🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.53 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.56

Radius: 1.66

Gravity: 1.29 G

Time & Orbit

Eccentricity (e): 0.219

Orbit Range: 0.41 AU - 0.65 AU

Year: 253 Days

Day: 27.4 Hours

Environment

Temp: -121 °C

Axial Tilt: 46.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 25,677,924 km

• M1: 96,042 km (0.105 R)

Asteroid Belt

Center: 1 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 2 - Gas Giant

Semi-Major Axis: 1.46 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 363.9

Radius: 15

Gravity: 1.62 G

Time & Orbit

Eccentricity (e): 0.031

Orbit Range: 1.41 AU - 1.51 AU

Year: 1157 Days

Day: 14 Hours

Environment

Temp: -167 °C

Axial Tilt: 45.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (45)

Outer Limit: 25,677,924 km

• M1: 204,799 km (0.077 R)
• M2: 306,227 km (0.103 R)
• M3: 410,347 km (0.116 R)
• M4: 552,615 km (0.076 R)
• M5: 764,595 km (0.097 R)
• M6: 870,660 km (0.103 R)
• M7: 1,000,511 km (0.06 R)
• M8: 1,150,557 km (0.093 R)
• M9: 1,281,904 km (0.079 R)
• M10: 1,377,198 km (0.105 R)
• M11: 1,539,212 km (0.072 R)
• M12: 1,723,068 km (0.062 R)
• M13: 1,844,691 km (0.097 R)
• M14: 1,969,306 km (0.115 R)
• M15: 2,121,298 km (0.103 R)
• M16: 2,235,890 km (0.058 R)
• M17: 2,361,103 km (0.109 R)
• M18: 2,601,357 km (0.047 R)
• M19: 2,967,872 km (0.07 R)
• M20: 3,124,950 km (0.114 R)
• M21: 3,246,872 km (0.053 R)
• M22: 3,360,866 km (0.087 R)
• M23: 3,466,631 km (0.086 R)
• M24: 3,701,351 km (0.076 R)
• M25: 4,311,261 km (0.1 R)
• M26: 4,447,694 km (0.042 R)
• M27: 4,713,979 km (0.075 R)
• M28: 4,941,966 km (0.074 R)
• M29: 5,073,761 km (0.118 R)
• M30: 5,453,890 km (0.06 R)
• M31: 5,578,953 km (0.05 R)
• M32: 5,739,472 km (0.086 R)
• M33: 5,994,835 km (0.114 R)
• M34: 6,337,265 km (0.118 R)
• M35: 6,759,131 km (0.109 R)
• M36: 7,029,006 km (0.101 R)
• M37: 7,128,039 km (0.106 R)
• M38: 7,315,037 km (0.107 R)
• M39: 7,415,417 km (0.106 R)
• M40: 7,516,395 km (0.114 R)
• M41: 7,732,265 km (0.113 R)
• M42: 8,235,363 km (0.115 R)
• M43: 8,510,623 km (0.107 R)
• M44: 8,949,543 km (0.106 R)
• M45: 9,043,490 km (0.062 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 883.9

Radius: 8.5

Gravity: 12.23 G

Time & Orbit

Eccentricity (e): 0.247

Orbit Range: 1.98 AU - 3.28 AU

Year: 2798 Days

Day: 6.3 Hours

Environment

Temp: -209 °C

Axial Tilt: 9.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 25,677,924 km

• M1: 168,597 km (0.11 R)
• M2: 232,924 km (0.111 R)
• M3: 339,288 km (0.065 R)
• M4: 440,416 km (0.108 R)
• M5: 617,839 km (0.049 R)
• M6: 675,883 km (0.102 R)
• M7: 746,045 km (0.067 R)
• M8: 840,142 km (0.071 R)
• M9: 916,287 km (0.091 R)
• M10: 972,237 km (0.053 R)
• M11: 1,244,654 km (0.109 R)
• M12: 1,357,900 km (0.117 R)
• M13: 1,461,571 km (0.117 R)
• M14: 1,621,940 km (0.067 R)
• M15: 1,859,352 km (0.117 R)
• M16: 2,152,863 km (0.065 R)
• M17: 2,320,712 km (0.094 R)
• M18: 2,445,476 km (0.11 R)
• M19: 2,540,471 km (0.034 R)
• M20: 2,652,969 km (0.106 R)
• M21: 2,783,568 km (0.084 R)
• M22: 3,188,230 km (0.066 R)
• M23: 3,292,350 km (0.061 R)
• M24: 3,720,050 km (0.108 R)
• M25: 3,811,455 km (0.092 R)
• M26: 3,959,108 km (0.091 R)
• M27: 4,015,057 km (0.083 R)
• M28: 4,090,006 km (0.104 R)
• M29: 4,375,139 km (0.111 R)
• M30: 4,491,078 km (0.091 R)
• M31: 4,666,855 km (0.085 R)
• M32: 4,944,808 km (0.114 R)
• M33: 5,371,910 km (0.098 R)
• M34: 6,153,260 km (0.079 R)
• M35: 6,568,244 km (0.101 R)
• M36: 6,947,176 km (0.08 R)
• M37: 7,037,383 km (0.047 R)
• M38: 7,105,300 km (0.084 R)
• M39: 7,333,288 km (0.104 R)
• M40: 7,749,768 km (0.047 R)
• M41: 7,961,000 km (0.119 R)
• M42: 8,031,760 km (0.101 R)
• M43: 8,221,600 km (0.1 R)
• M44: 8,800,095 km (0.046 R)
• M45: 9,341,789 km (0.086 R)
• M46: 9,466,404 km (0.116 R)
• M47: 9,541,502 km (0.088 R)
• M48: 9,767,843 km (0.071 R)
• M49: 10,149,019 km (0.104 R)
• M50: 10,380,147 km (0.052 R)
• M51: 10,612,922 km (0.069 R)
• M52: 11,057,377 km (0.112 R)
• M53: 11,481,337 km (0.119 R)
• M54: 11,534,744 km (0.048 R)
• M55: 12,208,682 km (0.059 R)
• M56: 12,372,342 km (0.118 R)
• M57: 12,427,095 km (0.114 R)
• M58: 13,821,198 km (0.042 R)
• M59: 13,906,468 km (0.07 R)
• M60: 14,020,312 km (0.117 R)
• M61: 14,363,939 km (0.119 R)
• M62: 14,768,302 km (0.106 R)
• M63: 15,030,098 km (0.053 R)
• M64: 15,676,810 km (0.092 R)
• M65: 16,063,221 km (0.053 R)
• M66: 16,302,578 km (0.119 R)
• M67: 17,119,232 km (0.109 R)
• M68: 17,180,268 km (0.1 R)
• M69: 17,763,550 km (0.108 R)
• M70: 18,104,185 km (0.119 R)
• M71: 18,290,883 km (0.12 R)
• M72: 18,980,978 km (0.034 R)
• M73: 19,044,108 km (0.084 R)
• M74: 20,064,216 km (0.104 R)
• M75: 20,386,749 km (0.06 R)
• M76: 20,516,151 km (0.117 R)
• M77: 20,678,315 km (0.088 R)
• M78: 20,775,853 km (0.076 R)
• M79: 20,840,928 km (0.117 R)
• M80: 21,397,133 km (0.089 R)
• M81: 21,495,718 km (0.035 R)
• M82: 21,594,602 km (0.047 R)
• M83: 22,057,608 km (0.09 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.79 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 817

Radius: 12.8

Gravity: 4.99 G

Time & Orbit

Eccentricity (e): 0.087

Orbit Range: 2.55 AU - 3.03 AU

Year: 3057 Days

Day: 7.6 Hours

Environment

Temp: -210 °C

Axial Tilt: 17 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 25,677,924 km

• M1: 159,920 km (0.112 R)
• M2: 255,214 km (0.107 R)
• M3: 356,342 km (0.097 R)
• M4: 462,706 km (0.105 R)
• M5: 547,678 km (0.066 R)
• M6: 639,232 km (0.113 R)
• M7: 736,919 km (0.1 R)
• M8: 861,983 km (0.094 R)
• M9: 1,196,035 km (0.082 R)
• M10: 1,333,665 km (0.115 R)
• M11: 1,557,164 km (0.115 R)
• M12: 1,652,907 km (0.11 R)
• M13: 1,793,379 km (0.052 R)
• M14: 2,131,919 km (0.107 R)
• M15: 2,285,556 km (0.09 R)
• M16: 2,653,268 km (0.112 R)
• M17: 2,802,417 km (0.087 R)
• M18: 2,988,517 km (0.119 R)
• M19: 3,231,464 km (0.102 R)
• M20: 3,355,480 km (0.056 R)
• M21: 3,644,803 km (0.113 R)
• M22: 3,923,653 km (0.062 R)
• M23: 4,781,447 km (0.031 R)
• M24: 4,902,921 km (0.049 R)
• M25: 5,045,936 km (0.074 R)
• M26: 5,231,886 km (0.102 R)
• M27: 5,336,156 km (0.062 R)
• M28: 5,441,174 km (0.1 R)
• M29: 6,328,289 km (0.093 R)
• M30: 6,529,049 km (0.101 R)
• M31: 6,641,547 km (0.106 R)
• M32: 6,754,643 km (0.091 R)
• M33: 7,005,818 km (0.108 R)
• M34: 7,213,609 km (0.104 R)
• M35: 7,611,689 km (0.03 R)
• M36: 7,730,171 km (0.091 R)
• M37: 7,944,993 km (0.093 R)
• M38: 8,234,615 km (0.054 R)
• M39: 8,356,238 km (0.079 R)
• M40: 8,478,609 km (0.088 R)
• M41: 8,849,013 km (0.113 R)
• M42: 9,478,222 km (0.115 R)
• M43: 9,811,227 km (0.055 R)
• M44: 10,174,151 km (0.073 R)
• M45: 10,409,768 km (0.092 R)
• M46: 11,506,021 km (0.101 R)
• M47: 11,806,414 km (0.119 R)
• M48: 12,137,025 km (0.088 R)
• M49: 12,248,026 km (0.085 R)
• M50: 12,387,152 km (0.107 R)
• M51: 12,892,344 km (0.058 R)
• M52: 13,232,829 km (0.041 R)
• M53: 13,720,369 km (0.078 R)
• M54: 13,864,880 km (0.116 R)
• M55: 14,126,377 km (0.068 R)
• M56: 14,477,484 km (0.088 R)
• M57: 14,890,673 km (0.097 R)
• M58: 15,880,263 km (0.104 R)
• M59: 15,971,368 km (0.103 R)
• M60: 16,521,140 km (0.092 R)
• M61: 17,985,853 km (0.117 R)
• M62: 18,270,986 km (0.104 R)
• M63: 18,493,887 km (0.095 R)
• M64: 18,621,644 km (0.078 R)
• M65: 19,039,022 km (0.12 R)
• M66: 19,394,466 km (0.063 R)
• M67: 19,686,930 km (0.078 R)
• M68: 20,639,420 km (0.081 R)
• M69: 20,771,964 km (0.089 R)
• M70: 21,876,445 km (0.104 R)
• M71: 22,248,794 km (0.033 R)
• M72: 22,589,129 km (0.106 R)

Planet 5 - Gas Giant

Semi-Major Axis: 3.05 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 920.9

Radius: 11.8

Gravity: 6.61 G

Time & Orbit

Eccentricity (e): 0.039

Orbit Range: 2.93 AU - 3.17 AU

Year: 3494 Days

Day: 13.3 Hours

Environment

Temp: -206 °C

Axial Tilt: 5.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 25,677,924 km

• M1: 149,149 km (0.079 R)
• M2: 303,235 km (0.026 R)
• M3: 630,106 km (0.103 R)
• M4: 816,505 km (0.045 R)
• M5: 935,136 km (0.094 R)
• M6: 1,355,955 km (0.071 R)
• M7: 1,543,252 km (0.103 R)
• M8: 2,090,181 km (0.104 R)
• M9: 2,189,814 km (0.074 R)
• M10: 2,291,091 km (0.118 R)
• M11: 2,569,194 km (0.086 R)
• M12: 3,044,317 km (0.096 R)
• M13: 3,606,655 km (0.089 R)
• M14: 3,992,767 km (0.045 R)
• M15: 4,222,549 km (0.117 R)
• M16: 4,499,605 km (0.048 R)
• M17: 4,651,297 km (0.11 R)
• M18: 4,804,784 km (0.115 R)
• M19: 5,620,392 km (0.115 R)
• M20: 5,760,565 km (0.089 R)
• M21: 5,996,631 km (0.106 R)
• M22: 6,116,010 km (0.118 R)
• M23: 6,308,542 km (0.049 R)
• M24: 6,429,866 km (0.078 R)
• M25: 6,773,941 km (0.105 R)
• M26: 6,848,441 km (0.089 R)
• M27: 7,023,321 km (0.111 R)
• M28: 7,149,282 km (0.102 R)
• M29: 7,428,731 km (0.066 R)
• M30: 7,867,950 km (0.044 R)
• M31: 8,315,697 km (0.082 R)
• M32: 8,582,879 km (0.071 R)
• M33: 8,852,903 km (0.074 R)
• M34: 8,961,810 km (0.09 R)
• M35: 9,208,347 km (0.041 R)
• M36: 9,736,129 km (0.058 R)
• M37: 9,848,477 km (0.082 R)
• M38: 10,647,180 km (0.099 R)
• M39: 10,791,990 km (0.079 R)
• M40: 11,054,385 km (0.043 R)
• M41: 11,230,462 km (0.078 R)
• M42: 11,526,067 km (0.071 R)
• M43: 11,974,113 km (0.046 R)
• M44: 12,733,771 km (0.117 R)
• M45: 13,197,075 km (0.115 R)
• M46: 13,290,424 km (0.091 R)
• M47: 13,728,896 km (0.058 R)
• M48: 14,267,747 km (0.086 R)
• M49: 14,427,518 km (0.081 R)
• M50: 14,587,887 km (0.104 R)
• M51: 16,157,767 km (0.084 R)
• M52: 16,625,709 km (0.062 R)
• M53: 17,711,939 km (0.117 R)
• M54: 18,402,483 km (0.095 R)
• M55: 18,611,471 km (0.104 R)
• M56: 19,066,847 km (0.069 R)
• M57: 19,845,654 km (0.073 R)
• M58: 19,952,766 km (0.057 R)
• M59: 20,203,192 km (0.094 R)
• M60: 20,382,710 km (0.058 R)
• M61: 20,562,826 km (0.119 R)
• M62: 20,997,258 km (0.113 R)
• M63: 21,691,242 km (0.099 R)
• M64: 23,101,651 km (0.117 R)
• M65: 23,176,749 km (0.045 R)
• M66: 23,969,768 km (0.107 R)
• M67: 24,274,199 km (0.093 R)
• M68: 24,465,086 km (0.094 R)
• M69: 25,195,273 km (0.092 R)
• M70: 25,466,046 km (0.106 R)
• M71: 26,010,432 km (0.073 R)
• M72: 26,205,807 km (0.11 R)

Planet 6 - Gas Giant

Semi-Major Axis: 3.18 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 299.6

Radius: 11.5

Gravity: 2.27 G

Time & Orbit

Eccentricity (e): 0.049

Orbit Range: 3.02 AU - 3.34 AU

Year: 3720 Days

Day: 5.5 Hours

Environment

Temp: -210 °C

Axial Tilt: 20.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (64)

Outer Limit: 25,677,924 km

• M1: 180,864 km (0.072 R)
• M2: 526,585 km (0.074 R)
• M3: 605,871 km (0.073 R)
• M4: 689,945 km (0.109 R)
• M5: 787,633 km (0.08 R)
• M6: 1,228,049 km (0.103 R)
• M7: 1,316,012 km (0.119 R)
• M8: 1,801,009 km (0.101 R)
• M9: 2,123,093 km (0.045 R)
• M10: 2,257,133 km (0.064 R)
• M11: 2,366,489 km (0.093 R)
• M12: 2,533,889 km (0.077 R)
• M13: 2,777,883 km (0.105 R)
• M14: 2,880,657 km (0.114 R)
• M15: 3,014,696 km (0.115 R)
• M16: 3,351,142 km (0.116 R)
• M17: 3,699,705 km (0.108 R)
• M18: 3,796,794 km (0.09 R)
• M19: 3,878,474 km (0.062 R)
• M20: 4,010,270 km (0.059 R)
• M21: 4,656,982 km (0.082 R)
• M22: 4,797,305 km (0.04 R)
• M23: 4,956,776 km (0.089 R)
• M24: 5,046,235 km (0.086 R)
• M25: 5,154,245 km (0.109 R)
• M26: 5,575,513 km (0.1 R)
• M27: 6,392,915 km (0.096 R)
• M28: 7,126,244 km (0.096 R)
• M29: 7,451,620 km (0.107 R)
• M30: 7,698,905 km (0.1 R)
• M31: 7,781,932 km (0.117 R)
• M32: 7,990,770 km (0.095 R)
• M33: 8,478,310 km (0.04 R)
• M34: 8,564,179 km (0.066 R)
• M35: 8,758,207 km (0.1 R)
• M36: 9,349,269 km (0.077 R)
• M37: 9,482,261 km (0.044 R)
• M38: 9,616,002 km (0.08 R)
• M39: 9,953,195 km (0.113 R)
• M40: 10,362,794 km (0.112 R)
• M41: 10,523,612 km (0.096 R)
• M42: 10,662,139 km (0.117 R)
• M43: 10,847,790 km (0.077 R)
• M44: 11,340,267 km (0.061 R)
• M45: 11,506,021 km (0.101 R)
• M46: 11,720,245 km (0.089 R)
• M47: 12,032,157 km (0.074 R)
• M48: 12,225,587 km (0.118 R)
• M49: 12,371,146 km (0.092 R)
• M50: 13,207,547 km (0.1 R)
• M51: 13,332,013 km (0.119 R)
• M52: 13,482,059 km (0.067 R)
• M53: 13,758,516 km (0.061 R)
• M54: 14,062,200 km (0.076 R)
• M55: 14,189,358 km (0.117 R)
• M56: 14,779,372 km (0.113 R)
• M57: 15,246,716 km (0.11 R)
• M58: 15,325,105 km (0.054 R)
• M59: 16,063,071 km (0.036 R)
• M60: 16,302,727 km (0.049 R)
• M61: 16,677,919 km (0.112 R)
• M62: 17,110,107 km (0.083 R)
• M63: 17,847,924 km (0.12 R)
• M64: 18,123,932 km (0.066 R)

Planet 7 - Gas Giant

Semi-Major Axis: 3.87 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 422.2

Radius: 9.3

Gravity: 4.88 G

Time & Orbit

Eccentricity (e): 0.052

Orbit Range: 3.67 AU - 4.07 AU

Year: 4994 Days

Day: 5.1 Hours

Environment

Temp: -204 °C

Axial Tilt: 24 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 25,677,924 km

• M1: 145,110 km (0.044 R)
• M2: 216,767 km (0.06 R)
• M3: 343,626 km (0.112 R)
• M4: 500,704 km (0.105 R)
• M5: 704,905 km (0.114 R)
• M6: 828,922 km (0.109 R)
• M7: 972,985 km (0.106 R)
• M8: 1,259,016 km (0.118 R)
• M9: 1,469,051 km (0.073 R)
• M10: 1,541,756 km (0.11 R)
• M11: 1,600,697 km (0.085 R)
• M12: 2,019,122 km (0.066 R)
• M13: 2,116,810 km (0.11 R)
• M14: 2,401,943 km (0.104 R)
• M15: 2,505,615 km (0.067 R)
• M16: 2,575,627 km (0.089 R)
• M17: 2,862,106 km (0.077 R)
• M18: 2,990,611 km (0.094 R)
• M19: 3,387,943 km (0.056 R)
• M20: 3,504,629 km (0.116 R)
• M21: 3,682,052 km (0.087 R)
• M22: 4,169,741 km (0.08 R)
• M23: 4,253,067 km (0.099 R)
• M24: 4,315,899 km (0.118 R)
• M25: 4,379,178 km (0.112 R)
• M26: 4,613,449 km (0.066 R)
• M27: 4,678,075 km (0.09 R)
• M28: 4,917,581 km (0.107 R)
• M29: 5,385,972 km (0.083 R)
• M30: 5,454,039 km (0.118 R)
• M31: 5,683,223 km (0.063 R)
• M32: 5,868,724 km (0.091 R)
• M33: 6,079,957 km (0.078 R)
• M34: 6,150,866 km (0.119 R)
• M35: 6,293,582 km (0.073 R)
• M36: 6,606,691 km (0.111 R)
• M37: 6,728,463 km (0.104 R)
• M38: 7,755,154 km (0.104 R)
• M39: 7,909,389 km (0.114 R)
• M40: 8,064,821 km (0.057 R)
• M41: 8,168,941 km (0.118 R)
• M42: 8,299,690 km (0.059 R)
• M43: 8,883,570 km (0.114 R)
• M44: 8,964,204 km (0.058 R)
• M45: 9,618,096 km (0.104 R)
• M46: 10,118,650 km (0.082 R)
• M47: 10,259,272 km (0.103 R)
• M48: 10,599,159 km (0.101 R)
• M49: 13,915,295 km (0.117 R)
• M50: 15,247,165 km (0.057 R)
• M51: 16,223,291 km (0.091 R)
• M52: 16,553,154 km (0.05 R)
• M53: 16,619,276 km (0.113 R)
• M54: 17,219,463 km (0.067 R)
• M55: 17,724,954 km (0.096 R)
• M56: 18,647,075 km (0.095 R)
• M57: 18,785,005 km (0.084 R)
• M58: 19,027,353 km (0.092 R)
• M59: 19,270,599 km (0.115 R)
• M60: 19,479,887 km (0.117 R)
• M61: 19,654,916 km (0.096 R)
• M62: 19,936,011 km (0.118 R)
• M63: 20,395,725 km (0.115 R)
• M64: 20,644,805 km (0.063 R)
• M65: 20,716,014 km (0.098 R)
• M66: 20,930,537 km (0.096 R)
• M67: 21,325,625 km (0.111 R)
• M68: 21,832,014 km (0.095 R)
• M69: 21,977,423 km (0.11 R)
• M70: 22,452,396 km (0.068 R)
• M71: 22,635,803 km (0.065 R)
• M72: 23,004,413 km (0.073 R)
• M73: 23,115,414 km (0.09 R)
• M74: 23,374,966 km (0.114 R)
• M75: 23,635,566 km (0.075 R)
• M76: 23,747,615 km (0.098 R)
• M77: 23,859,664 km (0.104 R)
• M78: 24,310,103 km (0.049 R)
• M79: 24,423,049 km (0.108 R)
• M80: 24,611,842 km (0.041 R)
• M81: 24,876,929 km (0.04 R)
• M82: 25,066,918 km (0.088 R)
• M83: 25,219,209 km (0.108 R)
• M84: 25,524,688 km (0.116 R)

Kuiper Belt

Range: 30 - 48 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 389 - 16,110 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit