🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.67 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.34 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 252.6

Radius: 14.9

Gravity: 1.14 G

Time & Orbit

Eccentricity (e): 0.131

Orbit Range: 1.16 AU - 1.52 AU

Year: 1052 Days

Day: 12.2 Hours

Environment

Temp: -189 °C

Axial Tilt: 21.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (45)

Outer Limit: 80,802,477 km

• M1: 187,147 km (0.095 R)
• M2: 287,078 km (0.07 R)
• M3: 515,664 km (0.087 R)
• M4: 709,244 km (0.084 R)
• M5: 940,971 km (0.057 R)
• M6: 1,053,169 km (0.114 R)
• M7: 1,147,864 km (0.111 R)
• M8: 1,310,627 km (0.066 R)
• M9: 1,407,417 km (0.097 R)
• M10: 1,557,463 km (0.087 R)
• M11: 1,799,962 km (0.091 R)
• M12: 1,936,245 km (0.115 R)
• M13: 2,154,957 km (0.068 R)
• M14: 2,271,045 km (0.114 R)
• M15: 2,456,846 km (0.099 R)
• M16: 2,578,469 km (0.111 R)
• M17: 2,788,504 km (0.095 R)
• M18: 2,915,812 km (0.085 R)
• M19: 3,234,306 km (0.098 R)
• M20: 3,419,059 km (0.064 R)
• M21: 3,607,403 km (0.118 R)
• M22: 3,711,673 km (0.076 R)
• M23: 3,825,666 km (0.117 R)
• M24: 4,138,775 km (0.064 R)
• M25: 4,497,660 km (0.105 R)
• M26: 4,610,158 km (0.107 R)
• M27: 4,780,699 km (0.093 R)
• M28: 4,924,463 km (0.115 R)
• M29: 5,069,573 km (0.117 R)
• M30: 5,334,660 km (0.042 R)
• M31: 5,503,855 km (0.088 R)
• M32: 5,695,191 km (0.105 R)
• M33: 5,868,276 km (0.087 R)
• M34: 6,032,833 km (0.047 R)
• M35: 6,167,621 km (0.055 R)
• M36: 6,261,568 km (0.091 R)
• M37: 6,398,151 km (0.105 R)
• M38: 6,567,646 km (0.074 R)
• M39: 6,684,930 km (0.112 R)
• M40: 6,781,571 km (0.109 R)
• M41: 6,932,665 km (0.117 R)
• M42: 7,052,193 km (0.062 R)
• M43: 7,238,293 km (0.064 R)
• M44: 7,448,328 km (0.101 R)
• M45: 7,604,359 km (0.097 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.66 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 210.6

Radius: 11.8

Gravity: 1.51 G

Time & Orbit

Eccentricity (e): 0.026

Orbit Range: 1.62 AU - 1.7 AU

Year: 1451 Days

Day: 6.4 Hours

Environment

Temp: -190 °C

Axial Tilt: 13 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (52)

Outer Limit: 80,802,477 km

• M1: 149,897 km (0.117 R)
• M2: 242,049 km (0.103 R)
• M3: 368,310 km (0.088 R)
• M4: 480,508 km (0.034 R)
• M5: 582,534 km (0.092 R)
• M6: 682,765 km (0.091 R)
• M7: 862,881 km (0.113 R)
• M8: 962,064 km (0.104 R)
• M9: 1,271,283 km (0.059 R)
• M10: 1,476,232 km (0.097 R)
• M11: 1,568,683 km (0.077 R)
• M12: 1,722,021 km (0.08 R)
• M13: 1,981,424 km (0.113 R)
• M14: 2,131,919 km (0.082 R)
• M15: 2,253,542 km (0.104 R)
• M16: 2,327,593 km (0.119 R)
• M17: 2,529,401 km (0.094 R)
• M18: 2,968,321 km (0.118 R)
• M19: 3,187,631 km (0.111 R)
• M20: 3,346,205 km (0.06 R)
• M21: 3,421,902 km (0.102 R)
• M22: 3,498,047 km (0.091 R)
• M23: 3,584,365 km (0.097 R)
• M24: 3,729,924 km (0.071 R)
• M25: 3,808,463 km (0.051 R)
• M26: 4,087,463 km (0.112 R)
• M27: 4,424,955 km (0.109 R)
• M28: 4,686,752 km (0.086 R)
• M29: 5,127,168 km (0.116 R)
• M30: 5,670,956 km (0.12 R)
• M31: 5,772,982 km (0.113 R)
• M32: 5,955,641 km (0.098 R)
• M33: 6,059,312 km (0.029 R)
• M34: 6,175,101 km (0.108 R)
• M35: 6,279,969 km (0.054 R)
• M36: 6,432,559 km (0.078 R)
• M37: 6,515,286 km (0.058 R)
• M38: 6,598,313 km (0.104 R)
• M39: 6,729,511 km (0.109 R)
• M40: 6,922,043 km (0.11 R)
• M41: 7,018,833 km (0.083 R)
• M42: 7,116,221 km (0.102 R)
• M43: 7,226,325 km (0.097 R)
• M44: 7,448,179 km (0.092 R)
• M45: 7,622,311 km (0.12 R)
• M46: 7,697,409 km (0.102 R)
• M47: 8,101,772 km (0.11 R)
• M48: 8,178,366 km (0.037 R)
• M49: 8,383,913 km (0.066 R)
• M50: 8,552,211 km (0.082 R)
• M51: 8,643,167 km (0.069 R)
• M52: 8,800,095 km (0.109 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.85 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 598.2

Radius: 12.9

Gravity: 3.59 G

Time & Orbit

Eccentricity (e): 0.245

Orbit Range: 1.4 AU - 2.3 AU

Year: 1707 Days

Day: 10.2 Hours

Environment

Temp: -206 °C

Axial Tilt: 47.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 80,802,477 km

• M1: 183,557 km (0.078 R)
• M2: 271,969 km (0.059 R)
• M3: 413,040 km (0.087 R)
• M4: 499,657 km (0.047 R)
• M5: 581,487 km (0.118 R)
• M6: 732,581 km (0.051 R)
• M7: 813,663 km (0.1 R)
• M8: 898,335 km (0.041 R)
• M9: 1,085,931 km (0.116 R)
• M10: 1,171,950 km (0.05 R)
• M11: 1,305,541 km (0.109 R)
• M12: 1,388,268 km (0.064 R)
• M13: 1,809,237 km (0.066 R)
• M14: 2,083,150 km (0.103 R)
• M15: 2,359,458 km (0.09 R)
• M16: 2,507,859 km (0.077 R)
• M17: 2,612,577 km (0.101 R)
• M18: 2,766,364 km (0.095 R)
• M19: 2,972,210 km (0.117 R)
• M20: 3,108,195 km (0.098 R)
• M21: 3,271,556 km (0.098 R)
• M22: 3,360,716 km (0.072 R)
• M23: 3,489,670 km (0.114 R)
• M24: 3,659,613 km (0.082 R)
• M25: 3,872,790 km (0.078 R)
• M26: 4,076,392 km (0.046 R)
• M27: 4,186,347 km (0.095 R)
• M28: 4,853,105 km (0.094 R)
• M29: 4,940,619 km (0.046 R)
• M30: 5,251,184 km (0.119 R)
• M31: 5,583,441 km (0.096 R)
• M32: 5,767,596 km (0.108 R)
• M33: 5,907,022 km (0.1 R)
• M34: 6,063,351 km (0.114 R)
• M35: 6,173,605 km (0.109 R)
• M36: 6,300,314 km (0.118 R)
• M37: 6,428,071 km (0.081 R)
• M38: 6,556,575 km (0.118 R)
• M39: 6,865,495 km (0.071 R)
• M40: 7,013,447 km (0.098 R)
• M41: 7,145,841 km (0.103 R)
• M42: 7,312,494 km (0.092 R)
• M43: 7,632,932 km (0.059 R)
• M44: 7,957,859 km (0.076 R)
• M45: 8,148,147 km (0.119 R)
• M46: 8,799,197 km (0.061 R)
• M47: 8,995,918 km (0.107 R)
• M48: 9,176,184 km (0.119 R)
• M49: 9,503,504 km (0.11 R)
• M50: 9,890,364 km (0.077 R)
• M51: 10,076,314 km (0.069 R)
• M52: 10,169,813 km (0.092 R)
• M53: 10,679,493 km (0.102 R)
• M54: 10,793,935 km (0.044 R)
• M55: 10,927,975 km (0.113 R)
• M56: 11,488,967 km (0.064 R)
• M57: 11,704,238 km (0.075 R)
• M58: 11,822,271 km (0.068 R)
• M59: 11,920,856 km (0.098 R)
• M60: 12,019,740 km (0.097 R)
• M61: 12,278,245 km (0.117 R)
• M62: 12,598,833 km (0.076 R)
• M63: 12,719,858 km (0.074 R)
• M64: 12,841,182 km (0.083 R)
• M65: 13,909,012 km (0.068 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.28 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 994.7

Radius: 8.1

Gravity: 15.16 G

Time & Orbit

Eccentricity (e): 0.247

Orbit Range: 3.22 AU - 5.34 AU

Year: 6006 Days

Day: 5.9 Hours

Environment

Temp: -220 °C

Axial Tilt: 34.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 80,802,477 km

• M1: 110,553 km (0.106 R)
• M2: 262,245 km (0.077 R)
• M3: 363,972 km (0.112 R)
• M4: 432,487 km (0.05 R)
• M5: 892,202 km (0.034 R)
• M6: 1,282,951 km (0.098 R)
• M7: 1,356,105 km (0.084 R)
• M8: 2,272,691 km (0.084 R)
• M9: 2,361,851 km (0.111 R)
• M10: 2,707,123 km (0.064 R)
• M11: 2,778,032 km (0.034 R)
• M12: 3,216,953 km (0.112 R)
• M13: 3,703,744 km (0.109 R)
• M14: 3,835,839 km (0.095 R)
• M15: 4,407,004 km (0.09 R)
• M16: 4,518,903 km (0.043 R)
• M17: 4,716,821 km (0.096 R)
• M18: 5,209,746 km (0.086 R)
• M19: 5,507,296 km (0.106 R)
• M20: 5,933,201 km (0.094 R)
• M21: 6,369,728 km (0.113 R)
• M22: 6,719,936 km (0.091 R)
• M23: 6,881,352 km (0.066 R)
• M24: 7,240,687 km (0.105 R)
• M25: 8,114,488 km (0.098 R)
• M26: 8,389,897 km (0.04 R)
• M27: 8,668,598 km (0.112 R)
• M28: 9,127,864 km (0.083 R)
• M29: 11,042,716 km (0.06 R)
• M30: 11,156,860 km (0.101 R)
• M31: 11,348,046 km (0.051 R)
• M32: 11,811,350 km (0.12 R)
• M33: 12,202,100 km (0.025 R)
• M34: 12,438,614 km (0.103 R)
• M35: 13,036,557 km (0.11 R)
• M36: 13,278,307 km (0.068 R)
• M37: 13,971,394 km (0.059 R)
• M38: 14,343,145 km (0.111 R)
• M39: 14,426,171 km (0.068 R)
• M40: 14,927,773 km (0.079 R)
• M41: 15,435,209 km (0.09 R)
• M42: 16,034,199 km (0.052 R)
• M43: 16,250,069 km (0.068 R)
• M44: 16,947,045 km (0.067 R)
• M45: 17,387,611 km (0.1 R)
• M46: 17,742,906 km (0.118 R)
• M47: 18,370,170 km (0.098 R)
• M48: 18,505,556 km (0.075 R)
• M49: 18,959,286 km (0.099 R)
• M50: 19,050,541 km (0.088 R)
• M51: 20,202,444 km (0.069 R)
• M52: 22,092,165 km (0.095 R)
• M53: 22,380,440 km (0.066 R)
• M54: 23,546,106 km (0.069 R)
• M55: 23,889,882 km (0.119 R)
• M56: 24,284,671 km (0.081 R)
• M57: 24,831,152 km (0.071 R)
• M58: 24,930,934 km (0.083 R)
• M59: 25,130,946 km (0.106 R)
• M60: 25,281,143 km (0.065 R)
• M61: 25,633,146 km (0.114 R)
• M62: 25,784,539 km (0.083 R)
• M63: 25,885,518 km (0.113 R)
• M64: 26,088,073 km (0.072 R)
• M65: 26,138,787 km (0.096 R)
• M66: 27,005,707 km (0.025 R)
• M67: 28,977,706 km (0.082 R)
• M68: 29,981,059 km (0.11 R)
• M69: 30,781,108 km (0.112 R)
• M70: 31,642,343 km (0.103 R)
• M71: 31,696,348 km (0.088 R)
• M72: 31,858,811 km (0.089 R)
• M73: 31,967,270 km (0.116 R)
• M74: 32,238,940 km (0.113 R)
• M75: 32,402,300 km (0.103 R)
• M76: 32,894,029 km (0.03 R)
• M77: 33,719,210 km (0.103 R)
• M78: 33,774,412 km (0.072 R)
• M79: 34,273,022 km (0.085 R)
• M80: 34,439,823 km (0.06 R)
• M81: 36,404,941 km (0.112 R)
• M82: 37,201,101 km (0.072 R)
• M83: 37,372,540 km (0.105 R)
• M84: 37,830,758 km (0.032 R)
• M85: 37,888,204 km (0.101 R)
• M86: 38,290,921 km (0.091 R)
• M87: 38,463,857 km (0.051 R)
• M88: 38,579,346 km (0.1 R)

Planet 5 - Ice Giant

Semi-Major Axis: 6.31 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 856.6

Radius: 3

Gravity: 95.18 G

Time & Orbit

Eccentricity (e): 0.04

Orbit Range: 6.06 AU - 6.56 AU

Year: 10751 Days

Day: 24.1 Hours

Environment

Temp: -226 °C

Axial Tilt: 47.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 80,802,477 km

• M1: 264,339 km (0.105 R)
• M2: 486,941 km (0.11 R)
• M3: 774,319 km (0.12 R)
• M4: 873,352 km (0.098 R)
• M5: 1,040,304 km (0.113 R)
• M6: 1,171,950 km (0.078 R)
• M7: 1,217,128 km (0.102 R)
• M8: 1,332,319 km (0.083 R)
• M9: 1,475,185 km (0.051 R)
• M10: 1,648,120 km (0.07 R)
• M11: 1,827,488 km (0.108 R)
• M12: 2,753,498 km (0.091 R)
• M13: 3,058,528 km (0.106 R)
• M14: 3,120,761 km (0.07 R)
• M15: 3,246,723 km (0.106 R)
• M16: 3,934,274 km (0.074 R)
• M17: 4,381,572 km (0.051 R)
• M18: 5,249,090 km (0.107 R)
• M19: 5,436,237 km (0.11 R)
• M20: 5,625,778 km (0.07 R)
• M21: 7,300,077 km (0.108 R)
• M22: 7,551,102 km (0.114 R)
• M23: 7,762,334 km (0.086 R)
• M24: 8,364,017 km (0.096 R)
• M25: 8,891,798 km (0.115 R)
• M26: 9,430,051 km (0.068 R)
• M27: 9,748,994 km (0.112 R)
• M28: 9,978,926 km (0.054 R)
• M29: 11,059,471 km (0.088 R)
• M30: 11,203,235 km (0.063 R)
• M31: 11,395,618 km (0.118 R)
• M32: 11,783,974 km (0.099 R)
• M33: 12,028,866 km (0.072 R)
• M34: 12,226,036 km (0.086 R)
• M35: 13,075,602 km (0.071 R)
• M36: 14,411,361 km (0.091 R)
• M37: 14,725,666 km (0.108 R)
• M38: 15,148,430 km (0.078 R)
• M39: 16,005,626 km (0.102 R)
• M40: 16,059,780 km (0.107 R)
• M41: 16,494,661 km (0.069 R)
• M42: 17,099,186 km (0.081 R)
• M43: 17,209,739 km (0.05 R)
• M44: 20,992,620 km (0.061 R)
• M45: 21,408,353 km (0.054 R)
• M46: 21,707,100 km (0.053 R)
• M47: 22,308,334 km (0.055 R)
• M48: 22,976,139 km (0.094 R)
• M49: 23,281,917 km (0.101 R)
• M50: 23,343,252 km (0.102 R)
• M51: 24,021,080 km (0.099 R)
• M52: 26,476,130 km (0.095 R)
• M53: 26,796,569 km (0.1 R)
• M54: 27,247,307 km (0.027 R)
• M55: 27,311,934 km (0.088 R)
• M56: 28,156,414 km (0.092 R)
• M57: 28,746,128 km (0.091 R)
• M58: 29,273,760 km (0.081 R)
• M59: 29,339,882 km (0.103 R)
• M60: 29,605,119 km (0.07 R)
• M61: 30,071,117 km (0.11 R)
• M62: 31,483,470 km (0.11 R)
• M63: 31,551,238 km (0.081 R)
• M64: 32,917,366 km (0.099 R)
• M65: 34,721,965 km (0.117 R)
• M66: 36,487,070 km (0.096 R)
• M67: 37,129,743 km (0.041 R)
• M68: 39,663,931 km (0.101 R)
• M69: 39,737,234 km (0.11 R)
• M70: 39,810,537 km (0.049 R)
• M71: 40,251,102 km (0.096 R)
• M72: 41,805,723 km (0.069 R)
• M73: 43,153,750 km (0.078 R)
• M74: 43,606,283 km (0.06 R)
• M75: 43,681,980 km (0.045 R)
• M76: 43,984,616 km (0.044 R)
• M77: 45,279,087 km (0.062 R)
• M78: 45,508,719 km (0.07 R)
• M79: 45,662,057 km (0.104 R)
• M80: 46,200,161 km (0.071 R)
• M81: 47,127,518 km (0.084 R)
• M82: 47,749,247 km (0.08 R)
• M83: 48,608,387 km (0.09 R)
• M84: 48,843,705 km (0.058 R)
• M85: 50,262,790 km (0.119 R)
• M86: 50,977,569 km (0.109 R)
• M87: 51,375,948 km (0.082 R)
• M88: 51,455,833 km (0.105 R)
• M89: 52,819,119 km (0.089 R)
• M90: 53,303,068 km (0.063 R)
• M91: 53,545,566 km (0.073 R)
• M92: 54,112,991 km (0.116 R)
• M93: 54,194,222 km (0.08 R)

Planet 6 - Ice Giant

Semi-Major Axis: 10.54 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 609.2

Radius: 3.9

Gravity: 40.05 G

Time & Orbit

Eccentricity (e): 0

Orbit Range: 10.54 AU - 10.54 AU

Year: 23209 Days

Day: 16.9 Hours

Environment

Temp: -232 °C

Axial Tilt: 36.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (90)

Outer Limit: 80,802,477 km

• M1: 129,253 km (0.1 R)
• M2: 211,980 km (0.049 R)
• M3: 260,001 km (0.093 R)
• M4: 330,163 km (0.116 R)
• M5: 897,737 km (0.077 R)
• M6: 1,544,149 km (0.107 R)
• M7: 2,014,485 km (0.11 R)
• M8: 2,120,699 km (0.109 R)
• M9: 2,488,112 km (0.095 R)
• M10: 2,756,939 km (0.041 R)
• M11: 2,954,558 km (0.071 R)
• M12: 3,405,446 km (0.095 R)
• M13: 4,009,672 km (0.107 R)
• M14: 4,278,649 km (0.077 R)
• M15: 5,909,714 km (0.118 R)
• M16: 5,960,278 km (0.074 R)
• M17: 6,789,350 km (0.088 R)
• M18: 7,002,228 km (0.109 R)
• M19: 8,840,037 km (0.108 R)
• M20: 9,189,348 km (0.118 R)
• M21: 9,901,434 km (0.115 R)
• M22: 11,064,707 km (0.087 R)
• M23: 11,757,645 km (0.052 R)
• M24: 12,529,570 km (0.091 R)
• M25: 13,251,379 km (0.116 R)
• M26: 13,317,801 km (0.064 R)
• M27: 16,128,894 km (0.114 R)
• M28: 18,296,867 km (0.091 R)
• M29: 18,518,720 km (0.11 R)
• M30: 18,592,771 km (0.12 R)
• M31: 18,741,322 km (0.111 R)
• M32: 19,189,368 km (0.115 R)
• M33: 20,095,931 km (0.054 R)
• M34: 20,172,076 km (0.113 R)
• M35: 20,401,260 km (0.115 R)
• M36: 21,481,805 km (0.093 R)
• M37: 21,637,686 km (0.052 R)
• M38: 25,572,110 km (0.093 R)
• M39: 27,408,574 km (0.046 R)
• M40: 28,856,681 km (0.096 R)
• M41: 30,416,837 km (0.092 R)
• M42: 30,942,973 km (0.079 R)
• M43: 31,030,937 km (0.08 R)
• M44: 31,471,951 km (0.081 R)
• M45: 31,560,513 km (0.116 R)
• M46: 32,004,071 km (0.105 R)
• M47: 32,360,413 km (0.086 R)
• M48: 33,980,408 km (0.116 R)
• M49: 34,983,312 km (0.096 R)
• M50: 35,995,791 km (0.051 R)
• M51: 36,831,445 km (0.066 R)
• M52: 37,017,993 km (0.11 R)
• M53: 37,204,841 km (0.106 R)
• M54: 38,143,867 km (0.107 R)
• M55: 38,805,837 km (0.117 R)
• M56: 44,335,423 km (0.093 R)
• M57: 44,434,607 km (0.074 R)
• M58: 44,732,606 km (0.079 R)
• M59: 45,931,333 km (0.096 R)
• M60: 47,545,943 km (0.089 R)
• M61: 47,647,371 km (0.068 R)
• M62: 47,850,674 km (0.088 R)
• M63: 48,564,406 km (0.091 R)
• M64: 48,871,380 km (0.073 R)
• M65: 50,105,563 km (0.107 R)
• M66: 50,726,544 km (0.056 R)
• M67: 51,038,006 km (0.104 R)
• M68: 52,394,859 km (0.1 R)
• M69: 52,604,745 km (0.109 R)
• M70: 53,235,749 km (0.107 R)
• M71: 53,446,682 km (0.085 R)
• M72: 54,611,750 km (0.105 R)
• M73: 55,357,495 km (0.086 R)
• M74: 58,048,163 km (0.081 R)
• M75: 59,573,462 km (0.045 R)
• M76: 60,341,049 km (0.089 R)
• M77: 61,111,927 km (0.096 R)
• M78: 61,996,948 km (0.096 R)
• M79: 64,339,950 km (0.064 R)
• M80: 65,127,433 km (0.105 R)
• M81: 65,353,027 km (0.101 R)
• M82: 67,965,753 km (0.049 R)
• M83: 69,572,883 km (0.041 R)
• M84: 72,473,436 km (0.207 R)
• M85: 72,824,243 km (0.043 R)
• M86: 73,997,390 km (0.059 R)
• M87: 76,124,672 km (0.101 R)
• M88: 78,032,493 km (0.111 R)
• M89: 78,272,149 km (0.074 R)
• M90: 78,752,059 km (0.094 R)

Kuiper Belt

Range: 30 - 47 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 533 - 11,960 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit