🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 1.12 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.72

Radius: 1.69

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.12

Orbit Range: 0.99 AU - 1.25 AU

Year: 419 Days

Day: 13.3 Hours

Environment

Temp: 34 °C

Axial Tilt: 27 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Satellites (1)

Outer Limit: 102,794,018 km

• M1: 882,627 km (0.066 R)

Asteroid Belt

Center: 3.78 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 2 - Gas Giant

Semi-Major Axis: 6.43 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 904.2

Radius: 12.5

Gravity: 5.79 G

Time & Orbit

Eccentricity (e): 0.158

Orbit Range: 5.41 AU - 7.45 AU

Year: 5757 Days

Day: 10.6 Hours

Environment

Temp: -154 °C

Axial Tilt: 20.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 102,794,018 km

• M1: 156,629 km (0.062 R)
• M2: 235,766 km (0.11 R)
• M3: 343,776 km (0.119 R)
• M4: 572,810 km (0.079 R)
• M5: 855,401 km (0.065 R)
• M6: 975,378 km (0.027 R)
• M7: 1,388,268 km (0.119 R)
• M8: 1,756,728 km (0.1 R)
• M9: 1,853,817 km (0.097 R)
• M10: 2,012,989 km (0.12 R)
• M11: 2,388,031 km (0.04 R)
• M12: 2,830,841 km (0.077 R)
• M13: 3,180,002 km (0.046 R)
• M14: 3,347,701 km (0.114 R)
• M15: 3,494,008 km (0.071 R)
• M16: 3,692,225 km (0.114 R)
• M17: 3,919,913 km (0.044 R)
• M18: 4,309,615 km (0.105 R)
• M19: 4,389,052 km (0.082 R)
• M20: 4,986,845 km (0.088 R)
• M21: 5,210,643 km (0.101 R)
• M22: 5,872,614 km (0.027 R)
• M23: 6,530,845 km (0.099 R)
• M24: 6,622,399 km (0.108 R)
• M25: 7,884,257 km (0.1 R)
• M26: 8,014,556 km (0.107 R)
• M27: 8,946,401 km (0.119 R)
• M28: 9,356,300 km (0.069 R)
• M29: 9,807,337 km (0.054 R)
• M30: 10,088,432 km (0.087 R)
• M31: 10,479,331 km (0.092 R)
• M32: 10,838,964 km (0.052 R)
• M33: 11,239,288 km (0.106 R)
• M34: 11,386,193 km (0.061 R)
• M35: 11,793,099 km (0.084 R)
• M36: 12,204,942 km (0.116 R)
• M37: 13,624,776 km (0.108 R)
• M38: 14,056,814 km (0.053 R)
• M39: 14,334,318 km (0.083 R)
• M40: 14,573,376 km (0.094 R)
• M41: 14,854,171 km (0.102 R)
• M42: 15,055,829 km (0.094 R)
• M43: 15,298,925 km (0.05 R)
• M44: 15,420,997 km (0.069 R)
• M45: 16,036,293 km (0.072 R)
• M46: 16,326,064 km (0.118 R)
• M47: 17,290,821 km (0.07 R)
• M48: 17,886,969 km (0.084 R)
• M49: 18,187,660 km (0.072 R)
• M50: 18,924,729 km (0.038 R)
• M51: 19,187,273 km (0.096 R)
• M52: 19,539,127 km (0.039 R)
• M53: 19,893,226 km (0.069 R)
• M54: 20,070,948 km (0.104 R)
• M55: 21,058,443 km (0.104 R)
• M56: 21,285,084 km (0.065 R)
• M57: 21,603,728 km (0.082 R)
• M58: 23,220,581 km (0.104 R)
• M59: 23,972,760 km (0.11 R)
• M60: 24,162,001 km (0.076 R)
• M61: 24,494,407 km (0.113 R)
• M62: 24,876,181 km (0.056 R)
• M63: 25,404,411 km (0.119 R)
• M64: 25,645,713 km (0.059 R)
• M65: 25,742,353 km (0.11 R)
• M66: 27,060,160 km (0.074 R)
• M67: 27,306,698 km (0.116 R)
• M68: 28,050,498 km (0.082 R)
• M69: 28,750,766 km (0.101 R)
• M70: 28,851,296 km (0.103 R)
• M71: 29,406,154 km (0.115 R)
• M72: 30,321,843 km (0.047 R)
• M73: 32,233,255 km (0.114 R)
• M74: 32,599,321 km (0.114 R)
• M75: 32,756,548 km (0.06 R)
• M76: 33,177,217 km (0.097 R)
• M77: 33,493,916 km (0.112 R)
• M78: 33,705,597 km (0.075 R)
• M79: 34,023,941 km (0.107 R)
• M80: 34,503,253 km (0.069 R)
• M81: 34,984,958 km (0.071 R)
• M82: 35,307,341 km (0.089 R)
• M83: 36,009,105 km (0.07 R)
• M84: 36,388,784 km (0.104 R)

Planet 3 - Gas Giant

Semi-Major Axis: 6.65 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 429.4

Radius: 11.4

Gravity: 3.3 G

Time & Orbit

Eccentricity (e): 0.047

Orbit Range: 6.34 AU - 6.96 AU

Year: 6055 Days

Day: 8.3 Hours

Environment

Temp: -145 °C

Axial Tilt: 10.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 102,794,018 km

• M1: 230,680 km (0.035 R)
• M2: 358,287 km (0.1 R)
• M3: 468,391 km (0.113 R)
• M4: 753,973 km (0.08 R)
• M5: 930,648 km (0.116 R)
• M6: 1,024,446 km (0.113 R)
• M7: 1,107,623 km (0.069 R)
• M8: 1,623,436 km (0.069 R)
• M9: 2,354,670 km (0.107 R)
• M10: 2,600,011 km (0.108 R)
• M11: 2,755,294 km (0.087 R)
• M12: 3,034,443 km (0.078 R)
• M13: 3,156,964 km (0.09 R)
• M14: 3,260,336 km (0.059 R)
• M15: 3,620,268 km (0.116 R)
• M16: 3,838,083 km (0.118 R)
• M17: 3,993,216 km (0.113 R)
• M18: 5,431,151 km (0.089 R)
• M19: 5,605,582 km (0.069 R)
• M20: 5,858,103 km (0.083 R)
• M21: 6,011,441 km (0.066 R)
• M22: 6,192,155 km (0.062 R)
• M23: 6,374,515 km (0.092 R)
• M24: 6,691,363 km (0.051 R)
• M25: 6,824,954 km (0.075 R)
• M26: 6,932,515 km (0.054 R)
• M27: 7,040,525 km (0.044 R)
• M28: 7,203,736 km (0.082 R)
• M29: 7,285,715 km (0.117 R)
• M30: 7,478,398 km (0.105 R)
• M31: 7,561,574 km (0.094 R)
• M32: 8,352,049 km (0.099 R)
• M33: 8,698,967 km (0.063 R)
• M34: 8,815,653 km (0.064 R)
• M35: 9,228,244 km (0.096 R)
• M36: 9,647,118 km (0.118 R)
• M37: 9,737,625 km (0.105 R)
• M38: 9,828,580 km (0.12 R)
• M39: 9,950,203 km (0.062 R)
• M40: 10,164,128 km (0.038 R)
• M41: 11,035,386 km (0.088 R)
• M42: 11,704,537 km (0.114 R)
• M43: 12,060,281 km (0.115 R)
• M44: 12,419,615 km (0.082 R)
• M45: 12,749,329 km (0.101 R)
• M46: 13,148,755 km (0.054 R)
• M47: 13,316,454 km (0.072 R)
• M48: 13,417,433 km (0.074 R)
• M49: 13,552,520 km (0.074 R)
• M50: 14,303,052 km (0.084 R)
• M51: 14,510,096 km (0.08 R)
• M52: 14,683,480 km (0.067 R)
• M53: 15,172,515 km (0.106 R)
• M54: 16,634,984 km (0.099 R)
• M55: 17,511,927 km (0.11 R)
• M56: 17,733,631 km (0.113 R)
• M57: 17,881,882 km (0.112 R)
• M58: 18,403,979 km (0.05 R)
• M59: 18,554,026 km (0.051 R)
• M60: 19,082,555 km (0.099 R)
• M61: 19,310,692 km (0.062 R)
• M62: 19,501,429 km (0.035 R)
• M63: 19,923,145 km (0.072 R)
• M64: 20,348,003 km (0.09 R)
• M65: 20,853,943 km (0.063 R)
• M66: 20,932,183 km (0.088 R)
• M67: 21,128,156 km (0.073 R)
• M68: 21,364,072 km (0.081 R)
• M69: 22,396,596 km (0.112 R)
• M70: 23,364,195 km (0.066 R)
• M71: 23,567,499 km (0.068 R)
• M72: 24,427,687 km (0.095 R)
• M73: 24,675,271 km (0.029 R)
• M74: 25,089,956 km (0.052 R)
• M75: 26,010,283 km (0.115 R)
• M76: 26,941,679 km (0.112 R)
• M77: 27,069,585 km (0.106 R)
• M78: 27,154,856 km (0.078 R)
• M79: 27,283,061 km (0.067 R)
• M80: 27,540,070 km (0.046 R)

Planet 4 - Gas Giant

Semi-Major Axis: 12.48 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 372.5

Radius: 9.3

Gravity: 4.31 G

Time & Orbit

Eccentricity (e): 0.115

Orbit Range: 11.04 AU - 13.92 AU

Year: 15568 Days

Day: 6.5 Hours

Environment

Temp: -178 °C

Axial Tilt: 32.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 102,794,018 km

• M1: 134,189 km (0.065 R)
• M2: 202,556 km (0.115 R)
• M3: 322,982 km (0.116 R)
• M4: 566,976 km (0.087 R)
• M5: 1,749,098 km (0.12 R)
• M6: 2,134,014 km (0.118 R)
• M7: 2,516,984 km (0.116 R)
• M8: 3,598,278 km (0.113 R)
• M9: 3,791,109 km (0.077 R)
• M10: 4,120,075 km (0.075 R)
• M11: 4,187,095 km (0.045 R)
• M12: 4,492,723 km (0.06 R)
• M13: 4,596,245 km (0.064 R)
• M14: 4,700,664 km (0.1 R)
• M15: 4,805,682 km (0.109 R)
• M16: 4,876,292 km (0.041 R)
• M17: 5,306,685 km (0.11 R)
• M18: 5,786,894 km (0.086 R)
• M19: 6,089,232 km (0.088 R)
• M20: 6,396,955 km (0.069 R)
• M21: 6,947,475 km (0.119 R)
• M22: 7,067,452 km (0.092 R)
• M23: 7,513,254 km (0.08 R)
• M24: 8,517,355 km (0.072 R)
• M25: 10,282,909 km (0.108 R)
• M26: 11,821,673 km (0.028 R)
• M27: 11,917,116 km (0.109 R)
• M28: 12,886,809 km (0.119 R)
• M29: 13,580,644 km (0.066 R)
• M30: 13,932,199 km (0.105 R)
• M31: 14,083,742 km (0.113 R)
• M32: 14,337,460 km (0.114 R)
• M33: 14,952,906 km (0.103 R)
• M34: 16,689,138 km (0.107 R)
• M35: 17,227,691 km (0.045 R)
• M36: 18,654,854 km (0.109 R)
• M37: 19,326,250 km (0.104 R)
• M38: 19,891,730 km (0.118 R)
• M39: 22,800,211 km (0.102 R)
• M40: 24,303,520 km (0.078 R)
• M41: 24,913,730 km (0.106 R)
• M42: 25,900,627 km (0.046 R)
• M43: 26,711,897 km (0.098 R)
• M44: 26,900,390 km (0.118 R)
• M45: 27,026,202 km (0.043 R)
• M46: 28,359,418 km (0.117 R)
• M47: 29,066,268 km (0.094 R)
• M48: 30,170,151 km (0.036 R)
• M49: 30,825,838 km (0.12 R)
• M50: 31,089,429 km (0.102 R)
• M51: 31,618,856 km (0.105 R)
• M52: 31,951,263 km (0.094 R)
• M53: 32,753,855 km (0.069 R)
• M54: 33,360,176 km (0.106 R)
• M55: 34,174,287 km (0.068 R)
• M56: 34,447,154 km (0.103 R)
• M57: 34,789,134 km (0.077 R)
• M58: 35,063,647 km (0.118 R)
• M59: 35,201,127 km (0.081 R)
• M60: 36,655,667 km (0.116 R)
• M61: 37,285,025 km (0.043 R)
• M62: 38,412,844 km (0.11 R)
• M63: 39,266,000 km (0.114 R)
• M64: 39,623,240 km (0.092 R)
• M65: 40,053,483 km (0.074 R)
• M66: 40,197,247 km (0.105 R)
• M67: 40,341,160 km (0.07 R)
• M68: 40,629,435 km (0.12 R)
• M69: 42,960,918 km (0.097 R)
• M70: 43,107,973 km (0.063 R)
• M71: 43,476,582 km (0.078 R)
• M72: 43,846,238 km (0.106 R)
• M73: 44,068,541 km (0.111 R)
• M74: 44,588,693 km (0.086 R)
• M75: 46,992,431 km (0.106 R)
• M76: 48,209,859 km (0.098 R)
• M77: 48,362,897 km (0.043 R)
• M78: 48,439,342 km (0.117 R)
• M79: 50,675,980 km (0.101 R)
• M80: 50,831,561 km (0.098 R)
• M81: 51,298,905 km (0.044 R)
• M82: 51,611,265 km (0.103 R)
• M83: 51,689,505 km (0.115 R)

Asteroid Belt

Center: 12.81 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 5 - Ice Giant

Semi-Major Axis: 13.14 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 452.5

Radius: 3.3

Gravity: 41.55 G

Time & Orbit

Eccentricity (e): 0.022

Orbit Range: 12.85 AU - 13.43 AU

Year: 16819 Days

Day: 24.2 Hours

Environment

Temp: -175 °C

Axial Tilt: 21 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 102,794,018 km

• M1: 61,934 km (0.095 R)
• M2: 548,875 km (0.088 R)
• M3: 740,659 km (0.057 R)
• M4: 781,350 km (0.111 R)
• M5: 822,938 km (0.091 R)
• M6: 929,900 km (0.103 R)
• M7: 1,133,653 km (0.106 R)
• M8: 1,376,001 km (0.027 R)
• M9: 1,714,242 km (0.083 R)
• M10: 1,795,922 km (0.116 R)
• M11: 2,252,346 km (0.115 R)
• M12: 2,742,877 km (0.078 R)
• M13: 3,711,224 km (0.063 R)
• M14: 3,781,535 km (0.099 R)
• M15: 4,286,278 km (0.103 R)
• M16: 4,397,130 km (0.084 R)
• M17: 5,517,020 km (0.1 R)
• M18: 5,597,354 km (0.083 R)
• M19: 5,637,745 km (0.082 R)
• M20: 6,421,788 km (0.106 R)
• M21: 8,134,983 km (0.055 R)
• M22: 8,735,468 km (0.049 R)
• M23: 9,207,151 km (0.1 R)
• M24: 9,494,079 km (0.06 R)
• M25: 9,686,911 km (0.049 R)
• M26: 11,123,798 km (0.098 R)
• M27: 11,996,403 km (0.084 R)
• M28: 12,048,463 km (0.073 R)
• M29: 12,467,337 km (0.082 R)
• M30: 13,158,030 km (0.081 R)
• M31: 13,373,002 km (0.072 R)
• M32: 13,427,007 km (0.111 R)
• M33: 14,410,164 km (0.114 R)
• M34: 15,359,961 km (0.094 R)
• M35: 16,967,540 km (0.095 R)
• M36: 18,688,215 km (0.036 R)
• M37: 18,748,503 km (0.113 R)
• M38: 19,233,349 km (0.109 R)
• M39: 19,845,205 km (0.098 R)
• M40: 19,968,324 km (0.076 R)
• M41: 20,587,809 km (0.026 R)
• M42: 20,712,424 km (0.113 R)
• M43: 20,837,338 km (0.089 R)
• M44: 21,528,779 km (0.096 R)
• M45: 21,782,048 km (0.118 R)
• M46: 22,100,093 km (0.078 R)
• M47: 22,934,102 km (0.031 R)
• M48: 24,040,079 km (0.041 R)
• M49: 24,302,772 km (0.114 R)
• M50: 25,030,267 km (0.066 R)
• M51: 25,096,838 km (0.069 R)
• M52: 25,966,450 km (0.08 R)
• M53: 26,438,880 km (0.105 R)
• M54: 26,506,648 km (0.067 R)
• M55: 27,323,752 km (0.078 R)
• M56: 28,495,402 km (0.103 R)
• M57: 28,982,493 km (0.105 R)
• M58: 30,318,701 km (0.119 R)
• M59: 30,744,756 km (0.044 R)
• M60: 31,818,719 km (0.097 R)
• M61: 32,251,655 km (0.106 R)
• M62: 32,977,654 km (0.062 R)
• M63: 33,635,735 km (0.038 R)
• M64: 34,445,807 km (0.066 R)
• M65: 34,519,709 km (0.106 R)
• M66: 34,667,811 km (0.092 R)
• M67: 35,785,157 km (0.057 R)
• M68: 36,611,984 km (0.098 R)
• M69: 37,445,245 km (0.066 R)
• M70: 37,749,676 km (0.115 R)
• M71: 38,131,450 km (0.113 R)
• M72: 39,052,973 km (0.113 R)
• M73: 40,137,408 km (0.06 R)
• M74: 41,703,548 km (0.092 R)
• M75: 42,732,183 km (0.102 R)
• M76: 44,491,903 km (0.108 R)
• M77: 44,572,536 km (0.11 R)
• M78: 45,218,649 km (0.087 R)
• M79: 46,112,197 km (0.105 R)
• M80: 46,275,259 km (0.115 R)
• M81: 49,410,082 km (0.042 R)
• M82: 49,660,509 km (0.048 R)
• M83: 49,995,010 km (0.1 R)
• M84: 50,246,334 km (0.106 R)
• M85: 50,750,330 km (0.079 R)
• M86: 51,678,734 km (0.096 R)
• M87: 52,187,516 km (0.109 R)
• M88: 53,466,578 km (0.11 R)
• M89: 53,552,148 km (0.093 R)
• M90: 54,152,933 km (0.059 R)
• M91: 56,055,519 km (0.057 R)
• M92: 56,403,783 km (0.093 R)
• M93: 58,244,136 km (0.117 R)

Planet 6 - Ice Giant

Semi-Major Axis: 18.44 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 864.2

Radius: 3.2

Gravity: 84.39 G

Time & Orbit

Eccentricity (e): 0.153

Orbit Range: 15.62 AU - 21.26 AU

Year: 27960 Days

Day: 16.7 Hours

Environment

Temp: -198 °C

Axial Tilt: 12.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 102,794,018 km

• M1: 113,395 km (0.052 R)
• M2: 174,880 km (0.114 R)
• M3: 861,833 km (0.096 R)
• M4: 2,631,277 km (0.042 R)
• M5: 2,722,232 km (0.065 R)
• M6: 3,788,566 km (0.117 R)
• M7: 4,047,071 km (0.054 R)
• M8: 4,152,089 km (0.118 R)
• M9: 4,856,096 km (0.108 R)
• M10: 4,967,696 km (0.047 R)
• M11: 5,831,026 km (0.091 R)
• M12: 6,009,346 km (0.108 R)
• M13: 6,129,025 km (0.04 R)
• M14: 6,801,916 km (0.044 R)
• M15: 8,216,065 km (0.1 R)
• M16: 8,482,648 km (0.082 R)
• M17: 8,956,125 km (0.111 R)
• M18: 10,283,507 km (0.118 R)
• M19: 10,787,802 km (0.059 R)
• M20: 11,596,528 km (0.084 R)
• M21: 11,895,424 km (0.083 R)
• M22: 12,807,074 km (0.071 R)
• M23: 13,898,839 km (0.108 R)
• M24: 14,858,061 km (0.055 R)
• M25: 16,086,857 km (0.067 R)
• M26: 16,503,637 km (0.031 R)
• M27: 16,587,412 km (0.067 R)
• M28: 17,262,846 km (0.064 R)
• M29: 17,347,967 km (0.083 R)
• M30: 17,947,107 km (0.101 R)
• M31: 18,119,593 km (0.109 R)
• M32: 18,466,212 km (0.089 R)
• M33: 18,553,128 km (0.113 R)
• M34: 19,253,994 km (0.095 R)
• M35: 21,682,117 km (0.095 R)
• M36: 23,259,776 km (0.085 R)
• M37: 25,645,862 km (0.113 R)
• M38: 27,015,730 km (0.113 R)
• M39: 27,411,416 km (0.079 R)
• M40: 29,418,571 km (0.041 R)
• M41: 29,825,776 km (0.105 R)
• M42: 30,132,302 km (0.08 R)
• M43: 31,058,164 km (0.09 R)
• M44: 31,784,760 km (0.044 R)
• M45: 32,937,711 km (0.059 R)
• M46: 34,424,864 km (0.062 R)
• M47: 37,024,725 km (0.098 R)
• M48: 37,684,601 km (0.088 R)
• M49: 37,905,408 km (0.055 R)
• M50: 38,126,513 km (0.111 R)
• M51: 38,348,217 km (0.108 R)
• M52: 41,268,368 km (0.066 R)
• M53: 43,100,493 km (0.091 R)
• M54: 43,910,416 km (0.117 R)
• M55: 44,026,504 km (0.096 R)
• M56: 45,076,232 km (0.091 R)
• M57: 47,318,854 km (0.076 R)
• M58: 48,034,679 km (0.048 R)
• M59: 48,874,223 km (0.103 R)
• M60: 50,081,926 km (0.063 R)
• M61: 50,203,250 km (0.083 R)
• M62: 54,510,323 km (0.095 R)
• M63: 56,014,080 km (0.079 R)
• M64: 57,150,725 km (0.079 R)
• M65: 57,404,443 km (0.068 R)
• M66: 58,422,756 km (0.078 R)
• M67: 58,550,363 km (0.065 R)
• M68: 58,934,081 km (0.029 R)
• M69: 60,735,539 km (0.077 R)
• M70: 65,715,652 km (0.12 R)
• M71: 67,583,082 km (0.093 R)
• M72: 70,416,915 km (0.095 R)
• M73: 71,097,286 km (0.088 R)
• M74: 71,233,569 km (0.059 R)
• M75: 71,370,003 km (0.11 R)
• M76: 73,702,682 km (0.116 R)
• M77: 74,531,903 km (0.075 R)
• M78: 74,670,431 km (0.108 R)
• M79: 78,301,470 km (0.119 R)
• M80: 79,854,895 km (0.089 R)
• M81: 81,703,775 km (0.093 R)
• M82: 85,154,100 km (0.069 R)
• M83: 85,298,911 km (0.082 R)
• M84: 90,122,844 km (0.112 R)
• M85: 93,536,817 km (0.098 R)
• M86: 97,446,856 km (0.108 R)
• M87: 98,660,693 km (0.12 R)
• M88: 100,337,835 km (0.083 R)

Kuiper Belt

Range: 31.1 - 53.1 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 396 - 17,598 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit