🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.53 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.72

Radius: 1.24

Gravity: 1.12 G

Time & Orbit

Eccentricity (e): 0.04

Orbit Range: 0.51 AU - 0.55 AU

Year: 245 Days

Day: 19.9 Hours

Environment

Temp: -122 °C

Axial Tilt: 4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 66,511,981 km

• M1: 317,895 km (0.053 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.78 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 407.7

Radius: 10.1

Gravity: 4 G

Time & Orbit

Eccentricity (e): 0.212

Orbit Range: 0.61 AU - 0.95 AU

Year: 438 Days

Day: 8.3 Hours

Environment

Temp: -149 °C

Axial Tilt: 16.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 66,511,981 km

• M1: 125,812 km (0.051 R)
• M2: 192,084 km (0.087 R)
• M3: 255,364 km (0.084 R)
• M4: 331,210 km (0.115 R)
• M5: 400,922 km (0.114 R)
• M6: 517,459 km (0.102 R)
• M7: 585,676 km (0.115 R)
• M8: 743,501 km (0.086 R)
• M9: 829,969 km (0.063 R)
• M10: 1,076,955 km (0.11 R)
• M11: 1,158,785 km (0.097 R)
• M12: 1,233,883 km (0.106 R)
• M13: 1,301,501 km (0.111 R)
• M14: 1,393,803 km (0.078 R)
• M15: 1,459,776 km (0.036 R)
• M16: 1,570,628 km (0.118 R)
• M17: 1,699,432 km (0.115 R)
• M18: 1,915,002 km (0.069 R)
• M19: 1,978,282 km (0.083 R)
• M20: 2,053,081 km (0.102 R)
• M21: 2,205,521 km (0.088 R)
• M22: 2,277,478 km (0.058 R)
• M23: 2,407,030 km (0.11 R)
• M24: 2,573,831 km (0.074 R)
• M25: 2,744,523 km (0.118 R)
• M26: 2,900,852 km (0.059 R)
• M27: 2,974,006 km (0.108 R)
• M28: 3,053,891 km (0.057 R)
• M29: 3,153,224 km (0.034 R)
• M30: 3,222,189 km (0.083 R)
• M31: 3,285,468 km (0.049 R)
• M32: 3,387,345 km (0.083 R)
• M33: 3,483,835 km (0.093 R)
• M34: 3,812,352 km (0.099 R)
• M35: 3,899,418 km (0.104 R)
• M36: 3,980,351 km (0.059 R)
• M37: 4,068,613 km (0.106 R)
• M38: 4,171,387 km (0.097 R)
• M39: 4,330,709 km (0.055 R)
• M40: 4,584,128 km (0.098 R)
• M41: 4,763,047 km (0.115 R)
• M42: 4,936,879 km (0.09 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.81 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 651.1

Radius: 14.9

Gravity: 2.93 G

Time & Orbit

Eccentricity (e): 0.002

Orbit Range: 0.81 AU - 0.81 AU

Year: 464 Days

Day: 7.6 Hours

Environment

Temp: -156 °C

Axial Tilt: 2.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (35)

Outer Limit: 66,511,981 km

• M1: 186,249 km (0.103 R)
• M2: 318,643 km (0.072 R)
• M3: 458,517 km (0.114 R)
• M4: 552,016 km (0.094 R)
• M5: 669,750 km (0.096 R)
• M6: 781,350 km (0.099 R)
• M7: 878,588 km (0.102 R)
• M8: 971,489 km (0.1 R)
• M9: 1,101,340 km (0.114 R)
• M10: 1,297,911 km (0.093 R)
• M11: 1,533,827 km (0.107 R)
• M12: 1,693,747 km (0.117 R)
• M13: 1,853,518 km (0.088 R)
• M14: 2,006,855 km (0.056 R)
• M15: 2,109,330 km (0.073 R)
• M16: 2,220,032 km (0.091 R)
• M17: 2,364,394 km (0.118 R)
• M18: 2,544,510 km (0.11 R)
• M19: 2,782,969 km (0.119 R)
• M20: 2,939,149 km (0.059 R)
• M21: 3,126,595 km (0.08 R)
• M22: 3,325,112 km (0.1 R)
• M23: 3,418,760 km (0.095 R)
• M24: 3,616,229 km (0.091 R)
• M25: 3,712,570 km (0.117 R)
• M26: 3,915,724 km (0.118 R)
• M27: 4,099,430 km (0.091 R)
• M28: 4,317,395 km (0.068 R)
• M29: 4,579,340 km (0.115 R)
• M30: 4,683,909 km (0.066 R)
• M31: 4,854,750 km (0.08 R)
• M32: 5,085,729 km (0.078 R)
• M33: 5,456,134 km (0.083 R)
• M34: 5,593,016 km (0.11 R)
• M35: 5,957,885 km (0.069 R)

Asteroid Belt

Center: 1.07 AU

Composition

Type: Far Outer (Icy/Cometary)

A dense region of planetesimals and debris.

Boundary

Planet 4 - Gas Giant

Semi-Major Axis: 1.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 366.9

Radius: 12.1

Gravity: 2.51 G

Time & Orbit

Eccentricity (e): 0.093

Orbit Range: 1.21 AU - 1.45 AU

Year: 975 Days

Day: 8.3 Hours

Environment

Temp: -169 °C

Axial Tilt: 34.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (50)

Outer Limit: 66,511,981 km

• M1: 155,283 km (0.071 R)
• M2: 238,309 km (0.08 R)
• M3: 333,753 km (0.109 R)
• M4: 433,834 km (0.111 R)
• M5: 534,364 km (0.114 R)
• M6: 616,194 km (0.107 R)
• M7: 728,093 km (0.081 R)
• M8: 805,285 km (0.11 R)
• M9: 902,075 km (0.105 R)
• M10: 1,003,203 km (0.059 R)
• M11: 1,114,355 km (0.11 R)
• M12: 1,211,593 km (0.081 R)
• M13: 1,350,121 km (0.078 R)
• M14: 1,428,061 km (0.073 R)
• M15: 1,534,575 km (0.082 R)
• M16: 1,855,911 km (0.1 R)
• M17: 2,047,247 km (0.117 R)
• M18: 2,160,642 km (0.056 R)
• M19: 2,276,132 km (0.112 R)
• M20: 2,449,516 km (0.078 R)
• M21: 2,602,853 km (0.082 R)
• M22: 2,684,983 km (0.1 R)
• M23: 2,851,635 km (0.093 R)
• M24: 2,944,834 km (0.044 R)
• M25: 3,082,165 km (0.104 R)
• M26: 3,213,063 km (0.066 R)
• M27: 3,390,337 km (0.057 R)
• M28: 3,534,549 km (0.065 R)
• M29: 3,736,356 km (0.1 R)
• M30: 3,932,479 km (0.078 R)
• M31: 4,551,366 km (0.11 R)
• M32: 4,660,871 km (0.119 R)
• M33: 4,761,102 km (0.067 R)
• M34: 5,138,537 km (0.105 R)
• M35: 5,378,193 km (0.114 R)
• M36: 5,504,603 km (0.12 R)
• M37: 5,632,061 km (0.09 R)
• M38: 5,760,565 km (0.059 R)
• M39: 5,846,734 km (0.086 R)
• M40: 5,944,271 km (0.1 R)
• M41: 6,097,011 km (0.068 R)
• M42: 6,306,448 km (0.114 R)
• M43: 6,406,529 km (0.12 R)
• M44: 6,630,776 km (0.074 R)
• M45: 6,846,197 km (0.106 R)
• M46: 7,063,862 km (0.119 R)
• M47: 7,307,258 km (0.104 R)
• M48: 7,447,580 km (0.073 R)
• M49: 7,897,870 km (0.072 R)
• M50: 8,126,456 km (0.098 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.53 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 743.9

Radius: 8.9

Gravity: 9.39 G

Time & Orbit

Eccentricity (e): 0.019

Orbit Range: 1.5 AU - 1.56 AU

Year: 1203 Days

Day: 5.2 Hours

Environment

Temp: -182 °C

Axial Tilt: 2.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (69)

Outer Limit: 66,511,981 km

• M1: 139,425 km (0.089 R)
• M2: 202,256 km (0.115 R)
• M3: 289,921 km (0.071 R)
• M4: 464,651 km (0.117 R)
• M5: 568,622 km (0.088 R)
• M6: 630,256 km (0.074 R)
• M7: 767,587 km (0.081 R)
• M8: 1,065,137 km (0.066 R)
• M9: 1,288,486 km (0.037 R)
• M10: 1,346,830 km (0.092 R)
• M11: 1,423,125 km (0.07 R)
• M12: 1,527,095 km (0.055 R)
• M13: 1,606,831 km (0.062 R)
• M14: 1,770,640 km (0.111 R)
• M15: 1,835,865 km (0.118 R)
• M16: 1,911,412 km (0.075 R)
• M17: 1,988,006 km (0.087 R)
• M18: 2,065,647 km (0.048 R)
• M19: 2,204,175 km (0.089 R)
• M20: 2,448,618 km (0.063 R)
• M21: 2,563,659 km (0.052 R)
• M22: 2,788,355 km (0.095 R)
• M23: 3,053,143 km (0.047 R)
• M24: 3,234,156 km (0.034 R)
• M25: 3,524,227 km (0.08 R)
• M26: 3,594,986 km (0.11 R)
• M27: 3,678,312 km (0.1 R)
• M28: 3,871,144 km (0.03 R)
• M29: 3,956,564 km (0.118 R)
• M30: 4,055,000 km (0.092 R)
• M31: 4,431,239 km (0.099 R)
• M32: 4,610,756 km (0.111 R)
• M33: 4,727,442 km (0.078 R)
• M34: 4,805,682 km (0.114 R)
• M35: 5,393,302 km (0.114 R)
• M36: 5,516,272 km (0.112 R)
• M37: 5,667,964 km (0.066 R)
• M38: 6,060,210 km (0.105 R)
• M39: 6,159,543 km (0.056 R)
• M40: 6,216,689 km (0.027 R)
• M41: 6,288,197 km (0.072 R)
• M42: 6,446,621 km (0.118 R)
• M43: 6,664,884 km (0.103 R)
• M44: 6,856,070 km (0.051 R)
• M45: 6,915,162 km (0.068 R)
• M46: 7,349,295 km (0.119 R)
• M47: 7,440,250 km (0.068 R)
• M48: 7,592,541 km (0.054 R)
• M49: 7,746,028 km (0.11 R)
• M50: 7,885,005 km (0.062 R)
• M51: 8,149,643 km (0.104 R)
• M52: 8,212,474 km (0.073 R)
• M53: 8,322,578 km (0.098 R)
• M54: 8,433,281 km (0.071 R)
• M55: 8,528,425 km (0.12 R)
• M56: 8,720,060 km (0.084 R)
• M57: 8,832,408 km (0.083 R)
• M58: 8,945,354 km (0.112 R)
• M59: 9,699,028 km (0.104 R)
• M60: 9,798,810 km (0.076 R)
• M61: 10,016,325 km (0.115 R)
• M62: 10,729,758 km (0.117 R)
• M63: 10,850,334 km (0.025 R)
• M64: 11,127,389 km (0.099 R)
• M65: 11,197,101 km (0.071 R)
• M66: 11,494,652 km (0.057 R)
• M67: 11,618,070 km (0.032 R)
• M68: 11,777,242 km (0.066 R)
• M69: 11,901,558 km (0.05 R)

Planet 6 - Gas Giant

Semi-Major Axis: 2.1 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 39.4

Radius: 11.1

Gravity: 0.32 G

Time & Orbit

Eccentricity (e): 0.082

Orbit Range: 1.93 AU - 2.27 AU

Year: 1935 Days

Day: 5.1 Hours

Environment

Temp: -186 °C

Axial Tilt: 25.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (32)

Outer Limit: 66,511,981 km

• M1: 231,428 km (0.113 R)
• M2: 309,668 km (0.056 R)
• M3: 458,517 km (0.084 R)
• M4: 532,568 km (0.026 R)
• M5: 775,366 km (0.043 R)
• M6: 889,958 km (0.104 R)
• M7: 1,025,045 km (0.074 R)
• M8: 1,348,475 km (0.078 R)
• M9: 1,467,106 km (0.109 R)
• M10: 1,572,423 km (0.109 R)
• M11: 2,050,837 km (0.119 R)
• M12: 2,290,493 km (0.08 R)
• M13: 2,426,926 km (0.11 R)
• M14: 2,546,156 km (0.1 R)
• M15: 2,811,243 km (0.101 R)
• M16: 3,164,145 km (0.068 R)
• M17: 3,287,563 km (0.105 R)
• M18: 3,471,867 km (0.086 R)
• M19: 3,599,175 km (0.061 R)
• M20: 3,682,352 km (0.041 R)
• M21: 3,843,020 km (0.083 R)
• M22: 4,037,347 km (0.072 R)
• M23: 4,179,316 km (0.094 R)
• M24: 4,443,954 km (0.099 R)
• M25: 4,549,720 km (0.097 R)
• M26: 4,705,900 km (0.108 R)
• M27: 4,780,550 km (0.025 R)
• M28: 4,889,008 km (0.078 R)
• M29: 5,159,481 km (0.056 R)
• M30: 5,270,782 km (0.111 R)
• M31: 5,812,625 km (0.107 R)
• M32: 5,892,660 km (0.119 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.19 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 814

Radius: 7.1

Gravity: 16.15 G

Time & Orbit

Eccentricity (e): 0.164

Orbit Range: 6.01 AU - 8.37 AU

Year: 12258 Days

Day: 19.3 Hours

Environment

Temp: -231 °C

Axial Tilt: 8.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (90)

Outer Limit: 66,511,981 km

• M1: 137,929 km (0.077 R)
• M2: 264,938 km (0.103 R)
• M3: 390,002 km (0.107 R)
• M4: 518,357 km (0.113 R)
• M5: 606,021 km (0.052 R)
• M6: 816,954 km (0.052 R)
• M7: 963,111 km (0.119 R)
• M8: 1,815,370 km (0.067 R)
• M9: 1,896,901 km (0.068 R)
• M10: 2,264,613 km (0.11 R)
• M11: 2,592,980 km (0.11 R)
• M12: 2,685,282 km (0.079 R)
• M13: 3,327,505 km (0.092 R)
• M14: 3,597,230 km (0.07 R)
• M15: 3,909,292 km (0.113 R)
• M16: 4,194,126 km (0.099 R)
• M17: 4,859,088 km (0.063 R)
• M18: 5,281,702 km (0.065 R)
• M19: 5,517,020 km (0.049 R)
• M20: 5,676,042 km (0.091 R)
• M21: 5,957,735 km (0.038 R)
• M22: 6,830,040 km (0.075 R)
• M23: 7,346,153 km (0.073 R)
• M24: 8,279,644 km (0.071 R)
• M25: 9,391,605 km (0.104 R)
• M26: 10,061,654 km (0.117 R)
• M27: 10,353,519 km (0.071 R)
• M28: 10,451,506 km (0.102 R)
• M29: 10,796,628 km (0.114 R)
• M30: 10,945,627 km (0.105 R)
• M31: 11,245,870 km (0.07 R)
• M32: 11,701,246 km (0.12 R)
• M33: 12,892,195 km (0.097 R)
• M34: 13,209,193 km (0.091 R)
• M35: 13,262,300 km (0.099 R)
• M36: 13,315,407 km (0.045 R)
• M37: 13,368,664 km (0.105 R)
• M38: 13,528,734 km (0.108 R)
• M39: 14,121,291 km (0.092 R)
• M40: 14,557,518 km (0.046 R)
• M41: 14,777,278 km (0.092 R)
• M42: 15,667,385 km (0.106 R)
• M43: 15,723,634 km (0.096 R)
• M44: 17,034,859 km (0.096 R)
• M45: 17,208,542 km (0.094 R)
• M46: 17,557,404 km (0.066 R)
• M47: 17,674,240 km (0.09 R)
• M48: 18,618,353 km (0.057 R)
• M49: 18,737,582 km (0.084 R)
• M50: 19,276,882 km (0.076 R)
• M51: 19,943,042 km (0.091 R)
• M52: 20,126,150 km (0.105 R)
• M53: 20,863,667 km (0.067 R)
• M54: 21,735,224 km (0.083 R)
• M55: 23,707,223 km (0.115 R)
• M56: 24,420,656 km (0.102 R)
• M57: 24,485,880 km (0.1 R)
• M58: 26,134,748 km (0.062 R)
• M59: 26,938,986 km (0.045 R)
• M60: 27,411,715 km (0.07 R)
• M61: 27,887,287 km (0.111 R)
• M62: 27,955,504 km (0.06 R)
• M63: 29,122,666 km (0.088 R)
• M64: 29,538,548 km (0.107 R)
• M65: 29,677,525 km (0.099 R)
• M66: 30,305,836 km (0.029 R)
• M67: 30,375,848 km (0.104 R)
• M68: 31,646,682 km (0.115 R)
• M69: 34,385,669 km (0.05 R)
• M70: 35,045,545 km (0.095 R)
• M71: 35,857,562 km (0.112 R)
• M72: 37,274,853 km (0.117 R)
• M73: 37,876,984 km (0.102 R)
• M74: 38,255,018 km (0.116 R)
• M75: 44,311,637 km (0.056 R)
• M76: 44,709,867 km (0.088 R)
• M77: 46,638,183 km (0.09 R)
• M78: 47,124,526 km (0.067 R)
• M79: 47,286,989 km (0.1 R)
• M80: 49,251,209 km (0.08 R)
• M81: 50,492,273 km (0.103 R)
• M82: 50,908,305 km (0.061 R)
• M83: 51,074,957 km (0.066 R)
• M84: 51,158,433 km (0.114 R)
• M85: 52,667,726 km (0.062 R)
• M86: 54,276,800 km (0.049 R)
• M87: 54,532,463 km (0.1 R)
• M88: 54,959,116 km (0.083 R)
• M89: 57,803,720 km (0.111 R)
• M90: 57,890,636 km (0.066 R)

Planet 8 - Ice Giant

Semi-Major Axis: 9.8 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 481

Radius: 3.8

Gravity: 33.31 G

Time & Orbit

Eccentricity (e): 0.208

Orbit Range: 7.76 AU - 11.84 AU

Year: 19506 Days

Day: 23 Hours

Environment

Temp: -229 °C

Axial Tilt: 26.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 66,511,981 km

• M1: 58,194 km (0.097 R)
• M2: 392,545 km (0.096 R)
• M3: 559,197 km (0.089 R)
• M4: 881,281 km (0.06 R)
• M5: 1,123,330 km (0.098 R)
• M6: 1,304,643 km (0.073 R)
• M7: 1,636,601 km (0.103 R)
• M8: 1,901,987 km (0.084 R)
• M9: 2,538,526 km (0.1 R)
• M10: 2,810,196 km (0.043 R)
• M11: 2,879,460 km (0.106 R)
• M12: 3,198,552 km (0.091 R)
• M13: 3,234,755 km (0.065 R)
• M14: 3,679,210 km (0.104 R)
• M15: 4,261,146 km (0.1 R)
• M16: 4,542,539 km (0.1 R)
• M17: 5,250,436 km (0.093 R)
• M18: 6,489,107 km (0.072 R)
• M19: 6,580,960 km (0.059 R)
• M20: 6,673,262 km (0.048 R)
• M21: 7,910,735 km (0.117 R)
• M22: 8,255,858 km (0.094 R)
• M23: 9,268,635 km (0.08 R)
• M24: 9,372,007 km (0.113 R)
• M25: 10,159,790 km (0.056 R)
• M26: 11,132,774 km (0.112 R)
• M27: 11,463,685 km (0.079 R)
• M28: 13,691,796 km (0.074 R)
• M29: 13,868,620 km (0.074 R)
• M30: 14,523,410 km (0.113 R)
• M31: 14,643,537 km (0.115 R)
• M32: 14,703,825 km (0.12 R)
• M33: 14,884,839 km (0.098 R)
• M34: 15,432,516 km (0.072 R)
• M35: 16,235,109 km (0.102 R)
• M36: 17,051,165 km (0.059 R)
• M37: 17,688,003 km (0.06 R)
• M38: 17,752,031 km (0.109 R)
• M39: 18,267,695 km (0.036 R)
• M40: 18,332,471 km (0.104 R)
• M41: 18,592,472 km (0.094 R)
• M42: 19,977,300 km (0.104 R)
• M43: 20,378,970 km (0.095 R)
• M44: 24,183,393 km (0.112 R)
• M45: 26,936,144 km (0.1 R)
• M46: 27,751,303 km (0.111 R)
• M47: 27,825,802 km (0.104 R)
• M48: 27,900,302 km (0.06 R)
• M49: 28,499,292 km (0.086 R)
• M50: 28,725,035 km (0.093 R)
• M51: 29,102,471 km (0.093 R)
• M52: 30,091,761 km (0.039 R)
• M53: 31,634,863 km (0.091 R)
• M54: 33,441,108 km (0.027 R)
• M55: 34,396,739 km (0.108 R)
• M56: 34,958,330 km (0.074 R)
• M57: 35,119,297 km (0.063 R)
• M58: 35,280,563 km (0.109 R)
• M59: 37,399,019 km (0.091 R)
• M60: 38,390,703 km (0.118 R)
• M61: 40,653,221 km (0.03 R)
• M62: 40,737,894 km (0.102 R)
• M63: 41,331,947 km (0.102 R)
• M64: 42,014,263 km (0.095 R)
• M65: 42,614,449 km (0.072 R)
• M66: 43,044,843 km (0.095 R)
• M67: 44,780,776 km (0.04 R)
• M68: 46,982,707 km (0.071 R)
• M69: 48,859,413 km (0.082 R)
• M70: 49,400,059 km (0.084 R)
• M71: 50,033,457 km (0.115 R)
• M72: 50,396,531 km (0.104 R)
• M73: 50,487,337 km (0.083 R)
• M74: 51,308,031 km (0.104 R)
• M75: 52,317,068 km (0.108 R)
• M76: 52,409,071 km (0.072 R)
• M77: 52,593,375 km (0.097 R)
• M78: 53,703,392 km (0.115 R)
• M79: 55,570,672 km (0.096 R)
• M80: 56,040,858 km (0.07 R)
• M81: 56,323,598 km (0.11 R)
• M82: 56,512,391 km (0.099 R)
• M83: 56,985,120 km (0.1 R)
• M84: 57,554,190 km (0.095 R)
• M85: 58,889,351 km (0.084 R)
• M86: 60,524,157 km (0.078 R)
• M87: 60,717,437 km (0.1 R)
• M88: 61,687,131 km (0.101 R)
• M89: 62,759,748 km (0.093 R)
• M90: 63,740,062 km (0.119 R)
• M91: 63,838,348 km (0.109 R)
• M92: 65,121,150 km (0.112 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: 448 - 15,376 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit