951,179 km (0.091 R)
• M27: 4,141,617 km (0.093 R)
• M28: 4,205,795 km (0.115 R)
• M29: 4,781,148 km (0.084 R)
• M30: 5,433,993 km (0.106 R)
• M31: 5,539,609 km (0.068 R)
• M32: 5,610,519 km (0.104 R)
• M33: 5,860,796 km (0.115 R)
• M34: 6,261,419 km (0.115 R)
• M35: 6,652,318 km (0.092 R)
• M36: 6,727,566 km (0.041 R)
• M37: 6,917,256 km (0.095 R)
• M38: 7,360,215 km (0.082 R)
• M39: 7,477,201 km (0.098 R)
• M40: 7,713,266 km (0.047 R)
• M41: 7,891,736 km (0.103 R)
• M42: 8,273,361 km (0.117 R)
• M43: 8,558,494 km (0.052 R)
• M44: 8,681,613 km (0.079 R)
• M45: 8,825,975 km (0.107 R)
• M46: 8,971,235 km (0.087 R)
• M47: 9,369,464 km (0.067 R)
• M48: 9,475,230 km (0.084 R)
• M49: 9,538,959 km (0.108 R)
• M50: 9,880,790 km (0.066 R)
• M51: 10,161,585 km (0.032 R)
• M52: 10,248,501 km (0.081 R)
• M53: 10,510,746 km (0.109 R)
• M54: 10,664,832 km (0.077 R)
• M55: 10,886,087 km (0.105 R)
• M56: 11,153,718 km (0.119 R)
• M57: 11,288,356 km (0.112 R)
• M58: 11,536,689 km (0.103 R)
• M59: 11,672,823 km (0.071 R)
• M60: 12,061,478 km (0.101 R)
• M61: 12,594,196 km (0.089 R)
• M62: 13,063,634 km (0.108 R)
• M63: 13,253,025 km (0.086 R)
• M64: 13,443,313 km (0.105 R)
• M65: 13,850,668 km (0.102 R)
• M66: 14,043,799 km (0.057 R)
• M67: 14,653,111 km (0.06 R)
• M68: 15,246,117 km (0.041 R)
• M69: 15,746,373 km (0.04 R)
• M70: 16,277,445 km (0.083 R)
• M71: 16,609,104 km (0.029 R)
• M72: 16,711,728 km (0.11 R)
• M73: 17,175,631 km (0.116 R)

Planet 6 - Ice Giant

Semi-Major Axis: 6.31 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 721.5

Radius: 7.9

Gravity: 11.56 G

Time & Orbit

Eccentricity (e): 0.073

Orbit Range: 5.85 AU - 6.77 AU

Year: 10234 Days

Day: 17.6 Hours

Environment

Temp: -212 °C

Axial Tilt: 36.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 56,619,847 km

• M1: 102,624 km (0.075 R)
• M2: 180,116 km (0.103 R)
• M3: 355,145 km (0.115 R)
• M4: 650,900 km (0.108 R)
• M5: 701,315 km (0.101 R)
• M6: 842,984 km (0.034 R)
• M7: 1,280,259 km (0.087 R)
• M8: 2,101,850 km (0.113 R)
• M9: 2,178,743 km (0.102 R)
• M10: 2,361,851 km (0.05 R)
• M11: 2,495,741 km (0.111 R)
• M12: 2,577,422 km (0.107 R)
• M13: 2,743,176 km (0.095 R)
• M14: 2,884,097 km (0.093 R)
• M15: 3,351,142 km (0.119 R)
• M16: 3,562,972 km (0.117 R)
• M17: 3,685,942 km (0.117 R)
• M18: 4,095,391 km (0.088 R)
• M19: 4,159,718 km (0.068 R)
• M20: 4,256,807 km (0.077 R)
• M21: 4,855,049 km (0.093 R)
• M22: 5,060,447 km (0.101 R)
• M23: 5,198,975 km (0.069 R)
• M24: 5,338,699 km (0.053 R)
• M25: 5,409,010 km (0.11 R)
• M26: 6,203,076 km (0.088 R)
• M27: 6,425,977 km (0.115 R)
• M28: 6,994,598 km (0.088 R)
• M29: 7,500,538 km (0.115 R)
• M30: 7,817,686 km (0.11 R)
• M31: 8,547,574 km (0.06 R)
• M32: 9,172,145 km (0.084 R)
• M33: 9,341,340 km (0.082 R)
• M34: 9,426,162 km (0.116 R)
• M35: 9,639,638 km (0.113 R)
• M36: 9,811,526 km (0.095 R)
• M37: 11,814,492 km (0.081 R)
• M38: 12,462,849 km (0.064 R)
• M39: 13,170,148 km (0.117 R)
• M40: 13,648,861 km (0.111 R)
• M41: 13,987,551 km (0.109 R)
• M42: 14,182,177 km (0.113 R)
• M43: 15,019,776 km (0.116 R)
• M44: 15,169,224 km (0.095 R)
• M45: 15,570,146 km (0.117 R)
• M46: 16,536,399 km (0.114 R)
• M47: 16,587,861 km (0.112 R)
• M48: 16,639,322 km (0.031 R)
• M49: 17,942,769 km (0.12 R)
• M50: 17,995,577 km (0.089 R)
• M51: 18,048,385 km (0.093 R)
• M52: 18,260,514 km (0.11 R)
• M53: 19,712,960 km (0.077 R)
• M54: 19,876,770 km (0.113 R)
• M55: 20,591,249 km (0.117 R)
• M56: 21,875,846 km (0.096 R)
• M57: 22,841,949 km (0.1 R)
• M58: 23,532,343 km (0.096 R)
• M59: 24,229,470 km (0.047 R)
• M60: 24,346,305 km (0.114 R)
• M61: 24,874,536 km (0.098 R)
• M62: 25,228,783 km (0.117 R)
• M63: 26,481,665 km (0.087 R)
• M64: 27,510,749 km (0.076 R)
• M65: 28,614,482 km (0.084 R)
• M66: 29,483,048 km (0.113 R)
• M67: 30,549,232 km (0.102 R)
• M68: 31,500,375 km (0.119 R)
• M69: 32,783,775 km (0.1 R)
• M70: 32,913,028 km (0.075 R)
• M71: 34,018,705 km (0.069 R)
• M72: 34,280,651 km (0.101 R)
• M73: 34,477,522 km (0.098 R)
• M74: 35,004,406 km (0.118 R)
• M75: 35,202,623 km (0.041 R)
• M76: 35,335,017 km (0.081 R)
• M77: 35,666,825 km (0.085 R)
• M78: 36,066,102 km (0.09 R)
• M79: 36,333,284 km (0.115 R)
• M80: 36,869,442 km (0.034 R)
• M81: 37,814,003 km (0.032 R)
• M82: 40,140,849 km (0.115 R)
• M83: 41,671,085 km (0.077 R)
• M84: 44,358,761 km (0.118 R)
• M85: 45,075,334 km (0.095 R)
• M86: 45,219,098 km (0.109 R)
• M87: 45,363,011 km (0.064 R)
• M88: 46,737,816 km (0.085 R)
• M89: 47,174,941 km (0.107 R)
• M90: 47,613,262 km (0.087 R)
• M91: 48,494,095 km (0.103 R)
• M92: 49,010,357 km (0.109 R)
• M93: 49,454,363 km (0.047 R)

Planet 7 - Ice Giant

Semi-Major Axis: 6.55 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 963.7

Radius: 5.1

Gravity: 37.05 G

Time & Orbit

Eccentricity (e): 0.208

Orbit Range: 5.19 AU - 7.91 AU

Year: 10824 Days

Day: 18.6 Hours

Environment

Temp: -214 °C

Axial Tilt: 33 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 56,619,847 km

• M1: 72,705 km (0.064 R)
• M2: 147,204 km (0.119 R)
• M3: 433,684 km (0.113 R)
• M4: 603,328 km (0.099 R)
• M5: 812,915 km (0.094 R)
• M6: 957,726 km (0.119 R)
• M7: 1,088,474 km (0.118 R)
• M8: 1,489,845 km (0.102 R)
• M9: 2,070,734 km (0.054 R)
• M10: 2,183,231 km (0.108 R)
• M11: 2,473,451 km (0.112 R)
• M12: 2,532,991 km (0.073 R)
• M13: 2,775,788 km (0.056 R)
• M14: 3,153,972 km (0.108 R)
• M15: 3,349,048 km (0.101 R)
• M16: 3,717,058 km (0.1 R)
• M17: 4,527,280 km (0.077 R)
• M18: 4,747,339 km (0.059 R)
• M19: 5,351,265 km (0.074 R)
• M20: 5,428,458 km (0.118 R)
• M21: 5,780,462 km (0.073 R)
• M22: 5,939,335 km (0.089 R)
• M23: 6,019,220 km (0.082 R)
• M24: 6,139,796 km (0.083 R)
• M25: 6,506,311 km (0.073 R)
• M26: 6,630,178 km (0.07 R)
• M27: 6,921,893 km (0.115 R)
• M28: 7,518,191 km (0.074 R)
• M29: 8,086,363 km (0.078 R)
• M30: 8,804,583 km (0.114 R)
• M31: 9,171,397 km (0.12 R)
• M32: 9,730,743 km (0.03 R)
• M33: 11,774,100 km (0.102 R)
• M34: 12,330,604 km (0.101 R)
• M35: 12,432,630 km (0.092 R)
• M36: 12,637,579 km (0.116 R)
• M37: 13,521,404 km (0.101 R)
• M38: 15,128,833 km (0.105 R)
• M39: 15,292,942 km (0.102 R)
• M40: 15,512,551 km (0.107 R)
• M41: 15,678,006 km (0.098 R)
• M42: 16,965,595 km (0.087 R)
• M43: 17,765,944 km (0.112 R)
• M44: 18,054,668 km (0.118 R)
• M45: 18,519,917 km (0.036 R)
• M46: 18,812,680 km (0.097 R)
• M47: 18,871,472 km (0.092 R)
• M48: 19,819,623 km (0.106 R)
• M49: 20,359,821 km (0.106 R)
• M50: 20,844,070 km (0.093 R)
• M51: 23,384,391 km (0.096 R)
• M52: 23,827,799 km (0.097 R)
• M53: 23,891,378 km (0.109 R)
• M54: 25,824,482 km (0.099 R)
• M55: 26,545,843 km (0.049 R)
• M56: 27,008,400 km (0.074 R)
• M57: 27,074,671 km (0.094 R)
• M58: 28,008,312 km (0.11 R)
• M59: 28,411,628 km (0.097 R)
• M60: 29,633,244 km (0.098 R)
• M61: 32,338,273 km (0.088 R)
• M62: 32,973,615 km (0.1 R)
• M63: 34,688,006 km (0.059 R)
• M64: 34,904,325 km (0.067 R)
• M65: 35,846,941 km (0.115 R)
• M66: 37,018,591 km (0.052 R)
• M67: 38,351,509 km (0.063 R)
• M68: 38,426,008 km (0.089 R)
• M69: 39,926,325 km (0.095 R)
• M70: 40,228,812 km (0.116 R)
• M71: 40,531,897 km (0.091 R)
• M72: 42,135,736 km (0.103 R)
• M73: 42,443,609 km (0.09 R)
• M74: 42,520,652 km (0.118 R)
• M75: 42,984,106 km (0.051 R)
• M76: 43,371,564 km (0.092 R)
• M77: 43,682,429 km (0.069 R)
• M78: 44,150,072 km (0.102 R)
• M79: 44,306,252 km (0.093 R)
• M80: 44,384,491 km (0.09 R)
• M81: 45,326,360 km (0.071 R)
• M82: 45,957,962 km (0.057 R)
• M83: 47,070,222 km (0.096 R)
• M84: 48,110,974 km (0.081 R)
• M85: 48,191,308 km (0.104 R)
• M86: 48,513,243 km (0.064 R)
• M87: 48,593,727 km (0.044 R)
• M88: 48,835,776 km (0.067 R)
• M89: 49,321,072 km (0.056 R)
• M90: 49,889,394 km (0.071 R)
• M91: 51,196,131 km (0.065 R)
• M92: 54,512,267 km (0.105 R)
• M93: 56,619,802 km (0.111 R)

Kuiper Belt

Range: 30 - 46 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 200 - 11,214 AU

Composition

Type: Cometary Reservoir

System's final boundary, containing trillions of icy planetesimals.

Gravitational Limit