🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.27 AU

Composition

Type: Inner System (Rocky)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 905.3

Radius: 12.3

Gravity: 5.98 G

Time & Orbit

Eccentricity (e): 0.249

Orbit Range: 0.41 AU - 0.67 AU

Year: 279 Days

Day: 9.2 Hours

Environment

Temp: -145 °C

Axial Tilt: 21.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (39)

Outer Limit: 80,975,587 km

• M1: 161,566 km (0.096 R)
• M2: 249,230 km (0.118 R)
• M3: 380,278 km (0.094 R)
• M4: 461,210 km (0.098 R)
• M5: 610,210 km (0.118 R)
• M6: 703,858 km (0.037 R)
• M7: 911,350 km (0.108 R)
• M8: 1,021,005 km (0.094 R)
• M9: 1,164,919 km (0.085 R)
• M10: 1,355,955 km (0.113 R)
• M11: 1,460,225 km (0.085 R)
• M12: 1,539,063 km (0.068 R)
• M13: 1,657,694 km (0.053 R)
• M14: 1,799,513 km (0.059 R)
• M15: 1,914,853 km (0.11 R)
• M16: 2,001,769 km (0.079 R)
• M17: 2,079,560 km (0.045 R)
• M18: 2,158,548 km (0.101 R)
• M19: 2,243,818 km (0.115 R)
• M20: 2,352,127 km (0.086 R)
• M21: 2,440,091 km (0.091 R)
• M22: 2,529,251 km (0.035 R)
• M23: 2,642,198 km (0.115 R)
• M24: 2,873,326 km (0.101 R)
• M25: 3,039,081 km (0.12 R)
• M26: 3,153,523 km (0.086 R)
• M27: 3,287,712 km (0.058 R)
• M28: 3,448,829 km (0.113 R)
• M29: 3,530,510 km (0.059 R)
• M30: 3,650,936 km (0.088 R)
• M31: 3,734,112 km (0.032 R)
• M32: 3,837,485 km (0.051 R)
• M33: 3,935,172 km (0.117 R)
• M34: 4,027,175 km (0.073 R)
• M35: 4,146,404 km (0.1 R)
• M36: 4,368,407 km (0.107 R)
• M37: 4,450,088 km (0.039 R)
• M38: 4,628,708 km (0.087 R)
• M39: 4,823,933 km (0.083 R)

Planet 2 - Gas Giant

Semi-Major Axis: 2.61 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 471.3

Radius: 11.4

Gravity: 3.63 G

Time & Orbit

Eccentricity (e): 0.229

Orbit Range: 2.01 AU - 3.21 AU

Year: 2964 Days

Day: 7.7 Hours

Environment

Temp: -212 °C

Axial Tilt: 20.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (68)

Outer Limit: 80,975,587 km

• M1: 155,133 km (0.117 R)
• M2: 238,758 km (0.053 R)
• M3: 314,156 km (0.106 R)
• M4: 487,539 km (0.098 R)
• M5: 679,773 km (0.081 R)
• M6: 813,663 km (0.054 R)
• M7: 966,851 km (0.049 R)
• M8: 1,130,212 km (0.09 R)
• M9: 1,438,832 km (0.098 R)
• M10: 1,736,981 km (0.115 R)
• M11: 1,824,196 km (0.08 R)
• M12: 1,925,624 km (0.106 R)
• M13: 2,028,996 km (0.103 R)
• M14: 2,134,313 km (0.099 R)
• M15: 2,268,652 km (0.108 R)
• M16: 2,391,920 km (0.105 R)
• M17: 2,574,131 km (0.03 R)
• M18: 3,057,332 km (0.102 R)
• M19: 3,333,041 km (0.077 R)
• M20: 3,941,455 km (0.09 R)
• M21: 4,024,033 km (0.096 R)
• M22: 4,275,657 km (0.096 R)
• M23: 4,411,791 km (0.079 R)
• M24: 4,811,816 km (0.11 R)
• M25: 4,971,436 km (0.112 R)
• M26: 5,078,848 km (0.103 R)
• M27: 5,369,217 km (0.111 R)
• M28: 5,609,322 km (0.109 R)
• M29: 5,702,521 km (0.084 R)
• M30: 6,004,410 km (0.088 R)
• M31: 6,080,705 km (0.104 R)
• M32: 6,292,236 km (0.091 R)
• M33: 6,389,175 km (0.059 R)
• M34: 6,961,387 km (0.116 R)
• M35: 7,102,009 km (0.117 R)
• M36: 7,529,560 km (0.096 R)
• M37: 7,653,277 km (0.114 R)
• M38: 7,736,005 km (0.116 R)
• M39: 7,881,713 km (0.114 R)
• M40: 8,133,786 km (0.069 R)
• M41: 8,473,822 km (0.057 R)
• M42: 8,948,945 km (0.066 R)
• M43: 9,344,332 km (0.11 R)
• M44: 9,902,781 km (0.084 R)
• M45: 10,061,205 km (0.083 R)
• M46: 10,610,528 km (0.108 R)
• M47: 10,726,167 km (0.072 R)
• M48: 11,193,062 km (0.114 R)
• M49: 11,310,796 km (0.105 R)
• M50: 11,618,967 km (0.095 R)
• M51: 11,810,004 km (0.105 R)
• M52: 12,292,158 km (0.075 R)
• M53: 12,535,703 km (0.101 R)
• M54: 12,633,540 km (0.074 R)
• M55: 12,706,993 km (0.04 R)
• M56: 12,977,914 km (0.098 R)
• M57: 13,151,298 km (0.069 R)
• M58: 13,701,370 km (0.082 R)
• M59: 13,877,895 km (0.038 R)
• M60: 14,182,477 km (0.098 R)
• M61: 14,953,354 km (0.095 R)
• M62: 15,083,205 km (0.096 R)
• M63: 15,239,385 km (0.113 R)
• M64: 15,606,199 km (0.056 R)
• M65: 15,869,941 km (0.083 R)
• M66: 17,020,797 km (0.115 R)
• M67: 17,757,118 km (0.072 R)
• M68: 18,503,910 km (0.11 R)

Planet 3 - Gas Giant

Semi-Major Axis: 3.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 733.3

Radius: 8.6

Gravity: 9.91 G

Time & Orbit

Eccentricity (e): 0.197

Orbit Range: 2.87 AU - 4.29 AU

Year: 4761 Days

Day: 8.5 Hours

Environment

Temp: -216 °C

Axial Tilt: 55.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 80,975,587 km

• M1: 151,094 km (0.076 R)
• M2: 217,665 km (0.067 R)
• M3: 277,504 km (0.075 R)
• M4: 430,094 km (0.077 R)
• M5: 566,826 km (0.112 R)
• M6: 658,679 km (0.036 R)
• M7: 1,077,404 km (0.093 R)
• M8: 1,193,791 km (0.061 R)
• M9: 1,268,740 km (0.069 R)
• M10: 1,701,077 km (0.055 R)
• M11: 1,924,876 km (0.094 R)
• M12: 1,995,785 km (0.112 R)
• M13: 2,158,398 km (0.081 R)
• M14: 2,516,087 km (0.103 R)
• M15: 2,672,267 km (0.116 R)
• M16: 2,811,692 km (0.119 R)
• M17: 3,035,640 km (0.106 R)
• M18: 3,139,311 km (0.119 R)
• M19: 3,393,179 km (0.083 R)
• M20: 3,479,198 km (0.036 R)
• M21: 3,544,273 km (0.094 R)
• M22: 3,631,638 km (0.091 R)
• M23: 3,741,892 km (0.083 R)
• M24: 3,830,902 km (0.094 R)
• M25: 3,943,250 km (0.099 R)
• M26: 4,263,390 km (0.078 R)
• M27: 4,403,264 km (0.064 R)
• M28: 5,026,788 km (0.059 R)
• M29: 5,249,090 km (0.097 R)
• M30: 5,449,402 km (0.119 R)
• M31: 5,601,243 km (0.102 R)
• M32: 5,677,688 km (0.04 R)
• M33: 5,935,296 km (0.12 R)
• M34: 6,461,730 km (0.078 R)
• M35: 6,595,621 km (0.088 R)
• M36: 6,975,749 km (0.082 R)
• M37: 7,140,755 km (0.106 R)
• M38: 7,223,782 km (0.066 R)
• M39: 7,842,369 km (0.042 R)
• M40: 7,928,089 km (0.114 R)
• M41: 8,158,170 km (0.062 R)
• M42: 8,244,937 km (0.092 R)
• M43: 8,713,328 km (0.118 R)
• M44: 8,920,970 km (0.104 R)
• M45: 9,070,268 km (0.111 R)
• M46: 9,523,101 km (0.076 R)
• M47: 9,645,173 km (0.098 R)
• M48: 9,767,694 km (0.045 R)
• M49: 11,021,324 km (0.047 R)
• M50: 11,310,497 km (0.099 R)
• M51: 11,994,608 km (0.111 R)
• M52: 12,358,280 km (0.094 R)
• M53: 12,860,181 km (0.077 R)
• M54: 13,471,139 km (0.084 R)
• M55: 14,022,257 km (0.042 R)
• M56: 14,335,366 km (0.11 R)
• M57: 14,615,712 km (0.097 R)
• M58: 15,755,199 km (0.082 R)
• M59: 16,117,226 km (0.114 R)
• M60: 16,702,004 km (0.103 R)
• M61: 17,108,162 km (0.086 R)
• M62: 17,182,363 km (0.084 R)
• M63: 17,256,563 km (0.103 R)
• M64: 17,368,313 km (0.028 R)
• M65: 17,442,813 km (0.026 R)
• M66: 18,118,696 km (0.099 R)
• M67: 18,232,091 km (0.071 R)
• M68: 18,421,781 km (0.096 R)
• M69: 19,186,974 km (0.097 R)
• M70: 19,302,613 km (0.045 R)
• M71: 19,767,713 km (0.091 R)
• M72: 19,845,504 km (0.093 R)
• M73: 20,787,821 km (0.12 R)
• M74: 21,304,382 km (0.116 R)
• M75: 21,424,210 km (0.05 R)
• M76: 21,544,188 km (0.1 R)
• M77: 21,986,249 km (0.098 R)
• M78: 22,309,530 km (0.055 R)
• M79: 22,512,385 km (0.073 R)
• M80: 23,083,849 km (0.069 R)
• M81: 23,908,283 km (0.085 R)
• M82: 24,324,165 km (0.071 R)
• M83: 25,036,550 km (0.107 R)
• M84: 26,396,245 km (0.099 R)
• M85: 26,912,208 km (0.091 R)
• M86: 26,998,526 km (0.116 R)
• M87: 27,258,078 km (0.07 R)
• M88: 27,561,912 km (0.032 R)
• M89: 27,910,624 km (0.112 R)
• M90: 28,173,019 km (0.091 R)
• M91: 29,319,687 km (0.051 R)

Planet 4 - Gas Giant

Semi-Major Axis: 3.62 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 224.1

Radius: 9.9

Gravity: 2.29 G

Time & Orbit

Eccentricity (e): 0.046

Orbit Range: 3.45 AU - 3.79 AU

Year: 4841 Days

Day: 11.4 Hours

Environment

Temp: -224 °C

Axial Tilt: 1.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (62)

Outer Limit: 80,975,587 km

• M1: 128,205 km (0.105 R)
• M2: 303,534 km (0.087 R)
• M3: 697,126 km (0.104 R)
• M4: 922,869 km (0.073 R)
• M5: 1,160,730 km (0.03 R)
• M6: 1,358,349 km (0.086 R)
• M7: 1,430,754 km (0.118 R)
• M8: 1,504,506 km (0.108 R)
• M9: 1,681,779 km (0.109 R)
• M10: 2,112,920 km (0.069 R)
• M11: 2,502,922 km (0.067 R)
• M12: 2,915,662 km (0.07 R)
• M13: 3,218,897 km (0.12 R)
• M14: 3,515,849 km (0.064 R)
• M15: 3,616,678 km (0.102 R)
• M16: 4,495,117 km (0.109 R)
• M17: 4,864,474 km (0.092 R)
• M18: 5,128,963 km (0.102 R)
• M19: 5,359,344 km (0.118 R)
• M20: 5,514,926 km (0.061 R)
• M21: 5,691,601 km (0.112 R)
• M22: 5,830,427 km (0.065 R)
• M23: 6,253,640 km (0.118 R)
• M24: 6,355,815 km (0.12 R)
• M25: 6,791,295 km (0.1 R)
• M26: 7,087,050 km (0.102 R)
• M27: 7,408,535 km (0.072 R)
• M28: 7,625,602 km (0.092 R)
• M29: 7,756,799 km (0.082 R)
• M30: 7,822,772 km (0.102 R)
• M31: 8,132,739 km (0.113 R)
• M32: 8,334,247 km (0.089 R)
• M33: 8,424,305 km (0.03 R)
• M34: 8,787,828 km (0.082 R)
• M35: 10,365,337 km (0.097 R)
• M36: 10,803,809 km (0.047 R)
• M37: 11,348,195 km (0.079 R)
• M38: 11,623,605 km (0.057 R)
• M39: 11,699,152 km (0.104 R)
• M40: 11,774,848 km (0.12 R)
• M41: 11,952,122 km (0.108 R)
• M42: 12,463,447 km (0.048 R)
• M43: 12,540,640 km (0.119 R)
• M44: 12,747,683 km (0.081 R)
• M45: 12,825,624 km (0.105 R)
• M46: 13,454,533 km (0.112 R)
• M47: 13,560,299 km (0.04 R)
• M48: 14,174,099 km (0.093 R)
• M49: 15,318,074 km (0.044 R)
• M50: 16,069,205 km (0.072 R)
• M51: 16,775,307 km (0.057 R)
• M52: 17,261,350 km (0.096 R)
• M53: 17,405,114 km (0.098 R)
• M54: 17,664,965 km (0.102 R)
• M55: 17,751,882 km (0.074 R)
• M56: 17,955,335 km (0.076 R)
• M57: 18,247,200 km (0.097 R)
• M58: 18,540,562 km (0.119 R)
• M59: 18,983,671 km (0.093 R)
• M60: 19,191,612 km (0.086 R)
• M61: 19,370,531 km (0.077 R)
• M62: 20,031,005 km (0.098 R)

Planet 5 - Ice Giant

Semi-Major Axis: 5.62 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 195.4

Radius: 6.9

Gravity: 4.1 G

Time & Orbit

Eccentricity (e): 0.203

Orbit Range: 4.48 AU - 6.76 AU

Year: 9365 Days

Day: 22.3 Hours

Environment

Temp: -235 °C

Axial Tilt: 16.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 80,975,587 km

• M1: 86,767 km (0.1 R)
• M2: 146,756 km (0.086 R)
• M3: 226,940 km (0.117 R)
• M4: 354,397 km (0.095 R)
• M5: 528,380 km (0.034 R)
• M6: 692,040 km (0.085 R)
• M7: 1,125,126 km (0.079 R)
• M8: 1,400,834 km (0.114 R)
• M9: 1,546,692 km (0.086 R)
• M10: 1,714,392 km (0.097 R)
• M11: 2,013,288 km (0.074 R)
• M12: 2,104,393 km (0.069 R)
• M13: 2,290,643 km (0.094 R)
• M14: 2,443,532 km (0.103 R)
• M15: 2,860,760 km (0.106 R)
• M16: 3,193,615 km (0.087 R)
• M17: 3,300,129 km (0.026 R)
• M18: 3,582,719 km (0.067 R)
• M19: 3,693,422 km (0.097 R)
• M20: 4,500,353 km (0.074 R)
• M21: 4,620,031 km (0.077 R)
• M22: 4,740,607 km (0.119 R)
• M23: 5,233,831 km (0.068 R)
• M24: 5,743,361 km (0.08 R)
• M25: 5,821,152 km (0.045 R)
• M26: 7,057,429 km (0.09 R)
• M27: 7,534,198 km (0.115 R)
• M28: 7,591,045 km (0.111 R)
• M29: 7,705,038 km (0.08 R)
• M30: 7,848,353 km (0.047 R)
• M31: 7,963,543 km (0.11 R)
• M32: 8,548,471 km (0.087 R)
• M33: 8,996,068 km (0.084 R)
• M34: 9,268,336 km (0.102 R)
• M35: 9,482,111 km (0.115 R)
• M36: 9,821,100 km (0.115 R)
• M37: 9,883,183 km (0.106 R)
• M38: 10,132,713 km (0.099 R)
• M39: 10,226,959 km (0.098 R)
• M40: 10,447,766 km (0.106 R)
• M41: 10,797,825 km (0.103 R)
• M42: 11,314,087 km (0.079 R)
• M43: 11,411,774 km (0.065 R)
• M44: 11,838,278 km (0.089 R)
• M45: 12,303,527 km (0.073 R)
• M46: 13,080,688 km (0.108 R)
• M47: 13,320,344 km (0.11 R)
• M48: 13,665,317 km (0.12 R)
• M49: 13,978,275 km (0.073 R)
• M50: 15,253,597 km (0.107 R)
• M51: 15,433,713 km (0.097 R)
• M52: 15,650,780 km (0.111 R)
• M53: 17,085,872 km (0.057 R)
• M54: 17,498,164 km (0.117 R)
• M55: 17,611,110 km (0.103 R)
• M56: 17,951,744 km (0.102 R)
• M57: 18,332,621 km (0.096 R)
• M58: 18,447,362 km (0.101 R)
• M59: 18,831,829 km (0.083 R)
• M60: 18,909,021 km (0.034 R)
• M61: 19,063,705 km (0.106 R)
• M62: 19,141,197 km (0.066 R)
• M63: 19,686,781 km (0.068 R)
• M64: 20,040,131 km (0.094 R)
• M65: 20,475,012 km (0.103 R)
• M66: 21,193,082 km (0.056 R)
• M67: 21,838,447 km (0.116 R)
• M68: 22,041,451 km (0.089 R)
• M69: 22,859,602 km (0.06 R)
• M70: 23,687,626 km (0.062 R)
• M71: 24,483,487 km (0.057 R)
• M72: 24,609,897 km (0.12 R)
• M73: 24,821,129 km (0.055 R)
• M74: 25,287,874 km (0.106 R)
• M75: 25,629,257 km (0.078 R)
• M76: 26,575,763 km (0.041 R)
• M77: 26,662,380 km (0.119 R)
• M78: 26,835,913 km (0.107 R)
• M79: 28,237,496 km (0.079 R)
• M80: 28,325,908 km (0.12 R)
• M81: 29,662,715 km (0.049 R)
• M82: 29,887,560 km (0.083 R)
• M83: 29,977,618 km (0.118 R)

Planet 6 - Ice Giant

Semi-Major Axis: 9.73 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 725.6

Radius: 6.5

Gravity: 17.17 G

Time & Orbit

Eccentricity (e): 0.044

Orbit Range: 9.3 AU - 10.16 AU

Year: 21334 Days

Day: 16.2 Hours

Environment

Temp: -231 °C

Axial Tilt: 44.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (90)

Outer Limit: 80,975,587 km

• M1: 83,326 km (0.091 R)
• M2: 587,920 km (0.115 R)
• M3: 1,067,830 km (0.115 R)
• M4: 1,181,674 km (0.087 R)
• M5: 1,546,992 km (0.077 R)
• M6: 1,980,377 km (0.061 R)
• M7: 2,156,753 km (0.105 R)
• M8: 2,524,763 km (0.108 R)
• M9: 4,093,447 km (0.099 R)
• M10: 4,733,426 km (0.093 R)
• M11: 4,969,641 km (0.062 R)
• M12: 6,104,790 km (0.086 R)
• M13: 7,262,079 km (0.115 R)
• M14: 7,370,687 km (0.058 R)
• M15: 7,425,141 km (0.111 R)
• M16: 9,120,533 km (0.067 R)
• M17: 9,532,676 km (0.059 R)
• M18: 11,556,436 km (0.113 R)
• M19: 11,746,724 km (0.056 R)
• M20: 11,874,331 km (0.107 R)
• M21: 15,068,844 km (0.054 R)
• M22: 15,416,061 km (0.112 R)
• M23: 16,402,210 km (0.071 R)
• M24: 16,687,792 km (0.041 R)
• M25: 16,759,449 km (0.094 R)
• M26: 18,508,997 km (0.048 R)
• M27: 19,783,122 km (0.098 R)
• M28: 20,087,104 km (0.092 R)
• M29: 20,545,772 km (0.114 R)
• M30: 20,622,515 km (0.116 R)
• M31: 21,085,371 km (0.118 R)
• M32: 21,473,578 km (0.11 R)
• M33: 21,864,178 km (0.11 R)
• M34: 22,336,009 km (0.097 R)
• M35: 23,209,661 km (0.059 R)
• M36: 24,826,814 km (0.053 R)
• M37: 25,154,583 km (0.056 R)
• M38: 26,396,395 km (0.11 R)
• M39: 26,647,121 km (0.103 R)
• M40: 29,025,278 km (0.116 R)
• M41: 29,630,401 km (0.115 R)
• M42: 30,327,079 km (0.118 R)
• M43: 30,414,593 km (0.057 R)
• M44: 30,941,028 km (0.08 R)
• M45: 32,092,184 km (0.033 R)
• M46: 32,270,505 km (0.1 R)
• M47: 33,077,136 km (0.073 R)
• M48: 34,527,338 km (0.118 R)
• M49: 35,352,221 km (0.067 R)
• M50: 35,628,528 km (0.083 R)
• M51: 36,462,087 km (0.109 R)
• M52: 36,741,387 km (0.103 R)
• M53: 39,000,913 km (0.074 R)
• M54: 39,286,495 km (0.058 R)
• M55: 39,859,754 km (0.043 R)
• M56: 40,051,389 km (0.09 R)
• M57: 41,985,241 km (0.1 R)
• M58: 42,180,316 km (0.111 R)
• M59: 42,571,365 km (0.046 R)
• M60: 43,356,904 km (0.105 R)
• M61: 44,048,345 km (0.034 R)
• M62: 44,147,379 km (0.108 R)
• M63: 45,742,391 km (0.05 R)
• M64: 46,547,078 km (0.112 R)
• M65: 46,647,907 km (0.084 R)
• M66: 47,660,984 km (0.088 R)
• M67: 48,476,592 km (0.094 R)
• M68: 48,988,815 km (0.081 R)
• M69: 49,708,829 km (0.049 R)
• M70: 50,535,956 km (0.091 R)
• M71: 51,576,110 km (0.096 R)
• M72: 54,526,329 km (0.114 R)
• M73: 57,964,388 km (0.079 R)
• M74: 58,072,996 km (0.088 R)
• M75: 58,725,841 km (0.089 R)
• M76: 58,943,955 km (0.095 R)
• M77: 59,271,724 km (0.071 R)
• M78: 60,478,530 km (0.119 R)
• M79: 60,588,634 km (0.082 R)
• M80: 60,808,991 km (0.099 R)
• M81: 61,029,798 km (0.042 R)
• M82: 62,137,271 km (0.032 R)
• M83: 64,371,964 km (0.098 R)
• M84: 64,822,104 km (0.093 R)
• M85: 65,160,345 km (0.076 R)
• M86: 66,860,524 km (0.098 R)
• M87: 74,276,540 km (0.108 R)
• M88: 74,985,035 km (0.113 R)
• M89: 76,170,748 km (0.19 R)
• M90: 80,611,860 km (0.112 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: 392 - 17,700 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit