🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.53 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.43

Radius: 1.64

Gravity: 1.28 G

Time & Orbit

Eccentricity (e): 0.225

Orbit Range: 0.41 AU - 0.65 AU

Year: 137 Days

Day: 42.7 Hours

Environment

Temp: 210 °C

Axial Tilt: 45.7 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 0.97 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.41

Radius: 1.42

Gravity: 1.2 G

Time & Orbit

Eccentricity (e): 0.062

Orbit Range: 0.91 AU - 1.03 AU

Year: 339 Days

Day: 16.3 Hours

Environment

Temp: 163 °C

Axial Tilt: 25.6 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (1)

Outer Limit: 73,307,536 km

• M1: 645,365 km (0.082 R)

Planet 3 - Terrestrial

Semi-Major Axis: 1.23 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.67

Radius: 1.48

Gravity: 1.22 G

Time & Orbit

Eccentricity (e): 0.005

Orbit Range: 1.22 AU - 1.24 AU

Year: 484 Days

Day: 44.3 Hours

Environment

Temp: 16 °C

Axial Tilt: 14 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Planet 4 - Terrestrial

Semi-Major Axis: 4.07 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.41

Radius: 1.42

Gravity: 1.2 G

Time & Orbit

Eccentricity (e): 0.198

Orbit Range: 3.26 AU - 4.88 AU

Year: 2913 Days

Day: 30.6 Hours

Environment

Temp: -123 °C

Axial Tilt: 41.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 5.85 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 5 - Gas Giant

Semi-Major Axis: 7.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 713.4

Radius: 14.5

Gravity: 3.39 G

Time & Orbit

Eccentricity (e): 0.038

Orbit Range: 7.34 AU - 7.92 AU

Year: 7477 Days

Day: 13.9 Hours

Environment

Temp: -159 °C

Axial Tilt: 37.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (82)

Outer Limit: 73,307,536 km

• M1: 181,612 km (0.073 R)
• M2: 452,534 km (0.097 R)
• M3: 612,454 km (0.098 R)
• M4: 751,281 km (0.113 R)
• M5: 1,031,627 km (0.112 R)
• M6: 1,185,264 km (0.102 R)
• M7: 1,365,529 km (0.035 R)
• M8: 1,673,851 km (0.116 R)
• M9: 2,178,743 km (0.065 R)
• M10: 2,541,518 km (0.057 R)
• M11: 2,635,316 km (0.114 R)
• M12: 2,730,311 km (0.075 R)
• M13: 2,850,887 km (0.104 R)
• M14: 2,973,108 km (0.104 R)
• M15: 3,248,518 km (0.113 R)
• M16: 3,664,250 km (0.092 R)
• M17: 3,905,701 km (0.108 R)
• M18: 4,180,213 km (0.093 R)
• M19: 4,404,461 km (0.046 R)
• M20: 4,575,301 km (0.029 R)
• M21: 4,982,656 km (0.106 R)
• M22: 6,052,131 km (0.08 R)
• M23: 6,306,597 km (0.095 R)
• M24: 6,467,266 km (0.118 R)
• M25: 8,114,488 km (0.076 R)
• M26: 9,220,614 km (0.101 R)
• M27: 9,922,079 km (0.073 R)
• M28: 11,454,559 km (0.111 R)
• M29: 11,888,842 km (0.097 R)
• M30: 12,208,233 km (0.106 R)
• M31: 12,368,902 km (0.106 R)
• M32: 12,733,172 km (0.079 R)
• M33: 13,638,389 km (0.072 R)
• M34: 13,972,740 km (0.114 R)
• M35: 14,098,851 km (0.117 R)
• M36: 14,394,457 km (0.062 R)
• M37: 14,564,400 km (0.09 R)
• M38: 15,078,119 km (0.026 R)
• M39: 15,684,888 km (0.042 R)
• M40: 16,654,731 km (0.082 R)
• M41: 16,967,390 km (0.093 R)
• M42: 17,462,559 km (0.09 R)
• M43: 18,191,550 km (0.082 R)
• M44: 18,375,256 km (0.037 R)
• M45: 18,930,414 km (0.057 R)
• M46: 19,490,957 km (0.091 R)
• M47: 19,915,067 km (0.062 R)
• M48: 20,057,035 km (0.112 R)
• M49: 20,532,906 km (0.096 R)
• M50: 21,060,687 km (0.105 R)
• M51: 21,157,178 km (0.097 R)
• M52: 21,495,868 km (0.086 R)
• M53: 22,473,639 km (0.099 R)
• M54: 22,670,959 km (0.104 R)
• M55: 23,916,960 km (0.108 R)
• M56: 24,370,989 km (0.05 R)
• M57: 24,522,981 km (0.071 R)
• M58: 25,338,887 km (0.081 R)
• M59: 25,441,511 km (0.111 R)
• M60: 26,111,860 km (0.068 R)
• M61: 26,475,382 km (0.086 R)
• M62: 27,892,673 km (0.088 R)
• M63: 28,211,017 km (0.08 R)
• M64: 28,530,558 km (0.059 R)
• M65: 28,797,740 km (0.038 R)
• M66: 28,958,557 km (0.119 R)
• M67: 29,334,646 km (0.055 R)
• M68: 30,418,483 km (0.118 R)
• M69: 31,349,879 km (0.103 R)
• M70: 31,791,492 km (0.047 R)
• M71: 32,402,001 km (0.033 R)
• M72: 33,128,598 km (0.08 R)
• M73: 33,747,634 km (0.076 R)
• M74: 33,860,580 km (0.069 R)
• M75: 34,711,792 km (0.12 R)
• M76: 34,882,932 km (0.03 R)
• M77: 35,512,590 km (0.118 R)
• M78: 35,915,307 km (0.085 R)
• M79: 36,030,647 km (0.055 R)
• M80: 39,309,832 km (0.077 R)
• M81: 39,786,152 km (0.114 R)
• M82: 40,024,910 km (0.094 R)

Planet 6 - Gas Giant

Semi-Major Axis: 7.72 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 272.8

Radius: 13.6

Gravity: 1.47 G

Time & Orbit

Eccentricity (e): 0.247

Orbit Range: 5.81 AU - 9.63 AU

Year: 7610 Days

Day: 5.7 Hours

Environment

Temp: -155 °C

Axial Tilt: 37.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (82)

Outer Limit: 73,307,536 km

• M1: 222,751 km (0.054 R)
• M2: 360,531 km (0.039 R)
• M3: 486,193 km (0.089 R)
• M4: 642,373 km (0.092 R)
• M5: 945,159 km (0.036 R)
• M6: 1,163,423 km (0.114 R)
• M7: 1,399,189 km (0.084 R)
• M8: 1,491,790 km (0.103 R)
• M9: 1,935,348 km (0.098 R)
• M10: 2,290,343 km (0.111 R)
• M11: 2,419,596 km (0.114 R)
• M12: 2,570,391 km (0.101 R)
• M13: 2,666,283 km (0.12 R)
• M14: 2,802,716 km (0.04 R)
• M15: 3,669,935 km (0.046 R)
• M16: 3,910,339 km (0.059 R)
• M17: 4,021,340 km (0.115 R)
• M18: 4,292,113 km (0.12 R)
• M19: 4,522,344 km (0.115 R)
• M20: 4,686,004 km (0.09 R)
• M21: 4,780,550 km (0.102 R)
• M22: 4,899,480 km (0.104 R)
• M23: 5,043,543 km (0.099 R)
• M24: 5,533,924 km (0.069 R)
• M25: 6,194,549 km (0.118 R)
• M26: 6,481,777 km (0.055 R)
• M27: 7,534,796 km (0.11 R)
• M28: 7,869,596 km (0.08 R)
• M29: 8,237,756 km (0.079 R)
• M30: 8,352,199 km (0.116 R)
• M31: 8,553,857 km (0.048 R)
• M32: 8,727,989 km (0.09 R)
• M33: 9,168,255 km (0.092 R)
• M34: 9,495,874 km (0.088 R)
• M35: 9,827,383 km (0.098 R)
• M36: 10,408,870 km (0.106 R)
• M37: 10,501,771 km (0.09 R)
• M38: 10,813,233 km (0.05 R)
• M39: 10,970,161 km (0.074 R)
• M40: 11,096,272 km (0.091 R)
• M41: 11,254,547 km (0.079 R)
• M42: 12,812,010 km (0.105 R)
• M43: 13,955,985 km (0.111 R)
• M44: 14,092,718 km (0.062 R)
• M45: 14,574,722 km (0.118 R)
• M46: 15,378,512 km (0.089 R)
• M47: 15,519,732 km (0.107 R)
• M48: 15,661,401 km (0.117 R)
• M49: 15,768,064 km (0.092 R)
• M50: 15,946,086 km (0.082 R)
• M51: 16,053,348 km (0.09 R)
• M52: 16,376,329 km (0.032 R)
• M53: 16,665,352 km (0.079 R)
• M54: 17,285,136 km (0.094 R)
• M55: 17,727,048 km (0.088 R)
• M56: 17,986,601 km (0.047 R)
• M57: 18,247,499 km (0.105 R)
• M58: 18,697,490 km (0.077 R)
• M59: 19,075,374 km (0.089 R)
• M60: 19,265,363 km (0.045 R)
• M61: 19,646,988 km (0.119 R)
• M62: 19,915,665 km (0.05 R)
• M63: 20,262,882 km (0.077 R)
• M64: 20,728,879 km (0.06 R)
• M65: 20,924,105 km (0.092 R)
• M66: 21,198,617 km (0.104 R)
• M67: 21,474,176 km (0.117 R)
• M68: 21,632,151 km (0.114 R)
• M69: 21,750,932 km (0.099 R)
• M70: 21,949,299 km (0.047 R)
• M71: 22,228,149 km (0.104 R)
• M72: 22,990,799 km (0.11 R)
• M73: 23,436,302 km (0.088 R)
• M74: 23,843,806 km (0.115 R)
• M75: 24,872,740 km (0.1 R)
• M76: 25,580,637 km (0.116 R)
• M77: 26,591,470 km (0.042 R)
• M78: 26,846,235 km (0.111 R)
• M79: 27,358,159 km (0.088 R)
• M80: 27,443,729 km (0.119 R)
• M81: 27,572,384 km (0.116 R)
• M82: 28,434,965 km (0.111 R)

Planet 7 - Gas Giant

Semi-Major Axis: 8.99 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 474.5

Radius: 13.4

Gravity: 2.64 G

Time & Orbit

Eccentricity (e): 0.129

Orbit Range: 7.83 AU - 10.15 AU

Year: 9563 Days

Day: 5.5 Hours

Environment

Temp: -156 °C

Axial Tilt: 21.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 73,307,536 km

• M1: 167,998 km (0.114 R)
• M2: 274,063 km (0.114 R)
• M3: 358,736 km (0.062 R)
• M4: 532,269 km (0.093 R)
• M5: 769,232 km (0.116 R)
• M6: 1,025,643 km (0.074 R)
• M7: 1,236,875 km (0.088 R)
• M8: 1,386,174 km (0.11 R)
• M9: 1,541,756 km (0.102 R)
• M10: 1,786,498 km (0.081 R)
• M11: 2,383,692 km (0.097 R)
• M12: 2,500,977 km (0.071 R)
• M13: 2,741,531 km (0.107 R)
• M14: 2,889,632 km (0.093 R)
• M15: 3,219,645 km (0.025 R)
• M16: 3,972,123 km (0.061 R)
• M17: 4,055,897 km (0.089 R)
• M18: 4,282,389 km (0.107 R)
• M19: 4,484,047 km (0.068 R)
• M20: 4,571,561 km (0.118 R)
• M21: 4,718,466 km (0.109 R)
• M22: 5,291,426 km (0.08 R)
• M23: 5,477,077 km (0.075 R)
• M24: 6,111,372 km (0.082 R)
• M25: 6,937,152 km (0.048 R)
• M26: 7,380,411 km (0.1 R)
• M27: 8,656,032 km (0.115 R)
• M28: 9,694,840 km (0.105 R)
• M29: 10,616,512 km (0.073 R)
• M30: 11,246,618 km (0.098 R)
• M31: 11,405,940 km (0.054 R)
• M32: 12,460,455 km (0.082 R)
• M33: 13,377,191 km (0.046 R)
• M34: 14,186,216 km (0.089 R)
• M35: 14,315,469 km (0.098 R)
• M36: 14,749,004 km (0.065 R)
• M37: 15,807,109 km (0.112 R)
• M38: 16,075,488 km (0.096 R)
• M39: 16,210,276 km (0.114 R)
• M40: 16,662,211 km (0.1 R)
• M41: 16,981,004 km (0.074 R)
• M42: 17,578,498 km (0.111 R)
• M43: 19,747,517 km (0.098 R)
• M44: 20,133,330 km (0.066 R)
• M45: 20,230,270 km (0.06 R)
• M46: 21,059,790 km (0.047 R)
• M47: 21,651,898 km (0.05 R)
• M48: 22,199,726 km (0.119 R)
• M49: 22,349,772 km (0.078 R)
• M50: 22,751,891 km (0.102 R)
• M51: 23,512,297 km (0.038 R)
• M52: 23,869,986 km (0.066 R)
• M53: 26,849,377 km (0.059 R)
• M54: 27,760,578 km (0.095 R)
• M55: 28,138,611 km (0.109 R)
• M56: 29,557,996 km (0.071 R)
• M57: 29,778,503 km (0.097 R)
• M58: 30,332,015 km (0.051 R)
• M59: 30,498,667 km (0.111 R)
• M60: 30,609,968 km (0.082 R)
• M61: 31,168,567 km (0.041 R)
• M62: 32,182,541 km (0.084 R)
• M63: 32,522,876 km (0.091 R)
• M64: 32,693,567 km (0.114 R)
• M65: 33,150,140 km (0.091 R)
• M66: 33,379,174 km (0.119 R)
• M67: 33,551,212 km (0.119 R)
• M68: 35,172,105 km (0.094 R)
• M69: 35,347,284 km (0.099 R)
• M70: 35,464,120 km (0.077 R)
• M71: 35,698,390 km (0.057 R)
• M72: 36,581,616 km (0.039 R)
• M73: 37,710,482 km (0.046 R)
• M74: 38,129,356 km (0.088 R)
• M75: 39,577,014 km (0.062 R)
• M76: 39,759,224 km (0.093 R)
• M77: 40,552,093 km (0.113 R)

Planet 8 - Gas Giant

Semi-Major Axis: 10.09 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 632.4

Radius: 12.6

Gravity: 3.98 G

Time & Orbit

Eccentricity (e): 0.235

Orbit Range: 7.72 AU - 12.46 AU

Year: 11370 Days

Day: 6.7 Hours

Environment

Temp: -162 °C

Axial Tilt: 2.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 73,307,536 km

• M1: 407,056 km (0.065 R)
• M2: 502,948 km (0.057 R)
• M3: 624,571 km (0.117 R)
• M4: 792,719 km (0.096 R)
• M5: 901,626 km (0.065 R)
• M6: 1,197,830 km (0.109 R)
• M7: 1,525,300 km (0.091 R)
• M8: 2,107,684 km (0.039 R)
• M9: 2,783,568 km (0.116 R)
• M10: 3,370,440 km (0.089 R)
• M11: 4,059,937 km (0.07 R)
• M12: 4,321,583 km (0.092 R)
• M13: 4,588,765 km (0.091 R)
• M14: 5,209,895 km (0.043 R)
• M15: 6,416,851 km (0.112 R)
• M16: 6,760,777 km (0.086 R)
• M17: 6,954,356 km (0.101 R)
• M18: 7,707,133 km (0.12 R)
• M19: 8,652,741 km (0.115 R)
• M20: 8,947,897 km (0.057 R)
• M21: 9,418,383 km (0.086 R)
• M22: 10,250,147 km (0.081 R)
• M23: 10,517,777 km (0.058 R)
• M24: 11,196,802 km (0.101 R)
• M25: 12,265,529 km (0.106 R)
• M26: 12,407,348 km (0.118 R)
• M27: 12,883,967 km (0.103 R)
• M28: 13,076,350 km (0.076 R)
• M29: 13,561,346 km (0.073 R)
• M30: 13,659,034 km (0.116 R)
• M31: 14,250,394 km (0.103 R)
• M32: 14,950,811 km (0.093 R)
• M33: 15,867,846 km (0.105 R)
• M34: 16,489,276 km (0.111 R)
• M35: 17,224,549 km (0.072 R)
• M36: 17,436,529 km (0.031 R)
• M37: 19,328,494 km (0.065 R)
• M38: 20,494,609 km (0.063 R)
• M39: 21,228,087 km (0.092 R)
• M40: 21,341,632 km (0.083 R)
• M41: 21,969,943 km (0.118 R)
• M42: 22,257,620 km (0.058 R)
• M43: 24,187,283 km (0.071 R)
• M44: 25,745,046 km (0.027 R)
• M45: 25,866,220 km (0.064 R)
• M46: 26,291,826 km (0.108 R)
• M47: 26,475,083 km (0.057 R)
• M48: 26,842,496 km (0.088 R)
• M49: 27,211,703 km (0.042 R)
• M50: 27,706,573 km (0.057 R)
• M51: 27,830,889 km (0.114 R)
• M52: 29,652,392 km (0.096 R)
• M53: 30,931,005 km (0.1 R)
• M54: 31,318,165 km (0.107 R)
• M55: 32,554,441 km (0.039 R)
• M56: 33,541,787 km (0.082 R)
• M57: 34,272,124 km (0.112 R)
• M58: 34,605,877 km (0.068 R)
• M59: 34,806,637 km (0.098 R)
• M60: 35,816,124 km (0.073 R)
• M61: 36,290,499 km (0.05 R)
• M62: 36,426,483 km (0.085 R)
• M63: 36,562,468 km (0.096 R)
• M64: 37,726,189 km (0.058 R)
• M65: 38,971,592 km (0.11 R)
• M66: 39,739,178 km (0.078 R)
• M67: 40,230,308 km (0.109 R)
• M68: 40,794,143 km (0.12 R)
• M69: 41,289,461 km (0.049 R)
• M70: 42,286,381 km (0.055 R)
• M71: 42,716,026 km (0.093 R)
• M72: 42,931,298 km (0.088 R)
• M73: 43,579,655 km (0.086 R)
• M74: 44,740,086 km (0.092 R)
• M75: 44,958,798 km (0.042 R)
• M76: 45,910,839 km (0.089 R)
• M77: 47,834,518 km (0.105 R)
• M78: 48,731,207 km (0.063 R)
• M79: 50,162,410 km (0.061 R)

Planet 9 - Ice Giant

Semi-Major Axis: 18.49 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 308

Radius: 4.2

Gravity: 17.46 G

Time & Orbit

Eccentricity (e): 0.212

Orbit Range: 14.57 AU - 22.41 AU

Year: 28206 Days

Day: 23.8 Hours

Environment

Temp: -200 °C

Axial Tilt: 64.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 73,307,536 km

• M1: 616,493 km (0.071 R)
• M2: 1,075,459 km (0.089 R)
• M3: 1,322,595 km (0.102 R)
• M4: 1,803,851 km (0.056 R)
• M5: 1,964,519 km (0.083 R)
• M6: 2,163,484 km (0.076 R)
• M7: 2,724,776 km (0.12 R)
• M8: 3,250,911 km (0.08 R)
• M9: 3,328,553 km (0.115 R)
• M10: 3,485,930 km (0.066 R)
• M11: 3,685,792 km (0.114 R)
• M12: 3,930,834 km (0.095 R)
• M13: 4,565,877 km (0.099 R)
• M14: 4,873,001 km (0.087 R)
• M15: 5,415,144 km (0.082 R)
• M16: 6,506,311 km (0.038 R)
• M17: 7,101,860 km (0.068 R)
• M18: 7,152,274 km (0.061 R)
• M19: 7,304,266 km (0.088 R)
• M20: 7,663,001 km (0.063 R)
• M21: 8,504,340 km (0.09 R)
• M22: 9,876,302 km (0.105 R)
• M23: 11,197,849 km (0.099 R)
• M24: 12,880,077 km (0.114 R)
• M25: 13,437,330 km (0.085 R)
• M26: 14,383,536 km (0.052 R)
• M27: 15,026,059 km (0.088 R)
• M28: 15,678,006 km (0.038 R)
• M29: 18,100,146 km (0.111 R)
• M30: 19,003,118 km (0.049 R)
• M31: 19,283,764 km (0.085 R)
• M32: 19,424,685 km (0.114 R)
• M33: 21,287,179 km (0.045 R)
• M34: 22,387,321 km (0.085 R)
• M35: 22,609,474 km (0.1 R)
• M36: 23,580,963 km (0.062 R)
• M37: 23,731,608 km (0.048 R)
• M38: 24,185,488 km (0.078 R)
• M39: 24,642,360 km (0.065 R)
• M40: 24,718,655 km (0.105 R)
• M41: 24,948,437 km (0.027 R)
• M42: 25,874,298 km (0.119 R)
• M43: 25,951,939 km (0.048 R)
• M44: 27,283,959 km (0.045 R)
• M45: 27,679,944 km (0.063 R)
• M46: 29,201,953 km (0.114 R)
• M47: 30,504,651 km (0.108 R)
• M48: 33,419,566 km (0.049 R)
• M49: 33,588,761 km (0.062 R)
• M50: 33,843,227 km (0.093 R)
• M51: 34,353,954 km (0.083 R)
• M52: 35,555,375 km (0.107 R)
• M53: 36,161,246 km (0.113 R)
• M54: 38,796,413 km (0.106 R)
• M55: 39,152,306 km (0.109 R)
• M56: 39,598,856 km (0.082 R)
• M57: 39,777,924 km (0.055 R)
• M58: 41,947,841 km (0.062 R)
• M59: 42,404,713 km (0.067 R)
• M60: 43,047,086 km (0.027 R)
• M61: 44,993,504 km (0.11 R)
• M62: 48,109,478 km (0.045 R)
• M63: 49,163,695 km (0.089 R)
• M64: 49,741,741 km (0.101 R)
• M65: 50,419,120 km (0.048 R)
• M66: 51,294,567 km (0.042 R)
• M67: 54,149,044 km (0.092 R)
• M68: 55,245,297 km (0.091 R)
• M69: 56,047,141 km (0.058 R)
• M70: 56,147,671 km (0.114 R)
• M71: 57,763,777 km (0.099 R)
• M72: 64,484,461 km (0.083 R)
• M73: 65,222,876 km (0.11 R)
• M74: 69,603,401 km (0.12 R)
• M75: 69,711,411 km (0.049 R)
• M76: 72,430,203 km (0.066 R)
• M77: 72,539,708 km (0.114 R)

Kuiper Belt

Range: 30.9 - 53.9 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 332 - 14,446 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit