🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.5 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.67

Radius: 1.68

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.019

Orbit Range: 0.49 AU - 0.51 AU

Year: 228 Days

Day: 20.6 Hours

Environment

Temp: -118 °C

Axial Tilt: 11.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 29,547,471 km

• M1: 64,925 km (0.109 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.63 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.72

Radius: 1.86

Gravity: 1.36 G

Time & Orbit

Eccentricity (e): 0.209

Orbit Range: 0.5 AU - 0.76 AU

Year: 323 Days

Day: 25.7 Hours

Environment

Temp: -122 °C

Axial Tilt: 6.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 29,547,471 km

• M1: 652,995 km (0.089 R)

Asteroid Belt

Center: 0.92 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 3 - Gas Giant

Semi-Major Axis: 1.21 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 538.1

Radius: 13.1

Gravity: 3.14 G

Time & Orbit

Eccentricity (e): 0.055

Orbit Range: 1.14 AU - 1.28 AU

Year: 859 Days

Day: 9.4 Hours

Environment

Temp: -165 °C

Axial Tilt: 10 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 29,547,471 km

• M1: 175,478 km (0.115 R)
• M2: 277,953 km (0.076 R)
• M3: 394,938 km (0.111 R)
• M4: 522,994 km (0.094 R)
• M5: 610,359 km (0.096 R)
• M6: 755,170 km (0.087 R)
• M7: 1,076,805 km (0.114 R)
• M8: 1,187,657 km (0.079 R)
• M9: 1,309,131 km (0.105 R)
• M10: 1,394,851 km (0.104 R)
• M11: 1,489,396 km (0.076 R)
• M12: 1,614,311 km (0.045 R)
• M13: 1,706,912 km (0.098 R)
• M14: 1,867,879 km (0.044 R)
• M15: 1,988,156 km (0.067 R)
• M16: 2,118,904 km (0.104 R)
• M17: 2,316,673 km (0.073 R)
• M18: 2,446,524 km (0.106 R)
• M19: 2,868,240 km (0.05 R)
• M20: 2,964,282 km (0.065 R)
• M21: 3,249,565 km (0.118 R)
• M22: 3,358,921 km (0.073 R)
• M23: 3,469,623 km (0.077 R)
• M24: 3,675,620 km (0.057 R)
• M25: 3,828,060 km (0.048 R)
• M26: 3,982,595 km (0.044 R)
• M27: 4,278,200 km (0.108 R)
• M28: 4,428,695 km (0.109 R)
• M29: 4,621,826 km (0.076 R)
• M30: 4,724,600 km (0.114 R)
• M31: 4,911,747 km (0.084 R)
• M32: 5,133,002 km (0.095 R)
• M33: 5,282,450 km (0.048 R)
• M34: 6,621,950 km (0.088 R)
• M35: 7,245,773 km (0.063 R)
• M36: 7,462,091 km (0.108 R)
• M37: 7,619,468 km (0.115 R)
• M38: 7,827,110 km (0.12 R)
• M39: 7,937,813 km (0.048 R)
• M40: 8,198,113 km (0.095 R)
• M41: 8,461,256 km (0.083 R)
• M42: 8,587,666 km (0.12 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.25 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 357.5

Radius: 10.5

Gravity: 3.24 G

Time & Orbit

Eccentricity (e): 0.206

Orbit Range: 0.99 AU - 1.51 AU

Year: 902 Days

Day: 6 Hours

Environment

Temp: -171 °C

Axial Tilt: 39 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (53)

Outer Limit: 29,547,471 km

• M1: 134,189 km (0.063 R)
• M2: 208,390 km (0.059 R)
• M3: 287,378 km (0.119 R)
• M4: 405,261 km (0.032 R)
• M5: 484,248 km (0.119 R)
• M6: 694,134 km (0.036 R)
• M7: 854,653 km (0.102 R)
• M8: 929,003 km (0.111 R)
• M9: 1,033,721 km (0.099 R)
• M10: 1,142,629 km (0.077 R)
• M11: 1,267,692 km (0.114 R)
• M12: 1,335,011 km (0.081 R)
• M13: 1,410,110 km (0.117 R)
• M14: 1,518,867 km (0.103 R)
• M15: 1,793,080 km (0.068 R)
• M16: 1,897,499 km (0.06 R)
• M17: 1,982,621 km (0.099 R)
• M18: 2,076,119 km (0.08 R)
• M19: 2,496,639 km (0.093 R)
• M20: 2,629,482 km (0.07 R)
• M21: 2,797,031 km (0.095 R)
• M22: 3,017,688 km (0.088 R)
• M23: 3,092,637 km (0.118 R)
• M24: 3,176,412 km (0.08 R)
• M25: 3,269,611 km (0.093 R)
• M26: 3,554,745 km (0.033 R)
• M27: 3,678,312 km (0.072 R)
• M28: 3,776,299 km (0.118 R)
• M29: 3,848,106 km (0.076 R)
• M30: 3,920,362 km (0.119 R)
• M31: 4,121,571 km (0.085 R)
• M32: 4,307,521 km (0.106 R)
• M33: 4,410,893 km (0.088 R)
• M34: 4,486,739 km (0.092 R)
• M35: 4,639,479 km (0.081 R)
• M36: 4,735,969 km (0.083 R)
• M37: 4,803,887 km (0.105 R)
• M38: 4,881,827 km (0.041 R)
• M39: 5,048,928 km (0.086 R)
• M40: 5,298,308 km (0.095 R)
• M41: 5,378,941 km (0.03 R)
• M42: 5,695,341 km (0.114 R)
• M43: 6,038,817 km (0.096 R)
• M44: 6,144,284 km (0.058 R)
• M45: 6,229,106 km (0.087 R)
• M46: 6,378,404 km (0.068 R)
• M47: 6,680,742 km (0.096 R)
• M48: 6,998,787 km (0.037 R)
• M49: 7,098,419 km (0.111 R)
• M50: 7,187,430 km (0.081 R)
• M51: 7,411,827 km (0.078 R)
• M52: 7,524,773 km (0.111 R)
• M53: 7,729,572 km (0.1 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.24 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 461

Radius: 12.7

Gravity: 2.86 G

Time & Orbit

Eccentricity (e): 0.226

Orbit Range: 1.73 AU - 2.75 AU

Year: 2165 Days

Day: 9.9 Hours

Environment

Temp: -185 °C

Axial Tilt: 39.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (56)

Outer Limit: 29,547,471 km

• M1: 158,424 km (0.085 R)
• M2: 291,566 km (0.105 R)
• M3: 417,827 km (0.112 R)
• M4: 624,721 km (0.065 R)
• M5: 719,566 km (0.104 R)
• M6: 1,208,302 km (0.05 R)
• M7: 1,311,973 km (0.044 R)
• M8: 1,408,913 km (0.104 R)
• M9: 1,528,591 km (0.108 R)
• M10: 1,714,840 km (0.06 R)
• M11: 1,843,345 km (0.118 R)
• M12: 2,053,680 km (0.06 R)
• M13: 2,462,082 km (0.1 R)
• M14: 2,583,555 km (0.075 R)
• M15: 2,669,724 km (0.097 R)
• M16: 2,756,939 km (0.093 R)
• M17: 2,845,202 km (0.085 R)
• M18: 3,327,655 km (0.116 R)
• M19: 3,476,056 km (0.097 R)
• M20: 3,737,852 km (0.1 R)
• M21: 4,280,743 km (0.112 R)
• M22: 4,833,208 km (0.059 R)
• M23: 5,203,912 km (0.058 R)
• M24: 5,487,998 km (0.08 R)
• M25: 5,907,321 km (0.075 R)
• M26: 6,038,518 km (0.06 R)
• M27: 6,220,429 km (0.083 R)
• M28: 6,354,020 km (0.112 R)
• M29: 6,606,840 km (0.05 R)
• M30: 6,811,640 km (0.101 R)
• M31: 7,350,192 km (0.098 R)
• M32: 7,473,760 km (0.048 R)
• M33: 7,920,609 km (0.107 R)
• M34: 8,029,217 km (0.091 R)
• M35: 8,302,831 km (0.115 R)
• M36: 8,468,436 km (0.101 R)
• M37: 8,672,488 km (0.086 R)
• M38: 8,821,786 km (0.054 R)
• M39: 9,562,296 km (0.039 R)
• M40: 10,047,591 km (0.102 R)
• M41: 10,322,851 km (0.104 R)
• M42: 10,401,839 km (0.082 R)
• M43: 10,820,564 km (0.08 R)
• M44: 11,346,550 km (0.091 R)
• M45: 11,489,565 km (0.059 R)
• M46: 11,798,186 km (0.029 R)
• M47: 11,901,558 km (0.113 R)
• M48: 12,234,712 km (0.081 R)
• M49: 12,528,822 km (0.066 R)
• M50: 13,188,249 km (0.089 R)
• M51: 13,338,595 km (0.026 R)
• M52: 13,619,689 km (0.089 R)
• M53: 13,990,094 km (0.057 R)
• M54: 14,209,404 km (0.031 R)
• M55: 14,474,342 km (0.041 R)
• M56: 14,585,194 km (0.112 R)

Planet 6 - Gas Giant

Semi-Major Axis: 2.55 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 272.4

Radius: 12.1

Gravity: 1.86 G

Time & Orbit

Eccentricity (e): 0.005

Orbit Range: 2.54 AU - 2.56 AU

Year: 2629 Days

Day: 12.9 Hours

Environment

Temp: -190 °C

Axial Tilt: 43.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (62)

Outer Limit: 29,547,471 km

• M1: 155,582 km (0.111 R)
• M2: 269,276 km (0.12 R)
• M3: 505,192 km (0.113 R)
• M4: 852,708 km (0.047 R)
• M5: 1,092,513 km (0.067 R)
• M6: 1,216,530 km (0.067 R)
• M7: 1,336,059 km (0.118 R)
• M8: 1,498,671 km (0.094 R)
• M9: 1,791,734 km (0.118 R)
• M10: 1,950,756 km (0.116 R)
• M11: 2,037,373 km (0.052 R)
• M12: 2,147,777 km (0.118 R)
• M13: 2,271,494 km (0.104 R)
• M14: 2,621,403 km (0.115 R)
• M15: 2,705,627 km (0.113 R)
• M16: 2,802,866 km (0.043 R)
• M17: 2,951,117 km (0.094 R)
• M18: 3,064,064 km (0.113 R)
• M19: 3,346,355 km (0.11 R)
• M20: 3,704,492 km (0.076 R)
• M21: 3,840,177 km (0.072 R)
• M22: 4,033,159 km (0.118 R)
• M23: 4,130,846 km (0.101 R)
• M24: 4,229,431 km (0.037 R)
• M25: 4,357,188 km (0.093 R)
• M26: 4,645,911 km (0.048 R)
• M27: 4,733,875 km (0.106 R)
• M28: 4,851,908 km (0.05 R)
• M29: 5,410,506 km (0.099 R)
• M30: 5,689,805 km (0.051 R)
• M31: 6,005,756 km (0.053 R)
• M32: 6,085,492 km (0.113 R)
• M33: 6,408,623 km (0.032 R)
• M34: 6,638,256 km (0.058 R)
• M35: 6,737,439 km (0.08 R)
• M36: 6,903,942 km (0.086 R)
• M37: 7,309,053 km (0.113 R)
• M38: 7,669,883 km (0.037 R)
• M39: 7,756,799 km (0.098 R)
• M40: 8,001,541 km (0.102 R)
• M41: 8,213,372 km (0.089 R)
• M42: 8,391,393 km (0.09 R)
• M43: 8,642,718 km (0.118 R)
• M44: 8,751,176 km (0.099 R)
• M45: 8,933,087 km (0.092 R)
• M46: 9,356,000 km (0.112 R)
• M47: 9,486,001 km (0.096 R)
• M48: 9,955,439 km (0.049 R)
• M49: 10,202,575 km (0.114 R)
• M50: 10,547,996 km (0.041 R)
• M51: 10,702,830 km (0.096 R)
• M52: 11,171,819 km (0.062 R)
• M53: 11,270,404 km (0.088 R)
• M54: 11,667,437 km (0.03 R)
• M55: 12,008,670 km (0.12 R)
• M56: 12,353,194 km (0.097 R)
• M57: 12,434,725 km (0.109 R)
• M58: 12,741,999 km (0.114 R)
• M59: 12,824,427 km (0.082 R)
• M60: 13,531,875 km (0.073 R)
• M61: 13,742,360 km (0.082 R)
• M62: 14,123,984 km (0.081 R)

Planet 7 - Gas Giant

Semi-Major Axis: 3.37 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 16.5

Radius: 11.8

Gravity: 0.12 G

Time & Orbit

Eccentricity (e): 0.199

Orbit Range: 2.7 AU - 4.04 AU

Year: 3994 Days

Day: 12.4 Hours

Environment

Temp: -216 °C

Axial Tilt: 13.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (37)

Outer Limit: 29,547,471 km

• M1: 229,034 km (0.081 R)
• M2: 310,266 km (0.107 R)
• M3: 386,561 km (0.103 R)
• M4: 503,846 km (0.085 R)
• M5: 751,580 km (0.078 R)
• M6: 825,032 km (0.08 R)
• M7: 1,061,397 km (0.069 R)
• M8: 1,179,579 km (0.117 R)
• M9: 1,260,960 km (0.086 R)
• M10: 1,350,270 km (0.111 R)
• M11: 1,586,934 km (0.095 R)
• M12: 1,710,352 km (0.119 R)
• M13: 1,905,278 km (0.105 R)
• M14: 2,229,756 km (0.046 R)
• M15: 2,354,222 km (0.081 R)
• M16: 2,640,851 km (0.064 R)
• M17: 2,765,017 km (0.033 R)
• M18: 3,289,657 km (0.108 R)
• M19: 3,559,532 km (0.12 R)
• M20: 3,645,251 km (0.08 R)
• M21: 3,766,725 km (0.116 R)
• M22: 3,880,569 km (0.116 R)
• M23: 4,049,166 km (0.096 R)
• M24: 4,183,953 km (0.032 R)
• M25: 4,421,215 km (0.071 R)
• M26: 4,681,665 km (0.091 R)
• M27: 4,985,648 km (0.058 R)
• M28: 5,111,011 km (0.091 R)
• M29: 5,237,421 km (0.106 R)
• M30: 5,424,120 km (0.118 R)
• M31: 5,533,176 km (0.028 R)
• M32: 6,110,175 km (0.114 R)
• M33: 6,275,631 km (0.057 R)
• M34: 6,642,744 km (0.071 R)
• M35: 6,812,986 km (0.092 R)
• M36: 6,952,262 km (0.055 R)
• M37: 7,255,796 km (0.097 R)

Planet 8 - Gas Giant

Semi-Major Axis: 4.68 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 126.5

Radius: 8.1

Gravity: 1.93 G

Time & Orbit

Eccentricity (e): 0.173

Orbit Range: 3.87 AU - 5.49 AU

Year: 6537 Days

Day: 13.1 Hours

Environment

Temp: -222 °C

Axial Tilt: 39.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 29,547,471 km

• M1: 102,624 km (0.092 R)
• M2: 270,623 km (0.08 R)
• M3: 432,039 km (0.117 R)
• M4: 529,427 km (0.099 R)
• M5: 590,014 km (0.056 R)
• M6: 747,690 km (0.118 R)
• M7: 888,163 km (0.118 R)
• M8: 1,026,690 km (0.119 R)
• M9: 1,093,112 km (0.067 R)
• M10: 1,161,029 km (0.102 R)
• M11: 1,361,341 km (0.085 R)
• M12: 2,069,537 km (0.079 R)
• M13: 2,860,162 km (0.077 R)
• M14: 3,067,355 km (0.089 R)
• M15: 3,213,512 km (0.088 R)
• M16: 3,312,396 km (0.086 R)
• M17: 3,445,688 km (0.075 R)
• M18: 3,597,829 km (0.067 R)
• M19: 3,683,399 km (0.082 R)
• M20: 3,856,484 km (0.091 R)
• M21: 3,979,154 km (0.095 R)
• M22: 4,085,518 km (0.094 R)
• M23: 4,575,301 km (0.033 R)
• M24: 4,705,302 km (0.074 R)
• M25: 4,988,191 km (0.074 R)
• M26: 5,295,914 km (0.057 R)
• M27: 5,354,407 km (0.074 R)
• M28: 5,789,288 km (0.072 R)
• M29: 5,849,576 km (0.107 R)
• M30: 5,990,796 km (0.114 R)
• M31: 6,256,183 km (0.108 R)
• M32: 6,483,721 km (0.089 R)
• M33: 6,546,253 km (0.076 R)
• M34: 6,609,084 km (0.089 R)
• M35: 6,672,065 km (0.079 R)
• M36: 7,161,250 km (0.117 R)
• M37: 7,312,494 km (0.096 R)
• M38: 7,530,308 km (0.094 R)
• M39: 7,750,366 km (0.1 R)
• M40: 8,219,356 km (0.062 R)
• M41: 8,332,302 km (0.102 R)
• M42: 8,882,074 km (0.109 R)
• M43: 9,208,048 km (0.09 R)
• M44: 9,278,509 km (0.102 R)
• M45: 9,419,729 km (0.068 R)
• M46: 9,919,984 km (0.06 R)
• M47: 10,502,369 km (0.088 R)
• M48: 10,871,876 km (0.093 R)
• M49: 11,145,640 km (0.052 R)
• M50: 11,295,836 km (0.118 R)
• M51: 11,878,071 km (0.054 R)
• M52: 11,980,396 km (0.12 R)
• M53: 12,108,601 km (0.081 R)
• M54: 12,340,628 km (0.061 R)
• M55: 12,444,149 km (0.053 R)
• M56: 12,678,270 km (0.079 R)
• M57: 12,809,018 km (0.068 R)
• M58: 12,966,395 km (0.102 R)
• M59: 13,230,286 km (0.109 R)
• M60: 13,656,042 km (0.103 R)
• M61: 13,843,787 km (0.057 R)
• M62: 14,059,357 km (0.097 R)
• M63: 14,113,362 km (0.107 R)
• M64: 14,194,594 km (0.051 R)
• M65: 14,960,385 km (0.095 R)
• M66: 15,126,140 km (0.056 R)
• M67: 15,209,316 km (0.09 R)
• M68: 15,599,318 km (0.119 R)
• M69: 15,908,088 km (0.107 R)
• M70: 17,047,725 km (0.113 R)
• M71: 17,540,051 km (0.032 R)
• M72: 17,744,103 km (0.104 R)
• M73: 17,978,373 km (0.106 R)
• M74: 18,302,103 km (0.076 R)
• M75: 19,616,021 km (0.031 R)
• M76: 20,192,870 km (0.115 R)
• M77: 20,314,942 km (0.11 R)
• M78: 20,529,316 km (0.112 R)

Planet 9 - Gas Giant

Semi-Major Axis: 4.82 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 343.7

Radius: 8.8

Gravity: 4.44 G

Time & Orbit

Eccentricity (e): 0.232

Orbit Range: 3.7 AU - 5.94 AU

Year: 6833 Days

Day: 10.5 Hours

Environment

Temp: -220 °C

Axial Tilt: 27 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (67)

Outer Limit: 29,547,471 km

• M1: 123,119 km (0.114 R)
• M2: 205,547 km (0.08 R)
• M3: 788,082 km (0.088 R)
• M4: 851,810 km (0.093 R)
• M5: 1,082,490 km (0.041 R)
• M6: 1,363,884 km (0.08 R)
• M7: 1,569,581 km (0.095 R)
• M8: 2,100,504 km (0.107 R)
• M9: 2,509,055 km (0.098 R)
• M10: 2,683,487 km (0.097 R)
• M11: 2,762,175 km (0.102 R)
• M12: 2,881,853 km (0.065 R)
• M13: 3,064,662 km (0.116 R)
• M14: 3,126,446 km (0.111 R)
• M15: 3,251,211 km (0.076 R)
• M16: 3,335,434 km (0.097 R)
• M17: 3,789,164 km (0.087 R)
• M18: 3,877,876 km (0.027 R)
• M19: 4,826,177 km (0.077 R)
• M20: 5,313,866 km (0.104 R)
• M21: 6,074,870 km (0.088 R)
• M22: 6,205,020 km (0.066 R)
• M23: 6,734,896 km (0.114 R)
• M24: 7,389,836 km (0.039 R)
• M25: 8,237,008 km (0.111 R)
• M26: 8,701,360 km (0.1 R)
• M27: 8,818,794 km (0.107 R)
• M28: 8,936,678 km (0.116 R)
• M29: 9,114,549 km (0.049 R)
• M30: 9,174,239 km (0.072 R)
• M31: 9,263,848 km (0.116 R)
• M32: 9,625,127 km (0.092 R)
• M33: 9,899,190 km (0.095 R)
• M34: 11,179,898 km (0.102 R)
• M35: 11,403,696 km (0.073 R)
• M36: 12,051,455 km (0.101 R)
• M37: 12,644,760 km (0.045 R)
• M38: 12,811,113 km (0.112 R)
• M39: 12,978,363 km (0.037 R)
• M40: 13,722,613 km (0.104 R)
• M41: 14,203,420 km (0.1 R)
• M42: 14,550,338 km (0.077 R)
• M43: 14,759,775 km (0.071 R)
• M44: 15,146,336 km (0.095 R)
• M45: 15,358,615 km (0.102 R)
• M46: 15,607,546 km (0.057 R)
• M47: 15,714,658 km (0.102 R)
• M48: 16,507,527 km (0.109 R)
• M49: 16,725,940 km (0.088 R)
• M50: 17,424,113 km (0.078 R)
• M51: 17,646,565 km (0.116 R)
• M52: 17,795,415 km (0.082 R)
• M53: 17,869,914 km (0.114 R)
• M54: 18,508,099 km (0.076 R)
• M55: 18,583,646 km (0.088 R)
• M56: 19,306,503 km (0.114 R)
• M57: 21,649,355 km (0.109 R)
• M58: 22,088,425 km (0.106 R)
• M59: 23,341,905 km (0.061 R)
• M60: 23,751,205 km (0.04 R)
• M61: 25,664,113 km (0.044 R)
• M62: 25,917,233 km (0.115 R)
• M63: 26,511,286 km (0.114 R)
• M64: 27,928,875 km (0.026 R)
• M65: 28,232,709 km (0.105 R)
• M66: 28,756,301 km (0.08 R)
• M67: 29,503,393 km (0.1 R)

Kuiper Belt

Range: 30 - 51 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 386 - 19,006 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit