🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.32 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.64 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 572.5

Radius: 8

Gravity: 8.95 G

Time & Orbit

Eccentricity (e): 0.141

Orbit Range: 0.55 AU - 0.73 AU

Year: 347 Days

Day: 14.4 Hours

Environment

Temp: -147 °C

Axial Tilt: 9.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (43)

Outer Limit: 61,954,898 km

• M1: 103,522 km (0.118 R)
• M2: 190,438 km (0.063 R)
• M3: 250,576 km (0.116 R)
• M4: 302,487 km (0.079 R)
• M5: 367,412 km (0.092 R)
• M6: 426,504 km (0.042 R)
• M7: 565,330 km (0.117 R)
• M8: 656,286 km (0.114 R)
• M9: 748,737 km (0.032 R)
• M10: 826,827 km (0.104 R)
• M11: 931,546 km (0.104 R)
• M12: 1,053,169 km (0.112 R)
• M13: 1,180,327 km (0.041 R)
• M14: 1,245,701 km (0.094 R)
• M15: 1,335,011 km (0.111 R)
• M16: 1,385,127 km (0.094 R)
• M17: 1,506,002 km (0.094 R)
• M18: 1,625,680 km (0.11 R)
• M19: 1,679,236 km (0.113 R)
• M20: 1,798,466 km (0.078 R)
• M21: 2,108,881 km (0.104 R)
• M22: 2,194,451 km (0.083 R)
• M23: 2,336,270 km (0.074 R)
• M24: 2,509,205 km (0.118 R)
• M25: 2,577,272 km (0.105 R)
• M26: 2,680,495 km (0.043 R)
• M27: 2,732,704 km (0.106 R)
• M28: 2,802,866 km (0.098 R)
• M29: 2,909,080 km (0.117 R)
• M30: 2,974,754 km (0.06 R)
• M31: 3,156,365 km (0.074 R)
• M32: 3,248,518 km (0.118 R)
• M33: 3,511,361 km (0.117 R)
• M34: 3,645,401 km (0.082 R)
• M35: 3,703,445 km (0.063 R)
• M36: 3,833,296 km (0.119 R)
• M37: 3,925,149 km (0.119 R)
• M38: 3,991,271 km (0.049 R)
• M39: 4,084,471 km (0.089 R)
• M40: 4,198,464 km (0.037 R)
• M41: 4,574,852 km (0.088 R)
• M42: 4,630,503 km (0.039 R)
• M43: 4,791,769 km (0.104 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.88 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 609.9

Radius: 8.6

Gravity: 8.25 G

Time & Orbit

Eccentricity (e): 0.013

Orbit Range: 0.87 AU - 0.89 AU

Year: 560 Days

Day: 9 Hours

Environment

Temp: -163 °C

Axial Tilt: 34.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 61,954,898 km

• M1: 108,608 km (0.102 R)
• M2: 174,581 km (0.087 R)
• M3: 268,678 km (0.057 R)
• M4: 333,005 km (0.095 R)
• M5: 386,561 km (0.059 R)
• M6: 462,407 km (0.118 R)
• M7: 528,080 km (0.103 R)
• M8: 593,156 km (0.06 R)
• M9: 648,357 km (0.09 R)
• M10: 778,358 km (0.101 R)
• M11: 1,028,485 km (0.104 R)
• M12: 1,085,781 km (0.118 R)
• M13: 1,275,621 km (0.069 R)
• M14: 1,348,924 km (0.116 R)
• M15: 1,488,200 km (0.049 R)
• M16: 1,650,513 km (0.112 R)
• M17: 1,755,830 km (0.078 R)
• M18: 1,850,675 km (0.111 R)
• M19: 1,979,778 km (0.103 R)
• M20: 2,052,034 km (0.109 R)
• M21: 2,112,023 km (0.068 R)
• M22: 2,206,269 km (0.107 R)
• M23: 2,322,657 km (0.049 R)
• M24: 2,378,157 km (0.081 R)
• M25: 2,504,717 km (0.075 R)
• M26: 2,568,895 km (0.095 R)
• M27: 2,676,904 km (0.053 R)
• M28: 2,779,229 km (0.116 R)
• M29: 2,987,918 km (0.119 R)
• M30: 3,048,356 km (0.095 R)
• M31: 3,140,059 km (0.045 R)
• M32: 3,459,900 km (0.117 R)
• M33: 3,652,133 km (0.118 R)
• M34: 4,005,184 km (0.042 R)
• M35: 4,156,278 km (0.088 R)
• M36: 4,232,573 km (0.11 R)
• M37: 4,691,240 km (0.071 R)
• M38: 4,886,315 km (0.045 R)
• M39: 5,002,852 km (0.096 R)
• M40: 5,102,185 km (0.091 R)
• M41: 5,394,948 km (0.115 R)
• M42: 5,468,849 km (0.118 R)
• M43: 5,533,924 km (0.118 R)
• M44: 5,655,548 km (0.097 R)
• M45: 5,787,343 km (0.093 R)
• M46: 5,844,190 km (0.094 R)
• M47: 5,939,335 km (0.076 R)
• M48: 5,996,780 km (0.115 R)
• M49: 6,063,800 km (0.097 R)
• M50: 6,160,141 km (0.119 R)
• M51: 6,325,148 km (0.086 R)
• M52: 6,413,111 km (0.114 R)
• M53: 6,580,212 km (0.078 R)
• M54: 6,639,602 km (0.074 R)
• M55: 6,728,912 km (0.082 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.97 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 783.6

Radius: 8.2

Gravity: 11.65 G

Time & Orbit

Eccentricity (e): 0.099

Orbit Range: 0.87 AU - 1.07 AU

Year: 648 Days

Day: 9.9 Hours

Environment

Temp: -175 °C

Axial Tilt: 24.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (59)

Outer Limit: 61,954,898 km

• M1: 102,175 km (0.091 R)
• M2: 163,510 km (0.101 R)
• M3: 343,178 km (0.089 R)
• M4: 484,996 km (0.075 R)
• M5: 637,137 km (0.061 R)
• M6: 742,604 km (0.099 R)
• M7: 810,820 km (0.09 R)
• M8: 948,600 km (0.11 R)
• M9: 1,082,191 km (0.065 R)
• M10: 1,191,248 km (0.112 R)
• M11: 1,433,896 km (0.072 R)
• M12: 1,513,781 km (0.069 R)
• M13: 1,650,214 km (0.091 R)
• M14: 1,727,107 km (0.088 R)
• M15: 1,841,251 km (0.119 R)
• M16: 1,913,806 km (0.104 R)
• M17: 2,252,196 km (0.096 R)
• M18: 2,322,208 km (0.092 R)
• M19: 2,432,611 km (0.063 R)
• M20: 2,496,489 km (0.073 R)
• M21: 2,593,279 km (0.047 R)
• M22: 2,757,538 km (0.059 R)
• M23: 3,148,287 km (0.073 R)
• M24: 3,620,119 km (0.111 R)
• M25: 3,702,398 km (0.028 R)
• M26: 3,897,025 km (0.038 R)
• M27: 4,219,258 km (0.109 R)
• M28: 4,306,025 km (0.089 R)
• M29: 4,471,480 km (0.115 R)
• M30: 4,569,766 km (0.055 R)
• M31: 4,629,157 km (0.104 R)
• M32: 4,708,743 km (0.1 R)
• M33: 4,838,893 km (0.091 R)
• M34: 5,133,750 km (0.117 R)
• M35: 5,205,856 km (0.103 R)
• M36: 5,319,700 km (0.119 R)
• M37: 5,434,442 km (0.092 R)
• M38: 5,528,988 km (0.095 R)
• M39: 5,581,646 km (0.113 R)
• M40: 5,698,332 km (0.091 R)
• M41: 5,890,865 km (0.115 R)
• M42: 5,944,870 km (0.076 R)
• M43: 5,998,875 km (0.087 R)
• M44: 6,140,095 km (0.12 R)
• M45: 6,194,848 km (0.099 R)
• M46: 6,282,512 km (0.047 R)
• M47: 6,337,714 km (0.097 R)
• M48: 6,403,986 km (0.111 R)
• M49: 6,481,627 km (0.064 R)
• M50: 6,727,715 km (0.079 R)
• M51: 6,795,334 km (0.06 R)
• M52: 6,863,251 km (0.112 R)
• M53: 7,079,570 km (0.095 R)
• M54: 7,240,537 km (0.085 R)
• M55: 7,321,469 km (0.118 R)
• M56: 7,519,238 km (0.116 R)
• M57: 7,754,256 km (0.111 R)
• M58: 7,931,978 km (0.116 R)
• M59: 8,063,325 km (0.109 R)

Planet 4 - Gas Giant

Semi-Major Axis: 0.97 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 34.8

Radius: 9.6

Gravity: 0.38 G

Time & Orbit

Eccentricity (e): 0.006

Orbit Range: 0.96 AU - 0.98 AU

Year: 648 Days

Day: 10.5 Hours

Environment

Temp: -181 °C

Axial Tilt: 5.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (27)

Outer Limit: 61,954,898 km

• M1: 119,828 km (0.104 R)
• M2: 188,643 km (0.066 R)
• M3: 257,009 km (0.038 R)
• M4: 341,382 km (0.072 R)
• M5: 412,292 km (0.085 R)
• M6: 487,390 km (0.092 R)
• M7: 613,950 km (0.062 R)
• M8: 719,566 km (0.072 R)
• M9: 811,120 km (0.104 R)
• M10: 887,863 km (0.029 R)
• M11: 975,677 km (0.117 R)
• M12: 1,089,671 km (0.101 R)
• M13: 1,151,455 km (0.045 R)
• M14: 1,266,496 km (0.106 R)
• M15: 1,465,760 km (0.077 R)
• M16: 1,661,733 km (0.05 R)
• M17: 1,733,690 km (0.113 R)
• M18: 1,834,668 km (0.052 R)
• M19: 1,901,987 km (0.107 R)
• M20: 2,006,407 km (0.077 R)
• M21: 2,101,700 km (0.073 R)
• M22: 2,258,778 km (0.114 R)
• M23: 2,335,073 km (0.066 R)
• M24: 2,470,459 km (0.104 R)
• M25: 2,565,005 km (0.1 R)
• M26: 2,676,755 km (0.11 R)
• M27: 2,847,446 km (0.088 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.64 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 246.6

Radius: 8.8

Gravity: 3.18 G

Time & Orbit

Eccentricity (e): 0.179

Orbit Range: 2.17 AU - 3.11 AU

Year: 2909 Days

Day: 8.2 Hours

Environment

Temp: -205 °C

Axial Tilt: 23.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (69)

Outer Limit: 61,954,898 km

• M1: 110,702 km (0.055 R)
• M2: 210,933 km (0.113 R)
• M3: 265,686 km (0.053 R)
• M4: 338,839 km (0.079 R)
• M5: 433,235 km (0.08 R)
• M6: 888,013 km (0.064 R)
• M7: 955,631 km (0.066 R)
• M8: 1,096,552 km (0.057 R)
• M9: 1,188,106 km (0.116 R)
• M10: 1,359,845 km (0.094 R)
• M11: 1,428,809 km (0.119 R)
• M12: 1,488,948 km (0.113 R)
• M13: 1,580,801 km (0.119 R)
• M14: 1,748,799 km (0.106 R)
• M15: 2,023,162 km (0.082 R)
• M16: 2,159,894 km (0.112 R)
• M17: 2,276,132 km (0.052 R)
• M18: 2,335,073 km (0.107 R)
• M19: 2,394,464 km (0.079 R)
• M20: 2,563,808 km (0.05 R)
• M21: 2,711,910 km (0.105 R)
• M22: 3,121,060 km (0.118 R)
• M23: 3,253,006 km (0.117 R)
• M24: 3,440,751 km (0.108 R)
• M25: 3,536,045 km (0.114 R)
• M26: 3,618,324 km (0.116 R)
• M27: 3,701,351 km (0.097 R)
• M28: 3,827,013 km (0.093 R)
• M29: 3,968,383 km (0.076 R)
• M30: 4,039,741 km (0.092 R)
• M31: 4,595,796 km (0.079 R)
• M32: 4,731,033 km (0.112 R)
• M33: 4,959,469 km (0.097 R)
• M34: 5,067,329 km (0.103 R)
• M35: 5,191,495 km (0.089 R)
• M36: 5,348,273 km (0.113 R)
• M37: 5,586,134 km (0.084 R)
• M38: 5,666,319 km (0.055 R)
• M39: 6,072,626 km (0.066 R)
• M40: 6,237,782 km (0.081 R)
• M41: 6,304,353 km (0.088 R)
• M42: 6,606,392 km (0.099 R)
• M43: 6,776,335 km (0.064 R)
• M44: 6,861,905 km (0.118 R)
• M45: 7,312,344 km (0.117 R)
• M46: 7,382,505 km (0.104 R)
• M47: 7,844,015 km (0.076 R)
• M48: 8,498,505 km (0.104 R)
• M49: 9,646,968 km (0.113 R)
• M50: 9,898,143 km (0.049 R)
• M51: 10,131,815 km (0.119 R)
• M52: 10,367,282 km (0.081 R)
• M53: 10,426,373 km (0.119 R)
• M54: 10,923,786 km (0.097 R)
• M55: 10,984,074 km (0.097 R)
• M56: 11,205,778 km (0.117 R)
• M57: 11,367,942 km (0.083 R)
• M58: 11,653,674 km (0.06 R)
• M59: 11,756,298 km (0.112 R)
• M60: 11,838,577 km (0.114 R)
• M61: 11,941,800 km (0.114 R)
• M62: 12,128,199 km (0.041 R)
• M63: 13,160,125 km (0.095 R)
• M64: 13,245,545 km (0.117 R)
• M65: 13,460,068 km (0.106 R)
• M66: 13,546,237 km (0.069 R)
• M67: 14,373,663 km (0.105 R)
• M68: 14,483,767 km (0.117 R)
• M69: 14,638,301 km (0.112 R)

Planet 6 - Gas Giant

Semi-Major Axis: 3.51 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 325.7

Radius: 10.6

Gravity: 2.9 G

Time & Orbit

Eccentricity (e): 0.134

Orbit Range: 3.04 AU - 3.98 AU

Year: 4460 Days

Day: 11.1 Hours

Environment

Temp: -223 °C

Axial Tilt: 11.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (73)

Outer Limit: 61,954,898 km

• M1: 222,901 km (0.097 R)
• M2: 318,643 km (0.04 R)
• M3: 404,213 km (0.078 R)
• M4: 525,238 km (0.103 R)
• M5: 604,675 km (0.091 R)
• M6: 838,945 km (0.048 R)
• M7: 956,379 km (0.05 R)
• M8: 1,045,540 km (0.084 R)
• M9: 1,208,601 km (0.037 R)
• M10: 1,547,291 km (0.059 R)
• M11: 1,613,263 km (0.078 R)
• M12: 1,707,360 km (0.101 R)
• M13: 1,887,177 km (0.118 R)
• M14: 1,972,448 km (0.106 R)
• M15: 2,131,919 km (0.095 R)
• M16: 2,464,027 km (0.1 R)
• M17: 2,620,506 km (0.044 R)
• M18: 2,748,262 km (0.086 R)
• M19: 3,228,172 km (0.117 R)
• M20: 3,382,557 km (0.064 R)
• M21: 3,521,983 km (0.086 R)
• M22: 3,627,599 km (0.104 R)
• M23: 3,734,561 km (0.097 R)
• M24: 4,006,231 km (0.085 R)
• M25: 4,569,018 km (0.095 R)
• M26: 4,977,869 km (0.046 R)
• M27: 5,317,456 km (0.112 R)
• M28: 5,706,112 km (0.068 R)
• M29: 6,019,370 km (0.07 R)
• M30: 6,274,135 km (0.113 R)
• M31: 6,381,247 km (0.08 R)
• M32: 6,467,565 km (0.065 R)
• M33: 6,597,565 km (0.108 R)
• M34: 6,970,662 km (0.097 R)
• M35: 7,081,814 km (0.115 R)
• M36: 7,350,791 km (0.103 R)
• M37: 7,463,887 km (0.068 R)
• M38: 7,554,842 km (0.089 R)
• M39: 7,829,653 km (0.086 R)
• M40: 8,038,043 km (0.053 R)
• M41: 8,745,791 km (0.11 R)
• M42: 9,424,367 km (0.081 R)
• M43: 9,621,387 km (0.078 R)
• M44: 10,170,262 km (0.031 R)
• M45: 10,296,373 km (0.063 R)
• M46: 10,448,514 km (0.071 R)
• M47: 10,575,821 km (0.08 R)
• M48: 10,652,416 km (0.117 R)
• M49: 10,960,886 km (0.096 R)
• M50: 11,090,289 km (0.106 R)
• M51: 12,090,051 km (0.076 R)
• M52: 12,492,769 km (0.09 R)
• M53: 14,203,271 km (0.101 R)
• M54: 14,429,313 km (0.102 R)
• M55: 14,942,284 km (0.062 R)
• M56: 15,548,305 km (0.07 R)
• M57: 16,457,561 km (0.11 R)
• M58: 16,724,743 km (0.072 R)
• M59: 17,173,387 km (0.115 R)
• M60: 17,323,733 km (0.12 R)
• M61: 17,625,920 km (0.066 R)
• M62: 17,899,385 km (0.08 R)
• M63: 18,789,941 km (0.117 R)
• M64: 19,038,124 km (0.107 R)
• M65: 19,789,255 km (0.113 R)
• M66: 20,010,211 km (0.088 R)
• M67: 20,168,486 km (0.06 R)
• M68: 20,295,494 km (0.108 R)
• M69: 20,422,653 km (0.077 R)
• M70: 20,646,002 km (0.079 R)
• M71: 20,805,922 km (0.109 R)
• M72: 20,934,277 km (0.091 R)
• M73: 21,094,945 km (0.072 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.85 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 664.7

Radius: 6.8

Gravity: 14.38 G

Time & Orbit

Eccentricity (e): 0.058

Orbit Range: 7.39 AU - 8.31 AU

Year: 14917 Days

Day: 23.3 Hours

Environment

Temp: -229 °C

Axial Tilt: 34.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (97)

Outer Limit: 61,954,898 km

• M1: 155,881 km (0.082 R)
• M2: 300,393 km (0.074 R)
• M3: 617,091 km (0.119 R)
• M4: 1,062,893 km (0.065 R)
• M5: 1,255,126 km (0.09 R)
• M6: 1,380,788 km (0.119 R)
• M7: 1,811,032 km (0.119 R)
• M8: 2,219,733 km (0.057 R)
• M9: 2,434,705 km (0.115 R)
• M10: 2,786,111 km (0.106 R)
• M11: 3,823,572 km (0.085 R)
• M12: 4,081,479 km (0.056 R)
• M13: 4,156,128 km (0.12 R)
• M14: 4,231,376 km (0.08 R)
• M15: 5,249,090 km (0.094 R)
• M16: 5,330,471 km (0.06 R)
• M17: 5,535,570 km (0.083 R)
• M18: 6,166,574 km (0.092 R)
• M19: 6,209,508 km (0.05 R)
• M20: 6,425,378 km (0.102 R)
• M21: 6,468,911 km (0.088 R)
• M22: 7,132,826 km (0.115 R)
• M23: 7,772,058 km (0.097 R)
• M24: 7,818,284 km (0.086 R)
• M25: 8,286,974 km (0.046 R)
• M26: 8,620,428 km (0.119 R)
• M27: 8,668,449 km (0.032 R)
• M28: 8,958,369 km (0.043 R)
• M29: 10,149,468 km (0.049 R)
• M30: 11,389,484 km (0.107 R)
• M31: 11,442,143 km (0.109 R)
• M32: 11,813,295 km (0.107 R)
• M33: 12,080,926 km (0.097 R)
• M34: 12,513,263 km (0.059 R)
• M35: 12,731,228 km (0.1 R)
• M36: 12,840,733 km (0.112 R)
• M37: 13,226,397 km (0.115 R)
• M38: 13,560,149 km (0.089 R)
• M39: 15,327,648 km (0.061 R)
• M40: 15,795,441 km (0.09 R)
• M41: 16,090,149 km (0.076 R)
• M42: 16,267,871 km (0.049 R)
• M43: 17,530,178 km (0.098 R)
• M44: 17,712,986 km (0.093 R)
• M45: 18,019,213 km (0.041 R)
• M46: 18,265,451 km (0.097 R)
• M47: 20,659,765 km (0.117 R)
• M48: 22,090,370 km (0.045 R)
• M49: 23,351,480 km (0.106 R)
• M50: 25,114,790 km (0.118 R)
• M51: 26,081,790 km (0.07 R)
• M52: 26,290,629 km (0.094 R)
• M53: 27,767,758 km (0.03 R)
• M54: 28,194,711 km (0.101 R)
• M55: 28,911,284 km (0.032 R)
• M56: 29,127,304 km (0.093 R)
• M57: 30,508,391 km (0.06 R)
• M58: 30,581,694 km (0.111 R)
• M59: 31,613,770 km (0.095 R)
• M60: 32,432,669 km (0.046 R)
• M61: 32,732,164 km (0.025 R)
• M62: 33,333,996 km (0.082 R)
• M63: 35,007,697 km (0.108 R)
• M64: 35,700,335 km (0.108 R)
• M65: 36,397,312 km (0.1 R)
• M66: 37,883,716 km (0.071 R)
• M67: 38,278,056 km (0.098 R)
• M68: 38,515,318 km (0.12 R)
• M69: 38,911,902 km (0.112 R)
• M70: 39,389,718 km (0.042 R)
• M71: 39,629,224 km (0.088 R)
• M72: 41,563,375 km (0.094 R)
• M73: 41,807,219 km (0.081 R)
• M74: 44,521,523 km (0.103 R)
• M75: 44,771,052 km (0.084 R)
• M76: 45,187,982 km (0.06 R)
• M77: 45,522,482 km (0.114 R)
• M78: 46,278,251 km (0.039 R)
• M79: 46,699,818 km (0.09 R)
• M80: 46,784,340 km (0.114 R)
• M81: 47,461,869 km (0.028 R)
• M82: 47,887,026 km (0.065 R)
• M83: 47,972,297 km (0.03 R)
• M84: 49,170,127 km (0.117 R)
• M85: 49,600,371 km (0.114 R)
• M86: 51,333,612 km (0.081 R)
• M87: 51,508,043 km (0.116 R)
• M88: 53,439,501 km (0.085 R)
• M89: 53,970,424 km (0.09 R)
• M90: 54,147,697 km (0.048 R)
• M91: 58,189,084 km (0.083 R)
• M92: 58,553,055 km (0.056 R)
• M93: 59,924,419 km (0.11 R)
• M94: 60,936,897 km (0.036 R)
• M95: 61,584,058 km (0.108 R)
• M96: 61,676,659 km (0.045 R)
• M97: 61,954,911 km (0.076 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: 412 - 11,782 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit