🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.56 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.54

Radius: 0.78

Gravity: 0.89 G

Time & Orbit

Eccentricity (e): 0.195

Orbit Range: 0.45 AU - 0.67 AU

Year: 275 Days

Day: 22 Hours

Environment

Temp: -114 °C

Axial Tilt: 11.2 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Gas Giant

Semi-Major Axis: 0.76 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 385.5

Radius: 12.4

Gravity: 2.51 G

Time & Orbit

Eccentricity (e): 0.118

Orbit Range: 0.67 AU - 0.85 AU

Year: 435 Days

Day: 6.7 Hours

Environment

Temp: -141 °C

Axial Tilt: 26 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (35)

Outer Limit: 55,986,468 km

• M1: 158,275 km (0.053 R)
• M2: 238,160 km (0.104 R)
• M3: 343,776 km (0.05 R)
• M4: 432,188 km (0.088 R)
• M5: 581,188 km (0.103 R)
• M6: 704,307 km (0.095 R)
• M7: 818,899 km (0.069 R)
• M8: 948,301 km (0.082 R)
• M9: 1,028,037 km (0.077 R)
• M10: 1,110,166 km (0.12 R)
• M11: 1,255,276 km (0.11 R)
• M12: 1,375,403 km (0.114 R)
• M13: 1,462,319 km (0.114 R)
• M14: 1,661,434 km (0.056 R)
• M15: 1,859,502 km (0.103 R)
• M16: 1,982,321 km (0.092 R)
• M17: 2,091,977 km (0.089 R)
• M18: 2,193,105 km (0.045 R)
• M19: 2,339,711 km (0.069 R)
• M20: 2,422,588 km (0.098 R)
• M21: 2,506,512 km (0.119 R)
• M22: 2,917,158 km (0.086 R)
• M23: 3,006,618 km (0.088 R)
• M24: 3,151,878 km (0.106 R)
• M25: 3,287,114 km (0.112 R)
• M26: 3,399,312 km (0.078 R)
• M27: 3,493,709 km (0.093 R)
• M28: 3,589,003 km (0.106 R)
• M29: 3,704,492 km (0.106 R)
• M30: 3,795,298 km (0.087 R)
• M31: 4,132,342 km (0.057 R)
• M32: 4,226,589 km (0.074 R)
• M33: 4,335,047 km (0.102 R)
• M34: 4,444,702 km (0.094 R)
• M35: 4,715,624 km (0.116 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.22 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 511.7

Radius: 8.2

Gravity: 7.61 G

Time & Orbit

Eccentricity (e): 0.149

Orbit Range: 1.04 AU - 1.4 AU

Year: 884 Days

Day: 8.5 Hours

Environment

Temp: -167 °C

Axial Tilt: 35.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 55,986,468 km

• M1: 111,750 km (0.072 R)
• M2: 211,980 km (0.104 R)
• M3: 309,668 km (0.073 R)
• M4: 400,473 km (0.108 R)
• M5: 452,085 km (0.091 R)
• M6: 563,236 km (0.109 R)
• M7: 699,819 km (0.044 R)
• M8: 786,137 km (0.035 R)
• M9: 853,456 km (0.099 R)
• M10: 988,094 km (0.102 R)
• M11: 1,136,196 km (0.101 R)
• M12: 1,206,656 km (0.053 R)
• M13: 1,331,870 km (0.075 R)
• M14: 1,489,396 km (0.106 R)
• M15: 1,545,645 km (0.051 R)
• M16: 1,653,056 km (0.074 R)
• M17: 1,704,069 km (0.055 R)
• M18: 1,852,770 km (0.079 R)
• M19: 1,967,212 km (0.097 R)
• M20: 2,084,048 km (0.103 R)
• M21: 2,179,192 km (0.072 R)
• M22: 2,324,601 km (0.086 R)
• M23: 2,423,336 km (0.114 R)
• M24: 2,506,812 km (0.077 R)
• M25: 2,574,280 km (0.082 R)
• M26: 2,685,132 km (0.05 R)
• M27: 2,867,642 km (0.109 R)
• M28: 2,955,904 km (0.104 R)
• M29: 3,063,166 km (0.1 R)
• M30: 3,162,649 km (0.072 R)
• M31: 3,392,730 km (0.102 R)
• M32: 3,505,078 km (0.116 R)
• M33: 3,590,199 km (0.091 R)
• M34: 3,820,580 km (0.091 R)
• M35: 3,986,783 km (0.047 R)
• M36: 4,095,541 km (0.087 R)
• M37: 4,175,277 km (0.096 R)
• M38: 4,275,657 km (0.052 R)
• M39: 4,417,625 km (0.1 R)
• M40: 4,499,306 km (0.092 R)
• M41: 4,643,817 km (0.054 R)
• M42: 4,884,370 km (0.08 R)
• M43: 5,054,164 km (0.118 R)
• M44: 5,172,047 km (0.078 R)
• M45: 5,247,445 km (0.084 R)
• M46: 5,323,291 km (0.087 R)
• M47: 5,999,772 km (0.102 R)
• M48: 6,056,470 km (0.077 R)
• M49: 6,365,389 km (0.089 R)
• M50: 7,070,594 km (0.096 R)
• M51: 7,154,518 km (0.076 R)
• M52: 7,214,657 km (0.112 R)
• M53: 7,335,382 km (0.086 R)
• M54: 7,444,588 km (0.059 R)
• M55: 7,578,927 km (0.048 R)
• M56: 7,701,598 km (0.088 R)
• M57: 7,800,332 km (0.106 R)
• M58: 7,998,998 km (0.109 R)
• M59: 8,149,194 km (0.081 R)
• M60: 8,363,419 km (0.066 R)
• M61: 8,502,993 km (0.057 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.4 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 793.5

Radius: 13.8

Gravity: 4.17 G

Time & Orbit

Eccentricity (e): 0.075

Orbit Range: 1.3 AU - 1.51 AU

Year: 1087 Days

Day: 5.7 Hours

Environment

Temp: -183 °C

Axial Tilt: 13.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (53)

Outer Limit: 55,986,468 km

• M1: 173,534 km (0.105 R)
• M2: 313,258 km (0.096 R)
• M3: 566,826 km (0.114 R)
• M4: 670,647 km (0.103 R)
• M5: 1,005,447 km (0.085 R)
• M6: 1,242,859 km (0.105 R)
• M7: 1,376,749 km (0.119 R)
• M8: 1,482,664 km (0.111 R)
• M9: 1,685,968 km (0.088 R)
• M10: 1,962,574 km (0.073 R)
• M11: 2,283,163 km (0.084 R)
• M12: 2,420,194 km (0.075 R)
• M13: 2,754,396 km (0.116 R)
• M14: 2,932,417 km (0.088 R)
• M15: 3,179,553 km (0.108 R)
• M16: 3,534,998 km (0.076 R)
• M17: 3,740,545 km (0.113 R)
• M18: 3,856,633 km (0.058 R)
• M19: 4,009,223 km (0.118 R)
• M20: 4,175,875 km (0.064 R)
• M21: 4,602,827 km (0.059 R)
• M22: 4,689,893 km (0.084 R)
• M23: 4,903,669 km (0.113 R)
• M24: 5,236,973 km (0.096 R)
• M25: 5,393,452 km (0.12 R)
• M26: 5,485,455 km (0.067 R)
• M27: 5,670,956 km (0.091 R)
• M28: 5,818,160 km (0.098 R)
• M29: 5,939,484 km (0.06 R)
• M30: 6,061,855 km (0.066 R)
• M31: 6,226,263 km (0.1 R)
• M32: 6,742,376 km (0.105 R)
• M33: 7,041,572 km (0.082 R)
• M34: 7,301,573 km (0.111 R)
• M35: 7,418,110 km (0.114 R)
• M36: 7,520,584 km (0.048 R)
• M37: 7,667,938 km (0.075 R)
• M38: 8,025,327 km (0.098 R)
• M39: 8,145,604 km (0.105 R)
• M40: 8,296,997 km (0.106 R)
• M41: 8,388,252 km (0.067 R)
• M42: 8,602,476 km (0.072 R)
• M43: 8,771,970 km (0.064 R)
• M44: 8,895,987 km (0.04 R)
• M45: 9,036,310 km (0.072 R)
• M46: 9,382,330 km (0.072 R)
• M47: 9,572,768 km (0.074 R)
• M48: 9,861,043 km (0.085 R)
• M49: 10,006,302 km (0.092 R)
• M50: 10,103,541 km (0.057 R)
• M51: 10,479,181 km (0.067 R)
• M52: 10,776,283 km (0.066 R)
• M53: 11,362,108 km (0.099 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 79

Radius: 11.3

Gravity: 0.62 G

Time & Orbit

Eccentricity (e): 0.186

Orbit Range: 1.27 AU - 1.85 AU

Year: 1278 Days

Day: 12.9 Hours

Environment

Temp: -187 °C

Axial Tilt: 34.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (32)

Outer Limit: 55,986,468 km

• M1: 167,550 km (0.068 R)
• M2: 315,203 km (0.114 R)
• M3: 456,423 km (0.084 R)
• M4: 589,266 km (0.12 R)
• M5: 696,677 km (0.069 R)
• M6: 803,191 km (0.093 R)
• M7: 955,930 km (0.109 R)
• M8: 1,047,783 km (0.083 R)
• M9: 1,167,163 km (0.094 R)
• M10: 1,266,196 km (0.051 R)
• M11: 1,569,880 km (0.032 R)
• M12: 1,730,548 km (0.09 R)
• M13: 1,804,450 km (0.095 R)
• M14: 1,908,570 km (0.105 R)
• M15: 2,092,725 km (0.09 R)
• M16: 2,239,331 km (0.106 R)
• M17: 2,383,244 km (0.067 R)
• M18: 2,459,539 km (0.082 R)
• M19: 2,608,239 km (0.058 R)
• M20: 3,246,573 km (0.088 R)
• M21: 3,338,725 km (0.108 R)
• M22: 3,482,040 km (0.09 R)
• M23: 3,634,929 km (0.09 R)
• M24: 3,797,392 km (0.081 R)
• M25: 3,954,769 km (0.102 R)
• M26: 4,440,065 km (0.081 R)
• M27: 4,542,689 km (0.085 R)
• M28: 4,774,266 km (0.045 R)
• M29: 4,903,669 km (0.111 R)
• M30: 5,100,091 km (0.12 R)
• M31: 5,559,954 km (0.085 R)
• M32: 5,747,700 km (0.096 R)

Planet 6 - Gas Giant

Semi-Major Axis: 3.4 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 753.2

Radius: 15

Gravity: 3.35 G

Time & Orbit

Eccentricity (e): 0.064

Orbit Range: 3.18 AU - 3.62 AU

Year: 4113 Days

Day: 9.1 Hours

Environment

Temp: -206 °C

Axial Tilt: 28.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (68)

Outer Limit: 55,986,468 km

• M1: 188,942 km (0.072 R)
• M2: 287,527 km (0.104 R)
• M3: 420,370 km (0.115 R)
• M4: 546,631 km (0.087 R)
• M5: 767,138 km (0.112 R)
• M6: 957,277 km (0.104 R)
• M7: 1,097,899 km (0.049 R)
• M8: 1,205,160 km (0.056 R)
• M9: 1,344,436 km (0.075 R)
• M10: 1,519,466 km (0.066 R)
• M11: 1,749,397 km (0.114 R)
• M12: 2,057,719 km (0.098 R)
• M13: 2,419,297 km (0.05 R)
• M14: 2,895,616 km (0.11 R)
• M15: 3,048,206 km (0.088 R)
• M16: 3,282,177 km (0.107 R)
• M17: 3,421,602 km (0.039 R)
• M18: 3,851,696 km (0.098 R)
• M19: 4,255,910 km (0.025 R)
• M20: 4,651,746 km (0.09 R)
• M21: 5,198,077 km (0.105 R)
• M22: 6,327,242 km (0.12 R)
• M23: 6,501,823 km (0.034 R)
• M24: 6,906,934 km (0.106 R)
• M25: 7,689,031 km (0.102 R)
• M26: 8,747,586 km (0.11 R)
• M27: 9,564,390 km (0.087 R)
• M28: 9,736,428 km (0.067 R)
• M29: 9,967,407 km (0.054 R)
• M30: 10,939,793 km (0.082 R)
• M31: 11,119,759 km (0.113 R)
• M32: 11,270,554 km (0.108 R)
• M33: 11,819,129 km (0.07 R)
• M34: 12,158,717 km (0.101 R)
• M35: 12,847,465 km (0.078 R)
• M36: 13,196,627 km (0.111 R)
• M37: 13,356,397 km (0.104 R)
• M38: 13,710,196 km (0.096 R)
• M39: 14,492,743 km (0.071 R)
• M40: 14,989,258 km (0.083 R)
• M41: 15,256,440 km (0.113 R)
• M42: 15,390,629 km (0.051 R)
• M43: 16,203,693 km (0.046 R)
• M44: 16,443,648 km (0.085 R)
• M45: 16,615,686 km (0.106 R)
• M46: 17,204,952 km (0.083 R)
• M47: 17,590,017 km (0.099 R)
• M48: 17,766,094 km (0.09 R)
• M49: 18,404,428 km (0.112 R)
• M50: 18,690,608 km (0.026 R)
• M51: 19,158,700 km (0.076 R)
• M52: 19,703,685 km (0.025 R)
• M53: 19,996,448 km (0.099 R)
• M54: 21,444,256 km (0.067 R)
• M55: 21,783,096 km (0.113 R)
• M56: 21,934,339 km (0.109 R)
• M57: 23,002,468 km (0.114 R)
• M58: 23,542,965 km (0.078 R)
• M59: 23,698,247 km (0.052 R)
• M60: 24,126,696 km (0.09 R)
• M61: 24,715,214 km (0.076 R)
• M62: 24,873,040 km (0.063 R)
• M63: 25,189,439 km (0.076 R)
• M64: 25,986,497 km (0.099 R)
• M65: 26,106,773 km (0.112 R)
• M66: 26,509,042 km (0.064 R)
• M67: 26,913,405 km (0.082 R)
• M68: 27,238,332 km (0.117 R)

Planet 7 - Gas Giant

Semi-Major Axis: 4.46 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 402

Radius: 13.5

Gravity: 2.21 G

Time & Orbit

Eccentricity (e): 0.109

Orbit Range: 3.97 AU - 4.95 AU

Year: 6179 Days

Day: 6.8 Hours

Environment

Temp: -216 °C

Axial Tilt: 26.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 55,986,468 km

• M1: 205,996 km (0.118 R)
• M2: 303,534 km (0.076 R)
• M3: 408,253 km (0.085 R)
• M4: 603,927 km (0.058 R)
• M5: 1,055,862 km (0.113 R)
• M6: 1,195,287 km (0.112 R)
• M7: 1,447,060 km (0.064 R)
• M8: 1,849,478 km (0.073 R)
• M9: 2,020,319 km (0.052 R)
• M10: 2,471,058 km (0.053 R)
• M11: 2,603,003 km (0.048 R)
• M12: 3,465,285 km (0.118 R)
• M13: 3,721,097 km (0.077 R)
• M14: 3,807,715 km (0.096 R)
• M15: 4,296,600 km (0.069 R)
• M16: 4,664,910 km (0.067 R)
• M17: 5,067,478 km (0.105 R)
• M18: 5,163,819 km (0.082 R)
• M19: 5,285,143 km (0.065 R)
• M20: 5,481,416 km (0.12 R)
• M21: 5,580,300 km (0.075 R)
• M22: 5,730,047 km (0.07 R)
• M23: 6,841,410 km (0.082 R)
• M24: 7,299,030 km (0.083 R)
• M25: 7,822,473 km (0.036 R)
• M26: 8,074,695 km (0.077 R)
• M27: 8,215,915 km (0.061 R)
• M28: 8,329,460 km (0.096 R)
• M29: 8,615,940 km (0.103 R)
• M30: 8,818,346 km (0.118 R)
• M31: 9,524,298 km (0.065 R)
• M32: 9,914,300 km (0.109 R)
• M33: 10,187,316 km (0.047 R)
• M34: 10,679,044 km (0.06 R)
• M35: 10,990,357 km (0.089 R)
• M36: 12,038,739 km (0.112 R)
• M37: 12,200,454 km (0.118 R)
• M38: 12,395,380 km (0.036 R)
• M39: 12,591,354 km (0.044 R)
• M40: 13,085,775 km (0.037 R)
• M41: 13,185,556 km (0.111 R)
• M42: 13,586,778 km (0.08 R)
• M43: 13,822,694 km (0.061 R)
• M44: 14,128,023 km (0.101 R)
• M45: 14,298,564 km (0.073 R)
• M46: 15,301,469 km (0.104 R)
• M47: 15,476,648 km (0.083 R)
• M48: 15,758,490 km (0.093 R)
• M49: 16,041,978 km (0.094 R)
• M50: 16,902,465 km (0.069 R)
• M51: 17,777,912 km (0.095 R)
• M52: 19,307,700 km (0.082 R)
• M53: 19,839,670 km (0.1 R)
• M54: 20,376,576 km (0.093 R)
• M55: 20,530,812 km (0.103 R)
• M56: 20,762,838 km (0.052 R)
• M57: 21,112,747 km (0.057 R)
• M58: 21,464,602 km (0.081 R)
• M59: 21,936,583 km (0.078 R)
• M60: 22,055,214 km (0.101 R)
• M61: 23,091,628 km (0.051 R)
• M62: 23,737,293 km (0.044 R)
• M63: 24,184,740 km (0.037 R)
• M64: 24,922,856 km (0.102 R)
• M65: 25,046,573 km (0.074 R)
• M66: 26,379,191 km (0.107 R)
• M67: 27,181,335 km (0.075 R)
• M68: 27,266,157 km (0.106 R)
• M69: 27,564,156 km (0.078 R)
• M70: 28,120,061 km (0.113 R)
• M71: 28,507,221 km (0.102 R)
• M72: 28,939,409 km (0.091 R)
• M73: 29,069,559 km (0.115 R)

Planet 8 - Ice Giant

Semi-Major Axis: 6.47 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 936.5

Radius: 5.7

Gravity: 28.82 G

Time & Orbit

Eccentricity (e): 0.039

Orbit Range: 6.22 AU - 6.72 AU

Year: 10796 Days

Day: 20.7 Hours

Environment

Temp: -222 °C

Axial Tilt: 21 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 55,986,468 km

• M1: 163,510 km (0.082 R)
• M2: 278,850 km (0.099 R)
• M3: 376,089 km (0.105 R)
• M4: 485,146 km (0.083 R)
• M5: 934,089 km (0.093 R)
• M6: 1,288,935 km (0.046 R)
• M7: 1,505,703 km (0.1 R)
• M8: 1,682,378 km (0.103 R)
• M9: 2,223,174 km (0.09 R)
• M10: 3,094,582 km (0.115 R)
• M11: 3,319,278 km (0.079 R)
• M12: 4,448,293 km (0.115 R)
• M13: 5,413,498 km (0.119 R)
• M14: 6,118,254 km (0.119 R)
• M15: 6,481,477 km (0.059 R)
• M16: 7,228,719 km (0.087 R)
• M17: 7,612,587 km (0.088 R)
• M18: 7,959,205 km (0.119 R)
• M19: 8,893,743 km (0.102 R)
• M20: 9,167,058 km (0.086 R)
• M21: 10,864,097 km (0.11 R)
• M22: 11,254,248 km (0.054 R)
• M23: 11,450,969 km (0.101 R)
• M24: 11,500,336 km (0.03 R)
• M25: 11,998,048 km (0.065 R)
• M26: 12,148,693 km (0.109 R)
• M27: 13,952,096 km (0.033 R)
• M28: 14,804,056 km (0.091 R)
• M29: 16,168,538 km (0.061 R)
• M30: 16,279,390 km (0.036 R)
• M31: 17,006,436 km (0.1 R)
• M32: 17,345,424 km (0.1 R)
• M33: 17,629,660 km (0.106 R)
• M34: 17,858,246 km (0.111 R)
• M35: 18,202,919 km (0.103 R)
• M36: 19,426,331 km (0.119 R)
• M37: 19,721,487 km (0.043 R)
• M38: 20,196,909 km (0.042 R)
• M39: 20,917,073 km (0.119 R)
• M40: 21,037,949 km (0.109 R)
• M41: 21,098,536 km (0.107 R)
• M42: 21,219,710 km (0.036 R)
• M43: 22,940,534 km (0.1 R)
• M44: 23,127,532 km (0.092 R)
• M45: 24,833,546 km (0.033 R)
• M46: 25,733,975 km (0.056 R)
• M47: 27,500,427 km (0.104 R)
• M48: 27,632,821 km (0.071 R)
• M49: 29,305,624 km (0.097 R)
• M50: 29,576,397 km (0.114 R)
• M51: 29,915,834 km (0.058 R)
• M52: 29,983,901 km (0.103 R)
• M53: 30,052,118 km (0.044 R)
• M54: 30,120,185 km (0.026 R)
• M55: 32,608,297 km (0.058 R)
• M56: 32,678,308 km (0.098 R)
• M57: 32,748,320 km (0.115 R)
• M58: 32,888,643 km (0.1 R)
• M59: 33,099,576 km (0.119 R)
• M60: 33,310,958 km (0.102 R)
• M61: 33,664,158 km (0.068 R)
• M62: 34,445,658 km (0.032 R)
• M63: 34,588,374 km (0.053 R)
• M64: 34,946,063 km (0.079 R)
• M65: 35,593,073 km (0.098 R)
• M66: 36,026,608 km (0.071 R)
• M67: 36,316,529 km (0.113 R)
• M68: 36,825,760 km (0.104 R)
• M69: 38,146,260 km (0.086 R)
• M70: 38,664,018 km (0.119 R)
• M71: 39,556,819 km (0.104 R)
• M72: 39,631,618 km (0.07 R)
• M73: 42,658,431 km (0.105 R)
• M74: 43,195,637 km (0.11 R)
• M75: 43,967,113 km (0.089 R)
• M76: 44,743,078 km (0.108 R)
• M77: 45,523,679 km (0.119 R)
• M78: 46,387,457 km (0.099 R)
• M79: 46,702,810 km (0.115 R)
• M80: 47,177,334 km (0.052 R)
• M81: 48,051,285 km (0.053 R)
• M82: 48,290,641 km (0.077 R)
• M83: 48,530,297 km (0.108 R)
• M84: 49,171,474 km (0.106 R)
• M85: 49,332,142 km (0.088 R)
• M86: 50,543,137 km (0.094 R)
• M87: 52,009,196 km (0.093 R)
• M88: 52,994,298 km (0.076 R)
• M89: 53,489,167 km (0.086 R)
• M90: 53,819,928 km (0.036 R)
• M91: 54,483,545 km (0.079 R)
• M92: 55,484,055 km (0.032 R)

Kuiper Belt

Range: 30 - 48 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 445 - 13,309 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit