🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.59 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.7

Radius: 0.87

Gravity: 0.92 G

Time & Orbit

Eccentricity (e): 0.087

Orbit Range: 0.54 AU - 0.64 AU

Year: 165 Days

Day: 45.4 Hours

Environment

Temp: 237 °C

Axial Tilt: 75.4 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 0.59 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.71

Radius: 1.24

Gravity: 1.11 G

Time & Orbit

Eccentricity (e): 0.207

Orbit Range: 0.47 AU - 0.71 AU

Year: 165 Days

Day: 19.5 Hours

Environment

Temp: 164 °C

Axial Tilt: 19.5 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Terrestrial

Semi-Major Axis: 0.76 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.25

Radius: 1.09

Gravity: 1.05 G

Time & Orbit

Eccentricity (e): 0.05

Orbit Range: 0.72 AU - 0.8 AU

Year: 241 Days

Day: 17.7 Hours

Environment

Temp: 145 °C

Axial Tilt: 23.1 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 4 - Terrestrial

Semi-Major Axis: 1.52 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.84

Radius: 1.71

Gravity: 1.31 G

Time & Orbit

Eccentricity (e): 0.151

Orbit Range: 1.29 AU - 1.75 AU

Year: 681 Days

Day: 47.8 Hours

Environment

Temp: -41 °C

Axial Tilt: 32.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Terrestrial

Semi-Major Axis: 3.88 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.01

Radius: 1

Gravity: 1.01 G

Time & Orbit

Eccentricity (e): 0.024

Orbit Range: 3.79 AU - 3.97 AU

Year: 2778 Days

Day: 16 Hours

Environment

Temp: -118 °C

Axial Tilt: 38.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 68,187,251 km

• M1: 354,846 km (0.107 R)

Planet 6 - Gas Giant

Semi-Major Axis: 6.07 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 172.5

Radius: 9.6

Gravity: 1.87 G

Time & Orbit

Eccentricity (e): 0.095

Orbit Range: 5.49 AU - 6.65 AU

Year: 5435 Days

Day: 9 Hours

Environment

Temp: -157 °C

Axial Tilt: 131 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (46)

Outer Limit: 68,187,251 km

• M1: 176,077 km (0.058 R)
• M2: 285,732 km (0.107 R)
• M3: 436,227 km (0.097 R)
• M4: 1,426,117 km (0.08 R)
• M5: 2,117,259 km (0.112 R)
• M6: 2,490,356 km (0.094 R)
• M7: 2,639,355 km (0.089 R)
• M8: 2,899,656 km (0.095 R)
• M9: 3,578,231 km (0.074 R)
• M10: 4,322,331 km (0.063 R)
• M11: 4,484,196 km (0.109 R)
• M12: 4,813,611 km (0.112 R)
• M13: 5,208,100 km (0.113 R)
• M14: 5,322,842 km (0.048 R)
• M15: 5,652,107 km (0.056 R)
• M16: 5,789,737 km (0.089 R)
• M17: 5,968,357 km (0.093 R)
• M18: 6,088,334 km (0.044 R)
• M19: 6,494,343 km (0.113 R)
• M20: 6,555,977 km (0.101 R)
• M21: 7,119,662 km (0.044 R)
• M22: 7,504,278 km (0.062 R)
• M23: 7,633,830 km (0.034 R)
• M24: 7,851,644 km (0.089 R)
• M25: 8,093,694 km (0.083 R)
• M26: 8,204,396 km (0.061 R)
• M27: 8,405,156 km (0.104 R)
• M28: 8,879,830 km (0.049 R)
• M29: 9,132,052 km (0.117 R)
• M30: 10,259,871 km (0.113 R)
• M31: 10,476,189 km (0.105 R)
• M32: 10,962,382 km (0.107 R)
• M33: 11,307,056 km (0.047 R)
• M34: 12,515,956 km (0.108 R)
• M35: 13,135,740 km (0.077 R)
• M36: 14,190,704 km (0.108 R)
• M37: 16,577,987 km (0.078 R)
• M38: 16,719,058 km (0.112 R)
• M39: 17,315,355 km (0.086 R)
• M40: 18,005,450 km (0.112 R)
• M41: 18,383,035 km (0.111 R)
• M42: 19,234,696 km (0.086 R)
• M43: 19,382,798 km (0.051 R)
• M44: 19,501,578 km (0.107 R)
• M45: 19,739,888 km (0.111 R)
• M46: 20,009,164 km (0.027 R)

Planet 7 - Gas Giant

Semi-Major Axis: 10.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 398.1

Radius: 12.3

Gravity: 2.63 G

Time & Orbit

Eccentricity (e): 0.177

Orbit Range: 8.7 AU - 12.44 AU

Year: 12489 Days

Day: 13 Hours

Environment

Temp: -187 °C

Axial Tilt: 44.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 68,187,251 km

• M1: 154,385 km (0.071 R)
• M2: 264,639 km (0.116 R)
• M3: 358,137 km (0.03 R)
• M4: 972,835 km (0.086 R)
• M5: 1,140,833 km (0.051 R)
• M6: 1,726,210 km (0.096 R)
• M7: 2,812,290 km (0.035 R)
• M8: 3,112,234 km (0.084 R)
• M9: 3,862,019 km (0.103 R)
• M10: 4,042,882 km (0.116 R)
• M11: 4,195,921 km (0.08 R)
• M12: 4,350,755 km (0.11 R)
• M13: 4,476,118 km (0.075 R)
• M14: 4,794,612 km (0.065 R)
• M15: 5,219,919 km (0.108 R)
• M16: 5,454,039 km (0.103 R)
• M17: 5,589,425 km (0.032 R)
• M18: 5,760,116 km (0.093 R)
• M19: 6,247,506 km (0.112 R)
• M20: 6,424,929 km (0.034 R)
• M21: 6,966,922 km (0.102 R)
• M22: 7,077,176 km (0.069 R)
• M23: 7,448,628 km (0.059 R)
• M24: 7,979,550 km (0.097 R)
• M25: 8,522,890 km (0.066 R)
• M26: 8,759,404 km (0.102 R)
• M27: 8,918,277 km (0.049 R)
• M28: 9,563,343 km (0.102 R)
• M29: 10,015,727 km (0.063 R)
• M30: 10,265,406 km (0.074 R)
• M31: 12,247,278 km (0.114 R)
• M32: 12,380,570 km (0.06 R)
• M33: 13,236,120 km (0.118 R)
• M34: 13,556,110 km (0.077 R)
• M35: 13,925,019 km (0.111 R)
• M36: 14,017,620 km (0.12 R)
• M37: 14,297,218 km (0.096 R)
• M38: 14,625,585 km (0.116 R)
• M39: 15,385,543 km (0.052 R)
• M40: 15,770,308 km (0.116 R)
• M41: 16,012,358 km (0.111 R)
• M42: 16,353,441 km (0.083 R)
• M43: 18,246,602 km (0.118 R)
• M44: 19,737,494 km (0.088 R)
• M45: 19,893,974 km (0.096 R)
• M46: 20,208,129 km (0.112 R)
• M47: 21,965,306 km (0.075 R)
• M48: 22,999,177 km (0.107 R)
• M49: 23,439,294 km (0.099 R)
• M50: 24,383,555 km (0.112 R)
• M51: 24,888,598 km (0.092 R)
• M52: 25,567,323 km (0.047 R)
• M53: 26,080,294 km (0.053 R)
• M54: 26,366,774 km (0.116 R)
• M55: 26,596,706 km (0.099 R)
• M56: 27,639,703 km (0.119 R)
• M57: 27,756,389 km (0.099 R)
• M58: 28,577,980 km (0.045 R)
• M59: 28,755,104 km (0.112 R)
• M60: 29,288,720 km (0.115 R)
• M61: 29,467,190 km (0.111 R)
• M62: 29,646,109 km (0.039 R)
• M63: 30,848,278 km (0.072 R)
• M64: 31,151,213 km (0.11 R)
• M65: 31,638,154 km (0.05 R)
• M66: 31,943,633 km (0.086 R)
• M67: 32,066,154 km (0.025 R)
• M68: 33,424,054 km (0.054 R)
• M69: 33,610,752 km (0.062 R)
• M70: 35,305,845 km (0.103 R)
• M71: 36,451,466 km (0.115 R)
• M72: 37,415,325 km (0.1 R)
• M73: 38,127,561 km (0.119 R)
• M74: 38,844,284 km (0.091 R)
• M75: 39,762,964 km (0.12 R)
• M76: 41,020,933 km (0.063 R)
• M77: 41,688,439 km (0.068 R)
• M78: 43,101,690 km (0.093 R)
• M79: 43,712,049 km (0.102 R)
• M80: 44,120,750 km (0.043 R)
• M81: 44,257,184 km (0.117 R)
• M82: 44,667,381 km (0.109 R)
• M83: 45,698,709 km (0.114 R)

Planet 8 - Ice Giant

Semi-Major Axis: 14.52 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 392.3

Radius: 4.4

Gravity: 20.26 G

Time & Orbit

Eccentricity (e): 0.14

Orbit Range: 12.49 AU - 16.55 AU

Year: 20108 Days

Day: 20.6 Hours

Environment

Temp: -193 °C

Axial Tilt: 5.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 68,187,251 km

• M1: 118,033 km (0.118 R)
• M2: 182,958 km (0.1 R)
• M3: 275,709 km (0.107 R)
• M4: 320,289 km (0.087 R)
• M5: 580,739 km (0.067 R)
• M6: 986,000 km (0.12 R)
• M7: 1,178,233 km (0.118 R)
• M8: 1,304,344 km (0.103 R)
• M9: 1,794,127 km (0.088 R)
• M10: 1,880,744 km (0.096 R)
• M11: 1,968,858 km (0.054 R)
• M12: 2,088,536 km (0.094 R)
• M13: 2,334,924 km (0.08 R)
• M14: 2,429,619 km (0.048 R)
• M15: 2,493,497 km (0.108 R)
• M16: 3,302,822 km (0.112 R)
• M17: 3,735,608 km (0.043 R)
• M18: 3,958,659 km (0.037 R)
• M19: 3,996,358 km (0.026 R)
• M20: 4,034,056 km (0.119 R)
• M21: 4,339,984 km (0.11 R)
• M22: 4,417,775 km (0.091 R)
• M23: 4,495,865 km (0.035 R)
• M24: 5,096,500 km (0.108 R)
• M25: 5,137,340 km (0.102 R)
• M26: 5,302,197 km (0.102 R)
• M27: 5,510,737 km (0.116 R)
• M28: 5,807,090 km (0.09 R)
• M29: 6,195,745 km (0.113 R)
• M30: 6,283,260 km (0.095 R)
• M31: 6,371,224 km (0.035 R)
• M32: 6,415,355 km (0.071 R)
• M33: 6,637,508 km (0.097 R)
• M34: 7,318,926 km (0.073 R)
• M35: 7,927,341 km (0.114 R)
• M36: 8,503,293 km (0.11 R)
• M37: 9,042,892 km (0.114 R)
• M38: 9,291,973 km (0.092 R)
• M39: 9,392,203 km (0.108 R)
• M40: 10,000,917 km (0.044 R)
• M41: 10,310,136 km (0.119 R)
• M42: 10,413,957 km (0.089 R)
• M43: 11,685,987 km (0.111 R)
• M44: 11,848,301 km (0.088 R)
• M45: 12,120,719 km (0.078 R)
• M46: 12,450,283 km (0.064 R)
• M47: 12,782,839 km (0.044 R)
• M48: 12,894,289 km (0.118 R)
• M49: 13,062,138 km (0.1 R)
• M50: 13,286,984 km (0.112 R)
• M51: 14,372,765 km (0.107 R)
• M52: 16,083,865 km (0.079 R)
• M53: 16,567,216 km (0.116 R)
• M54: 17,300,994 km (0.108 R)
• M55: 17,671,847 km (0.088 R)
• M56: 18,421,482 km (0.073 R)
• M57: 20,340,374 km (0.054 R)
• M58: 20,994,116 km (0.037 R)
• M59: 21,389,504 km (0.109 R)
• M60: 21,854,005 km (0.111 R)
• M61: 22,254,778 km (0.083 R)
• M62: 23,335,473 km (0.102 R)
• M63: 24,019,434 km (0.083 R)
• M64: 24,433,072 km (0.039 R)
• M65: 25,828,521 km (0.078 R)
• M66: 27,465,122 km (0.071 R)
• M67: 27,680,992 km (0.096 R)
• M68: 28,623,159 km (0.07 R)
• M69: 31,964,727 km (0.081 R)
• M70: 34,880,838 km (0.086 R)
• M71: 35,897,804 km (0.115 R)
• M72: 37,880,724 km (0.109 R)
• M73: 38,522,648 km (0.108 R)
• M74: 40,633,923 km (0.107 R)
• M75: 41,291,107 km (0.097 R)
• M76: 41,869,003 km (0.06 R)
• M77: 42,034,608 km (0.106 R)
• M78: 44,038,771 km (0.118 R)
• M79: 44,544,561 km (0.098 R)
• M80: 45,052,446 km (0.109 R)
• M81: 46,159,321 km (0.064 R)
• M82: 47,016,666 km (0.041 R)
• M83: 47,188,853 km (0.111 R)
• M84: 47,361,190 km (0.091 R)
• M85: 49,096,076 km (0.115 R)
• M86: 50,146,852 km (0.109 R)
• M87: 50,322,779 km (0.115 R)
• M88: 50,586,969 km (0.105 R)
• M89: 52,270,842 km (0.113 R)
• M90: 54,695,076 km (0.082 R)
• M91: 56,788,848 km (0.077 R)
• M92: 57,523,224 km (0.113 R)
• M93: 58,168,439 km (0.075 R)
• M94: 58,353,193 km (0.087 R)
• M95: 61,336,174 km (0.08 R)
• M96: 61,618,316 km (0.112 R)

Planet 9 - Ice Giant

Semi-Major Axis: 16.47 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 318.1

Radius: 3.3

Gravity: 29.21 G

Time & Orbit

Eccentricity (e): 0.022

Orbit Range: 16.11 AU - 16.83 AU

Year: 24292 Days

Day: 17.6 Hours

Environment

Temp: -185 °C

Axial Tilt: 38 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 68,187,251 km

• M1: 118,332 km (0.088 R)
• M2: 164,258 km (0.046 R)
• M3: 245,041 km (0.104 R)
• M4: 929,452 km (0.099 R)
• M5: 1,001,707 km (0.026 R)
• M6: 1,203,664 km (0.084 R)
• M7: 1,363,285 km (0.073 R)
• M8: 1,911,711 km (0.073 R)
• M9: 2,520,126 km (0.051 R)
• M10: 2,897,561 km (0.097 R)
• M11: 3,780,787 km (0.085 R)
• M12: 4,052,906 km (0.09 R)
• M13: 4,990,735 km (0.075 R)
• M14: 5,032,921 km (0.031 R)
• M15: 5,203,164 km (0.089 R)
• M16: 5,505,501 km (0.1 R)
• M17: 5,636,698 km (0.053 R)
• M18: 5,680,680 km (0.081 R)
• M19: 5,857,953 km (0.116 R)
• M20: 6,172,259 km (0.064 R)
• M21: 7,100,364 km (0.096 R)
• M22: 7,195,508 km (0.097 R)
• M23: 7,483,633 km (0.069 R)
• M24: 7,824,417 km (0.113 R)
• M25: 7,873,635 km (0.067 R)
• M26: 8,320,185 km (0.103 R)
• M27: 8,928,300 km (0.066 R)
• M28: 9,289,579 km (0.113 R)
• M29: 9,919,984 km (0.051 R)
• M30: 10,186,717 km (0.087 R)
• M31: 11,611,488 km (0.047 R)
• M32: 11,948,980 km (0.063 R)
• M33: 12,232,767 km (0.09 R)
• M34: 12,289,764 km (0.098 R)
• M35: 13,213,980 km (0.087 R)
• M36: 13,921,578 km (0.06 R)
• M37: 15,006,013 km (0.078 R)
• M38: 16,493,614 km (0.048 R)
• M39: 16,556,595 km (0.111 R)
• M40: 16,872,845 km (0.093 R)
• M41: 17,897,889 km (0.085 R)
• M42: 19,075,075 km (0.111 R)
• M43: 19,873,628 km (0.096 R)
• M44: 20,819,087 km (0.039 R)
• M45: 22,055,962 km (0.04 R)
• M46: 22,963,872 km (0.073 R)
• M47: 23,457,844 km (0.108 R)
• M48: 23,599,662 km (0.071 R)
• M49: 23,955,257 km (0.039 R)
• M50: 24,888,448 km (0.045 R)
• M51: 25,395,735 km (0.074 R)
• M52: 26,346,878 km (0.068 R)
• M53: 26,789,837 km (0.041 R)
• M54: 26,938,089 km (0.073 R)
• M55: 27,832,833 km (0.105 R)
• M56: 28,284,021 km (0.113 R)
• M57: 31,508,453 km (0.068 R)
• M58: 31,743,172 km (0.114 R)
• M59: 31,899,951 km (0.096 R)
• M60: 33,084,317 km (0.061 R)
• M61: 33,243,190 km (0.118 R)
• M62: 33,482,247 km (0.094 R)
• M63: 33,881,674 km (0.038 R)
• M64: 35,251,841 km (0.046 R)
• M65: 38,713,835 km (0.082 R)
• M66: 39,976,141 km (0.045 R)
• M67: 40,060,814 km (0.11 R)
• M68: 40,315,130 km (0.06 R)
• M69: 41,166,492 km (0.067 R)
• M70: 41,508,772 km (0.029 R)
• M71: 43,234,084 km (0.073 R)
• M72: 47,469,200 km (0.099 R)
• M73: 48,097,810 km (0.104 R)
• M74: 48,548,399 km (0.072 R)
• M75: 49,726,781 km (0.083 R)
• M76: 51,465,707 km (0.113 R)
• M77: 53,224,529 km (0.099 R)
• M78: 53,410,778 km (0.114 R)
• M79: 53,597,327 km (0.077 R)
• M80: 53,690,676 km (0.114 R)
• M81: 53,877,374 km (0.031 R)
• M82: 55,852,066 km (0.113 R)
• M83: 56,325,693 km (0.115 R)
• M84: 58,617,682 km (0.05 R)
• M85: 58,713,873 km (0.079 R)
• M86: 59,968,700 km (0.108 R)
• M87: 60,259,518 km (0.106 R)
• M88: 61,720,641 km (0.069 R)
• M89: 62,112,288 km (0.106 R)
• M90: 62,504,833 km (0.086 R)
• M91: 62,996,411 km (0.08 R)
• M92: 63,588,221 km (0.108 R)
• M93: 63,785,839 km (0.064 R)
• M94: 63,983,757 km (0.119 R)
• M95: 64,876,707 km (0.091 R)
• M96: 66,273,801 km (0.096 R)

Planet 10 - Ice Giant

Semi-Major Axis: 17.93 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 259

Radius: 5.5

Gravity: 8.56 G

Time & Orbit

Eccentricity (e): 0.016

Orbit Range: 17.64 AU - 18.22 AU

Year: 27593 Days

Day: 19.5 Hours

Environment

Temp: -190 °C

Axial Tilt: 1.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (68)

Outer Limit: 68,187,251 km

• M1: 387,608 km (0.101 R)
• M2: 476,768 km (0.081 R)
• M3: 654,790 km (0.086 R)
• M4: 829,969 km (0.113 R)
• M5: 947,104 km (0.053 R)
• M6: 1,069,475 km (0.087 R)
• M7: 1,120,039 km (0.111 R)
• M8: 1,439,580 km (0.117 R)
• M9: 1,495,680 km (0.114 R)
• M10: 1,667,867 km (0.083 R)
• M11: 1,938,340 km (0.082 R)
• M12: 2,254,889 km (0.115 R)
• M13: 2,621,703 km (0.119 R)
• M14: 2,690,368 km (0.086 R)
• M15: 2,864,799 km (0.074 R)
• M16: 3,078,874 km (0.104 R)
• M17: 3,522,581 km (0.026 R)
• M18: 4,145,058 km (0.09 R)
• M19: 4,927,604 km (0.079 R)
• M20: 5,227,249 km (0.11 R)
• M21: 6,483,721 km (0.1 R)
• M22: 7,582,218 km (0.051 R)
• M23: 7,631,287 km (0.108 R)
• M24: 8,228,182 km (0.109 R)
• M25: 8,278,597 km (0.098 R)
• M26: 8,430,438 km (0.106 R)
• M27: 8,532,165 km (0.102 R)
• M28: 8,840,037 km (0.109 R)
• M29: 9,413,596 km (0.111 R)
• M30: 10,215,141 km (0.09 R)
• M31: 11,149,679 km (0.109 R)
• M32: 12,168,740 km (0.032 R)
• M33: 12,515,059 km (0.026 R)
• M34: 12,806,027 km (0.09 R)
• M35: 12,923,012 km (0.119 R)
• M36: 15,337,222 km (0.07 R)
• M37: 15,899,262 km (0.076 R)
• M38: 16,404,454 km (0.082 R)
• M39: 16,722,948 km (0.1 R)
• M40: 16,915,031 km (0.088 R)
• M41: 20,631,342 km (0.064 R)
• M42: 20,700,007 km (0.083 R)
• M43: 20,837,338 km (0.118 R)
• M44: 21,459,366 km (0.114 R)
• M45: 22,792,432 km (0.111 R)
• M46: 23,218,936 km (0.082 R)
• M47: 24,296,639 km (0.044 R)
• M48: 29,151,539 km (0.104 R)
• M49: 29,691,886 km (0.063 R)
• M50: 30,547,436 km (0.082 R)
• M51: 31,253,538 km (0.119 R)
• M52: 32,203,186 km (0.097 R)
• M53: 33,162,407 km (0.095 R)
• M54: 38,687,655 km (0.114 R)
• M55: 39,536,324 km (0.073 R)
• M56: 40,219,836 km (0.082 R)
• M57: 42,729,640 km (0.079 R)
• M58: 47,899,293 km (0.101 R)
• M59: 48,262,966 km (0.093 R)
• M60: 49,543,224 km (0.043 R)
• M61: 50,279,844 km (0.042 R)
• M62: 51,763,855 km (0.072 R)
• M63: 54,395,282 km (0.097 R)
• M64: 59,298,801 km (0.095 R)
• M65: 63,242,350 km (0.109 R)
• M66: 64,742,817 km (0.12 R)
• M67: 65,144,936 km (0.053 R)
• M68: 65,648,782 km (0.068 R)

Kuiper Belt

Range: 30.2 - 59.2 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 520 - 19,131 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit