🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.29 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 620.8

Radius: 10.9

Gravity: 5.23 G

Time & Orbit

Eccentricity (e): 0.007

Orbit Range: 0.58 AU - 0.58 AU

Year: 305 Days

Day: 8.6 Hours

Environment

Temp: -142 °C

Axial Tilt: 11.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (39)

Outer Limit: 53,147,843 km

• M1: 142,866 km (0.077 R)
• M2: 213,476 km (0.088 R)
• M3: 287,078 km (0.117 R)
• M4: 363,074 km (0.097 R)
• M5: 490,681 km (0.042 R)
• M6: 588,668 km (0.109 R)
• M7: 677,978 km (0.039 R)
• M8: 835,654 km (0.047 R)
• M9: 908,209 km (0.026 R)
• M10: 1,013,825 km (0.119 R)
• M11: 1,092,064 km (0.101 R)
• M12: 1,188,705 km (0.117 R)
• M13: 1,267,393 km (0.119 R)
• M14: 1,339,499 km (0.069 R)
• M15: 1,430,455 km (0.035 R)
• M16: 1,519,166 km (0.109 R)
• M17: 1,591,422 km (0.107 R)
• M18: 1,810,882 km (0.119 R)
• M19: 1,902,436 km (0.075 R)
• M20: 2,045,302 km (0.115 R)
• M21: 2,176,499 km (0.084 R)
• M22: 2,484,970 km (0.117 R)
• M23: 2,696,502 km (0.05 R)
• M24: 2,801,819 km (0.084 R)
• M25: 2,885,893 km (0.065 R)
• M26: 2,987,918 km (0.057 R)
• M27: 3,102,809 km (0.104 R)
• M28: 3,189,875 km (0.033 R)
• M29: 3,402,454 km (0.042 R)
• M30: 3,504,480 km (0.117 R)
• M31: 3,644,055 km (0.081 R)
• M32: 3,736,207 km (0.091 R)
• M33: 3,816,541 km (0.027 R)
• M34: 3,903,906 km (0.096 R)
• M35: 3,979,303 km (0.038 R)
• M36: 4,106,013 km (0.068 R)
• M37: 4,182,607 km (0.101 R)
• M38: 4,292,113 km (0.119 R)
• M39: 4,468,040 km (0.115 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.82 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 885.9

Radius: 13

Gravity: 5.24 G

Time & Orbit

Eccentricity (e): 0.07

Orbit Range: 0.76 AU - 0.88 AU

Year: 513 Days

Day: 6.9 Hours

Environment

Temp: -170 °C

Axial Tilt: 19.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (43)

Outer Limit: 53,147,843 km

• M1: 163,510 km (0.079 R)
• M2: 247,584 km (0.04 R)
• M3: 394,490 km (0.105 R)
• M4: 487,988 km (0.035 R)
• M5: 704,157 km (0.09 R)
• M6: 796,459 km (0.091 R)
• M7: 883,675 km (0.093 R)
• M8: 1,084,734 km (0.055 R)
• M9: 1,199,775 km (0.073 R)
• M10: 1,319,154 km (0.107 R)
• M11: 1,401,134 km (0.075 R)
• M12: 1,503,159 km (0.091 R)
• M13: 1,721,423 km (0.071 R)
• M14: 1,805,198 km (0.057 R)
• M15: 1,903,783 km (0.089 R)
• M16: 2,044,853 km (0.117 R)
• M17: 2,373,669 km (0.093 R)
• M18: 2,460,436 km (0.067 R)
• M19: 2,803,015 km (0.097 R)
• M20: 2,918,206 km (0.092 R)
• M21: 3,003,626 km (0.044 R)
• M22: 3,105,801 km (0.066 R)
• M23: 3,209,024 km (0.06 R)
• M24: 3,427,287 km (0.056 R)
• M25: 3,559,083 km (0.05 R)
• M26: 3,642,259 km (0.035 R)
• M27: 3,930,086 km (0.08 R)
• M28: 4,024,781 km (0.046 R)
• M29: 4,120,374 km (0.097 R)
• M30: 4,234,218 km (0.076 R)
• M31: 4,349,259 km (0.118 R)
• M32: 4,654,887 km (0.083 R)
• M33: 4,773,668 km (0.119 R)
• M34: 4,884,221 km (0.082 R)
• M35: 5,154,843 km (0.107 R)
• M36: 5,373,107 km (0.055 R)
• M37: 5,507,446 km (0.103 R)
• M38: 5,858,253 km (0.12 R)
• M39: 6,186,171 km (0.073 R)
• M40: 6,276,678 km (0.091 R)
• M41: 6,398,002 km (0.112 R)
• M42: 6,735,794 km (0.096 R)
• M43: 7,195,358 km (0.038 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.11 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 290.9

Radius: 11.5

Gravity: 2.2 G

Time & Orbit

Eccentricity (e): 0.145

Orbit Range: 0.95 AU - 1.27 AU

Year: 807 Days

Day: 12.5 Hours

Environment

Temp: -184 °C

Axial Tilt: 11 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (45)

Outer Limit: 53,147,843 km

• M1: 156,330 km (0.096 R)
• M2: 264,938 km (0.101 R)
• M3: 393,143 km (0.105 R)
• M4: 533,316 km (0.069 R)
• M5: 662,868 km (0.088 R)
• M6: 961,316 km (0.103 R)
• M7: 1,082,490 km (0.076 R)
• M8: 1,274,275 km (0.087 R)
• M9: 1,466,059 km (0.071 R)
• M10: 1,565,691 km (0.094 R)
• M11: 1,759,570 km (0.12 R)
• M12: 2,078,513 km (0.079 R)
• M13: 2,340,159 km (0.07 R)
• M14: 2,513,693 km (0.113 R)
• M15: 2,634,269 km (0.095 R)
• M16: 2,742,129 km (0.101 R)
• M17: 2,940,197 km (0.087 R)
• M18: 3,037,286 km (0.064 R)
• M19: 3,112,683 km (0.108 R)
• M20: 3,296,389 km (0.038 R)
• M21: 3,554,894 km (0.105 R)
• M22: 3,714,814 km (0.075 R)
• M23: 3,877,128 km (0.102 R)
• M24: 4,066,818 km (0.032 R)
• M25: 4,141,767 km (0.053 R)
• M26: 4,225,841 km (0.117 R)
• M27: 4,412,539 km (0.093 R)
• M28: 4,636,786 km (0.112 R)
• M29: 4,759,007 km (0.086 R)
• M30: 4,909,054 km (0.101 R)
• M31: 5,015,867 km (0.101 R)
• M32: 5,114,452 km (0.077 R)
• M33: 5,204,660 km (0.049 R)
• M34: 5,295,465 km (0.056 R)
• M35: 5,368,469 km (0.087 R)
• M36: 5,515,524 km (0.077 R)
• M37: 5,589,575 km (0.08 R)
• M38: 5,663,925 km (0.116 R)
• M39: 5,964,617 km (0.082 R)
• M40: 6,059,611 km (0.038 R)
• M41: 6,136,056 km (0.068 R)
• M42: 6,241,672 km (0.043 R)
• M43: 6,328,588 km (0.089 R)
• M44: 6,532,939 km (0.06 R)
• M45: 6,680,143 km (0.087 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.15 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 999.7

Radius: 10.7

Gravity: 8.73 G

Time & Orbit

Eccentricity (e): 0.106

Orbit Range: 1.03 AU - 1.27 AU

Year: 851 Days

Day: 6.5 Hours

Environment

Temp: -177 °C

Axial Tilt: 17.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (56)

Outer Limit: 53,147,843 km

• M1: 169,345 km (0.102 R)
• M2: 245,789 km (0.117 R)
• M3: 313,258 km (0.039 R)
• M4: 404,213 km (0.114 R)
• M5: 491,579 km (0.117 R)
• M6: 614,398 km (0.076 R)
• M7: 688,898 km (0.06 R)
• M8: 829,371 km (0.094 R)
• M9: 913,145 km (0.115 R)
• M10: 1,013,825 km (0.114 R)
• M11: 1,083,238 km (0.116 R)
• M12: 1,175,839 km (0.096 R)
• M13: 1,316,461 km (0.073 R)
• M14: 1,566,290 km (0.093 R)
• M15: 1,747,004 km (0.089 R)
• M16: 1,995,935 km (0.117 R)
• M17: 2,183,531 km (0.1 R)
• M18: 2,433,209 km (0.106 R)
• M19: 2,576,075 km (0.079 R)
• M20: 2,672,865 km (0.047 R)
• M21: 2,820,369 km (0.113 R)
• M22: 2,950,519 km (0.098 R)
• M23: 3,352,937 km (0.109 R)
• M24: 3,491,016 km (0.119 R)
• M25: 3,587,656 km (0.098 R)
• M26: 3,894,332 km (0.098 R)
• M27: 4,164,057 km (0.069 R)
• M28: 4,521,446 km (0.108 R)
• M29: 4,662,517 km (0.06 R)
• M30: 4,757,362 km (0.105 R)
• M31: 4,924,912 km (0.055 R)
• M32: 5,167,709 km (0.027 R)
• M33: 5,241,311 km (0.085 R)
• M34: 5,426,812 km (0.073 R)
• M35: 5,690,404 km (0.054 R)
• M36: 5,766,400 km (0.118 R)
• M37: 5,855,709 km (0.06 R)
• M38: 5,932,453 km (0.092 R)
• M39: 6,203,973 km (0.1 R)
• M40: 6,479,533 km (0.095 R)
• M41: 6,625,540 km (0.084 R)
• M42: 6,772,744 km (0.068 R)
• M43: 6,880,305 km (0.03 R)
• M44: 7,358,121 km (0.086 R)
• M45: 7,482,736 km (0.104 R)
• M46: 7,636,074 km (0.055 R)
• M47: 8,345,766 km (0.115 R)
• M48: 8,490,278 km (0.117 R)
• M49: 8,840,486 km (0.09 R)
• M50: 8,943,559 km (0.029 R)
• M51: 9,061,741 km (0.068 R)
• M52: 9,767,095 km (0.092 R)
• M53: 10,041,907 km (0.091 R)
• M54: 10,149,468 km (0.105 R)
• M55: 10,272,886 km (0.095 R)
• M56: 10,427,869 km (0.071 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 127.3

Radius: 10.2

Gravity: 1.22 G

Time & Orbit

Eccentricity (e): 0.242

Orbit Range: 1.01 AU - 1.65 AU

Year: 1059 Days

Day: 11 Hours

Environment

Temp: -183 °C

Axial Tilt: 33.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (51)

Outer Limit: 53,147,843 km

• M1: 130,300 km (0.104 R)
• M2: 212,728 km (0.112 R)
• M3: 280,646 km (0.105 R)
• M4: 420,968 km (0.114 R)
• M5: 510,578 km (0.097 R)
• M6: 611,556 km (0.036 R)
• M7: 691,441 km (0.066 R)
• M8: 775,216 km (0.102 R)
• M9: 876,195 km (0.099 R)
• M10: 949,348 km (0.045 R)
• M11: 1,092,214 km (0.039 R)
• M12: 1,186,760 km (0.101 R)
• M13: 1,346,979 km (0.103 R)
• M14: 1,416,393 km (0.107 R)
• M15: 1,520,064 km (0.082 R)
• M16: 1,620,743 km (0.1 R)
• M17: 1,747,004 km (0.102 R)
• M18: 1,876,556 km (0.109 R)
• M19: 1,972,897 km (0.077 R)
• M20: 2,052,333 km (0.079 R)
• M21: 2,290,942 km (0.094 R)
• M22: 2,453,106 km (0.098 R)
• M23: 2,545,408 km (0.097 R)
• M24: 2,706,674 km (0.103 R)
• M25: 2,781,772 km (0.085 R)
• M26: 2,857,469 km (0.107 R)
• M27: 2,947,976 km (0.055 R)
• M28: 3,074,685 km (0.109 R)
• M29: 3,203,339 km (0.087 R)
• M30: 3,451,372 km (0.045 R)
• M31: 3,547,863 km (0.111 R)
• M32: 3,698,209 km (0.099 R)
• M33: 3,881,317 km (0.118 R)
• M34: 3,950,730 km (0.057 R)
• M35: 4,051,858 km (0.047 R)
• M36: 4,130,098 km (0.068 R)
• M37: 4,240,651 km (0.084 R)
• M38: 4,336,244 km (0.101 R)
• M39: 4,456,670 km (0.119 R)
• M40: 4,521,446 km (0.078 R)
• M41: 4,618,984 km (0.105 R)
• M42: 4,717,419 km (0.056 R)
• M43: 4,799,997 km (0.099 R)
• M44: 4,866,269 km (0.051 R)
• M45: 4,949,745 km (0.025 R)
• M46: 5,391,058 km (0.083 R)
• M47: 5,468,700 km (0.111 R)
• M48: 5,607,826 km (0.101 R)
• M49: 5,712,843 km (0.086 R)
• M50: 5,924,973 km (0.116 R)
• M51: 6,005,158 km (0.1 R)

Planet 6 - Ice Giant

Semi-Major Axis: 9.88 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 965.4

Radius: 3.3

Gravity: 88.65 G

Time & Orbit

Eccentricity (e): 0.003

Orbit Range: 9.85 AU - 9.91 AU

Year: 21436 Days

Day: 15.8 Hours

Environment

Temp: -232 °C

Axial Tilt: 4.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (97)

Outer Limit: 53,147,843 km

• M1: 49,068 km (0.052 R)
• M2: 144,063 km (0.095 R)
• M3: 293,661 km (0.111 R)
• M4: 373,097 km (0.083 R)
• M5: 437,275 km (0.096 R)
• M6: 1,039,556 km (0.057 R)
• M7: 1,069,625 km (0.072 R)
• M8: 1,161,627 km (0.076 R)
• M9: 1,256,323 km (0.076 R)
• M10: 2,822,762 km (0.065 R)
• M11: 3,707,035 km (0.081 R)
• M12: 4,035,253 km (0.045 R)
• M13: 4,275,358 km (0.085 R)
• M14: 4,519,950 km (0.051 R)
• M15: 4,569,467 km (0.032 R)
• M16: 4,971,885 km (0.102 R)
• M17: 6,026,550 km (0.062 R)
• M18: 6,300,614 km (0.055 R)
• M19: 7,554,244 km (0.067 R)
• M20: 8,088,607 km (0.119 R)
• M21: 8,209,034 km (0.049 R)
• M22: 8,512,717 km (0.064 R)
• M23: 9,006,091 km (0.087 R)
• M24: 9,763,355 km (0.081 R)
• M25: 12,500,548 km (0.111 R)
• M26: 13,343,382 km (0.119 R)
• M27: 14,204,617 km (0.065 R)
• M28: 15,231,756 km (0.106 R)
• M29: 16,130,989 km (0.066 R)
• M30: 17,279,152 km (0.064 R)
• M31: 17,511,927 km (0.087 R)
• M32: 17,980,617 km (0.057 R)
• M33: 18,059,156 km (0.112 R)
• M34: 18,611,920 km (0.119 R)
• M35: 19,330,738 km (0.12 R)
• M36: 19,411,072 km (0.117 R)
• M37: 21,125,613 km (0.099 R)
• M38: 22,464,065 km (0.064 R)
• M39: 22,718,082 km (0.11 R)
• M40: 22,973,147 km (0.111 R)
• M41: 23,400,099 km (0.056 R)
• M42: 23,657,557 km (0.09 R)
• M43: 26,819,607 km (0.053 R)
• M44: 27,993,651 km (0.045 R)
• M45: 28,816,140 km (0.09 R)
• M46: 31,048,140 km (0.094 R)
• M47: 33,721,305 km (0.059 R)
• M48: 34,498,615 km (0.103 R)
• M49: 34,693,841 km (0.048 R)
• M50: 36,666,139 km (0.102 R)
• M51: 37,164,898 km (0.093 R)
• M52: 37,365,060 km (0.088 R)
• M53: 37,465,291 km (0.114 R)
• M54: 42,274,264 km (0.094 R)
• M55: 45,016,542 km (0.085 R)
• M56: 46,086,466 km (0.075 R)
• M57: 47,164,917 km (0.116 R)
• M58: 48,360,504 km (0.093 R)
• M59: 50,449,339 km (0.101 R)
• M60: 50,892,747 km (0.1 R)
• M61: 51,003,898 km (0.083 R)
• M62: 52,791,892 km (0.119 R)
• M63: 56,199,432 km (0.068 R)
• M64: 57,697,954 km (0.037 R)
• M65: 58,161,707 km (0.119 R)
• M66: 58,859,581 km (0.039 R)
• M67: 59,092,805 km (0.087 R)
• M68: 62,271,759 km (0.098 R)
• M69: 62,985,640 km (0.097 R)
• M70: 64,541,757 km (0.103 R)
• M71: 64,782,311 km (0.052 R)
• M72: 66,717,210 km (0.12 R)
• M73: 67,936,133 km (0.105 R)
• M74: 68,058,354 km (0.038 R)
• M75: 69,039,417 km (0.051 R)
• M76: 69,654,863 km (0.088 R)
• M77: 70,643,555 km (0.117 R)
• M78: 71,015,456 km (0.111 R)
• M79: 73,135,257 km (0.116 R)
• M80: 73,260,471 km (0.078 R)
• M81: 73,762,671 km (0.109 R)
• M82: 75,022,734 km (0.091 R)
• M83: 75,402,264 km (0.075 R)
• M84: 76,290,127 km (0.095 R)
• M85: 77,948,120 km (0.117 R)
• M86: 79,102,866 km (0.117 R)
• M87: 80,651,354 km (0.094 R)
• M88: 81,819,414 km (0.029 R)
• M89: 81,949,414 km (0.091 R)
• M90: 83,778,248 km (0.111 R)
• M91: 83,909,446 km (0.08 R)
• M92: 84,697,826 km (0.075 R)
• M93: 84,829,473 km (0.103 R)
• M94: 85,884,886 km (0.107 R)
• M95: 87,343,166 km (0.068 R)
• M96: 87,875,584 km (0.106 R)
• M97: 88,943,414 km (0.103 R)

Planet 7 - Ice Giant

Semi-Major Axis: 10.06 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 192.5

Radius: 3.3

Gravity: 17.68 G

Time & Orbit

Eccentricity (e): 0.08

Orbit Range: 9.26 AU - 10.86 AU

Year: 22025 Days

Day: 16.8 Hours

Environment

Temp: -244 °C

Axial Tilt: 24.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 53,147,843 km

• M1: 78,988 km (0.109 R)
• M2: 148,551 km (0.094 R)
• M3: 238,459 km (0.117 R)
• M4: 316,998 km (0.034 R)
• M5: 359,334 km (0.105 R)
• M6: 388,805 km (0.049 R)
• M7: 652,696 km (0.091 R)
• M8: 841,189 km (0.052 R)
• M9: 1,197,980 km (0.091 R)
• M10: 1,427,463 km (0.064 R)
• M11: 1,645,427 km (0.076 R)
• M12: 1,720,376 km (0.052 R)
• M13: 1,822,252 km (0.102 R)
• M14: 1,899,743 km (0.091 R)
• M15: 2,221,080 km (0.064 R)
• M16: 2,248,606 km (0.1 R)
• M17: 2,704,580 km (0.107 R)
• M18: 2,912,820 km (0.111 R)
• M19: 3,034,144 km (0.112 R)
• M20: 3,219,346 km (0.109 R)
• M21: 3,313,144 km (0.11 R)
• M22: 4,404,610 km (0.06 R)
• M23: 4,614,047 km (0.106 R)
• M24: 4,826,775 km (0.111 R)
• M25: 5,151,702 km (0.071 R)
• M26: 5,298,457 km (0.096 R)
• M27: 5,671,255 km (0.065 R)
• M28: 6,919,799 km (0.046 R)
• M29: 7,081,664 km (0.088 R)
• M30: 7,122,355 km (0.068 R)
• M31: 7,574,589 km (0.09 R)
• M32: 9,163,019 km (0.084 R)
• M33: 9,654,448 km (0.098 R)
• M34: 10,338,260 km (0.078 R)
• M35: 10,990,357 km (0.101 R)
• M36: 11,703,789 km (0.114 R)
• M37: 11,848,301 km (0.071 R)
• M38: 12,777,005 km (0.068 R)
• M39: 13,983,063 km (0.118 R)
• M40: 14,238,875 km (0.036 R)
• M41: 15,015,587 km (0.064 R)
• M42: 15,225,024 km (0.099 R)
• M43: 15,277,533 km (0.115 R)
• M44: 15,646,740 km (0.077 R)
• M45: 15,699,698 km (0.094 R)
• M46: 16,072,346 km (0.077 R)
• M47: 16,125,753 km (0.12 R)
• M48: 16,501,692 km (0.091 R)
• M49: 16,989,381 km (0.048 R)
• M50: 19,099,459 km (0.069 R)
• M51: 19,782,822 km (0.034 R)
• M52: 19,954,860 km (0.081 R)
• M53: 21,173,335 km (0.083 R)
• M54: 21,231,977 km (0.059 R)
• M55: 21,408,054 km (0.062 R)
• M56: 21,761,853 km (0.056 R)
• M57: 21,998,816 km (0.115 R)
• M58: 22,475,285 km (0.119 R)
• M59: 23,196,347 km (0.049 R)
• M60: 23,986,074 km (0.06 R)
• M61: 25,093,996 km (0.092 R)
• M62: 25,841,835 km (0.112 R)
• M63: 26,597,005 km (0.118 R)
• M64: 27,040,713 km (0.101 R)
• M65: 27,168,021 km (0.108 R)
• M66: 27,486,963 km (0.103 R)
• M67: 27,679,047 km (0.088 R)
• M68: 27,871,430 km (0.115 R)
• M69: 28,840,375 km (0.119 R)
• M70: 28,905,301 km (0.107 R)
• M71: 28,970,376 km (0.114 R)
• M72: 29,623,370 km (0.105 R)
• M73: 30,744,606 km (0.078 R)
• M74: 31,143,734 km (0.119 R)
• M75: 31,343,895 km (0.098 R)
• M76: 32,081,413 km (0.102 R)
• M77: 32,283,520 km (0.118 R)
• M78: 32,486,075 km (0.039 R)
• M79: 33,232,419 km (0.108 R)
• M80: 33,642,018 km (0.084 R)
• M81: 38,469,541 km (0.117 R)
• M82: 39,474,989 km (0.092 R)
• M83: 40,271,148 km (0.116 R)
• M84: 41,145,698 km (0.093 R)
• M85: 41,365,307 km (0.045 R)
• M86: 42,765,244 km (0.115 R)
• M87: 45,007,118 km (0.11 R)
• M88: 46,598,989 km (0.055 R)
• M89: 50,462,503 km (0.087 R)
• M90: 50,776,060 km (0.108 R)
• M91: 52,670,568 km (0.103 R)
• M92: 53,147,785 km (0.086 R)

Kuiper Belt

Range: 30 - 49 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 319 - 18,447 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit