🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 1.04 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.32

Radius: 1.8

Gravity: 1.33 G

Time & Orbit

Eccentricity (e): 0.226

Orbit Range: 0.8 AU - 1.28 AU

Year: 488 Days

Day: 35.7 Hours

Environment

Temp: -73 °C

Axial Tilt: 6.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (2)

Outer Limit: 28,486,769 km

• M1: 876,644 km (0.104 R)
• M2: 912,397 km (0.104 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1.49 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.54

Radius: 0.78

Gravity: 0.89 G

Time & Orbit

Eccentricity (e): 0.148

Orbit Range: 1.27 AU - 1.71 AU

Year: 837 Days

Day: 27.5 Hours

Environment

Temp: -113 °C

Axial Tilt: 162.2 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 28,486,769 km

• M1: 53,556 km (0.109 R)

Planet 3 - Terrestrial

Semi-Major Axis: 1.73 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.01

Radius: 1.55

Gravity: 1.25 G

Time & Orbit

Eccentricity (e): 0.037

Orbit Range: 1.67 AU - 1.79 AU

Year: 1047 Days

Day: 47.3 Hours

Environment

Temp: -115 °C

Axial Tilt: 18.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Gas Giant

Semi-Major Axis: 2.97 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 34.5

Radius: 9.8

Gravity: 0.36 G

Time & Orbit

Eccentricity (e): 0.201

Orbit Range: 2.37 AU - 3.57 AU

Year: 2355 Days

Day: 7.7 Hours

Environment

Temp: -154 °C

Axial Tilt: 28.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (44)

Outer Limit: 28,486,769 km

• M1: 123,568 km (0.118 R)
• M2: 242,049 km (0.06 R)
• M3: 319,092 km (0.097 R)
• M4: 387,159 km (0.069 R)
• M5: 518,656 km (0.097 R)
• M6: 688,300 km (0.087 R)
• M7: 773,571 km (0.119 R)
• M8: 838,795 km (0.096 R)
• M9: 901,327 km (0.073 R)
• M10: 970,441 km (0.104 R)
• M11: 1,114,654 km (0.094 R)
• M12: 1,184,067 km (0.076 R)
• M13: 1,277,117 km (0.118 R)
• M14: 1,436,140 km (0.114 R)
• M15: 1,619,995 km (0.119 R)
• M16: 1,711,699 km (0.045 R)
• M17: 1,773,932 km (0.106 R)
• M18: 1,843,195 km (0.102 R)
• M19: 2,326,546 km (0.068 R)
• M20: 2,543,463 km (0.103 R)
• M21: 2,622,002 km (0.084 R)
• M22: 3,080,519 km (0.103 R)
• M23: 3,172,073 km (0.109 R)
• M24: 3,233,708 km (0.106 R)
• M25: 3,373,881 km (0.08 R)
• M26: 3,555,941 km (0.048 R)
• M27: 3,660,211 km (0.089 R)
• M28: 3,741,293 km (0.079 R)
• M29: 3,855,586 km (0.085 R)
• M30: 3,971,225 km (0.081 R)
• M31: 4,037,796 km (0.098 R)
• M32: 4,155,081 km (0.04 R)
• M33: 4,282,239 km (0.106 R)
• M34: 4,531,469 km (0.115 R)
• M35: 4,679,870 km (0.093 R)
• M36: 4,750,331 km (0.083 R)
• M37: 4,865,372 km (0.057 R)
• M38: 5,180,125 km (0.114 R)
• M39: 5,298,607 km (0.029 R)
• M40: 5,585,087 km (0.101 R)
• M41: 5,848,230 km (0.076 R)
• M42: 6,154,008 km (0.105 R)
• M43: 6,279,670 km (0.113 R)
• M44: 6,642,145 km (0.106 R)

Planet 5 - Gas Giant

Semi-Major Axis: 3.18 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 715.3

Radius: 8.7

Gravity: 9.45 G

Time & Orbit

Eccentricity (e): 0.071

Orbit Range: 2.95 AU - 3.41 AU

Year: 2610 Days

Day: 6 Hours

Environment

Temp: -168 °C

Axial Tilt: 21.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 28,486,769 km

• M1: 117,434 km (0.073 R)
• M2: 186,249 km (0.11 R)
• M3: 296,653 km (0.11 R)
• M4: 405,709 km (0.046 R)
• M5: 650,302 km (0.079 R)
• M6: 732,730 km (0.09 R)
• M7: 799,451 km (0.055 R)
• M8: 949,797 km (0.101 R)
• M9: 1,066,184 km (0.083 R)
• M10: 1,209,948 km (0.1 R)
• M11: 1,325,138 km (0.084 R)
• M12: 1,718,132 km (0.062 R)
• M13: 1,941,332 km (0.079 R)
• M14: 2,104,692 km (0.067 R)
• M15: 2,202,081 km (0.11 R)
• M16: 2,329,388 km (0.117 R)
• M17: 2,430,367 km (0.086 R)
• M18: 2,711,461 km (0.1 R)
• M19: 3,018,735 km (0.071 R)
• M20: 3,500,590 km (0.101 R)
• M21: 3,971,973 km (0.06 R)
• M22: 4,481,354 km (0.028 R)
• M23: 4,553,161 km (0.06 R)
• M24: 4,607,315 km (0.03 R)
• M25: 4,679,870 km (0.084 R)
• M26: 4,899,929 km (0.067 R)
• M27: 5,369,217 km (0.052 R)
• M28: 5,715,985 km (0.062 R)
• M29: 6,269,946 km (0.064 R)
• M30: 6,431,362 km (0.116 R)
• M31: 6,799,672 km (0.111 R)
• M32: 6,944,782 km (0.09 R)
• M33: 7,259,087 km (0.067 R)
• M34: 7,621,114 km (0.076 R)
• M35: 7,945,293 km (0.055 R)
• M36: 8,120,172 km (0.088 R)
• M37: 8,318,390 km (0.061 R)
• M38: 8,406,952 km (0.079 R)
• M39: 8,629,852 km (0.094 R)
• M40: 8,809,519 km (0.041 R)
• M41: 9,264,297 km (0.081 R)
• M42: 9,425,264 km (0.102 R)
• M43: 9,633,504 km (0.048 R)
• M44: 10,196,441 km (0.054 R)
• M45: 10,338,858 km (0.077 R)
• M46: 10,770,149 km (0.105 R)
• M47: 10,842,554 km (0.12 R)
• M48: 11,625,550 km (0.044 R)
• M49: 11,699,750 km (0.05 R)
• M50: 11,774,250 km (0.052 R)
• M51: 12,199,407 km (0.1 R)
• M52: 12,401,215 km (0.067 R)
• M53: 12,502,492 km (0.084 R)
• M54: 12,655,082 km (0.117 R)
• M55: 13,090,412 km (0.108 R)
• M56: 13,245,246 km (0.093 R)
• M57: 13,870,864 km (0.108 R)
• M58: 13,976,031 km (0.111 R)
• M59: 14,081,498 km (0.091 R)
• M60: 14,452,650 km (0.089 R)
• M61: 14,559,314 km (0.059 R)
• M62: 14,880,799 km (0.107 R)
• M63: 14,961,582 km (0.067 R)
• M64: 15,069,442 km (0.042 R)
• M65: 15,286,060 km (0.101 R)
• M66: 15,503,575 km (0.112 R)
• M67: 15,914,371 km (0.115 R)
• M68: 16,024,625 km (0.111 R)
• M69: 16,495,559 km (0.096 R)
• M70: 16,746,734 km (0.106 R)
• M71: 16,914,882 km (0.027 R)
• M72: 17,309,371 km (0.089 R)
• M73: 17,394,343 km (0.118 R)
• M74: 17,650,006 km (0.105 R)
• M75: 18,337,857 km (0.115 R)
• M76: 18,598,157 km (0.087 R)
• M77: 18,714,095 km (0.068 R)
• M78: 18,859,504 km (0.11 R)
• M79: 19,210,012 km (0.113 R)
• M80: 19,562,614 km (0.071 R)
• M81: 19,680,647 km (0.109 R)
• M82: 19,739,888 km (0.117 R)
• M83: 19,858,220 km (0.032 R)

Planet 6 - Gas Giant

Semi-Major Axis: 3.96 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 308.2

Radius: 11.4

Gravity: 2.37 G

Time & Orbit

Eccentricity (e): 0.145

Orbit Range: 3.39 AU - 4.53 AU

Year: 3626 Days

Day: 8.7 Hours

Environment

Temp: -167 °C

Axial Tilt: 2.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (64)

Outer Limit: 28,486,769 km

• M1: 157,527 km (0.103 R)
• M2: 242,947 km (0.105 R)
• M3: 336,745 km (0.071 R)
• M4: 522,545 km (0.034 R)
• M5: 818,001 km (0.061 R)
• M6: 902,674 km (0.118 R)
• M7: 1,061,247 km (0.094 R)
• M8: 1,339,200 km (0.075 R)
• M9: 1,487,152 km (0.101 R)
• M10: 1,580,950 km (0.077 R)
• M11: 1,725,611 km (0.064 R)
• M12: 2,054,428 km (0.1 R)
• M13: 2,307,547 km (0.104 R)
• M14: 2,417,202 km (0.044 R)
• M15: 2,556,777 km (0.04 R)
• M16: 2,727,917 km (0.093 R)
• M17: 2,902,797 km (0.109 R)
• M18: 3,111,636 km (0.112 R)
• M19: 3,187,482 km (0.077 R)
• M20: 3,294,744 km (0.04 R)
• M21: 3,497,149 km (0.082 R)
• M22: 3,768,071 km (0.112 R)
• M23: 3,881,616 km (0.083 R)
• M24: 3,963,446 km (0.101 R)
• M25: 4,078,936 km (0.119 R)
• M26: 4,778,306 km (0.102 R)
• M27: 5,169,055 km (0.063 R)
• M28: 6,793,688 km (0.107 R)
• M29: 6,952,411 km (0.115 R)
• M30: 7,374,876 km (0.101 R)
• M31: 7,517,592 km (0.102 R)
• M32: 7,826,512 km (0.088 R)
• M33: 7,951,127 km (0.086 R)
• M34: 8,244,787 km (0.118 R)
• M35: 8,414,132 km (0.117 R)
• M36: 8,627,608 km (0.075 R)
• M37: 8,756,412 km (0.12 R)
• M38: 9,344,481 km (0.062 R)
• M39: 9,587,728 km (0.064 R)
• M40: 9,699,028 km (0.076 R)
• M41: 9,900,387 km (0.107 R)
• M42: 10,535,580 km (0.054 R)
• M43: 10,650,471 km (0.108 R)
• M44: 10,858,262 km (0.074 R)
• M45: 11,277,884 km (0.064 R)
• M46: 11,702,892 km (0.043 R)
• M47: 12,084,965 km (0.119 R)
• M48: 12,592,850 km (0.058 R)
• M49: 12,666,003 km (0.059 R)
• M50: 12,959,813 km (0.098 R)
• M51: 13,256,017 km (0.111 R)
• M52: 13,429,850 km (0.111 R)
• M53: 14,310,233 km (0.106 R)
• M54: 14,437,541 km (0.119 R)
• M55: 15,235,197 km (0.075 R)
• M56: 15,339,167 km (0.044 R)
• M57: 15,521,677 km (0.111 R)
• M58: 15,652,575 km (0.037 R)
• M59: 15,731,263 km (0.085 R)
• M60: 16,953,927 km (0.083 R)
• M61: 17,467,795 km (0.053 R)
• M62: 17,849,868 km (0.031 R)
• M63: 17,959,524 km (0.115 R)
• M64: 18,124,380 km (0.106 R)

Planet 7 - Gas Giant

Semi-Major Axis: 4.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 479.6

Radius: 14.6

Gravity: 2.25 G

Time & Orbit

Eccentricity (e): 0.013

Orbit Range: 4.27 AU - 4.39 AU

Year: 4146 Days

Day: 12.6 Hours

Environment

Temp: -175 °C

Axial Tilt: 38.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (63)

Outer Limit: 28,486,769 km

• M1: 212,429 km (0.098 R)
• M2: 369,507 km (0.115 R)
• M3: 509,680 km (0.088 R)
• M4: 773,870 km (0.104 R)
• M5: 946,655 km (0.08 R)
• M6: 1,050,027 km (0.093 R)
• M7: 1,333,515 km (0.092 R)
• M8: 1,505,254 km (0.103 R)
• M9: 2,473,900 km (0.045 R)
• M10: 2,925,536 km (0.094 R)
• M11: 3,082,015 km (0.058 R)
• M12: 3,223,535 km (0.118 R)
• M13: 3,349,048 km (0.112 R)
• M14: 3,717,208 km (0.042 R)
• M15: 3,811,305 km (0.073 R)
• M16: 3,944,447 km (0.063 R)
• M17: 4,432,735 km (0.083 R)
• M18: 4,653,840 km (0.047 R)
• M19: 5,044,440 km (0.095 R)
• M20: 5,191,046 km (0.059 R)
• M21: 5,381,634 km (0.055 R)
• M22: 5,531,531 km (0.089 R)
• M23: 5,726,307 km (0.097 R)
• M24: 6,528,301 km (0.083 R)
• M25: 6,711,409 km (0.114 R)
• M26: 6,989,213 km (0.057 R)
• M27: 7,294,542 km (0.096 R)
• M28: 7,532,402 km (0.115 R)
• M29: 7,918,365 km (0.119 R)
• M30: 8,015,903 km (0.1 R)
• M31: 9,217,473 km (0.104 R)
• M32: 9,474,781 km (0.077 R)
• M33: 9,760,812 km (0.106 R)
• M34: 10,049,536 km (0.081 R)
• M35: 10,421,287 km (0.089 R)
• M36: 11,096,272 km (0.115 R)
• M37: 11,205,629 km (0.096 R)
• M38: 12,318,637 km (0.064 R)
• M39: 12,517,153 km (0.071 R)
• M40: 12,773,713 km (0.119 R)
• M41: 13,641,979 km (0.118 R)
• M42: 13,847,377 km (0.089 R)
• M43: 13,965,111 km (0.104 R)
• M44: 14,231,545 km (0.068 R)
• M45: 14,469,555 km (0.108 R)
• M46: 14,619,153 km (0.087 R)
• M47: 14,859,407 km (0.115 R)
• M48: 15,040,420 km (0.117 R)
• M49: 15,343,954 km (0.104 R)
• M50: 15,895,223 km (0.066 R)
• M51: 16,609,253 km (0.112 R)
• M52: 17,397,185 km (0.112 R)
• M53: 19,239,034 km (0.096 R)
• M54: 19,634,721 km (0.093 R)
• M55: 19,734,054 km (0.062 R)
• M56: 19,833,536 km (0.106 R)
• M57: 20,266,622 km (0.035 R)
• M58: 20,568,361 km (0.097 R)
• M59: 20,871,446 km (0.098 R)
• M60: 22,271,383 km (0.047 R)
• M61: 22,791,236 km (0.086 R)
• M62: 23,035,080 km (0.079 R)
• M63: 23,560,767 km (0.106 R)

Planet 8 - Gas Giant

Semi-Major Axis: 5.13 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 699.1

Radius: 8.3

Gravity: 10.15 G

Time & Orbit

Eccentricity (e): 0.035

Orbit Range: 4.95 AU - 5.31 AU

Year: 5347 Days

Day: 12.3 Hours

Environment

Temp: -186 °C

Axial Tilt: 11.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (85)

Outer Limit: 28,486,769 km

• M1: 161,416 km (0.06 R)
• M2: 319,691 km (0.037 R)
• M3: 395,686 km (0.074 R)
• M4: 500,854 km (0.076 R)
• M5: 652,845 km (0.106 R)
• M6: 902,374 km (0.07 R)
• M7: 1,165,966 km (0.11 R)
• M8: 1,259,315 km (0.071 R)
• M9: 1,420,432 km (0.052 R)
• M10: 2,055,774 km (0.087 R)
• M11: 2,265,809 km (0.094 R)
• M12: 2,442,933 km (0.074 R)
• M13: 2,563,659 km (0.068 R)
• M14: 2,686,329 km (0.107 R)
• M15: 2,790,000 km (0.1 R)
• M16: 2,873,925 km (0.031 R)
• M17: 3,350,843 km (0.091 R)
• M18: 3,782,582 km (0.061 R)
• M19: 3,899,119 km (0.099 R)
• M20: 3,969,579 km (0.064 R)
• M21: 4,088,061 km (0.113 R)
• M22: 4,352,849 km (0.112 R)
• M23: 4,426,003 km (0.118 R)
• M24: 5,232,186 km (0.108 R)
• M25: 5,572,670 km (0.09 R)
• M26: 5,732,291 km (0.109 R)
• M27: 5,974,341 km (0.059 R)
• M28: 6,165,078 km (0.066 R)
• M29: 6,720,984 km (0.091 R)
• M30: 7,033,643 km (0.03 R)
• M31: 7,351,090 km (0.097 R)
• M32: 7,673,174 km (0.094 R)
• M33: 7,732,265 km (0.079 R)
• M34: 7,791,506 km (0.074 R)
• M35: 8,089,804 km (0.104 R)
• M36: 8,210,230 km (0.076 R)
• M37: 8,300,887 km (0.078 R)
• M38: 8,422,360 km (0.08 R)
• M39: 8,666,953 km (0.034 R)
• M40: 8,976,171 km (0.113 R)
• M41: 9,194,734 km (0.065 R)
• M42: 9,288,981 km (0.104 R)
• M43: 9,509,937 km (0.09 R)
• M44: 9,828,879 km (0.039 R)
• M45: 10,608,434 km (0.078 R)
• M46: 11,038,976 km (0.078 R)
• M47: 11,509,013 km (0.05 R)
• M48: 11,985,632 km (0.025 R)
• M49: 12,468,833 km (0.081 R)
• M50: 13,347,272 km (0.115 R)
• M51: 13,453,935 km (0.057 R)
• M52: 13,596,801 km (0.097 R)
• M53: 15,274,691 km (0.031 R)
• M54: 15,573,138 km (0.069 R)
• M55: 15,911,230 km (0.097 R)
• M56: 15,986,627 km (0.072 R)
• M57: 16,251,714 km (0.114 R)
• M58: 16,671,187 km (0.05 R)
• M59: 17,950,697 km (0.114 R)
• M60: 18,068,580 km (0.085 R)
• M61: 18,542,806 km (0.105 R)
• M62: 18,622,242 km (0.087 R)
• M63: 20,152,628 km (0.09 R)
• M64: 20,316,139 km (0.099 R)
• M65: 21,015,658 km (0.102 R)
• M66: 21,306,028 km (0.111 R)
• M67: 21,389,204 km (0.06 R)
• M68: 21,639,482 km (0.113 R)
• M69: 22,311,625 km (0.108 R)
• M70: 22,862,743 km (0.118 R)
• M71: 24,281,829 km (0.082 R)
• M72: 25,287,725 km (0.052 R)
• M73: 25,552,364 km (0.085 R)
• M74: 25,817,900 km (0.1 R)
• M75: 26,217,924 km (0.058 R)
• M76: 27,656,906 km (0.071 R)
• M77: 28,248,716 km (0.066 R)
• M78: 28,340,120 km (0.099 R)
• M79: 28,982,942 km (0.051 R)
• M80: 29,676,926 km (0.074 R)
• M81: 29,769,976 km (0.092 R)
• M82: 29,909,551 km (0.095 R)
• M83: 30,142,625 km (0.077 R)
• M84: 30,704,813 km (0.092 R)
• M85: 31,317,566 km (0.086 R)

Planet 9 - Gas Giant

Semi-Major Axis: 5.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 380.5

Radius: 12.2

Gravity: 2.56 G

Time & Orbit

Eccentricity (e): 0.026

Orbit Range: 5.48 AU - 5.78 AU

Year: 6147 Days

Day: 12.4 Hours

Environment

Temp: -183 °C

Axial Tilt: 6.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (58)

Outer Limit: 28,486,769 km

• M1: 277,504 km (0.108 R)
• M2: 395,686 km (0.044 R)
• M3: 517,160 km (0.117 R)
• M4: 599,738 km (0.113 R)
• M5: 722,109 km (0.107 R)
• M6: 1,781,411 km (0.079 R)
• M7: 2,388,180 km (0.097 R)
• M8: 2,648,182 km (0.108 R)
• M9: 2,839,667 km (0.098 R)
• M10: 2,956,802 km (0.083 R)
• M11: 3,135,571 km (0.067 R)
• M12: 3,256,895 km (0.043 R)
• M13: 3,524,975 km (0.09 R)
• M14: 3,672,329 km (0.071 R)
• M15: 3,886,553 km (0.108 R)
• M16: 4,531,170 km (0.066 R)
• M17: 4,622,724 km (0.118 R)
• M18: 4,807,627 km (0.034 R)
• M19: 5,185,062 km (0.119 R)
• M20: 5,329,125 km (0.086 R)
• M21: 5,695,041 km (0.117 R)
• M22: 6,841,559 km (0.046 R)
• M23: 6,947,026 km (0.041 R)
• M24: 7,373,829 km (0.12 R)
• M25: 7,617,673 km (0.115 R)
• M26: 8,905,561 km (0.037 R)
• M27: 10,807,399 km (0.063 R)
• M28: 10,899,551 km (0.082 R)
• M29: 11,614,928 km (0.088 R)
• M30: 11,930,729 km (0.065 R)
• M31: 12,185,345 km (0.087 R)
• M32: 12,409,742 km (0.098 R)
• M33: 12,732,574 km (0.101 R)
• M34: 13,784,247 km (0.106 R)
• M35: 14,152,258 km (0.086 R)
• M36: 14,421,833 km (0.043 R)
• M37: 15,103,551 km (0.072 R)
• M38: 15,726,027 km (0.106 R)
• M39: 16,356,882 km (0.112 R)
• M40: 16,817,643 km (0.11 R)
• M41: 17,860,939 km (0.06 R)
• M42: 18,629,572 km (0.108 R)
• M43: 19,222,429 km (0.117 R)
• M44: 19,859,117 km (0.064 R)
• M45: 20,161,155 km (0.06 R)
• M46: 21,153,139 km (0.068 R)
• M47: 21,307,225 km (0.079 R)
• M48: 22,161,129 km (0.087 R)
• M49: 22,749,797 km (0.081 R)
• M50: 23,942,541 km (0.108 R)
• M51: 24,708,482 km (0.1 R)
• M52: 24,951,878 km (0.043 R)
• M53: 25,728,440 km (0.104 R)
• M54: 26,845,487 km (0.109 R)
• M55: 27,095,765 km (0.086 R)
• M56: 27,221,277 km (0.116 R)
• M57: 27,767,310 km (0.09 R)
• M58: 28,105,102 km (0.101 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: 342 - 15,151 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit