🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.62 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.68

Radius: 0.86

Gravity: 0.92 G

Time & Orbit

Eccentricity (e): 0.085

Orbit Range: 0.57 AU - 0.67 AU

Year: 187 Days

Day: 14.7 Hours

Environment

Temp: 135 °C

Axial Tilt: 46.4 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (1)

Outer Limit: 71,729,407 km

• M1: 20,345 km (0.092 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.64 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.47

Radius: 1.82

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.152

Orbit Range: 0.54 AU - 0.74 AU

Year: 196 Days

Day: 35.8 Hours

Environment

Temp: 182 °C

Axial Tilt: 16.1 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 3 - Gas Giant

Semi-Major Axis: 4.29 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 723.9

Radius: 8.3

Gravity: 10.51 G

Time & Orbit

Eccentricity (e): 0.189

Orbit Range: 3.48 AU - 5.1 AU

Year: 3402 Days

Day: 10 Hours

Environment

Temp: -130 °C

Axial Tilt: 13.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 71,729,407 km

• M1: 117,135 km (0.114 R)
• M2: 202,556 km (0.11 R)
• M3: 336,894 km (0.068 R)
• M4: 400,473 km (0.025 R)
• M5: 468,989 km (0.08 R)
• M6: 560,842 km (0.088 R)
• M7: 619,335 km (0.074 R)
• M8: 1,015,022 km (0.044 R)
• M9: 1,304,493 km (0.098 R)
• M10: 1,411,306 km (0.076 R)
• M11: 1,479,523 km (0.101 R)
• M12: 1,837,511 km (0.088 R)
• M13: 1,912,459 km (0.083 R)
• M14: 2,143,289 km (0.098 R)
• M15: 2,222,127 km (0.099 R)
• M16: 2,750,506 km (0.104 R)
• M17: 2,906,088 km (0.066 R)
• M18: 3,100,117 km (0.077 R)
• M19: 3,745,781 km (0.066 R)
• M20: 3,899,119 km (0.063 R)
• M21: 4,074,148 km (0.064 R)
• M22: 4,212,078 km (0.104 R)
• M23: 4,492,574 km (0.057 R)
• M24: 4,779,203 km (0.077 R)
• M25: 4,862,230 km (0.105 R)
• M26: 5,114,153 km (0.047 R)
• M27: 5,587,181 km (0.117 R)
• M28: 5,718,528 km (0.056 R)
• M29: 6,164,031 km (0.109 R)
• M30: 6,345,493 km (0.102 R)
• M31: 6,436,748 km (0.091 R)
• M32: 6,690,316 km (0.092 R)
• M33: 6,947,026 km (0.089 R)
• M34: 7,135,818 km (0.075 R)
• M35: 7,422,298 km (0.04 R)
• M36: 8,254,063 km (0.045 R)
• M37: 8,630,301 km (0.071 R)
• M38: 8,858,887 km (0.112 R)
• M39: 9,478,072 km (0.103 R)
• M40: 9,530,282 km (0.069 R)
• M41: 9,925,071 km (0.061 R)
• M42: 10,057,764 km (0.108 R)
• M43: 10,325,095 km (0.089 R)
• M44: 10,567,743 km (0.114 R)
• M45: 11,168,827 km (0.073 R)
• M46: 11,501,234 km (0.057 R)
• M47: 12,176,070 km (0.112 R)
• M48: 12,777,005 km (0.062 R)
• M49: 13,183,013 km (0.071 R)
• M50: 13,241,356 km (0.046 R)
• M51: 13,416,984 km (0.057 R)
• M52: 13,799,955 km (0.042 R)
• M53: 14,067,286 km (0.087 R)
• M54: 14,697,692 km (0.104 R)
• M55: 14,788,498 km (0.101 R)
• M56: 14,879,453 km (0.044 R)
• M57: 15,061,962 km (0.077 R)
• M58: 15,521,527 km (0.11 R)
• M59: 15,614,128 km (0.104 R)
• M60: 16,079,228 km (0.058 R)
• M61: 16,454,569 km (0.105 R)
• M62: 16,832,902 km (0.093 R)
• M63: 17,309,820 km (0.051 R)
• M64: 17,405,712 km (0.111 R)
• M65: 17,533,918 km (0.119 R)
• M66: 17,598,095 km (0.037 R)
• M67: 18,082,194 km (0.108 R)
• M68: 18,211,895 km (0.047 R)
• M69: 18,309,433 km (0.079 R)
• M70: 18,668,767 km (0.052 R)
• M71: 18,767,053 km (0.052 R)
• M72: 19,693,512 km (0.095 R)
• M73: 20,770,617 km (0.06 R)
• M74: 20,872,493 km (0.118 R)
• M75: 21,728,492 km (0.066 R)
• M76: 21,866,571 km (0.096 R)
• M77: 22,911,063 km (0.109 R)
• M78: 23,157,152 km (0.03 R)
• M79: 23,545,658 km (0.078 R)

Planet 4 - Gas Giant

Semi-Major Axis: 7.52 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 202.8

Radius: 14.5

Gravity: 0.96 G

Time & Orbit

Eccentricity (e): 0.203

Orbit Range: 5.99 AU - 9.05 AU

Year: 7896 Days

Day: 14.2 Hours

Environment

Temp: -164 °C

Axial Tilt: 7.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 71,729,407 km

• M1: 187,147 km (0.108 R)
• M2: 281,094 km (0.066 R)
• M3: 373,247 km (0.117 R)
• M4: 511,176 km (0.08 R)
• M5: 639,980 km (0.083 R)
• M6: 840,291 km (0.097 R)
• M7: 1,155,943 km (0.097 R)
• M8: 1,307,336 km (0.037 R)
• M9: 1,555,070 km (0.103 R)
• M10: 1,677,291 km (0.096 R)
• M11: 1,834,668 km (0.06 R)
• M12: 1,997,431 km (0.064 R)
• M13: 2,696,651 km (0.057 R)
• M14: 3,589,601 km (0.12 R)
• M15: 3,753,859 km (0.098 R)
• M16: 4,305,277 km (0.073 R)
• M17: 4,657,431 km (0.111 R)
• M18: 4,996,270 km (0.079 R)
• M19: 5,460,621 km (0.11 R)
• M20: 5,555,167 km (0.06 R)
• M21: 5,793,926 km (0.084 R)
• M22: 6,109,577 km (0.045 R)
• M23: 6,331,580 km (0.067 R)
• M24: 6,455,896 km (0.1 R)
• M25: 6,581,259 km (0.073 R)
• M26: 7,116,221 km (0.047 R)
• M27: 7,219,743 km (0.082 R)
• M28: 7,506,971 km (0.108 R)
• M29: 8,146,950 km (0.091 R)
• M30: 8,971,684 km (0.101 R)
• M31: 9,851,917 km (0.096 R)
• M32: 10,346,338 km (0.072 R)
• M33: 10,611,426 km (0.082 R)
• M34: 10,848,838 km (0.089 R)
• M35: 11,480,739 km (0.094 R)
• M36: 11,785,919 km (0.053 R)
• M37: 12,654,484 km (0.065 R)
• M38: 13,543,843 km (0.11 R)
• M39: 13,704,811 km (0.074 R)
• M40: 14,061,153 km (0.108 R)
• M41: 14,256,827 km (0.049 R)
• M42: 14,683,779 km (0.061 R)
• M43: 15,215,151 km (0.049 R)
• M44: 15,349,041 km (0.11 R)
• M45: 15,516,890 km (0.047 R)
• M46: 15,719,146 km (0.04 R)
• M47: 15,854,532 km (0.104 R)
• M48: 16,502,590 km (0.038 R)
• M49: 16,709,035 km (0.068 R)
• M50: 16,950,935 km (0.081 R)
• M51: 17,089,762 km (0.084 R)
• M52: 17,473,330 km (0.055 R)
• M53: 19,000,276 km (0.081 R)
• M54: 19,144,488 km (0.099 R)
• M55: 19,361,555 km (0.103 R)
• M56: 19,652,074 km (0.109 R)
• M57: 19,980,740 km (0.057 R)
• M58: 20,311,352 km (0.103 R)
• M59: 21,089,560 km (0.054 R)
• M60: 21,613,900 km (0.065 R)
• M61: 22,028,735 km (0.094 R)
• M62: 22,370,267 km (0.038 R)
• M63: 22,560,705 km (0.05 R)
• M64: 23,097,014 km (0.099 R)
• M65: 23,443,931 km (0.113 R)
• M66: 23,753,748 km (0.094 R)
• M67: 23,909,180 km (0.096 R)
• M68: 24,730,772 km (0.11 R)
• M69: 25,164,755 km (0.087 R)
• M70: 25,402,616 km (0.119 R)
• M71: 26,040,352 km (0.108 R)

Planet 5 - Ice Giant

Semi-Major Axis: 11.94 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 733.3

Radius: 4.7

Gravity: 33.2 G

Time & Orbit

Eccentricity (e): 0.118

Orbit Range: 10.53 AU - 13.35 AU

Year: 15797 Days

Day: 23.4 Hours

Environment

Temp: -185 °C

Axial Tilt: 23.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 71,729,407 km

• M1: 246,388 km (0.111 R)
• M2: 493,523 km (0.085 R)
• M3: 986,598 km (0.09 R)
• M4: 1,478,326 km (0.108 R)
• M5: 1,533,977 km (0.077 R)
• M6: 2,191,459 km (0.08 R)
• M7: 2,482,726 km (0.06 R)
• M8: 2,649,977 km (0.116 R)
• M9: 2,683,786 km (0.104 R)
• M10: 2,820,817 km (0.101 R)
• M11: 3,101,463 km (0.119 R)
• M12: 3,209,174 km (0.088 R)
• M13: 3,576,735 km (0.088 R)
• M14: 3,689,532 km (0.062 R)
• M15: 3,727,530 km (0.082 R)
• M16: 4,074,298 km (0.096 R)
• M17: 4,351,204 km (0.056 R)
• M18: 4,839,940 km (0.1 R)
• M19: 5,432,048 km (0.107 R)
• M20: 5,475,132 km (0.113 R)
• M21: 6,271,442 km (0.107 R)
• M22: 6,362,098 km (0.078 R)
• M23: 6,915,461 km (0.094 R)
• M24: 7,340,468 km (0.084 R)
• M25: 7,822,622 km (0.113 R)
• M26: 8,116,881 km (0.049 R)
• M27: 8,564,927 km (0.094 R)
• M28: 8,969,888 km (0.076 R)
• M29: 9,174,837 km (0.105 R)
• M30: 9,589,224 km (0.113 R)
• M31: 9,641,433 km (0.099 R)
• M32: 11,251,555 km (0.079 R)
• M33: 11,527,862 km (0.077 R)
• M34: 12,030,960 km (0.053 R)
• M35: 12,484,092 km (0.112 R)
• M36: 12,827,718 km (0.113 R)
• M37: 13,641,381 km (0.11 R)
• M38: 13,936,089 km (0.11 R)
• M39: 13,995,180 km (0.046 R)
• M40: 14,292,281 km (0.114 R)
• M41: 14,832,479 km (0.083 R)
• M42: 15,501,631 km (0.105 R)
• M43: 15,809,054 km (0.043 R)
• M44: 18,534,727 km (0.099 R)
• M45: 19,585,353 km (0.076 R)
• M46: 19,917,610 km (0.086 R)
• M47: 20,520,340 km (0.106 R)
• M48: 21,265,188 km (0.095 R)
• M49: 21,538,204 km (0.078 R)
• M50: 21,950,047 km (0.088 R)
• M51: 22,433,697 km (0.071 R)
• M52: 22,920,787 km (0.03 R)
• M53: 23,411,468 km (0.032 R)
• M54: 24,047,409 km (0.106 R)
• M55: 24,331,794 km (0.11 R)
• M56: 24,474,511 km (0.097 R)
• M57: 25,916,186 km (0.09 R)
• M58: 27,236,985 km (0.077 R)
• M59: 27,385,087 km (0.086 R)
• M60: 28,805,519 km (0.112 R)
• M61: 29,791,070 km (0.114 R)
• M62: 30,864,733 km (0.106 R)
• M63: 31,951,113 km (0.079 R)
• M64: 32,734,707 km (0.095 R)
• M65: 34,240,858 km (0.099 R)
• M66: 34,721,067 km (0.066 R)
• M67: 34,801,401 km (0.052 R)
• M68: 35,931,613 km (0.101 R)
• M69: 36,909,983 km (0.1 R)
• M70: 37,567,017 km (0.115 R)
• M71: 38,227,941 km (0.086 R)
• M72: 38,476,722 km (0.114 R)
• M73: 39,981,078 km (0.086 R)
• M74: 43,219,423 km (0.047 R)
• M75: 43,478,676 km (0.109 R)
• M76: 44,346,494 km (0.082 R)
• M77: 44,782,571 km (0.083 R)
• M78: 44,957,302 km (0.09 R)
• M79: 48,590,735 km (0.027 R)
• M80: 49,130,334 km (0.08 R)
• M81: 51,399,884 km (0.088 R)
• M82: 52,870,131 km (0.114 R)
• M83: 53,054,885 km (0.115 R)
• M84: 54,634,040 km (0.055 R)
• M85: 56,228,604 km (0.091 R)
• M86: 59,367,167 km (0.071 R)
• M87: 60,136,698 km (0.116 R)
• M88: 60,426,021 km (0.061 R)
• M89: 60,522,511 km (0.106 R)
• M90: 61,102,951 km (0.116 R)
• M91: 61,588,097 km (0.108 R)
• M92: 61,977,201 km (0.042 R)
• M93: 64,131,261 km (0.097 R)
• M94: 64,624,335 km (0.038 R)
• M95: 65,415,708 km (0.118 R)
• M96: 66,409,487 km (0.033 R)

Planet 6 - Ice Giant

Semi-Major Axis: 13.12 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 227

Radius: 6.6

Gravity: 5.21 G

Time & Orbit

Eccentricity (e): 0.071

Orbit Range: 12.19 AU - 14.05 AU

Year: 18196 Days

Day: 24.8 Hours

Environment

Temp: -199 °C

Axial Tilt: 12.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 71,729,407 km

• M1: 83,625 km (0.033 R)
• M2: 243,097 km (0.087 R)
• M3: 405,261 km (0.116 R)
• M4: 553,213 km (0.028 R)
• M5: 650,601 km (0.066 R)
• M6: 701,464 km (0.053 R)
• M7: 996,172 km (0.118 R)
• M8: 1,116,150 km (0.101 R)
• M9: 1,436,888 km (0.111 R)
• M10: 1,596,209 km (0.068 R)
• M11: 1,882,689 km (0.072 R)
• M12: 2,449,067 km (0.064 R)
• M13: 4,663,115 km (0.077 R)
• M14: 4,831,712 km (0.106 R)
• M15: 5,140,332 km (0.063 R)
• M16: 5,314,614 km (0.113 R)
• M17: 5,597,354 km (0.098 R)
• M18: 5,740,669 km (0.08 R)
• M19: 6,362,996 km (0.09 R)
• M20: 7,083,609 km (0.051 R)
• M21: 7,909,838 km (0.098 R)
• M22: 8,191,979 km (0.113 R)
• M23: 8,436,572 km (0.094 R)
• M24: 8,724,847 km (0.069 R)
• M25: 9,184,412 km (0.048 R)
• M26: 9,438,429 km (0.036 R)
• M27: 9,651,905 km (0.055 R)
• M28: 11,235,249 km (0.114 R)
• M29: 11,325,606 km (0.106 R)
• M30: 13,134,244 km (0.059 R)
• M31: 13,181,816 km (0.066 R)
• M32: 13,853,511 km (0.069 R)
• M33: 14,389,071 km (0.079 R)
• M34: 14,438,139 km (0.109 R)
• M35: 15,681,746 km (0.069 R)
• M36: 16,546,871 km (0.118 R)
• M37: 17,375,194 km (0.05 R)
• M38: 17,531,973 km (0.046 R)
• M39: 17,584,332 km (0.079 R)
• M40: 17,689,200 km (0.087 R)
• M41: 18,058,109 km (0.076 R)
• M42: 18,216,832 km (0.073 R)
• M43: 18,856,961 km (0.039 R)
• M44: 19,018,078 km (0.058 R)
• M45: 19,939,900 km (0.033 R)
• M46: 20,268,716 km (0.117 R)
• M47: 20,433,872 km (0.105 R)
• M48: 20,765,381 km (0.112 R)
• M49: 21,265,936 km (0.09 R)
• M50: 21,433,785 km (0.12 R)
• M51: 22,449,404 km (0.097 R)
• M52: 22,506,401 km (0.068 R)
• M53: 22,620,245 km (0.045 R)
• M54: 22,791,535 km (0.099 R)
• M55: 23,077,865 km (0.036 R)
• M56: 23,538,627 km (0.043 R)
• M57: 23,770,054 km (0.053 R)
• M58: 23,828,098 km (0.098 R)
• M59: 24,410,483 km (0.084 R)
• M60: 25,292,961 km (0.111 R)
• M61: 25,352,202 km (0.117 R)
• M62: 26,185,910 km (0.06 R)
• M63: 26,786,845 km (0.103 R)
• M64: 27,028,595 km (0.079 R)
• M65: 27,696,849 km (0.028 R)
• M66: 28,370,638 km (0.104 R)
• M67: 28,678,660 km (0.073 R)
• M68: 29,984,500 km (0.089 R)
• M69: 30,298,356 km (0.092 R)
• M70: 31,883,345 km (0.103 R)
• M71: 32,847,354 km (0.119 R)
• M72: 33,560,338 km (0.071 R)
• M73: 35,464,419 km (0.084 R)
• M74: 35,530,691 km (0.076 R)
• M75: 35,729,806 km (0.099 R)
• M76: 36,129,083 km (0.092 R)
• M77: 37,673,232 km (0.095 R)
• M78: 37,740,850 km (0.112 R)
• M79: 38,079,689 km (0.069 R)
• M80: 39,170,407 km (0.084 R)
• M81: 41,801,983 km (0.119 R)
• M82: 42,785,889 km (0.098 R)
• M83: 42,997,570 km (0.12 R)
• M84: 44,847,946 km (0.109 R)
• M85: 45,278,638 km (0.091 R)
• M86: 45,782,783 km (0.07 R)
• M87: 45,854,889 km (0.111 R)
• M88: 46,144,062 km (0.084 R)
• M89: 47,671,605 km (0.109 R)
• M90: 47,744,759 km (0.093 R)
• M91: 47,964,518 km (0.037 R)
• M92: 48,111,124 km (0.086 R)
• M93: 48,846,697 km (0.116 R)

Planet 7 - Ice Giant

Semi-Major Axis: 14.91 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 472.4

Radius: 6.9

Gravity: 9.92 G

Time & Orbit

Eccentricity (e): 0.183

Orbit Range: 12.18 AU - 17.64 AU

Year: 22044 Days

Day: 19.6 Hours

Environment

Temp: -197 °C

Axial Tilt: 45.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 71,729,407 km

• M1: 386,112 km (0.099 R)
• M2: 595,699 km (0.109 R)
• M3: 1,469,949 km (0.075 R)
• M4: 1,676,693 km (0.113 R)
• M5: 1,768,097 km (0.106 R)
• M6: 1,924,277 km (0.099 R)
• M7: 2,250,251 km (0.065 R)
• M8: 2,488,710 km (0.116 R)
• M9: 2,735,247 km (0.11 R)
• M10: 3,328,403 km (0.111 R)
• M11: 4,082,526 km (0.106 R)
• M12: 4,164,954 km (0.052 R)
• M13: 4,671,044 km (0.08 R)
• M14: 4,931,344 km (0.042 R)
• M15: 6,066,194 km (0.097 R)
• M16: 6,302,558 km (0.108 R)
• M17: 6,980,386 km (0.12 R)
• M18: 7,378,017 km (0.107 R)
• M19: 7,732,116 km (0.069 R)
• M20: 9,529,235 km (0.11 R)
• M21: 10,417,547 km (0.037 R)
• M22: 10,986,318 km (0.106 R)
• M23: 11,858,025 km (0.115 R)
• M24: 15,239,535 km (0.115 R)
• M25: 15,689,974 km (0.095 R)
• M26: 16,275,500 km (0.097 R)
• M27: 16,406,548 km (0.098 R)
• M28: 16,472,222 km (0.118 R)
• M29: 16,538,045 km (0.04 R)
• M30: 17,067,322 km (0.092 R)
• M31: 18,414,600 km (0.111 R)
• M32: 18,482,967 km (0.089 R)
• M33: 18,688,215 km (0.104 R)
• M34: 19,239,333 km (0.075 R)
• M35: 19,656,263 km (0.091 R)
• M36: 20,711,376 km (0.066 R)
• M37: 20,782,435 km (0.114 R)
• M38: 22,219,323 km (0.08 R)
• M39: 23,688,075 km (0.047 R)
• M40: 25,415,631 km (0.08 R)
• M41: 27,729,162 km (0.093 R)
• M42: 28,199,947 km (0.119 R)
• M43: 28,357,473 km (0.111 R)
• M44: 29,228,881 km (0.119 R)
• M45: 29,788,078 km (0.108 R)
• M46: 30,028,781 km (0.089 R)
• M47: 30,350,715 km (0.104 R)
• M48: 30,431,498 km (0.085 R)
• M49: 30,512,131 km (0.119 R)
• M50: 31,160,638 km (0.07 R)
• M51: 31,486,612 km (0.041 R)
• M52: 33,716,219 km (0.045 R)
• M53: 34,134,793 km (0.114 R)
• M54: 34,892,357 km (0.114 R)
• M55: 36,338,370 km (0.067 R)
• M56: 36,767,267 km (0.097 R)
• M57: 37,803,831 km (0.107 R)
• M58: 38,412,844 km (0.097 R)
• M59: 39,817,119 km (0.102 R)
• M60: 42,947,006 km (0.093 R)
• M61: 43,309,780 km (0.082 R)
• M62: 43,491,542 km (0.093 R)
• M63: 44,220,981 km (0.06 R)
• M64: 44,495,643 km (0.101 R)
• M65: 47,179,279 km (0.118 R)
• M66: 47,553,423 km (0.116 R)
• M67: 49,819,532 km (0.097 R)
• M68: 50,200,707 km (0.085 R)
• M69: 50,965,751 km (0.092 R)
• M70: 52,701,385 km (0.056 R)
• M71: 54,064,521 km (0.111 R)
• M72: 54,358,181 km (0.066 R)
• M73: 58,725,243 km (0.105 R)
• M74: 58,926,302 km (0.085 R)
• M75: 59,531,276 km (0.054 R)
• M76: 60,747,207 km (0.042 R)
• M77: 60,848,784 km (0.028 R)
• M78: 61,868,892 km (0.113 R)
• M79: 62,176,017 km (0.085 R)
• M80: 64,547,442 km (0.106 R)
• M81: 66,528,716 km (0.104 R)
• M82: 66,738,303 km (0.114 R)
• M83: 67,684,809 km (0.118 R)
• M84: 68,106,824 km (0.101 R)

Kuiper Belt

Range: 30 - 54 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 219 - 15,685 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit