🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.26 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.52 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 650.8

Radius: 14.3

Gravity: 3.18 G

Time & Orbit

Eccentricity (e): 0.092

Orbit Range: 0.47 AU - 0.57 AU

Year: 259 Days

Day: 5.7 Hours

Environment

Temp: -141 °C

Axial Tilt: 4.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (30)

Outer Limit: 41,000,879 km

• M1: 178,171 km (0.104 R)
• M2: 289,771 km (0.1 R)
• M3: 393,442 km (0.095 R)
• M4: 528,080 km (0.088 R)
• M5: 618,737 km (0.111 R)
• M6: 759,209 km (0.039 R)
• M7: 855,550 km (0.082 R)
• M8: 984,354 km (0.115 R)
• M9: 1,172,249 km (0.095 R)
• M10: 1,270,984 km (0.12 R)
• M11: 1,412,802 km (0.117 R)
• M12: 1,506,301 km (0.103 R)
• M13: 1,652,907 km (0.096 R)
• M14: 1,756,429 km (0.085 R)
• M15: 1,965,866 km (0.083 R)
• M16: 2,075,970 km (0.039 R)
• M17: 2,212,104 km (0.067 R)
• M18: 2,326,995 km (0.107 R)
• M19: 2,443,980 km (0.099 R)
• M20: 2,593,279 km (0.095 R)
• M21: 2,725,075 km (0.104 R)
• M22: 2,906,088 km (0.108 R)
• M23: 3,016,791 km (0.11 R)
• M24: 3,182,695 km (0.108 R)
• M25: 3,451,372 km (0.119 R)
• M26: 3,591,396 km (0.091 R)
• M27: 3,682,052 km (0.04 R)
• M28: 3,842,571 km (0.072 R)
• M29: 3,981,996 km (0.101 R)
• M30: 4,075,944 km (0.091 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 343.9

Radius: 9.8

Gravity: 3.58 G

Time & Orbit

Eccentricity (e): 0.172

Orbit Range: 0.47 AU - 0.67 AU

Year: 297 Days

Day: 10.8 Hours

Environment

Temp: -142 °C

Axial Tilt: 1.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (40)

Outer Limit: 41,000,879 km

• M1: 134,937 km (0.067 R)
• M2: 214,075 km (0.058 R)
• M3: 302,936 km (0.108 R)
• M4: 371,601 km (0.039 R)
• M5: 444,904 km (0.114 R)
• M6: 519,105 km (0.073 R)
• M7: 614,698 km (0.087 R)
• M8: 690,693 km (0.082 R)
• M9: 761,304 km (0.091 R)
• M10: 828,323 km (0.115 R)
• M11: 972,237 km (0.067 R)
• M12: 1,045,689 km (0.036 R)
• M13: 1,209,499 km (0.1 R)
• M14: 1,274,574 km (0.102 R)
• M15: 1,344,586 km (0.084 R)
• M16: 1,408,314 km (0.081 R)
• M17: 1,492,388 km (0.09 R)
• M18: 1,574,368 km (0.073 R)
• M19: 1,682,078 km (0.082 R)
• M20: 1,788,143 km (0.039 R)
• M21: 1,879,697 km (0.078 R)
• M22: 1,955,843 km (0.076 R)
• M23: 2,076,269 km (0.095 R)
• M24: 2,146,281 km (0.115 R)
• M25: 2,257,282 km (0.084 R)
• M26: 2,324,901 km (0.094 R)
• M27: 2,406,880 km (0.066 R)
• M28: 2,550,344 km (0.059 R)
• M29: 2,635,017 km (0.036 R)
• M30: 2,696,801 km (0.113 R)
• M31: 2,807,204 km (0.098 R)
• M32: 2,889,782 km (0.031 R)
• M33: 2,968,321 km (0.058 R)
• M34: 3,037,585 km (0.079 R)
• M35: 3,182,994 km (0.12 R)
• M36: 3,258,990 km (0.079 R)
• M37: 3,330,647 km (0.071 R)
• M38: 3,402,753 km (0.117 R)
• M39: 3,511,810 km (0.094 R)
• M40: 3,627,449 km (0.119 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.11 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 53

Radius: 8.4

Gravity: 0.75 G

Time & Orbit

Eccentricity (e): 0.081

Orbit Range: 1.02 AU - 1.2 AU

Year: 807 Days

Day: 7.8 Hours

Environment

Temp: -181 °C

Axial Tilt: 31.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (37)

Outer Limit: 41,000,879 km

• M1: 107,112 km (0.108 R)
• M2: 163,211 km (0.114 R)
• M3: 238,010 km (0.107 R)
• M4: 414,237 km (0.11 R)
• M5: 482,154 km (0.083 R)
• M6: 625,020 km (0.115 R)
• M7: 723,306 km (0.064 R)
• M8: 823,985 km (0.099 R)
• M9: 926,011 km (0.097 R)
• M10: 980,464 km (0.075 R)
• M11: 1,036,115 km (0.081 R)
• M12: 1,224,608 km (0.108 R)
• M13: 1,396,646 km (0.115 R)
• M14: 1,451,847 km (0.114 R)
• M15: 1,544,299 km (0.092 R)
• M16: 1,605,634 km (0.108 R)
• M17: 1,659,340 km (0.116 R)
• M18: 1,747,752 km (0.085 R)
• M19: 1,807,441 km (0.076 R)
• M20: 1,872,217 km (0.047 R)
• M21: 1,990,848 km (0.088 R)
• M22: 2,053,380 km (0.116 R)
• M23: 2,130,274 km (0.09 R)
• M24: 2,208,065 km (0.098 R)
• M25: 2,395,062 km (0.081 R)
• M26: 2,471,207 km (0.03 R)
• M27: 2,524,165 km (0.103 R)
• M28: 2,650,725 km (0.094 R)
• M29: 2,749,609 km (0.107 R)
• M30: 2,834,580 km (0.084 R)
• M31: 3,048,206 km (0.041 R)
• M32: 3,115,525 km (0.062 R)
• M33: 3,400,060 km (0.074 R)
• M34: 3,453,766 km (0.078 R)
• M35: 3,572,846 km (0.075 R)
• M36: 3,693,272 km (0.108 R)
• M37: 3,770,614 km (0.117 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.16 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 175.8

Radius: 13.6

Gravity: 0.95 G

Time & Orbit

Eccentricity (e): 0.196

Orbit Range: 0.93 AU - 1.39 AU

Year: 862 Days

Day: 6 Hours

Environment

Temp: -189 °C

Axial Tilt: 20.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (34)

Outer Limit: 41,000,879 km

• M1: 179,817 km (0.095 R)
• M2: 285,433 km (0.117 R)
• M3: 403,316 km (0.109 R)
• M4: 494,720 km (0.034 R)
• M5: 595,699 km (0.114 R)
• M6: 697,425 km (0.067 R)
• M7: 899,831 km (0.114 R)
• M8: 1,254,229 km (0.079 R)
• M9: 1,485,058 km (0.046 R)
• M10: 1,576,014 km (0.11 R)
• M11: 1,889,720 km (0.071 R)
• M12: 2,090,181 km (0.117 R)
• M13: 2,260,723 km (0.081 R)
• M14: 2,551,092 km (0.093 R)
• M15: 2,648,481 km (0.094 R)
• M16: 2,800,323 km (0.098 R)
• M17: 2,955,156 km (0.09 R)
• M18: 3,231,314 km (0.109 R)
• M19: 3,330,049 km (0.078 R)
• M20: 3,603,214 km (0.086 R)
• M21: 3,691,028 km (0.117 R)
• M22: 3,809,211 km (0.068 R)
• M23: 3,936,219 km (0.074 R)
• M24: 4,057,094 km (0.064 R)
• M25: 4,194,575 km (0.104 R)
• M26: 4,310,363 km (0.057 R)
• M27: 4,608,512 km (0.108 R)
• M28: 4,913,392 km (0.081 R)
• M29: 5,150,655 km (0.07 R)
• M30: 5,324,936 km (0.077 R)
• M31: 5,442,221 km (0.068 R)
• M32: 5,679,184 km (0.097 R)
• M33: 5,781,958 km (0.05 R)
• M34: 5,885,180 km (0.081 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.25 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 330.4

Radius: 10.9

Gravity: 2.78 G

Time & Orbit

Eccentricity (e): 0.214

Orbit Range: 0.98 AU - 1.52 AU

Year: 965 Days

Day: 9 Hours

Environment

Temp: -193 °C

Axial Tilt: 8.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (50)

Outer Limit: 41,000,879 km

• M1: 135,835 km (0.055 R)
• M2: 204,799 km (0.092 R)
• M3: 308,172 km (0.092 R)
• M4: 407,505 km (0.114 R)
• M5: 479,012 km (0.076 R)
• M6: 555,756 km (0.12 R)
• M7: 623,674 km (0.06 R)
• M8: 699,669 km (0.118 R)
• M9: 856,897 km (0.098 R)
• M10: 959,371 km (0.1 R)
• M11: 1,032,225 km (0.107 R)
• M12: 1,153,998 km (0.091 R)
• M13: 1,225,805 km (0.08 R)
• M14: 1,361,789 km (0.078 R)
• M15: 1,696,589 km (0.105 R)
• M16: 1,765,404 km (0.117 R)
• M17: 2,028,248 km (0.1 R)
• M18: 2,108,881 km (0.082 R)
• M19: 2,183,231 km (0.055 R)
• M20: 2,311,586 km (0.103 R)
• M21: 2,434,705 km (0.112 R)
• M22: 2,583,854 km (0.103 R)
• M23: 2,736,145 km (0.108 R)
• M24: 2,833,832 km (0.112 R)
• M25: 2,982,682 km (0.069 R)
• M26: 3,185,088 km (0.081 R)
• M27: 3,270,808 km (0.074 R)
• M28: 3,801,581 km (0.104 R)
• M29: 3,892,686 km (0.099 R)
• M30: 4,236,313 km (0.106 R)
• M31: 4,493,172 km (0.028 R)
• M32: 4,589,663 km (0.119 R)
• M33: 4,735,670 km (0.057 R)
• M34: 4,873,450 km (0.101 R)
• M35: 5,082,438 km (0.091 R)
• M36: 5,183,117 km (0.034 R)
• M37: 5,365,926 km (0.057 R)
• M38: 5,550,829 km (0.084 R)
• M39: 5,664,972 km (0.062 R)
• M40: 5,927,217 km (0.112 R)
• M41: 6,118,403 km (0.093 R)
• M42: 6,214,894 km (0.101 R)
• M43: 6,290,142 km (0.112 R)
• M44: 6,507,059 km (0.114 R)
• M45: 6,627,485 km (0.075 R)
• M46: 6,759,729 km (0.075 R)
• M47: 6,881,652 km (0.117 R)
• M48: 7,388,190 km (0.06 R)
• M49: 7,605,705 km (0.043 R)
• M50: 7,906,846 km (0.054 R)

Planet 6 - Gas Giant

Semi-Major Axis: 2.91 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 294.2

Radius: 10

Gravity: 2.94 G

Time & Orbit

Eccentricity (e): 0.034

Orbit Range: 2.81 AU - 3.01 AU

Year: 3426 Days

Day: 11.7 Hours

Environment

Temp: -210 °C

Axial Tilt: 13.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 41,000,879 km

• M1: 124,914 km (0.069 R)
• M2: 215,720 km (0.099 R)
• M3: 344,973 km (0.119 R)
• M4: 443,109 km (0.097 R)
• M5: 529,726 km (0.118 R)
• M6: 688,749 km (0.116 R)
• M7: 948,600 km (0.086 R)
• M8: 1,367,773 km (0.066 R)
• M9: 1,467,256 km (0.077 R)
• M10: 1,780,364 km (0.084 R)
• M11: 2,001,021 km (0.114 R)
• M12: 2,127,581 km (0.116 R)
• M13: 2,362,150 km (0.081 R)
• M14: 2,591,334 km (0.115 R)
• M15: 2,660,149 km (0.117 R)
• M16: 2,842,060 km (0.074 R)
• M17: 3,218,299 km (0.117 R)
• M18: 3,503,433 km (0.077 R)
• M19: 3,734,262 km (0.114 R)
• M20: 3,843,768 km (0.088 R)
• M21: 4,243,493 km (0.103 R)
• M22: 4,572,908 km (0.11 R)
• M23: 4,979,216 km (0.062 R)
• M24: 5,485,604 km (0.047 R)
• M25: 5,556,813 km (0.104 R)
• M26: 5,790,335 km (0.11 R)
• M27: 6,045,250 km (0.058 R)
• M28: 6,174,203 km (0.069 R)
• M29: 7,063,413 km (0.079 R)
• M30: 7,179,800 km (0.102 R)
• M31: 7,375,175 km (0.034 R)
• M32: 7,453,864 km (0.048 R)
• M33: 7,572,345 km (0.055 R)
• M34: 8,113,590 km (0.035 R)
• M35: 8,235,512 km (0.09 R)
• M36: 8,688,046 km (0.097 R)
• M37: 8,959,267 km (0.036 R)
• M38: 9,043,191 km (0.09 R)
• M39: 9,148,658 km (0.118 R)
• M40: 9,275,666 km (0.026 R)
• M41: 9,360,638 km (0.07 R)
• M42: 9,509,937 km (0.074 R)
• M43: 9,767,843 km (0.062 R)
• M44: 10,246,706 km (0.041 R)
• M45: 10,644,188 km (0.09 R)
• M46: 10,889,678 km (0.071 R)
• M47: 11,001,876 km (0.084 R)
• M48: 11,272,648 km (0.108 R)
• M49: 11,637,218 km (0.081 R)
• M50: 11,751,810 km (0.072 R)
• M51: 11,959,303 km (0.065 R)
• M52: 12,098,279 km (0.094 R)
• M53: 12,214,517 km (0.103 R)
• M54: 12,659,421 km (0.107 R)
• M55: 12,801,090 km (0.062 R)
• M56: 13,493,130 km (0.068 R)
• M57: 13,613,705 km (0.103 R)
• M58: 13,855,904 km (0.115 R)
• M59: 14,148,368 km (0.051 R)
• M60: 14,615,712 km (0.085 R)
• M61: 14,764,263 km (0.113 R)
• M62: 15,213,206 km (0.032 R)
• M63: 15,514,945 km (0.112 R)
• M64: 15,869,492 km (0.109 R)
• M65: 16,175,569 km (0.082 R)
• M66: 16,252,462 km (0.112 R)
• M67: 16,457,860 km (0.085 R)
• M68: 16,793,558 km (0.092 R)
• M69: 16,871,349 km (0.056 R)
• M70: 17,262,098 km (0.098 R)
• M71: 17,392,996 km (0.096 R)
• M72: 17,471,835 km (0.109 R)

Asteroid Belt

Center: 4.28 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 7 - Ice Giant

Semi-Major Axis: 5.65 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 513

Radius: 4

Gravity: 32.06 G

Time & Orbit

Eccentricity (e): 0.085

Orbit Range: 5.17 AU - 6.13 AU

Year: 9270 Days

Day: 15.6 Hours

Environment

Temp: -236 °C

Axial Tilt: 32.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 41,000,879 km

• M1: 193,879 km (0.108 R)
• M2: 355,893 km (0.089 R)
• M3: 568,472 km (0.087 R)
• M4: 831,764 km (0.099 R)
• M5: 985,102 km (0.073 R)
• M6: 1,092,214 km (0.076 R)
• M7: 1,165,816 km (0.118 R)
• M8: 1,279,211 km (0.081 R)
• M9: 1,557,763 km (0.062 R)
• M10: 1,682,826 km (0.113 R)
• M11: 1,854,565 km (0.11 R)
• M12: 2,100,055 km (0.071 R)
• M13: 2,475,097 km (0.114 R)
• M14: 3,180,002 km (0.086 R)
• M15: 3,285,618 km (0.075 R)
• M16: 3,691,477 km (0.082 R)
• M17: 4,055,897 km (0.061 R)
• M18: 4,141,617 km (0.069 R)
• M19: 4,285,979 km (0.071 R)
• M20: 4,461,158 km (0.098 R)
• M21: 4,579,340 km (0.101 R)
• M22: 4,638,880 km (0.067 R)
• M23: 4,818,847 km (0.09 R)
• M24: 5,062,242 km (0.105 R)
• M25: 5,185,511 km (0.106 R)
• M26: 5,561,301 km (0.098 R)
• M27: 5,978,081 km (0.062 R)
• M28: 6,371,822 km (0.09 R)
• M29: 6,807,750 km (0.107 R)
• M30: 6,943,735 km (0.095 R)
• M31: 7,427,085 km (0.065 R)
• M32: 8,608,460 km (0.064 R)
• M33: 8,829,566 km (0.086 R)
• M34: 9,428,107 km (0.096 R)
• M35: 9,847,130 km (0.092 R)
• M36: 9,962,470 km (0.055 R)
• M37: 10,506,558 km (0.091 R)
• M38: 11,582,914 km (0.096 R)
• M39: 11,867,749 km (0.086 R)
• M40: 11,949,579 km (0.11 R)
• M41: 12,693,978 km (0.103 R)
• M42: 12,903,415 km (0.07 R)
• M43: 13,924,719 km (0.09 R)
• M44: 14,270,739 km (0.057 R)
• M45: 14,927,474 km (0.101 R)
• M46: 15,281,572 km (0.119 R)
• M47: 17,790,777 km (0.041 R)
• M48: 17,837,452 km (0.115 R)
• M49: 18,213,242 km (0.101 R)
• M50: 19,116,214 km (0.12 R)
• M51: 19,212,107 km (0.066 R)
• M52: 19,356,319 km (0.101 R)
• M53: 20,326,311 km (0.093 R)
• M54: 21,411,494 km (0.112 R)
• M55: 21,911,002 km (0.088 R)
• M56: 22,162,177 km (0.089 R)
• M57: 22,768,946 km (0.083 R)
• M58: 23,125,437 km (0.086 R)
• M59: 23,535,036 km (0.075 R)
• M60: 23,843,806 km (0.116 R)
• M61: 24,621,566 km (0.113 R)
• M62: 24,778,195 km (0.08 R)
• M63: 24,830,404 km (0.117 R)
• M64: 24,882,763 km (0.049 R)
• M65: 25,039,841 km (0.039 R)
• M66: 25,460,510 km (0.04 R)
• M67: 25,565,977 km (0.115 R)
• M68: 26,042,596 km (0.096 R)
• M69: 26,148,810 km (0.088 R)
• M70: 26,522,057 km (0.103 R)
• M71: 27,058,365 km (0.053 R)
• M72: 28,087,000 km (0.063 R)
• M73: 28,196,057 km (0.112 R)
• M74: 28,523,976 km (0.082 R)
• M75: 28,578,728 km (0.101 R)
• M76: 28,688,384 km (0.071 R)
• M77: 28,908,143 km (0.105 R)
• M78: 29,128,351 km (0.054 R)
• M79: 29,349,157 km (0.118 R)
• M80: 31,023,307 km (0.093 R)
• M81: 31,192,353 km (0.086 R)
• M82: 31,531,491 km (0.101 R)
• M83: 31,701,434 km (0.111 R)
• M84: 31,871,826 km (0.1 R)
• M85: 32,441,794 km (0.095 R)
• M86: 32,498,941 km (0.1 R)
• M87: 32,957,608 km (0.092 R)
• M88: 33,765,287 km (0.082 R)
• M89: 36,286,759 km (0.088 R)
• M90: 40,150,124 km (0.12 R)
• M91: 40,457,398 km (0.058 R)
• M92: 40,765,420 km (0.113 R)
• M93: 40,950,622 km (0.073 R)

Planet 8 - Ice Giant

Semi-Major Axis: 7.24 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 237.1

Radius: 7

Gravity: 4.84 G

Time & Orbit

Eccentricity (e): 0.188

Orbit Range: 5.88 AU - 8.6 AU

Year: 13447 Days

Day: 15.7 Hours

Environment

Temp: -238 °C

Axial Tilt: 25.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (54)

Outer Limit: 41,000,879 km

• M1: 140,772 km (0.085 R)
• M2: 310,416 km (0.1 R)
• M3: 426,653 km (0.098 R)
• M4: 614,847 km (0.101 R)
• M5: 1,361,490 km (0.091 R)
• M6: 3,610,096 km (0.095 R)
• M7: 4,541,343 km (0.108 R)
• M8: 4,837,546 km (0.12 R)
• M9: 5,109,515 km (0.112 R)
• M10: 5,170,701 km (0.105 R)
• M11: 6,084,145 km (0.076 R)
• M12: 6,476,541 km (0.085 R)
• M13: 6,776,335 km (0.034 R)
• M14: 7,562,771 km (0.035 R)
• M15: 8,126,904 km (0.118 R)
• M16: 9,520,109 km (0.099 R)
• M17: 9,671,054 km (0.12 R)
• M18: 11,663,847 km (0.091 R)
• M19: 12,191,478 km (0.078 R)
• M20: 13,650,656 km (0.083 R)
• M21: 15,340,364 km (0.087 R)
• M22: 15,517,338 km (0.063 R)
• M23: 16,052,600 km (0.047 R)
• M24: 16,639,023 km (0.101 R)
• M25: 17,508,935 km (0.105 R)
• M26: 19,197,296 km (0.083 R)
• M27: 19,483,627 km (0.091 R)
• M28: 21,034,957 km (0.079 R)
• M29: 21,775,616 km (0.083 R)
• M30: 21,875,098 km (0.088 R)
• M31: 23,690,169 km (0.098 R)
• M32: 24,048,755 km (0.102 R)
• M33: 25,030,865 km (0.103 R)
• M34: 25,082,925 km (0.113 R)
• M35: 27,462,579 km (0.097 R)
• M36: 28,434,366 km (0.028 R)
• M37: 28,597,428 km (0.092 R)
• M38: 28,979,202 km (0.073 R)
• M39: 29,143,311 km (0.109 R)
• M40: 31,810,790 km (0.105 R)
• M41: 32,036,534 km (0.092 R)
• M42: 32,093,082 km (0.108 R)
• M43: 32,376,270 km (0.082 R)
• M44: 33,287,920 km (0.109 R)
• M45: 33,861,927 km (0.088 R)
• M46: 34,903,577 km (0.1 R)
• M47: 35,019,964 km (0.106 R)
• M48: 35,428,217 km (0.096 R)
• M49: 35,603,695 km (0.094 R)
• M50: 36,603,607 km (0.094 R)
• M51: 37,732,024 km (0.117 R)
• M52: 38,270,576 km (0.115 R)
• M53: 38,992,386 km (0.045 R)
• M54: 40,266,660 km (0.04 R)

Kuiper Belt

Range: 30 - 47 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 278 - 19,678 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit