🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.58 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.16 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 679.4

Radius: 10.8

Gravity: 5.82 G

Time & Orbit

Eccentricity (e): 0.14

Orbit Range: 1 AU - 1.32 AU

Year: 878 Days

Day: 10.7 Hours

Environment

Temp: -184 °C

Axial Tilt: 2.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (59)

Outer Limit: 43,384,256 km

• M1: 134,638 km (0.111 R)
• M2: 281,543 km (0.08 R)
• M3: 356,941 km (0.115 R)
• M4: 428,747 km (0.093 R)
• M5: 511,625 km (0.081 R)
• M6: 643,121 km (0.108 R)
• M7: 741,407 km (0.098 R)
• M8: 839,394 km (0.085 R)
• M9: 979,567 km (0.111 R)
• M10: 1,114,803 km (0.086 R)
• M11: 1,249,591 km (0.078 R)
• M12: 1,433,297 km (0.049 R)
• M13: 1,543,401 km (0.109 R)
• M14: 1,633,609 km (0.068 R)
• M15: 1,702,573 km (0.077 R)
• M16: 1,772,436 km (0.116 R)
• M17: 1,971,999 km (0.077 R)
• M18: 2,178,893 km (0.027 R)
• M19: 2,516,087 km (0.084 R)
• M20: 2,587,445 km (0.056 R)
• M21: 2,777,883 km (0.096 R)
• M22: 2,879,460 km (0.059 R)
• M23: 3,020,082 km (0.118 R)
• M24: 3,308,207 km (0.1 R)
• M25: 3,445,688 km (0.068 R)
• M26: 3,535,147 km (0.104 R)
• M27: 3,696,115 km (0.057 R)
• M28: 3,767,323 km (0.075 R)
• M29: 3,900,764 km (0.088 R)
• M30: 3,983,791 km (0.104 R)
• M31: 4,098,682 km (0.09 R)
• M32: 4,214,920 km (0.082 R)
• M33: 4,353,597 km (0.115 R)
• M34: 4,428,845 km (0.102 R)
• M35: 4,515,462 km (0.074 R)
• M36: 4,613,598 km (0.067 R)
• M37: 4,778,754 km (0.098 R)
• M38: 4,901,125 km (0.061 R)
• M39: 5,137,640 km (0.113 R)
• M40: 5,645,375 km (0.086 R)
• M41: 5,751,290 km (0.115 R)
• M42: 5,822,200 km (0.069 R)
• M43: 5,917,344 km (0.1 R)
• M44: 6,036,872 km (0.042 R)
• M45: 6,560,166 km (0.09 R)
• M46: 6,696,449 km (0.059 R)
• M47: 6,821,065 km (0.105 R)
• M48: 6,921,445 km (0.116 R)
• M49: 7,060,122 km (0.117 R)
• M50: 7,585,360 km (0.098 R)
• M51: 7,846,109 km (0.114 R)
• M52: 8,056,893 km (0.111 R)
• M53: 8,242,992 km (0.12 R)
• M54: 8,511,072 km (0.051 R)
• M55: 8,632,695 km (0.105 R)
• M56: 8,741,303 km (0.045 R)
• M57: 9,014,917 km (0.094 R)
• M58: 9,083,732 km (0.095 R)
• M59: 9,291,225 km (0.081 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.23 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 685.6

Radius: 13

Gravity: 4.06 G

Time & Orbit

Eccentricity (e): 0.005

Orbit Range: 1.22 AU - 1.24 AU

Year: 959 Days

Day: 7.2 Hours

Environment

Temp: -178 °C

Axial Tilt: 8.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (53)

Outer Limit: 43,384,256 km

• M1: 179,817 km (0.073 R)
• M2: 268,827 km (0.11 R)
• M3: 397,930 km (0.042 R)
• M4: 562,338 km (0.04 R)
• M5: 673,789 km (0.076 R)
• M6: 897,587 km (0.037 R)
• M7: 1,195,437 km (0.065 R)
• M8: 1,287,589 km (0.097 R)
• M9: 1,548,188 km (0.101 R)
• M10: 1,641,687 km (0.106 R)
• M11: 1,917,246 km (0.088 R)
• M12: 2,052,333 km (0.044 R)
• M13: 2,164,382 km (0.09 R)
• M14: 2,323,105 km (0.092 R)
• M15: 2,652,520 km (0.09 R)
• M16: 2,775,190 km (0.038 R)
• M17: 2,899,955 km (0.092 R)
• M18: 2,987,320 km (0.065 R)
• M19: 3,204,985 km (0.082 R)
• M20: 3,305,515 km (0.037 R)
• M21: 3,458,553 km (0.109 R)
• M22: 3,541,131 km (0.048 R)
• M23: 3,645,401 km (0.051 R)
• M24: 3,740,096 km (0.095 R)
• M25: 3,931,881 km (0.111 R)
• M26: 4,061,732 km (0.095 R)
• M27: 4,392,343 km (0.07 R)
• M28: 4,515,911 km (0.057 R)
• M29: 4,963,059 km (0.119 R)
• M30: 5,162,623 km (0.118 R)
• M31: 5,281,254 km (0.074 R)
• M32: 5,606,031 km (0.104 R)
• M33: 5,838,506 km (0.093 R)
• M34: 6,036,872 km (0.069 R)
• M35: 6,250,049 km (0.089 R)
• M36: 6,402,041 km (0.046 R)
• M37: 6,852,330 km (0.085 R)
• M38: 7,101,261 km (0.08 R)
• M39: 7,393,127 km (0.101 R)
• M40: 7,580,872 km (0.059 R)
• M41: 7,716,109 km (0.104 R)
• M42: 7,838,330 km (0.054 R)
• M43: 8,153,982 km (0.118 R)
• M44: 8,670,393 km (0.097 R)
• M45: 8,755,066 km (0.068 R)
• M46: 8,882,822 km (0.118 R)
• M47: 9,011,028 km (0.095 R)
• M48: 9,211,938 km (0.092 R)
• M49: 9,341,789 km (0.099 R)
• M50: 9,428,705 km (0.067 R)
• M51: 9,691,100 km (0.113 R)
• M52: 9,808,534 km (0.091 R)
• M53: 9,970,698 km (0.103 R)

Planet 3 - Gas Giant

Semi-Major Axis: 4.06 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 261.8

Radius: 9.2

Gravity: 3.09 G

Time & Orbit

Eccentricity (e): 0.193

Orbit Range: 3.28 AU - 4.84 AU

Year: 5750 Days

Day: 6.3 Hours

Environment

Temp: -219 °C

Axial Tilt: 31.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (53)

Outer Limit: 43,384,256 km

• M1: 128,505 km (0.077 R)
• M2: 475,123 km (0.111 R)
• M3: 606,171 km (0.111 R)
• M4: 837,598 km (0.111 R)
• M5: 1,011,730 km (0.07 R)
• M6: 1,957,937 km (0.114 R)
• M7: 2,484,372 km (0.12 R)
• M8: 2,584,752 km (0.106 R)
• M9: 2,737,940 km (0.118 R)
• M10: 3,680,407 km (0.072 R)
• M11: 4,127,106 km (0.113 R)
• M12: 4,550,019 km (0.081 R)
• M13: 4,694,082 km (0.078 R)
• M14: 4,860,584 km (0.093 R)
• M15: 5,350,218 km (0.12 R)
• M16: 5,590,024 km (0.108 R)
• M17: 5,700,128 km (0.087 R)
• M18: 6,630,626 km (0.06 R)
• M19: 7,510,412 km (0.099 R)
• M20: 7,680,953 km (0.109 R)
• M21: 7,828,157 km (0.088 R)
• M22: 8,150,391 km (0.105 R)
• M23: 8,225,489 km (0.092 R)
• M24: 8,603,822 km (0.08 R)
• M25: 8,782,293 km (0.096 R)
• M26: 9,351,512 km (0.026 R)
• M27: 10,012,735 km (0.085 R)
• M28: 10,416,649 km (0.113 R)
• M29: 10,936,053 km (0.108 R)
• M30: 11,380,060 km (0.065 R)
• M31: 12,056,990 km (0.115 R)
• M32: 13,126,016 km (0.094 R)
• M33: 13,331,713 km (0.094 R)
• M34: 13,479,367 km (0.117 R)
• M35: 13,865,479 km (0.092 R)
• M36: 13,955,237 km (0.08 R)
• M37: 14,075,065 km (0.083 R)
• M38: 14,436,494 km (0.118 R)
• M39: 14,557,818 km (0.072 R)
• M40: 14,770,695 km (0.093 R)
• M41: 15,261,227 km (0.093 R)
• M42: 15,446,579 km (0.035 R)
• M43: 15,788,410 km (0.058 R)
• M44: 16,195,465 km (0.067 R)
• M45: 16,701,256 km (0.07 R)
• M46: 17,084,077 km (0.094 R)
• M47: 17,212,282 km (0.1 R)
• M48: 17,405,263 km (0.112 R)
• M49: 17,955,784 km (0.1 R)
• M50: 18,479,227 km (0.101 R)
• M51: 21,102,126 km (0.094 R)
• M52: 22,351,418 km (0.107 R)
• M53: 24,018,387 km (0.069 R)

Planet 4 - Gas Giant

Semi-Major Axis: 5.42 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 542.4

Radius: 14.8

Gravity: 2.48 G

Time & Orbit

Eccentricity (e): 0.228

Orbit Range: 4.18 AU - 6.66 AU

Year: 8870 Days

Day: 9.8 Hours

Environment

Temp: -225 °C

Axial Tilt: 0 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 43,384,256 km

• M1: 218,862 km (0.116 R)
• M2: 510,129 km (0.097 R)
• M3: 955,033 km (0.108 R)
• M4: 1,211,892 km (0.055 R)
• M5: 1,590,525 km (0.052 R)
• M6: 1,814,921 km (0.074 R)
• M7: 2,551,541 km (0.043 R)
• M8: 2,743,475 km (0.042 R)
• M9: 3,142,004 km (0.039 R)
• M10: 3,374,330 km (0.071 R)
• M11: 3,720,349 km (0.093 R)
• M12: 4,190,236 km (0.096 R)
• M13: 4,446,797 km (0.116 R)
• M14: 4,826,626 km (0.085 R)
• M15: 4,945,706 km (0.111 R)
• M16: 5,186,708 km (0.044 R)
• M17: 5,997,079 km (0.115 R)
• M18: 6,125,285 km (0.117 R)
• M19: 6,449,912 km (0.104 R)
• M20: 6,813,585 km (0.103 R)
• M21: 7,665,096 km (0.054 R)
• M22: 7,944,694 km (0.064 R)
• M23: 8,085,765 km (0.059 R)
• M24: 9,060,096 km (0.119 R)
• M25: 9,318,751 km (0.107 R)
• M26: 10,033,380 km (0.092 R)
• M27: 10,262,713 km (0.077 R)
• M28: 10,804,557 km (0.118 R)
• M29: 11,118,563 km (0.119 R)
• M30: 11,997,300 km (0.047 R)
• M31: 12,118,924 km (0.104 R)
• M32: 12,240,846 km (0.05 R)
• M33: 12,445,047 km (0.084 R)
• M34: 12,609,305 km (0.075 R)
• M35: 13,273,370 km (0.061 R)
• M36: 13,525,293 km (0.113 R)
• M37: 14,119,496 km (0.045 R)
• M38: 14,290,785 km (0.074 R)
• M39: 14,722,226 km (0.09 R)
• M40: 15,819,376 km (0.113 R)
• M41: 15,952,818 km (0.036 R)
• M42: 16,176,167 km (0.075 R)
• M43: 16,852,051 km (0.077 R)
• M44: 17,033,962 km (0.086 R)
• M45: 17,537,358 km (0.111 R)
• M46: 17,721,663 km (0.105 R)
• M47: 18,605,786 km (0.116 R)
• M48: 18,793,831 km (0.053 R)
• M49: 18,982,324 km (0.107 R)
• M50: 19,313,983 km (0.097 R)
• M51: 19,838,922 km (0.067 R)
• M52: 20,513,907 km (0.107 R)
• M53: 20,610,847 km (0.055 R)
• M54: 20,756,705 km (0.09 R)
• M55: 20,951,780 km (0.082 R)
• M56: 21,147,454 km (0.117 R)
• M57: 21,294,509 km (0.108 R)
• M58: 21,540,448 km (0.05 R)
• M59: 22,433,697 km (0.093 R)
• M60: 23,086,243 km (0.066 R)
• M61: 23,643,495 km (0.114 R)
• M62: 23,949,273 km (0.066 R)
• M63: 24,564,718 km (0.091 R)
• M64: 25,602,030 km (0.104 R)
• M65: 27,344,995 km (0.094 R)
• M66: 28,095,976 km (0.094 R)
• M67: 28,365,851 km (0.09 R)
• M68: 29,016,901 km (0.095 R)
• M69: 29,892,796 km (0.046 R)
• M70: 30,223,557 km (0.081 R)
• M71: 30,610,866 km (0.065 R)
• M72: 31,558,568 km (0.073 R)
• M73: 32,742,336 km (0.111 R)
• M74: 32,855,881 km (0.102 R)
• M75: 34,170,697 km (0.081 R)
• M76: 36,262,973 km (0.07 R)
• M77: 36,556,932 km (0.097 R)
• M78: 38,217,170 km (0.071 R)
• M79: 38,576,205 km (0.106 R)
• M80: 38,936,287 km (0.107 R)
• M81: 39,056,563 km (0.061 R)
• M82: 39,780,916 km (0.09 R)
• M83: 39,902,090 km (0.045 R)
• M84: 40,084,001 km (0.113 R)

Planet 5 - Ice Giant

Semi-Major Axis: 7.29 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 450.2

Radius: 4.9

Gravity: 18.75 G

Time & Orbit

Eccentricity (e): 0.042

Orbit Range: 6.98 AU - 7.6 AU

Year: 13836 Days

Day: 17 Hours

Environment

Temp: -227 °C

Axial Tilt: 7.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 43,384,256 km

• M1: 112,647 km (0.112 R)
• M2: 277,654 km (0.116 R)
• M3: 343,028 km (0.12 R)
• M4: 413,937 km (0.111 R)
• M5: 458,966 km (0.091 R)
• M6: 1,080,396 km (0.08 R)
• M7: 1,296,864 km (0.04 R)
• M8: 1,646,624 km (0.056 R)
• M9: 1,794,426 km (0.045 R)
• M10: 1,895,405 km (0.11 R)
• M11: 1,998,179 km (0.12 R)
• M12: 2,427,824 km (0.112 R)
• M13: 2,539,573 km (0.036 R)
• M14: 3,276,193 km (0.071 R)
• M15: 3,844,665 km (0.039 R)
• M16: 4,073,849 km (0.042 R)
• M17: 4,140,271 km (0.088 R)
• M18: 4,718,466 km (0.074 R)
• M19: 4,823,035 km (0.081 R)
• M20: 5,034,716 km (0.061 R)
• M21: 5,070,321 km (0.087 R)
• M22: 5,321,645 km (0.082 R)
• M23: 5,613,810 km (0.059 R)
• M24: 6,290,291 km (0.075 R)
• M25: 6,367,035 km (0.103 R)
• M26: 6,560,315 km (0.076 R)
• M27: 7,231,711 km (0.048 R)
• M28: 7,842,070 km (0.083 R)
• M29: 9,024,940 km (0.062 R)
• M30: 10,398,099 km (0.119 R)
• M31: 10,717,042 km (0.1 R)
• M32: 11,131,877 km (0.106 R)
• M33: 11,882,260 km (0.071 R)
• M34: 12,263,585 km (0.057 R)
• M35: 13,087,121 km (0.113 R)
• M36: 13,629,563 km (0.093 R)
• M37: 13,679,229 km (0.114 R)
• M38: 14,583,548 km (0.115 R)
• M39: 15,248,661 km (0.11 R)
• M40: 15,923,646 km (0.107 R)
• M41: 16,555,248 km (0.114 R)
• M42: 16,714,420 km (0.072 R)
• M43: 17,195,078 km (0.086 R)
• M44: 17,356,345 km (0.058 R)
• M45: 17,951,744 km (0.118 R)
• M46: 18,006,198 km (0.035 R)
• M47: 18,663,980 km (0.1 R)
• M48: 19,385,490 km (0.101 R)
• M49: 20,003,180 km (0.109 R)
• M50: 20,059,578 km (0.094 R)
• M51: 21,027,626 km (0.057 R)
• M52: 21,662,071 km (0.057 R)
• M53: 21,952,590 km (0.083 R)
• M54: 22,420,083 km (0.063 R)
• M55: 22,537,368 km (0.109 R)
• M56: 22,831,777 km (0.08 R)
• M57: 24,081,667 km (0.114 R)
• M58: 24,563,671 km (0.116 R)
• M59: 25,476,069 km (0.083 R)
• M60: 25,721,259 km (0.056 R)
• M61: 26,028,683 km (0.107 R)
• M62: 26,709,653 km (0.12 R)
• M63: 26,896,351 km (0.114 R)
• M64: 28,914,875 km (0.029 R)
• M65: 30,460,370 km (0.051 R)
• M66: 30,850,970 km (0.089 R)
• M67: 31,505,611 km (0.117 R)
• M68: 32,098,617 km (0.097 R)
• M69: 32,496,098 km (0.103 R)
• M70: 32,961,796 km (0.096 R)
• M71: 33,162,108 km (0.099 R)
• M72: 33,228,978 km (0.103 R)
• M73: 35,459,931 km (0.029 R)
• M74: 36,420,948 km (0.052 R)
• M75: 36,766,220 km (0.108 R)
• M76: 38,509,035 km (0.09 R)
• M77: 39,284,251 km (0.091 R)
• M78: 40,135,912 km (0.115 R)
• M79: 40,207,121 km (0.119 R)
• M80: 41,568,760 km (0.101 R)
• M81: 42,001,996 km (0.105 R)
• M82: 42,799,801 km (0.114 R)
• M83: 43,456,386 km (0.049 R)
• M84: 44,042,810 km (0.043 R)
• M85: 44,116,412 km (0.106 R)
• M86: 44,558,175 km (0.104 R)
• M87: 45,520,388 km (0.097 R)
• M88: 45,892,288 km (0.082 R)
• M89: 46,863,927 km (0.027 R)
• M90: 48,751,552 km (0.114 R)
• M91: 50,125,908 km (0.087 R)
• M92: 50,663,862 km (0.107 R)

Planet 6 - Ice Giant

Semi-Major Axis: 7.45 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 248.6

Radius: 4.4

Gravity: 12.84 G

Time & Orbit

Eccentricity (e): 0.078

Orbit Range: 6.87 AU - 8.03 AU

Year: 14294 Days

Day: 17.9 Hours

Environment

Temp: -235 °C

Axial Tilt: 12.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 43,384,256 km

• M1: 196,123 km (0.118 R)
• M2: 388,506 km (0.099 R)
• M3: 427,700 km (0.084 R)
• M4: 468,391 km (0.048 R)
• M5: 539,151 km (0.099 R)
• M6: 874,400 km (0.05 R)
• M7: 1,035,217 km (0.079 R)
• M8: 1,072,168 km (0.071 R)
• M9: 1,722,470 km (0.113 R)
• M10: 1,923,829 km (0.112 R)
• M11: 2,015,831 km (0.1 R)
• M12: 2,109,180 km (0.107 R)
• M13: 2,673,314 km (0.091 R)
• M14: 2,724,476 km (0.041 R)
• M15: 3,226,826 km (0.075 R)
• M16: 3,502,535 km (0.063 R)
• M17: 3,700,004 km (0.097 R)
• M18: 3,959,407 km (0.119 R)
• M19: 4,194,724 km (0.106 R)
• M20: 4,374,242 km (0.097 R)
• M21: 4,495,416 km (0.086 R)
• M22: 4,927,903 km (0.087 R)
• M23: 5,181,023 km (0.075 R)
• M24: 5,536,019 km (0.106 R)
• M25: 6,066,194 km (0.057 R)
• M26: 6,100,003 km (0.113 R)
• M27: 6,474,446 km (0.086 R)
• M28: 7,138,960 km (0.051 R)
• M29: 7,353,184 km (0.117 R)
• M30: 8,194,223 km (0.091 R)
• M31: 8,231,473 km (0.052 R)
• M32: 9,531,180 km (0.083 R)
• M33: 9,885,726 km (0.048 R)
• M34: 10,526,753 km (0.047 R)
• M35: 10,607,835 km (0.074 R)
• M36: 10,975,248 km (0.078 R)
• M37: 11,263,822 km (0.119 R)
• M38: 11,680,602 km (0.069 R)
• M39: 12,187,140 km (0.073 R)
• M40: 12,960,561 km (0.074 R)
• M41: 13,047,477 km (0.092 R)
• M42: 13,661,278 km (0.082 R)
• M43: 13,705,409 km (0.085 R)
• M44: 13,793,971 km (0.11 R)
• M45: 14,464,169 km (0.105 R)
• M46: 14,644,584 km (0.116 R)
• M47: 15,190,617 km (0.114 R)
• M48: 16,115,131 km (0.112 R)
• M49: 16,396,076 km (0.1 R)
• M50: 17,344,228 km (0.041 R)
• M51: 17,439,970 km (0.084 R)
• M52: 18,261,262 km (0.11 R)
• M53: 18,407,569 km (0.119 R)
• M54: 18,456,338 km (0.116 R)
• M55: 18,750,298 km (0.067 R)
• M56: 19,095,121 km (0.084 R)
• M57: 19,541,521 km (0.042 R)
• M58: 19,741,085 km (0.096 R)
• M59: 20,192,421 km (0.118 R)
• M60: 20,495,357 km (0.093 R)
• M61: 21,773,072 km (0.076 R)
• M62: 22,083,638 km (0.093 R)
• M63: 22,866,334 km (0.057 R)
• M64: 23,023,860 km (0.119 R)
• M65: 23,764,220 km (0.064 R)
• M66: 24,727,630 km (0.045 R)
• M67: 25,213,973 km (0.108 R)
• M68: 25,431,189 km (0.115 R)
• M69: 26,692,150 km (0.077 R)
• M70: 26,747,351 km (0.091 R)
• M71: 27,358,010 km (0.08 R)
• M72: 27,525,410 km (0.059 R)
• M73: 27,917,057 km (0.117 R)
• M74: 28,254,400 km (0.061 R)
• M75: 29,674,084 km (0.055 R)
• M76: 29,788,676 km (0.049 R)
• M77: 31,583,402 km (0.071 R)
• M78: 31,759,030 km (0.092 R)
• M79: 32,405,442 km (0.112 R)
• M80: 32,523,475 km (0.112 R)
• M81: 34,130,305 km (0.112 R)
• M82: 34,190,294 km (0.102 R)
• M83: 34,792,426 km (0.116 R)
• M84: 35,762,867 km (0.085 R)
• M85: 37,358,777 km (0.08 R)
• M86: 38,041,093 km (0.106 R)
• M87: 38,977,875 km (0.119 R)
• M88: 39,103,387 km (0.088 R)
• M89: 39,229,050 km (0.035 R)
• M90: 39,859,156 km (0.07 R)
• M91: 40,048,846 km (0.065 R)
• M92: 41,513,110 km (0.06 R)

Kuiper Belt

Range: 30 - 46 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 259 - 19,861 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit