🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.55 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.22

Radius: 1.78

Gravity: 1.33 G

Time & Orbit

Eccentricity (e): 0.188

Orbit Range: 0.45 AU - 0.65 AU

Year: 150 Days

Day: 36.8 Hours

Environment

Temp: 157 °C

Axial Tilt: 15.5 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 0.89 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.43

Radius: 1.64

Gravity: 1.28 G

Time & Orbit

Eccentricity (e): 0.042

Orbit Range: 0.85 AU - 0.93 AU

Year: 308 Days

Day: 39.9 Hours

Environment

Temp: 78 °C

Axial Tilt: 18.9 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 2.35 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.69

Radius: 1.69

Gravity: 1.29 G

Time & Orbit

Eccentricity (e): 0.045

Orbit Range: 2.24 AU - 2.46 AU

Year: 1322 Days

Day: 22.1 Hours

Environment

Temp: -77 °C

Axial Tilt: 21.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (2)

Outer Limit: 86,848,869 km

• M1: 232,325 km (0.092 R)
• M2: 956,230 km (0.112 R)

Planet 4 - Terrestrial

Semi-Major Axis: 3.58 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.07

Radius: 1.75

Gravity: 1.33 G

Time & Orbit

Eccentricity (e): 0.057

Orbit Range: 3.38 AU - 3.78 AU

Year: 2487 Days

Day: 28.9 Hours

Environment

Temp: -119 °C

Axial Tilt: 25.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Terrestrial

Semi-Major Axis: 3.72 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.84

Radius: 1.71

Gravity: 1.31 G

Time & Orbit

Eccentricity (e): 0.007

Orbit Range: 3.69 AU - 3.75 AU

Year: 2634 Days

Day: 18.9 Hours

Environment

Temp: -124 °C

Axial Tilt: 84.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 86,848,869 km

• M1: 1,143,676 km (0.026 R)

Planet 6 - Gas Giant

Semi-Major Axis: 6.12 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 737.1

Radius: 15

Gravity: 3.28 G

Time & Orbit

Eccentricity (e): 0.071

Orbit Range: 5.69 AU - 6.55 AU

Year: 5558 Days

Day: 9.2 Hours

Environment

Temp: -147 °C

Axial Tilt: 46.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 86,848,869 km

• M1: 229,932 km (0.047 R)
• M2: 480,957 km (0.086 R)
• M3: 746,344 km (0.117 R)
• M4: 1,990,699 km (0.108 R)
• M5: 2,181,885 km (0.054 R)
• M6: 2,813,786 km (0.06 R)
• M7: 2,964,282 km (0.053 R)
• M8: 3,073,488 km (0.12 R)
• M9: 3,593,490 km (0.069 R)
• M10: 3,876,081 km (0.088 R)
• M11: 4,044,229 km (0.075 R)
• M12: 4,141,467 km (0.093 R)
• M13: 4,239,604 km (0.053 R)
• M14: 4,338,338 km (0.059 R)
• M15: 4,563,633 km (0.094 R)
• M16: 4,690,492 km (0.081 R)
• M17: 4,792,966 km (0.105 R)
• M18: 4,947,950 km (0.032 R)
• M19: 5,104,579 km (0.087 R)
• M20: 5,422,923 km (0.076 R)
• M21: 5,775,226 km (0.07 R)
• M22: 6,051,533 km (0.084 R)
• M23: 6,847,992 km (0.104 R)
• M24: 6,964,529 km (0.104 R)
• M25: 8,539,196 km (0.106 R)
• M26: 9,496,174 km (0.09 R)
• M27: 10,119,997 km (0.084 R)
• M28: 10,353,220 km (0.115 R)
• M29: 10,520,919 km (0.109 R)
• M30: 11,097,768 km (0.053 R)
• M31: 11,754,802 km (0.12 R)
• M32: 12,710,134 km (0.091 R)
• M33: 13,034,163 km (0.1 R)
• M34: 13,360,885 km (0.1 R)
• M35: 14,134,007 km (0.086 R)
• M36: 14,245,607 km (0.087 R)
• M37: 14,357,506 km (0.059 R)
• M38: 14,507,254 km (0.1 R)
• M39: 15,225,323 km (0.099 R)
• M40: 15,646,441 km (0.052 R)
• M41: 16,382,912 km (0.03 R)
• M42: 16,500,196 km (0.037 R)
• M43: 17,688,751 km (0.095 R)
• M44: 17,849,420 km (0.108 R)
• M45: 18,131,561 km (0.08 R)
• M46: 18,496,430 km (0.054 R)
• M47: 18,823,002 km (0.118 R)
• M48: 18,986,962 km (0.098 R)
• M49: 19,192,509 km (0.087 R)
• M50: 20,399,764 km (0.115 R)
• M51: 20,610,398 km (0.088 R)
• M52: 20,906,452 km (0.085 R)
• M53: 21,588,618 km (0.118 R)
• M54: 22,494,882 km (0.086 R)
• M55: 22,887,128 km (0.087 R)
• M56: 23,106,139 km (0.063 R)
• M57: 24,033,048 km (0.083 R)
• M58: 25,017,252 km (0.118 R)
• M59: 25,469,037 km (0.1 R)
• M60: 25,877,888 km (0.076 R)
• M61: 26,060,398 km (0.103 R)
• M62: 26,243,206 km (0.054 R)
• M63: 26,656,246 km (0.058 R)
• M64: 26,794,325 km (0.054 R)
• M65: 26,978,929 km (0.118 R)
• M66: 27,256,582 km (0.058 R)
• M67: 28,142,052 km (0.081 R)
• M68: 28,376,622 km (0.064 R)
• M69: 28,942,251 km (0.037 R)
• M70: 29,321,482 km (0.115 R)
• M71: 29,893,395 km (0.092 R)
• M72: 30,276,664 km (0.045 R)
• M73: 30,468,898 km (0.093 R)
• M74: 30,806,390 km (0.065 R)
• M75: 32,413,819 km (0.04 R)

Planet 7 - Gas Giant

Semi-Major Axis: 6.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 31.9

Radius: 10.8

Gravity: 0.27 G

Time & Orbit

Eccentricity (e): 0.129

Orbit Range: 5.72 AU - 7.42 AU

Year: 6182 Days

Day: 10 Hours

Environment

Temp: -155 °C

Axial Tilt: 37.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (47)

Outer Limit: 86,848,869 km

• M1: 144,811 km (0.106 R)
• M2: 211,980 km (0.118 R)
• M3: 383,569 km (0.078 R)
• M4: 463,005 km (0.087 R)
• M5: 789,727 km (0.116 R)
• M6: 919,279 km (0.104 R)
• M7: 986,748 km (0.116 R)
• M8: 1,167,761 km (0.103 R)
• M9: 1,283,400 km (0.081 R)
• M10: 1,351,318 km (0.058 R)
• M11: 1,499,868 km (0.066 R)
• M12: 2,168,571 km (0.086 R)
• M13: 2,686,778 km (0.117 R)
• M14: 2,763,970 km (0.087 R)
• M15: 3,011,555 km (0.064 R)
• M16: 3,207,678 km (0.085 R)
• M17: 3,348,898 km (0.048 R)
• M18: 3,996,806 km (0.053 R)
• M19: 4,537,603 km (0.044 R)
• M20: 4,656,683 km (0.073 R)
• M21: 4,789,974 km (0.083 R)
• M22: 5,060,597 km (0.104 R)
• M23: 5,687,861 km (0.072 R)
• M24: 5,873,661 km (0.103 R)
• M25: 6,222,075 km (0.119 R)
• M26: 6,697,048 km (0.093 R)
• M27: 6,999,984 km (0.117 R)
• M28: 7,137,763 km (0.09 R)
• M29: 7,556,488 km (0.049 R)
• M30: 7,713,565 km (0.081 R)
• M31: 7,871,840 km (0.108 R)
• M32: 8,239,851 km (0.078 R)
• M33: 8,353,096 km (0.1 R)
• M34: 8,466,641 km (0.1 R)
• M35: 8,777,805 km (0.095 R)
• M36: 9,026,137 km (0.057 R)
• M37: 9,126,069 km (0.102 R)
• M38: 9,243,204 km (0.08 R)
• M39: 9,750,789 km (0.081 R)
• M40: 9,887,671 km (0.119 R)
• M41: 9,990,744 km (0.113 R)
• M42: 10,757,583 km (0.12 R)
• M43: 10,970,012 km (0.099 R)
• M44: 11,041,220 km (0.117 R)
• M45: 11,345,203 km (0.077 R)
• M46: 11,561,522 km (0.064 R)
• M47: 12,403,309 km (0.085 R)

Planet 8 - Gas Giant

Semi-Major Axis: 6.91 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 773.9

Radius: 14.7

Gravity: 3.58 G

Time & Orbit

Eccentricity (e): 0.1

Orbit Range: 6.22 AU - 7.6 AU

Year: 6668 Days

Day: 7.2 Hours

Environment

Temp: -157 °C

Axial Tilt: 40 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 86,848,869 km

• M1: 192,383 km (0.11 R)
• M2: 399,875 km (0.109 R)
• M3: 796,758 km (0.103 R)
• M4: 930,798 km (0.069 R)
• M5: 1,310,777 km (0.102 R)
• M6: 1,491,491 km (0.097 R)
• M7: 1,919,341 km (0.101 R)
• M8: 2,233,347 km (0.096 R)
• M9: 2,385,787 km (0.087 R)
• M10: 2,632,474 km (0.074 R)
• M11: 3,078,724 km (0.072 R)
• M12: 3,498,496 km (0.1 R)
• M13: 3,625,504 km (0.08 R)
• M14: 3,754,159 km (0.075 R)
• M15: 4,176,025 km (0.082 R)
• M16: 4,284,034 km (0.111 R)
• M17: 4,894,394 km (0.088 R)
• M18: 5,008,387 km (0.111 R)
• M19: 5,268,239 km (0.115 R)
• M20: 5,443,867 km (0.105 R)
• M21: 5,651,359 km (0.1 R)
• M22: 6,476,092 km (0.102 R)
• M23: 6,633,020 km (0.096 R)
• M24: 6,854,874 km (0.099 R)
• M25: 7,208,523 km (0.091 R)
• M26: 7,502,483 km (0.059 R)
• M27: 7,766,972 km (0.028 R)
• M28: 8,135,880 km (0.099 R)
• M29: 8,373,591 km (0.108 R)
• M30: 9,312,019 km (0.076 R)
• M31: 9,560,950 km (0.104 R)
• M32: 9,884,081 km (0.109 R)
• M33: 10,210,803 km (0.09 R)
• M34: 10,726,317 km (0.108 R)
• M35: 11,401,602 km (0.084 R)
• M36: 11,782,627 km (0.041 R)
• M37: 12,872,149 km (0.105 R)
• M38: 13,269,182 km (0.109 R)
• M39: 13,549,378 km (0.117 R)
• M40: 13,710,495 km (0.068 R)
• M41: 14,197,436 km (0.037 R)
• M42: 15,104,897 km (0.102 R)
• M43: 15,523,621 km (0.091 R)
• M44: 16,116,328 km (0.08 R)
• M45: 16,458,459 km (0.098 R)
• M46: 16,802,833 km (0.113 R)
• M47: 17,674,390 km (0.117 R)
• M48: 17,938,879 km (0.097 R)
• M49: 19,325,502 km (0.092 R)
• M50: 19,552,442 km (0.096 R)
• M51: 20,607,555 km (0.078 R)
• M52: 20,932,332 km (0.028 R)
• M53: 21,305,579 km (0.113 R)
• M54: 21,446,201 km (0.11 R)
• M55: 21,775,316 km (0.086 R)
• M56: 22,868,727 km (0.094 R)
• M57: 23,349,684 km (0.11 R)
• M58: 23,882,702 km (0.075 R)
• M59: 24,321,622 km (0.091 R)
• M60: 24,615,881 km (0.117 R)
• M61: 24,960,554 km (0.082 R)
• M62: 25,555,206 km (0.049 R)
• M63: 27,112,968 km (0.084 R)
• M64: 28,546,266 km (0.099 R)
• M65: 29,637,433 km (0.093 R)
• M66: 30,109,264 km (0.095 R)
• M67: 30,319,898 km (0.082 R)
• M68: 30,636,447 km (0.099 R)
• M69: 30,848,278 km (0.053 R)
• M70: 31,166,772 km (0.032 R)
• M71: 31,433,056 km (0.071 R)
• M72: 32,075,130 km (0.094 R)
• M73: 34,246,693 km (0.105 R)
• M74: 34,466,452 km (0.109 R)
• M75: 34,962,668 km (0.063 R)
• M76: 35,906,331 km (0.119 R)
• M77: 36,802,273 km (0.112 R)
• M78: 37,365,808 km (0.098 R)
• M79: 37,478,904 km (0.092 R)
• M80: 37,875,638 km (0.09 R)

Planet 9 - Gas Giant

Semi-Major Axis: 10.37 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 855.7

Radius: 8.3

Gravity: 12.42 G

Time & Orbit

Eccentricity (e): 0.017

Orbit Range: 10.19 AU - 10.55 AU

Year: 12259 Days

Day: 5.5 Hours

Environment

Temp: -179 °C

Axial Tilt: 13 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (90)

Outer Limit: 86,848,869 km

• M1: 145,409 km (0.097 R)
• M2: 309,069 km (0.11 R)
• M3: 685,607 km (0.044 R)
• M4: 864,526 km (0.102 R)
• M5: 1,149,959 km (0.11 R)
• M6: 1,315,564 km (0.092 R)
• M7: 1,413,849 km (0.107 R)
• M8: 1,617,901 km (0.069 R)
• M9: 1,804,300 km (0.101 R)
• M10: 1,886,429 km (0.079 R)
• M11: 1,997,880 km (0.082 R)
• M12: 2,169,169 km (0.116 R)
• M13: 2,901,899 km (0.088 R)
• M14: 3,031,002 km (0.105 R)
• M15: 3,261,682 km (0.067 R)
• M16: 3,429,980 km (0.076 R)
• M17: 3,845,563 km (0.096 R)
• M18: 4,799,997 km (0.075 R)
• M19: 5,462,117 km (0.092 R)
• M20: 6,069,934 km (0.099 R)
• M21: 6,571,685 km (0.107 R)
• M22: 7,659,261 km (0.104 R)
• M23: 8,942,512 km (0.047 R)
• M24: 9,273,722 km (0.066 R)
• M25: 9,850,721 km (0.118 R)
• M26: 10,588,388 km (0.11 R)
• M27: 11,445,733 km (0.049 R)
• M28: 11,908,738 km (0.091 R)
• M29: 12,377,728 km (0.085 R)
• M30: 12,588,212 km (0.069 R)
• M31: 12,799,743 km (0.042 R)
• M32: 13,226,546 km (0.107 R)
• M33: 13,441,668 km (0.107 R)
• M34: 13,766,594 km (0.111 R)
• M35: 13,821,048 km (0.072 R)
• M36: 13,929,955 km (0.08 R)
• M37: 15,316,728 km (0.092 R)
• M38: 15,429,524 km (0.093 R)
• M39: 16,284,476 km (0.098 R)
• M40: 16,457,411 km (0.053 R)
• M41: 17,038,001 km (0.032 R)
• M42: 17,154,986 km (0.082 R)
• M43: 17,980,916 km (0.085 R)
• M44: 18,219,225 km (0.032 R)
• M45: 18,638,848 km (0.107 R)
• M46: 18,940,586 km (0.093 R)
• M47: 19,243,971 km (0.112 R)
• M48: 20,784,679 km (0.108 R)
• M49: 21,601,334 km (0.035 R)
• M50: 22,428,610 km (0.069 R)
• M51: 22,749,498 km (0.102 R)
• M52: 23,007,255 km (0.075 R)
• M53: 23,201,283 km (0.086 R)
• M54: 24,311,000 km (0.062 R)
• M55: 24,574,592 km (0.079 R)
• M56: 26,041,249 km (0.111 R)
• M57: 28,710,225 km (0.076 R)
• M58: 30,466,504 km (0.118 R)
• M59: 31,321,755 km (0.09 R)
• M60: 31,393,412 km (0.106 R)
• M61: 33,347,909 km (0.118 R)
• M62: 33,494,215 km (0.102 R)
• M63: 34,081,686 km (0.092 R)
• M64: 35,714,996 km (0.061 R)
• M65: 36,164,687 km (0.112 R)
• M66: 36,239,935 km (0.076 R)
• M67: 36,541,075 km (0.115 R)
• M68: 38,059,194 km (0.11 R)
• M69: 38,979,969 km (0.114 R)
• M70: 39,520,466 km (0.082 R)
• M71: 41,235,157 km (0.084 R)
• M72: 42,339,040 km (0.106 R)
• M73: 42,418,177 km (0.119 R)
• M74: 42,974,083 km (0.081 R)
• M75: 43,133,404 km (0.077 R)
• M76: 44,898,360 km (0.026 R)
• M77: 45,302,723 km (0.096 R)
• M78: 45,383,805 km (0.067 R)
• M79: 45,627,051 km (0.113 R)
• M80: 46,686,803 km (0.031 R)
• M81: 47,507,347 km (0.113 R)
• M82: 48,415,556 km (0.068 R)
• M83: 49,663,202 km (0.118 R)
• M84: 50,249,027 km (0.101 R)
• M85: 52,189,910 km (0.037 R)
• M86: 52,870,879 km (0.092 R)
• M87: 54,930,992 km (0.051 R)
• M88: 56,406,176 km (0.073 R)
• M89: 57,630,785 km (0.085 R)
• M90: 58,952,482 km (0.1 R)

Planet 10 - Ice Giant

Semi-Major Axis: 14.66 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 959.7

Radius: 3.1

Gravity: 99.86 G

Time & Orbit

Eccentricity (e): 0.142

Orbit Range: 12.58 AU - 16.74 AU

Year: 20605 Days

Day: 24.5 Hours

Environment

Temp: -181 °C

Axial Tilt: 31.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 86,848,869 km

• M1: 69,264 km (0.114 R)
• M2: 89,460 km (0.077 R)
• M3: 112,647 km (0.108 R)
• M4: 423,661 km (0.088 R)
• M5: 467,194 km (0.101 R)
• M6: 512,373 km (0.065 R)
• M7: 1,189,004 km (0.054 R)
• M8: 1,219,971 km (0.055 R)
• M9: 1,510,490 km (0.09 R)
• M10: 1,611,917 km (0.113 R)
• M11: 1,893,460 km (0.12 R)
• M12: 2,500,528 km (0.086 R)
• M13: 2,661,197 km (0.082 R)
• M14: 5,387,319 km (0.12 R)
• M15: 5,962,971 km (0.086 R)
• M16: 6,123,340 km (0.077 R)
• M17: 6,231,051 km (0.115 R)
• M18: 6,834,528 km (0.114 R)
• M19: 8,155,178 km (0.099 R)
• M20: 9,614,057 km (0.111 R)
• M21: 11,747,173 km (0.086 R)
• M22: 12,015,252 km (0.077 R)
• M23: 12,421,261 km (0.09 R)
• M24: 12,625,911 km (0.047 R)
• M25: 12,762,942 km (0.087 R)
• M26: 12,831,757 km (0.115 R)
• M27: 13,177,179 km (0.099 R)
• M28: 13,316,155 km (0.099 R)
• M29: 16,271,312 km (0.1 R)
• M30: 17,400,925 km (0.086 R)
• M31: 19,814,388 km (0.12 R)
• M32: 20,133,330 km (0.118 R)
• M33: 20,776,302 km (0.103 R)
• M34: 22,164,869 km (0.07 R)
• M35: 22,247,597 km (0.09 R)
• M36: 23,414,760 km (0.065 R)
• M37: 24,260,735 km (0.077 R)
• M38: 25,461,707 km (0.114 R)
• M39: 26,156,589 km (0.05 R)
• M40: 27,299,068 km (0.064 R)
• M41: 27,653,914 km (0.047 R)
• M42: 27,831,786 km (0.117 R)
• M43: 28,997,902 km (0.059 R)
• M44: 29,814,556 km (0.059 R)
• M45: 29,996,916 km (0.109 R)
• M46: 32,028,755 km (0.072 R)
• M47: 32,402,899 km (0.087 R)
• M48: 34,295,162 km (0.1 R)
• M49: 35,254,683 km (0.06 R)
• M50: 35,834,674 km (0.087 R)
• M51: 36,125,791 km (0.096 R)
• M52: 36,612,882 km (0.064 R)
• M53: 36,710,569 km (0.036 R)
• M54: 37,396,625 km (0.09 R)
• M55: 39,080,200 km (0.108 R)
• M56: 39,580,156 km (0.116 R)
• M57: 39,680,386 km (0.068 R)
• M58: 40,687,330 km (0.118 R)
• M59: 40,889,736 km (0.092 R)
• M60: 41,600,774 km (0.075 R)
• M61: 42,008,877 km (0.103 R)
• M62: 42,520,951 km (0.105 R)
• M63: 43,654,603 km (0.081 R)
• M64: 44,277,230 km (0.094 R)
• M65: 46,585,076 km (0.104 R)
• M66: 47,753,585 km (0.068 R)
• M67: 49,470,370 km (0.12 R)
• M68: 50,662,366 km (0.081 R)
• M69: 52,193,052 km (0.063 R)
• M70: 53,627,845 km (0.035 R)
• M71: 53,849,848 km (0.037 R)
• M72: 55,299,601 km (0.086 R)
• M73: 56,649,123 km (0.113 R)
• M74: 56,988,262 km (0.045 R)
• M75: 57,214,753 km (0.118 R)
• M76: 57,441,543 km (0.118 R)
• M77: 57,668,483 km (0.071 R)
• M78: 59,037,004 km (0.085 R)
• M79: 64,263,206 km (0.103 R)
• M80: 65,089,286 km (0.116 R)
• M81: 69,151,765 km (0.116 R)
• M82: 73,541,715 km (0.073 R)
• M83: 74,282,075 km (0.091 R)
• M84: 74,653,227 km (0.104 R)
• M85: 74,777,094 km (0.084 R)
• M86: 75,148,994 km (0.105 R)
• M87: 75,770,274 km (0.118 R)
• M88: 77,268,198 km (0.079 R)
• M89: 79,406,999 km (0.114 R)
• M90: 79,533,409 km (0.102 R)
• M91: 80,166,507 km (0.116 R)
• M92: 80,928,409 km (0.05 R)
• M93: 82,459,394 km (0.071 R)
• M94: 83,100,121 km (0.076 R)

Kuiper Belt

Range: 30 - 58 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 171 - 18,940 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit