🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.54 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.19

Radius: 1.77

Gravity: 1.34 G

Time & Orbit

Eccentricity (e): 0.044

Orbit Range: 0.52 AU - 0.56 AU

Year: 256 Days

Day: 30.6 Hours

Environment

Temp: -128 °C

Axial Tilt: 36.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 2 - Gas Giant

Semi-Major Axis: 0.98 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 591.5

Radius: 14.4

Gravity: 2.85 G

Time & Orbit

Eccentricity (e): 0.065

Orbit Range: 0.92 AU - 1.04 AU

Year: 626 Days

Day: 7.9 Hours

Environment

Temp: -167 °C

Axial Tilt: 4.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (41)

Outer Limit: 64,193,135 km

• M1: 181,612 km (0.057 R)
• M2: 277,205 km (0.111 R)
• M3: 387,907 km (0.113 R)
• M4: 500,554 km (0.088 R)
• M5: 913,445 km (0.061 R)
• M6: 1,083,089 km (0.087 R)
• M7: 1,224,758 km (0.06 R)
• M8: 1,326,933 km (0.113 R)
• M9: 1,426,117 km (0.117 R)
• M10: 1,540,260 km (0.047 R)
• M11: 1,663,977 km (0.055 R)
• M12: 1,921,884 km (0.078 R)
• M13: 2,083,150 km (0.116 R)
• M14: 2,263,117 km (0.076 R)
• M15: 2,390,724 km (0.061 R)
• M16: 2,609,136 km (0.046 R)
• M17: 2,788,804 km (0.111 R)
• M18: 2,926,284 km (0.086 R)
• M19: 3,168,483 km (0.063 R)
• M20: 3,328,253 km (0.106 R)
• M21: 3,474,411 km (0.085 R)
• M22: 3,614,584 km (0.1 R)
• M23: 3,714,665 km (0.089 R)
• M24: 4,003,239 km (0.071 R)
• M25: 4,185,300 km (0.077 R)
• M26: 4,352,400 km (0.116 R)
• M27: 4,494,818 km (0.088 R)
• M28: 4,702,459 km (0.108 R)
• M29: 4,848,766 km (0.081 R)
• M30: 5,080,344 km (0.104 R)
• M31: 5,249,539 km (0.11 R)
• M32: 5,535,570 km (0.102 R)
• M33: 5,690,254 km (0.056 R)
• M34: 5,817,113 km (0.038 R)
• M35: 5,934,847 km (0.073 R)
• M36: 6,073,374 km (0.116 R)
• M37: 6,223,122 km (0.086 R)
• M38: 6,373,916 km (0.112 R)
• M39: 6,546,403 km (0.111 R)
• M40: 6,813,285 km (0.037 R)
• M41: 7,083,758 km (0.027 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.93 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 83.8

Radius: 12

Gravity: 0.58 G

Time & Orbit

Eccentricity (e): 0.226

Orbit Range: 1.49 AU - 2.37 AU

Year: 1731 Days

Day: 6.1 Hours

Environment

Temp: -197 °C

Axial Tilt: 25.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (50)

Outer Limit: 64,193,135 km

• M1: 149,448 km (0.099 R)
• M2: 242,648 km (0.109 R)
• M3: 328,667 km (0.101 R)
• M4: 442,810 km (0.12 R)
• M5: 557,402 km (0.109 R)
• M6: 661,372 km (0.051 R)
• M7: 763,248 km (0.119 R)
• M8: 901,626 km (0.057 R)
• M9: 1,054,515 km (0.083 R)
• M10: 1,165,218 km (0.059 R)
• M11: 1,339,200 km (0.093 R)
• M12: 1,466,358 km (0.116 R)
• M13: 1,668,166 km (0.103 R)
• M14: 1,879,248 km (0.072 R)
• M15: 1,953,898 km (0.094 R)
• M16: 2,127,431 km (0.115 R)
• M17: 2,371,874 km (0.077 R)
• M18: 2,497,686 km (0.027 R)
• M19: 2,633,222 km (0.034 R)
• M20: 2,849,241 km (0.077 R)
• M21: 2,927,780 km (0.09 R)
• M22: 3,111,187 km (0.12 R)
• M23: 3,192,269 km (0.06 R)
• M24: 3,323,317 km (0.117 R)
• M25: 3,397,966 km (0.103 R)
• M26: 3,489,819 km (0.119 R)
• M27: 3,684,745 km (0.077 R)
• M28: 3,891,938 km (0.08 R)
• M29: 4,174,379 km (0.098 R)
• M30: 4,309,017 km (0.031 R)
• M31: 4,472,677 km (0.098 R)
• M32: 4,564,530 km (0.076 R)
• M33: 4,656,832 km (0.07 R)
• M34: 4,740,607 km (0.118 R)
• M35: 4,890,803 km (0.095 R)
• M36: 4,975,924 km (0.116 R)
• M37: 5,176,535 km (0.089 R)
• M38: 5,331,219 km (0.043 R)
• M39: 5,477,676 km (0.096 R)
• M40: 5,615,455 km (0.104 R)
• M41: 5,734,685 km (0.081 R)
• M42: 5,864,685 km (0.091 R)
• M43: 5,945,169 km (0.038 R)
• M44: 6,148,024 km (0.079 R)
• M45: 6,291,338 km (0.073 R)
• M46: 6,477,438 km (0.116 R)
• M47: 6,707,221 km (0.07 R)
• M48: 6,812,687 km (0.065 R)
• M49: 7,046,509 km (0.042 R)
• M50: 7,380,411 km (0.061 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 459.7

Radius: 10

Gravity: 4.6 G

Time & Orbit

Eccentricity (e): 0.228

Orbit Range: 3.57 AU - 5.69 AU

Year: 6433 Days

Day: 6.2 Hours

Environment

Temp: -216 °C

Axial Tilt: 35.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 64,193,135 km

• M1: 199,564 km (0.096 R)
• M2: 294,409 km (0.106 R)
• M3: 451,935 km (0.078 R)
• M4: 548,276 km (0.074 R)
• M5: 965,355 km (0.119 R)
• M6: 1,036,414 km (0.116 R)
• M7: 1,307,485 km (0.087 R)
• M8: 1,419,085 km (0.081 R)
• M9: 1,618,200 km (0.094 R)
• M10: 1,790,986 km (0.061 R)
• M11: 1,879,847 km (0.116 R)
• M12: 2,006,706 km (0.025 R)
• M13: 2,230,953 km (0.109 R)
• M14: 2,424,233 km (0.091 R)
• M15: 2,663,291 km (0.098 R)
• M16: 3,718,105 km (0.066 R)
• M17: 3,878,474 km (0.101 R)
• M18: 4,714,577 km (0.046 R)
• M19: 4,988,640 km (0.096 R)
• M20: 5,396,743 km (0.105 R)
• M21: 5,604,834 km (0.096 R)
• M22: 5,709,852 km (0.118 R)
• M23: 6,002,166 km (0.097 R)
• M24: 6,082,799 km (0.061 R)
• M25: 6,381,247 km (0.053 R)
• M26: 6,684,781 km (0.05 R)
• M27: 6,908,280 km (0.065 R)
• M28: 6,992,803 km (0.104 R)
• M29: 7,191,319 km (0.109 R)
• M30: 7,277,039 km (0.104 R)
• M31: 7,536,142 km (0.044 R)
• M32: 7,768,917 km (0.08 R)
• M33: 7,856,880 km (0.105 R)
• M34: 8,271,565 km (0.103 R)
• M35: 8,511,670 km (0.115 R)
• M36: 9,277,162 km (0.085 R)
• M37: 10,321,056 km (0.092 R)
• M38: 10,417,846 km (0.107 R)
• M39: 11,535,492 km (0.043 R)
• M40: 11,972,766 km (0.091 R)
• M41: 12,074,493 km (0.065 R)
• M42: 12,312,952 km (0.075 R)
• M43: 12,829,065 km (0.102 R)
• M44: 13,247,191 km (0.11 R)
• M45: 13,669,655 km (0.097 R)
• M46: 13,882,682 km (0.085 R)
• M47: 14,419,739 km (0.092 R)
• M48: 14,491,995 km (0.066 R)
• M49: 14,564,250 km (0.111 R)
• M50: 14,709,061 km (0.042 R)
• M51: 15,036,830 km (0.114 R)
• M52: 16,146,697 km (0.109 R)
• M53: 16,371,841 km (0.07 R)
• M54: 16,522,486 km (0.057 R)
• M55: 16,635,732 km (0.114 R)
• M56: 17,282,743 km (0.098 R)
• M57: 17,976,727 km (0.12 R)
• M58: 18,995,190 km (0.083 R)
• M59: 19,113,970 km (0.054 R)
• M60: 19,391,923 km (0.068 R)
• M61: 19,671,222 km (0.1 R)
• M62: 19,992,110 km (0.07 R)
• M63: 20,112,985 km (0.105 R)
• M64: 20,476,657 km (0.093 R)
• M65: 21,251,874 km (0.056 R)
• M66: 21,334,003 km (0.101 R)
• M67: 22,036,664 km (0.114 R)
• M68: 23,252,595 km (0.108 R)
• M69: 23,719,490 km (0.102 R)
• M70: 23,847,397 km (0.118 R)
• M71: 24,318,331 km (0.043 R)
• M72: 24,404,349 km (0.029 R)
• M73: 24,878,724 km (0.078 R)
• M74: 26,320,549 km (0.111 R)
• M75: 27,879,209 km (0.036 R)
• M76: 28,601,617 km (0.079 R)
• M77: 28,692,423 km (0.119 R)
• M78: 29,513,416 km (0.057 R)

Planet 5 - Gas Giant

Semi-Major Axis: 5.43 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 489.1

Radius: 13.9

Gravity: 2.53 G

Time & Orbit

Eccentricity (e): 0.143

Orbit Range: 4.65 AU - 6.21 AU

Year: 8170 Days

Day: 11 Hours

Environment

Temp: -208 °C

Axial Tilt: 8.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 64,193,135 km

• M1: 286,330 km (0.049 R)
• M2: 438,172 km (0.052 R)
• M3: 589,565 km (0.036 R)
• M4: 1,064,090 km (0.041 R)
• M5: 1,477,279 km (0.043 R)
• M6: 1,702,723 km (0.098 R)
• M7: 1,839,755 km (0.04 R)
• M8: 2,251,897 km (0.08 R)
• M9: 2,447,122 km (0.073 R)
• M10: 2,901,152 km (0.093 R)
• M11: 3,259,438 km (0.061 R)
• M12: 3,810,707 km (0.096 R)
• M13: 4,256,957 km (0.08 R)
• M14: 4,391,445 km (0.079 R)
• M15: 4,554,657 km (0.092 R)
• M16: 5,142,128 km (0.116 R)
• M17: 5,459,574 km (0.047 R)
• M18: 5,843,143 km (0.108 R)
• M19: 6,053,328 km (0.073 R)
• M20: 6,357,910 km (0.068 R)
• M21: 6,667,727 km (0.109 R)
• M22: 6,887,486 km (0.118 R)
• M23: 7,496,200 km (0.111 R)
• M24: 7,626,649 km (0.057 R)
• M25: 7,889,642 km (0.096 R)
• M26: 8,323,626 km (0.106 R)
• M27: 8,594,547 km (0.087 R)
• M28: 8,799,646 km (0.099 R)
• M29: 9,495,126 km (0.113 R)
• M30: 9,742,711 km (0.102 R)
• M31: 10,172,356 km (0.085 R)
• M32: 10,462,127 km (0.094 R)
• M33: 12,411,836 km (0.09 R)
• M34: 12,644,012 km (0.073 R)
• M35: 12,955,774 km (0.095 R)
• M36: 13,112,702 km (0.114 R)
• M37: 13,666,513 km (0.1 R)
• M38: 13,866,227 km (0.12 R)
• M39: 14,066,987 km (0.056 R)
• M40: 14,228,253 km (0.102 R)
• M41: 14,511,891 km (0.105 R)
• M42: 15,167,279 km (0.115 R)
• M43: 15,623,553 km (0.03 R)
• M44: 16,337,583 km (0.069 R)
• M45: 17,450,143 km (0.086 R)
• M46: 17,580,143 km (0.058 R)
• M47: 17,928,258 km (0.067 R)
• M48: 18,146,970 km (0.12 R)
• M49: 18,897,353 km (0.063 R)
• M50: 19,164,684 km (0.066 R)
• M51: 19,568,000 km (0.101 R)
• M52: 21,533,267 km (0.089 R)
• M53: 21,812,566 km (0.111 R)
• M54: 22,186,711 km (0.103 R)
• M55: 22,610,222 km (0.085 R)
• M56: 22,799,164 km (0.088 R)
• M57: 24,137,467 km (0.081 R)
• M58: 25,108,955 km (0.099 R)
• M59: 25,796,657 km (0.072 R)
• M60: 25,994,126 km (0.079 R)
• M61: 27,391,520 km (0.113 R)
• M62: 27,492,349 km (0.044 R)
• M63: 27,744,720 km (0.056 R)
• M64: 27,947,276 km (0.056 R)
• M65: 28,150,131 km (0.086 R)
• M66: 28,353,584 km (0.105 R)
• M67: 28,506,622 km (0.104 R)
• M68: 29,895,190 km (0.063 R)
• M69: 30,467,402 km (0.108 R)
• M70: 30,728,599 km (0.112 R)
• M71: 31,675,105 km (0.102 R)
• M72: 32,045,958 km (0.034 R)
• M73: 32,311,494 km (0.113 R)
• M74: 33,274,157 km (0.036 R)
• M75: 33,435,423 km (0.095 R)
• M76: 34,572,068 km (0.059 R)
• M77: 35,501,519 km (0.094 R)
• M78: 36,439,199 km (0.068 R)

Planet 6 - Ice Giant

Semi-Major Axis: 8.12 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 266.8

Radius: 4.4

Gravity: 13.78 G

Time & Orbit

Eccentricity (e): 0.239

Orbit Range: 6.18 AU - 10.06 AU

Year: 14940 Days

Day: 18.5 Hours

Environment

Temp: -217 °C

Axial Tilt: 31.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (82)

Outer Limit: 64,193,135 km

• M1: 70,909 km (0.106 R)
• M2: 882,927 km (0.097 R)
• M3: 1,050,027 km (0.078 R)
• M4: 2,296,028 km (0.072 R)
• M5: 3,314,191 km (0.039 R)
• M6: 4,233,919 km (0.06 R)
• M7: 4,673,587 km (0.04 R)
• M8: 4,898,881 km (0.077 R)
• M9: 5,061,943 km (0.037 R)
• M10: 5,193,739 km (0.107 R)
• M11: 5,326,582 km (0.118 R)
• M12: 5,834,915 km (0.041 R)
• M13: 6,147,425 km (0.096 R)
• M14: 6,182,431 km (0.091 R)
• M15: 6,287,898 km (0.09 R)
• M16: 6,644,090 km (0.084 R)
• M17: 7,487,822 km (0.118 R)
• M18: 7,600,320 km (0.112 R)
• M19: 7,638,018 km (0.102 R)
• M20: 7,789,112 km (0.081 R)
• M21: 7,979,401 km (0.036 R)
• M22: 9,033,617 km (0.113 R)
• M23: 9,073,410 km (0.09 R)
• M24: 9,883,183 km (0.055 R)
• M25: 9,965,462 km (0.12 R)
• M26: 10,006,602 km (0.081 R)
• M27: 10,970,012 km (0.084 R)
• M28: 13,118,836 km (0.064 R)
• M29: 13,345,177 km (0.106 R)
• M30: 13,755,973 km (0.112 R)
• M31: 14,310,233 km (0.062 R)
• M32: 14,730,603 km (0.088 R)
• M33: 14,871,674 km (0.107 R)
• M34: 15,202,435 km (0.077 R)
• M35: 15,345,002 km (0.086 R)
• M36: 15,440,295 km (0.039 R)
• M37: 16,064,268 km (0.104 R)
• M38: 16,209,528 km (0.118 R)
• M39: 16,598,781 km (0.08 R)
• M40: 16,745,537 km (0.079 R)
• M41: 17,089,612 km (0.116 R)
• M42: 17,386,414 km (0.076 R)
• M43: 17,834,909 km (0.115 R)
• M44: 17,884,874 km (0.04 R)
• M45: 17,985,254 km (0.109 R)
• M46: 19,821,568 km (0.119 R)
• M47: 19,925,389 km (0.114 R)
• M48: 20,081,420 km (0.088 R)
• M49: 20,499,396 km (0.105 R)
• M50: 20,920,065 km (0.118 R)
• M51: 21,610,011 km (0.085 R)
• M52: 21,716,824 km (0.057 R)
• M53: 22,253,431 km (0.093 R)
• M54: 24,554,396 km (0.098 R)
• M55: 25,057,195 km (0.088 R)
• M56: 26,073,114 km (0.105 R)
• M57: 26,357,649 km (0.097 R)
• M58: 26,872,415 km (0.092 R)
• M59: 27,564,006 km (0.099 R)
• M60: 27,737,839 km (0.086 R)
• M61: 28,144,745 km (0.074 R)
• M62: 29,614,245 km (0.103 R)
• M63: 30,149,356 km (0.116 R)
• M64: 30,328,425 km (0.077 R)
• M65: 30,627,621 km (0.111 R)
• M66: 31,289,442 km (0.06 R)
• M67: 31,410,317 km (0.087 R)
• M68: 33,179,611 km (0.076 R)
• M69: 33,426,298 km (0.062 R)
• M70: 34,356,348 km (0.064 R)
• M71: 34,730,791 km (0.033 R)
• M72: 36,559,476 km (0.101 R)
• M73: 37,069,455 km (0.111 R)
• M74: 37,838,837 km (0.034 R)
• M75: 38,743,006 km (0.085 R)
• M76: 39,981,527 km (0.077 R)
• M77: 40,178,248 km (0.072 R)
• M78: 41,100,519 km (0.073 R)
• M79: 42,898,985 km (0.094 R)
• M80: 43,033,323 km (0.092 R)
• M81: 43,909,219 km (0.03 R)
• M82: 44,654,964 km (0.114 R)

Planet 7 - Ice Giant

Semi-Major Axis: 8.46 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 651.8

Radius: 5.5

Gravity: 21.55 G

Time & Orbit

Eccentricity (e): 0.078

Orbit Range: 7.8 AU - 9.12 AU

Year: 15888 Days

Day: 18.6 Hours

Environment

Temp: -223 °C

Axial Tilt: 29 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 64,193,135 km

• M1: 186,249 km (0.086 R)
• M2: 368,908 km (0.102 R)
• M3: 742,753 km (0.082 R)
• M4: 1,034,469 km (0.088 R)
• M5: 1,916,498 km (0.115 R)
• M6: 2,065,797 km (0.052 R)
• M7: 2,157,351 km (0.091 R)
• M8: 2,344,348 km (0.098 R)
• M9: 2,700,690 km (0.082 R)
• M10: 2,868,390 km (0.107 R)
• M11: 3,981,547 km (0.1 R)
• M12: 4,019,396 km (0.074 R)
• M13: 4,523,540 km (0.089 R)
• M14: 4,682,563 km (0.114 R)
• M15: 5,547,687 km (0.045 R)
• M16: 6,063,950 km (0.11 R)
• M17: 6,550,442 km (0.098 R)
• M18: 7,940,206 km (0.071 R)
• M19: 8,965,101 km (0.055 R)
• M20: 9,671,203 km (0.058 R)
• M21: 11,082,809 km (0.095 R)
• M22: 11,136,365 km (0.05 R)
• M23: 11,405,192 km (0.102 R)
• M24: 12,837,442 km (0.097 R)
• M25: 13,006,338 km (0.046 R)
• M26: 13,631,807 km (0.11 R)
• M27: 13,804,144 km (0.073 R)
• M28: 14,092,867 km (0.098 R)
• M29: 14,971,007 km (0.071 R)
• M30: 15,148,879 km (0.117 R)
• M31: 15,806,511 km (0.057 R)
• M32: 17,026,332 km (0.108 R)
• M33: 17,772,526 km (0.078 R)
• M34: 19,361,256 km (0.11 R)
• M35: 19,490,209 km (0.086 R)
• M36: 20,009,314 km (0.086 R)
• M37: 20,139,763 km (0.11 R)
• M38: 20,532,906 km (0.085 R)
• M39: 21,193,680 km (0.102 R)
• M40: 22,807,991 km (0.07 R)
• M41: 22,944,274 km (0.114 R)
• M42: 23,286,255 km (0.09 R)
• M43: 23,492,251 km (0.074 R)
• M44: 24,044,417 km (0.082 R)
• M45: 25,161,614 km (0.1 R)
• M46: 25,443,606 km (0.097 R)
• M47: 26,367,074 km (0.103 R)
• M48: 26,797,018 km (0.078 R)
• M49: 27,084,994 km (0.102 R)
• M50: 27,736,492 km (0.048 R)
• M51: 28,173,767 km (0.102 R)
• M52: 28,466,530 km (0.052 R)
• M53: 29,350,803 km (0.118 R)
• M54: 29,721,955 km (0.06 R)
• M55: 30,169,403 km (0.034 R)
• M56: 31,070,879 km (0.116 R)
• M57: 31,676,751 km (0.067 R)
• M58: 33,208,483 km (0.069 R)
• M59: 33,750,327 km (0.111 R)
• M60: 34,999,619 km (0.053 R)
• M61: 35,630,024 km (0.059 R)
• M62: 36,662,249 km (0.093 R)
• M63: 36,742,135 km (0.104 R)
• M64: 36,981,790 km (0.052 R)
• M65: 37,463,047 km (0.059 R)
• M66: 38,188,596 km (0.076 R)
• M67: 40,805,662 km (0.115 R)
• M68: 42,052,261 km (0.067 R)
• M69: 42,135,886 km (0.049 R)
• M70: 43,903,086 km (0.075 R)
• M71: 44,923,792 km (0.069 R)
• M72: 45,780,389 km (0.107 R)
• M73: 47,075,308 km (0.098 R)
• M74: 47,248,842 km (0.03 R)
• M75: 47,335,758 km (0.093 R)
• M76: 47,509,591 km (0.049 R)
• M77: 48,294,681 km (0.101 R)
• M78: 48,382,195 km (0.083 R)
• M79: 49,084,109 km (0.072 R)
• M80: 51,209,894 km (0.11 R)
• M81: 51,299,055 km (0.1 R)
• M82: 52,463,674 km (0.103 R)
• M83: 52,913,964 km (0.107 R)
• M84: 53,275,093 km (0.051 R)
• M85: 53,546,463 km (0.084 R)
• M86: 55,367,518 km (0.064 R)
• M87: 56,009,592 km (0.065 R)
• M88: 56,101,595 km (0.12 R)
• M89: 56,746,511 km (0.062 R)
• M90: 58,043,675 km (0.073 R)
• M91: 58,322,974 km (0.06 R)
• M92: 60,667,322 km (0.075 R)
• M93: 61,518,833 km (0.103 R)
• M94: 63,233,674 km (0.105 R)
• M95: 64,000,811 km (0.037 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: 487 - 12,209 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit