🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.27 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Terrestrial

Semi-Major Axis: 0.54 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.39

Radius: 1.63

Gravity: 1.28 G

Time & Orbit

Eccentricity (e): 0.002

Orbit Range: 0.54 AU - 0.54 AU

Year: 252 Days

Day: 32.2 Hours

Environment

Temp: -118 °C

Axial Tilt: 4.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Terrestrial

Semi-Major Axis: 0.57 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.09

Radius: 1.34

Gravity: 1.16 G

Time & Orbit

Eccentricity (e): 0.204

Orbit Range: 0.45 AU - 0.69 AU

Year: 274 Days

Day: 13.1 Hours

Environment

Temp: -122 °C

Axial Tilt: 25 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (2)

Outer Limit: 24,305,445 km

• M1: 142,866 km (0.119 R)
• M2: 313,557 km (0.11 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.81 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 539.8

Radius: 9.2

Gravity: 6.38 G

Time & Orbit

Eccentricity (e): 0.148

Orbit Range: 0.69 AU - 0.93 AU

Year: 464 Days

Day: 7 Hours

Environment

Temp: -139 °C

Axial Tilt: 10 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (45)

Outer Limit: 24,305,445 km

• M1: 205,099 km (0.114 R)
• M2: 275,709 km (0.054 R)
• M3: 341,382 km (0.099 R)
• M4: 410,796 km (0.089 R)
• M5: 472,729 km (0.028 R)
• M6: 531,372 km (0.088 R)
• M7: 618,886 km (0.03 R)
• M8: 764,445 km (0.119 R)
• M9: 912,996 km (0.084 R)
• M10: 1,002,306 km (0.106 R)
• M11: 1,061,995 km (0.047 R)
• M12: 1,298,510 km (0.034 R)
• M13: 1,446,611 km (0.088 R)
• M14: 1,578,856 km (0.041 R)
• M15: 1,643,781 km (0.087 R)
• M16: 1,737,280 km (0.027 R)
• M17: 1,838,259 km (0.118 R)
• M18: 1,901,090 km (0.104 R)
• M19: 1,993,691 km (0.084 R)
• M20: 2,087,788 km (0.084 R)
• M21: 2,225,867 km (0.097 R)
• M22: 2,397,904 km (0.077 R)
• M23: 2,536,282 km (0.075 R)
• M24: 2,625,742 km (0.113 R)
• M25: 2,775,041 km (0.079 R)
• M26: 2,874,074 km (0.119 R)
• M27: 2,967,423 km (0.058 R)
• M28: 3,068,552 km (0.079 R)
• M29: 3,435,515 km (0.095 R)
• M30: 3,549,060 km (0.056 R)
• M31: 3,634,929 km (0.053 R)
• M32: 3,700,004 km (0.096 R)
• M33: 3,882,364 km (0.1 R)
• M34: 4,030,615 km (0.092 R)
• M35: 4,120,374 km (0.074 R)
• M36: 4,180,512 km (0.099 R)
• M37: 4,248,729 km (0.108 R)
• M38: 4,401,469 km (0.108 R)
• M39: 4,470,732 km (0.057 R)
• M40: 4,704,554 km (0.105 R)
• M41: 4,886,465 km (0.076 R)
• M42: 4,950,343 km (0.045 R)
• M43: 5,046,684 km (0.092 R)
• M44: 5,200,321 km (0.118 R)
• M45: 5,454,638 km (0.106 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.13 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 769.4

Radius: 14.4

Gravity: 3.71 G

Time & Orbit

Eccentricity (e): 0.174

Orbit Range: 0.93 AU - 1.33 AU

Year: 764 Days

Day: 7.7 Hours

Environment

Temp: -168 °C

Axial Tilt: 20.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (43)

Outer Limit: 24,305,445 km

• M1: 184,155 km (0.12 R)
• M2: 311,463 km (0.09 R)
• M3: 428,448 km (0.097 R)
• M4: 521,947 km (0.055 R)
• M5: 629,657 km (0.077 R)
• M6: 752,178 km (0.088 R)
• M7: 884,273 km (0.069 R)
• M8: 983,008 km (0.106 R)
• M9: 1,073,814 km (0.094 R)
• M10: 1,180,477 km (0.06 R)
• M11: 1,378,245 km (0.061 R)
• M12: 1,674,299 km (0.067 R)
• M13: 1,815,221 km (0.076 R)
• M14: 2,133,415 km (0.113 R)
• M15: 2,419,596 km (0.111 R)
• M16: 2,512,047 km (0.059 R)
• M17: 2,674,960 km (0.099 R)
• M18: 3,002,429 km (0.078 R)
• M19: 3,258,990 km (0.097 R)
• M20: 3,465,734 km (0.095 R)
• M21: 3,852,893 km (0.079 R)
• M22: 4,001,743 km (0.057 R)
• M23: 4,418,523 km (0.103 R)
• M24: 4,700,814 km (0.101 R)
• M25: 4,892,299 km (0.098 R)
• M26: 5,075,557 km (0.086 R)
• M27: 5,338,101 km (0.05 R)
• M28: 5,616,652 km (0.107 R)
• M29: 6,003,063 km (0.046 R)
• M30: 6,095,216 km (0.085 R)
• M31: 6,634,666 km (0.068 R)
• M32: 6,922,193 km (0.049 R)
• M33: 7,043,217 km (0.08 R)
• M34: 7,299,778 km (0.112 R)
• M35: 7,497,396 km (0.109 R)
• M36: 7,596,879 km (0.036 R)
• M37: 7,897,870 km (0.073 R)
• M38: 8,075,293 km (0.067 R)
• M39: 8,292,509 km (0.119 R)
• M40: 8,382,567 km (0.09 R)
• M41: 8,667,701 km (0.055 R)
• M42: 8,811,464 km (0.046 R)
• M43: 8,955,976 km (0.11 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 654.9

Radius: 14.7

Gravity: 3.03 G

Time & Orbit

Eccentricity (e): 0.062

Orbit Range: 1.25 AU - 1.41 AU

Year: 975 Days

Day: 7.3 Hours

Environment

Temp: -178 °C

Axial Tilt: 45.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (53)

Outer Limit: 24,305,445 km

• M1: 241,750 km (0.111 R)
• M2: 517,010 km (0.117 R)
• M3: 708,346 km (0.06 R)
• M4: 805,585 km (0.098 R)
• M5: 901,776 km (0.051 R)
• M6: 996,322 km (0.044 R)
• M7: 1,217,128 km (0.107 R)
• M8: 1,366,577 km (0.118 R)
• M9: 1,477,429 km (0.113 R)
• M10: 1,599,201 km (0.101 R)
• M11: 1,878,052 km (0.049 R)
• M12: 2,199,089 km (0.055 R)
• M13: 2,411,218 km (0.082 R)
• M14: 2,602,554 km (0.111 R)
• M15: 2,723,728 km (0.115 R)
• M16: 2,837,124 km (0.085 R)
• M17: 2,942,590 km (0.1 R)
• M18: 3,108,345 km (0.049 R)
• M19: 3,267,068 km (0.033 R)
• M20: 3,428,783 km (0.066 R)
• M21: 3,531,108 km (0.042 R)
• M22: 3,676,218 km (0.12 R)
• M23: 3,823,422 km (0.099 R)
• M24: 3,972,571 km (0.08 R)
• M25: 4,178,119 km (0.114 R)
• M26: 4,442,907 km (0.102 R)
• M27: 4,713,380 km (0.045 R)
• M28: 4,873,749 km (0.083 R)
• M29: 5,188,054 km (0.103 R)
• M30: 5,401,381 km (0.046 R)
• M31: 5,521,059 km (0.11 R)
• M32: 5,739,023 km (0.091 R)
• M33: 5,873,512 km (0.04 R)
• M34: 5,984,513 km (0.12 R)
• M35: 6,120,946 km (0.039 R)
• M36: 6,283,709 km (0.05 R)
• M37: 6,460,534 km (0.082 R)
• M38: 6,613,423 km (0.118 R)
• M39: 6,767,508 km (0.116 R)
• M40: 7,223,932 km (0.072 R)
• M41: 7,329,697 km (0.115 R)
• M42: 7,422,598 km (0.058 R)
• M43: 7,757,846 km (0.114 R)
• M44: 7,906,995 km (0.118 R)
• M45: 8,029,666 km (0.116 R)
• M46: 8,153,084 km (0.07 R)
• M47: 8,360,127 km (0.092 R)
• M48: 8,457,216 km (0.1 R)
• M49: 8,835,849 km (0.054 R)
• M50: 8,949,094 km (0.075 R)
• M51: 9,105,574 km (0.096 R)
• M52: 9,537,014 km (0.065 R)
• M53: 9,887,073 km (0.091 R)

Planet 6 - Gas Giant

Semi-Major Axis: 1.67 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 980.1

Radius: 11

Gravity: 8.1 G

Time & Orbit

Eccentricity (e): 0.219

Orbit Range: 1.3 AU - 2.04 AU

Year: 1372 Days

Day: 11.6 Hours

Environment

Temp: -177 °C

Axial Tilt: 39 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 24,305,445 km

• M1: 141,819 km (0.115 R)
• M2: 295,905 km (0.107 R)
• M3: 435,031 km (0.096 R)
• M4: 593,604 km (0.091 R)
• M5: 713,731 km (0.099 R)
• M6: 1,022,202 km (0.1 R)
• M7: 1,108,071 km (0.093 R)
• M8: 1,615,507 km (0.092 R)
• M9: 1,727,257 km (0.069 R)
• M10: 1,799,662 km (0.103 R)
• M11: 2,045,452 km (0.045 R)
• M12: 2,144,635 km (0.079 R)
• M13: 2,245,464 km (0.091 R)
• M14: 2,336,569 km (0.093 R)
• M15: 2,452,059 km (0.056 R)
• M16: 2,629,033 km (0.115 R)
• M17: 2,725,224 km (0.087 R)
• M18: 2,834,880 km (0.051 R)
• M19: 2,921,198 km (0.073 R)
• M20: 3,033,396 km (0.117 R)
• M21: 3,109,093 km (0.1 R)
• M22: 3,314,042 km (0.086 R)
• M23: 3,683,399 km (0.11 R)
• M24: 3,777,945 km (0.072 R)
• M25: 3,983,043 km (0.112 R)
• M26: 4,347,464 km (0.093 R)
• M27: 4,433,183 km (0.091 R)
• M28: 4,562,585 km (0.07 R)
• M29: 4,751,976 km (0.058 R)
• M30: 4,855,049 km (0.102 R)
• M31: 4,943,910 km (0.045 R)
• M32: 5,018,560 km (0.063 R)
• M33: 5,229,194 km (0.103 R)
• M34: 5,320,448 km (0.072 R)
• M35: 5,442,819 km (0.107 R)
• M36: 5,519,862 km (0.071 R)
• M37: 5,628,321 km (0.112 R)
• M38: 5,753,085 km (0.025 R)
• M39: 6,261,568 km (0.062 R)
• M40: 6,570,338 km (0.107 R)
• M41: 6,652,468 km (0.087 R)
• M42: 7,118,465 km (0.11 R)
• M43: 7,321,619 km (0.105 R)
• M44: 7,646,994 km (0.1 R)
• M45: 7,889,792 km (0.069 R)
• M46: 7,959,654 km (0.113 R)
• M47: 8,135,132 km (0.09 R)
• M48: 8,294,155 km (0.05 R)
• M49: 8,383,016 km (0.106 R)
• M50: 8,651,394 km (0.119 R)
• M51: 8,813,858 km (0.073 R)
• M52: 9,344,033 km (0.111 R)
• M53: 9,455,034 km (0.09 R)
• M54: 9,529,235 km (0.093 R)
• M55: 9,828,281 km (0.091 R)
• M56: 9,941,227 km (0.099 R)
• M57: 10,130,319 km (0.088 R)
• M58: 10,263,461 km (0.075 R)
• M59: 10,358,905 km (0.102 R)
• M60: 11,093,879 km (0.12 R)
• M61: 11,191,866 km (0.101 R)
• M62: 11,566,907 km (0.076 R)
• M63: 11,865,804 km (0.034 R)
• M64: 11,945,988 km (0.102 R)
• M65: 12,532,412 km (0.097 R)
• M66: 13,128,410 km (0.096 R)
• M67: 13,232,081 km (0.097 R)
• M68: 13,419,378 km (0.091 R)
• M69: 13,523,797 km (0.101 R)
• M70: 14,050,232 km (0.093 R)
• M71: 14,156,297 km (0.116 R)
• M72: 14,262,511 km (0.102 R)

Planet 7 - Gas Giant

Semi-Major Axis: 1.76 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 238.8

Radius: 15

Gravity: 1.06 G

Time & Orbit

Eccentricity (e): 0.134

Orbit Range: 1.52 AU - 2 AU

Year: 1485 Days

Day: 11.6 Hours

Environment

Temp: -178 °C

Axial Tilt: 23.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (41)

Outer Limit: 24,305,445 km

• M1: 195,824 km (0.059 R)
• M2: 312,660 km (0.116 R)
• M3: 475,422 km (0.081 R)
• M4: 591,360 km (0.081 R)
• M5: 719,865 km (0.1 R)
• M6: 836,402 km (0.095 R)
• M7: 1,117,346 km (0.076 R)
• M8: 1,283,550 km (0.106 R)
• M9: 1,380,489 km (0.108 R)
• M10: 1,545,645 km (0.1 R)
• M11: 1,725,312 km (0.082 R)
• M12: 1,833,621 km (0.115 R)
• M13: 1,992,344 km (0.071 R)
• M14: 2,131,171 km (0.117 R)
• M15: 2,290,194 km (0.062 R)
• M16: 2,479,585 km (0.101 R)
• M17: 2,611,829 km (0.087 R)
• M18: 2,855,823 km (0.104 R)
• M19: 3,126,595 km (0.088 R)
• M20: 3,804,573 km (0.075 R)
• M21: 4,271,468 km (0.098 R)
• M22: 4,409,846 km (0.053 R)
• M23: 4,658,328 km (0.048 R)
• M24: 4,789,825 km (0.101 R)
• M25: 5,203,164 km (0.12 R)
• M26: 5,397,192 km (0.055 R)
• M27: 5,523,901 km (0.073 R)
• M28: 5,639,989 km (0.076 R)
• M29: 6,232,846 km (0.079 R)
• M30: 6,438,992 km (0.102 R)
• M31: 6,536,829 km (0.104 R)
• M32: 7,121,756 km (0.115 R)
• M33: 7,710,424 km (0.087 R)
• M34: 8,102,969 km (0.075 R)
• M35: 8,222,049 km (0.104 R)
• M36: 8,596,193 km (0.049 R)
• M37: 8,744,594 km (0.113 R)
• M38: 8,894,042 km (0.09 R)
• M39: 9,112,904 km (0.061 R)
• M40: 9,278,210 km (0.067 R)
• M41: 9,444,413 km (0.091 R)

Planet 8 - Gas Giant

Semi-Major Axis: 1.87 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 720.8

Radius: 10.8

Gravity: 6.18 G

Time & Orbit

Eccentricity (e): 0.126

Orbit Range: 1.63 AU - 2.11 AU

Year: 1626 Days

Day: 10.7 Hours

Environment

Temp: -183 °C

Axial Tilt: 11.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (69)

Outer Limit: 24,305,445 km

• M1: 153,188 km (0.067 R)
• M2: 324,927 km (0.069 R)
• M3: 497,263 km (0.059 R)
• M4: 603,029 km (0.099 R)
• M5: 904,319 km (0.108 R)
• M6: 978,669 km (0.087 R)
• M7: 1,055,263 km (0.106 R)
• M8: 1,125,126 km (0.119 R)
• M9: 1,196,783 km (0.08 R)
• M10: 1,279,211 km (0.025 R)
• M11: 1,489,546 km (0.105 R)
• M12: 1,711,100 km (0.11 R)
• M13: 1,794,576 km (0.051 R)
• M14: 1,911,412 km (0.109 R)
• M15: 2,243,519 km (0.073 R)
• M16: 2,312,035 km (0.066 R)
• M17: 2,416,454 km (0.087 R)
• M18: 2,534,188 km (0.047 R)
• M19: 2,605,845 km (0.052 R)
• M20: 2,974,454 km (0.096 R)
• M21: 3,255,399 km (0.09 R)
• M22: 3,412,178 km (0.061 R)
• M23: 3,518,243 km (0.093 R)
• M24: 3,801,880 km (0.045 R)
• M25: 4,149,247 km (0.097 R)
• M26: 4,234,218 km (0.066 R)
• M27: 4,319,639 km (0.077 R)
• M28: 4,420,168 km (0.118 R)
• M29: 4,535,957 km (0.119 R)
• M30: 4,770,676 km (0.089 R)
• M31: 4,874,647 km (0.064 R)
• M32: 4,994,475 km (0.062 R)
• M33: 5,069,872 km (0.102 R)
• M34: 5,267,491 km (0.045 R)
• M35: 5,639,241 km (0.115 R)
• M36: 5,780,911 km (0.102 R)
• M37: 5,987,505 km (0.071 R)
• M38: 6,132,017 km (0.09 R)
• M39: 6,310,337 km (0.119 R)
• M40: 6,424,630 km (0.054 R)
• M41: 7,210,019 km (0.073 R)
• M42: 7,398,213 km (0.111 R)
• M43: 7,674,969 km (0.071 R)
• M44: 8,185,098 km (0.092 R)
• M45: 8,274,258 km (0.112 R)
• M46: 8,363,718 km (0.094 R)
• M47: 8,471,428 km (0.077 R)
• M48: 9,424,367 km (0.092 R)
• M49: 9,573,965 km (0.097 R)
• M50: 9,856,705 km (0.067 R)
• M51: 9,932,551 km (0.097 R)
• M52: 10,065,842 km (0.063 R)
• M53: 10,276,327 km (0.094 R)
• M54: 10,701,783 km (0.106 R)
• M55: 11,231,958 km (0.063 R)
• M56: 11,370,785 km (0.111 R)
• M57: 11,470,267 km (0.092 R)
• M58: 11,891,535 km (0.115 R)
• M59: 11,972,318 km (0.04 R)
• M60: 12,215,863 km (0.105 R)
• M61: 12,317,739 km (0.084 R)
• M62: 12,707,741 km (0.103 R)
• M63: 13,143,669 km (0.094 R)
• M64: 13,457,974 km (0.079 R)
• M65: 13,626,571 km (0.073 R)
• M66: 13,732,337 km (0.102 R)
• M67: 13,859,644 km (0.065 R)
• M68: 14,115,457 km (0.114 R)
• M69: 14,265,354 km (0.099 R)

Planet 9 - Gas Giant

Semi-Major Axis: 4.45 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 250.7

Radius: 9.6

Gravity: 2.72 G

Time & Orbit

Eccentricity (e): 0.226

Orbit Range: 3.44 AU - 5.46 AU

Year: 5969 Days

Day: 8.2 Hours

Environment

Temp: -211 °C

Axial Tilt: 9.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 24,305,445 km

• M1: 123,418 km (0.109 R)
• M2: 448,494 km (0.082 R)
• M3: 511,026 km (0.109 R)
• M4: 708,196 km (0.1 R)
• M5: 930,499 km (0.091 R)
• M6: 1,149,959 km (0.069 R)
• M7: 1,524,402 km (0.106 R)
• M8: 1,740,422 km (0.089 R)
• M9: 1,874,910 km (0.106 R)
• M10: 2,154,209 km (0.106 R)
• M11: 2,632,175 km (0.089 R)
• M12: 2,822,014 km (0.114 R)
• M13: 2,980,887 km (0.034 R)
• M14: 3,052,395 km (0.062 R)
• M15: 3,626,402 km (0.085 R)
• M16: 3,994,562 km (0.1 R)
• M17: 4,314,103 km (0.113 R)
• M18: 4,395,335 km (0.072 R)
• M19: 4,497,510 km (0.025 R)
• M20: 4,579,939 km (0.052 R)
• M21: 4,704,404 km (0.097 R)
• M22: 5,584,788 km (0.037 R)
• M23: 5,964,766 km (0.12 R)
• M24: 6,238,082 km (0.09 R)
• M25: 6,773,343 km (0.109 R)
• M26: 7,154,369 km (0.091 R)
• M27: 7,444,738 km (0.119 R)
• M28: 7,962,347 km (0.119 R)
• M29: 8,288,620 km (0.107 R)
• M30: 9,032,121 km (0.12 R)
• M31: 9,504,402 km (0.094 R)
• M32: 9,583,838 km (0.098 R)
• M33: 9,877,199 km (0.095 R)
• M34: 10,472,898 km (0.108 R)
• M35: 10,555,027 km (0.054 R)
• M36: 11,080,265 km (0.058 R)
• M37: 11,247,815 km (0.104 R)
• M38: 11,585,607 km (0.1 R)
• M39: 11,898,117 km (0.081 R)
• M40: 12,127,301 km (0.086 R)
• M41: 12,415,726 km (0.118 R)
• M42: 12,881,873 km (0.076 R)
• M43: 13,353,854 km (0.113 R)
• M44: 13,562,094 km (0.082 R)
• M45: 13,921,578 km (0.1 R)
• M46: 14,072,373 km (0.109 R)
• M47: 15,515,543 km (0.098 R)
• M48: 15,860,067 km (0.058 R)
• M49: 15,954,463 km (0.077 R)
• M50: 16,112,289 km (0.05 R)
• M51: 16,175,569 km (0.106 R)
• M52: 16,302,278 km (0.05 R)
• M53: 16,812,706 km (0.118 R)
• M54: 17,425,459 km (0.083 R)
• M55: 17,750,984 km (0.057 R)
• M56: 17,816,358 km (0.068 R)
• M57: 18,045,692 km (0.052 R)
• M58: 18,243,012 km (0.065 R)
• M59: 18,639,895 km (0.056 R)
• M60: 19,813,640 km (0.104 R)
• M61: 19,983,284 km (0.113 R)
• M62: 20,392,434 km (0.111 R)
• M63: 20,529,316 km (0.096 R)
• M64: 20,769,869 km (0.04 R)
• M65: 21,461,909 km (0.104 R)
• M66: 21,775,915 km (0.031 R)
• M67: 22,056,261 km (0.098 R)
• M68: 22,126,572 km (0.049 R)
• M69: 22,302,499 km (0.069 R)
• M70: 22,514,330 km (0.116 R)
• M71: 22,726,909 km (0.073 R)
• M72: 23,082,503 km (0.101 R)
• M73: 23,296,727 km (0.119 R)
• M74: 23,583,506 km (0.071 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: 351 - 19,823 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit