🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.31 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.62 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 998.6

Radius: 10.8

Gravity: 8.56 G

Time & Orbit

Eccentricity (e): 0.161

Orbit Range: 0.52 AU - 0.72 AU

Year: 331 Days

Day: 5 Hours

Environment

Temp: -157 °C

Axial Tilt: 18.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (47)

Outer Limit: 80,832,420 km

• M1: 134,488 km (0.105 R)
• M2: 212,728 km (0.079 R)
• M3: 331,210 km (0.109 R)
• M4: 423,960 km (0.119 R)
• M5: 494,271 km (0.101 R)
• M6: 583,731 km (0.093 R)
• M7: 679,623 km (0.078 R)
• M8: 781,499 km (0.073 R)
• M9: 901,776 km (0.088 R)
• M10: 1,010,683 km (0.106 R)
• M11: 1,087,577 km (0.108 R)
• M12: 1,190,201 km (0.109 R)
• M13: 1,315,863 km (0.12 R)
• M14: 1,446,163 km (0.064 R)
• M15: 1,676,693 km (0.098 R)
• M16: 1,780,065 km (0.04 R)
• M17: 1,852,022 km (0.081 R)
• M18: 1,919,341 km (0.119 R)
• M19: 1,993,242 km (0.077 R)
• M20: 2,074,025 km (0.091 R)
• M21: 2,161,839 km (0.111 R)
• M22: 2,250,850 km (0.107 R)
• M23: 2,402,093 km (0.107 R)
• M24: 2,488,261 km (0.105 R)
• M25: 2,600,609 km (0.087 R)
• M26: 2,727,468 km (0.057 R)
• M27: 2,811,094 km (0.064 R)
• M28: 2,961,290 km (0.109 R)
• M29: 3,047,309 km (0.06 R)
• M30: 3,303,570 km (0.111 R)
• M31: 3,420,555 km (0.109 R)
• M32: 3,559,981 km (0.1 R)
• M33: 3,644,653 km (0.099 R)
• M34: 3,873,538 km (0.079 R)
• M35: 4,092,399 km (0.114 R)
• M36: 4,352,999 km (0.108 R)
• M37: 4,451,135 km (0.114 R)
• M38: 4,588,466 km (0.086 R)
• M39: 4,696,027 km (0.028 R)
• M40: 4,781,298 km (0.068 R)
• M41: 4,859,238 km (0.109 R)
• M42: 4,953,335 km (0.112 R)
• M43: 5,095,603 km (0.118 R)
• M44: 5,207,203 km (0.08 R)
• M45: 5,287,387 km (0.053 R)
• M46: 5,400,483 km (0.105 R)
• M47: 5,546,939 km (0.113 R)

Planet 2 - Gas Giant

Semi-Major Axis: 4.84 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 544.3

Radius: 10.1

Gravity: 5.34 G

Time & Orbit

Eccentricity (e): 0.193

Orbit Range: 3.91 AU - 5.77 AU

Year: 7222 Days

Day: 10.8 Hours

Environment

Temp: -213 °C

Axial Tilt: 40 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 80,832,420 km

• M1: 146,456 km (0.101 R)
• M2: 389,403 km (0.051 R)
• M3: 560,094 km (0.098 R)
• M4: 757,115 km (0.094 R)
• M5: 992,582 km (0.112 R)
• M6: 1,302,848 km (0.082 R)
• M7: 1,372,112 km (0.089 R)
• M8: 1,496,278 km (0.08 R)
• M9: 2,051,286 km (0.064 R)
• M10: 2,277,777 km (0.11 R)
• M11: 2,913,419 km (0.093 R)
• M12: 3,005,421 km (0.087 R)
• M13: 3,121,659 km (0.119 R)
• M14: 3,334,686 km (0.074 R)
• M15: 3,626,402 km (0.039 R)
• M16: 3,800,384 km (0.093 R)
• M17: 4,002,641 km (0.107 R)
• M18: 4,338,937 km (0.096 R)
• M19: 4,550,318 km (0.116 R)
• M20: 4,711,286 km (0.113 R)
• M21: 5,066,431 km (0.076 R)
• M22: 5,515,374 km (0.111 R)
• M23: 5,773,580 km (0.11 R)
• M24: 5,860,497 km (0.098 R)
• M25: 6,183,179 km (0.057 R)
• M26: 6,361,649 km (0.112 R)
• M27: 6,632,571 km (0.067 R)
• M28: 7,154,518 km (0.088 R)
• M29: 7,279,432 km (0.098 R)
• M30: 7,562,771 km (0.06 R)
• M31: 7,914,027 km (0.11 R)
• M32: 8,632,695 km (0.1 R)
• M33: 9,304,240 km (0.027 R)
• M34: 9,406,415 km (0.031 R)
• M35: 9,680,628 km (0.077 R)
• M36: 9,888,120 km (0.106 R)
• M37: 10,202,126 km (0.091 R)
• M38: 10,696,996 km (0.042 R)
• M39: 10,911,519 km (0.087 R)
• M40: 11,199,794 km (0.118 R)
• M41: 11,381,256 km (0.073 R)
• M42: 11,636,919 km (0.104 R)
• M43: 11,783,824 km (0.103 R)
• M44: 12,191,179 km (0.047 R)
• M45: 12,377,877 km (0.099 R)
• M46: 12,791,815 km (0.115 R)
• M47: 13,210,539 km (0.09 R)
• M48: 14,061,153 km (0.112 R)
• M49: 14,139,392 km (0.108 R)
• M50: 15,089,189 km (0.106 R)
• M51: 15,410,525 km (0.071 R)
• M52: 15,652,874 km (0.107 R)
• M53: 16,223,440 km (0.098 R)
• M54: 17,637,140 km (0.099 R)
• M55: 18,960,333 km (0.067 R)
• M56: 19,090,035 km (0.092 R)
• M57: 19,176,801 km (0.099 R)
• M58: 19,568,299 km (0.09 R)
• M59: 20,271,110 km (0.112 R)
• M60: 20,359,522 km (0.041 R)
• M61: 20,448,084 km (0.066 R)
• M62: 21,205,947 km (0.077 R)
• M63: 21,701,266 km (0.058 R)
• M64: 22,291,429 km (0.063 R)
• M65: 23,071,283 km (0.097 R)
• M66: 24,422,152 km (0.051 R)
• M67: 24,657,768 km (0.081 R)
• M68: 24,893,983 km (0.091 R)
• M69: 25,321,085 km (0.12 R)
• M70: 26,086,577 km (0.054 R)
• M71: 26,279,110 km (0.042 R)
• M72: 26,713,991 km (0.103 R)
• M73: 26,811,080 km (0.06 R)
• M74: 27,591,083 km (0.061 R)
• M75: 28,428,083 km (0.037 R)
• M76: 29,573,704 km (0.12 R)
• M77: 30,632,857 km (0.102 R)
• M78: 31,243,665 km (0.095 R)
• M79: 31,653,114 km (0.101 R)
• M80: 31,961,286 km (0.063 R)
• M81: 32,064,359 km (0.114 R)
• M82: 32,736,352 km (0.026 R)
• M83: 32,996,054 km (0.084 R)
• M84: 33,152,235 km (0.094 R)
• M85: 33,412,984 km (0.038 R)
• M86: 33,989,235 km (0.12 R)
• M87: 34,727,201 km (0.073 R)
• M88: 34,992,139 km (0.097 R)
• M89: 35,417,296 km (0.112 R)

Planet 3 - Gas Giant

Semi-Major Axis: 5.28 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 474.2

Radius: 11.7

Gravity: 3.46 G

Time & Orbit

Eccentricity (e): 0.123

Orbit Range: 4.63 AU - 5.93 AU

Year: 8229 Days

Day: 9.3 Hours

Environment

Temp: -218 °C

Axial Tilt: 33.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 80,832,420 km

• M1: 213,626 km (0.111 R)
• M2: 409,449 km (0.101 R)
• M3: 547,827 km (0.116 R)
• M4: 636,988 km (0.046 R)
• M5: 953,537 km (0.111 R)
• M6: 1,064,688 km (0.095 R)
• M7: 1,146,967 km (0.034 R)
• M8: 1,318,406 km (0.107 R)
• M9: 1,498,671 km (0.059 R)
• M10: 1,726,060 km (0.108 R)
• M11: 1,884,036 km (0.087 R)
• M12: 2,300,217 km (0.116 R)
• M13: 2,791,197 km (0.092 R)
• M14: 2,977,895 km (0.072 R)
• M15: 3,537,840 km (0.107 R)
• M16: 3,613,237 km (0.09 R)
• M17: 3,972,721 km (0.087 R)
• M18: 4,103,918 km (0.082 R)
• M19: 4,397,729 km (0.107 R)
• M20: 4,643,368 km (0.094 R)
• M21: 4,781,746 km (0.099 R)
• M22: 4,893,346 km (0.077 R)
• M23: 5,320,149 km (0.11 R)
• M24: 5,465,109 km (0.077 R)
• M25: 5,729,299 km (0.049 R)
• M26: 6,331,580 km (0.09 R)
• M27: 6,733,999 km (0.055 R)
• M28: 6,890,927 km (0.091 R)
• M29: 7,208,523 km (0.1 R)
• M30: 7,304,864 km (0.101 R)
• M31: 7,531,056 km (0.099 R)
• M32: 7,759,642 km (0.1 R)
• M33: 7,924,349 km (0.092 R)
• M34: 8,090,103 km (0.116 R)
• M35: 8,936,678 km (0.072 R)
• M36: 9,318,152 km (0.076 R)
• M37: 9,740,467 km (0.073 R)
• M38: 10,168,915 km (0.088 R)
• M39: 10,421,736 km (0.063 R)
• M40: 10,530,793 km (0.107 R)
• M41: 10,676,650 km (0.095 R)
• M42: 10,970,610 km (0.053 R)
• M43: 11,044,512 km (0.052 R)
• M44: 11,416,412 km (0.11 R)
• M45: 11,491,360 km (0.119 R)
• M46: 12,556,946 km (0.075 R)
• M47: 13,733,533 km (0.117 R)
• M48: 14,700,085 km (0.073 R)
• M49: 14,904,137 km (0.087 R)
• M50: 15,315,232 km (0.107 R)
• M51: 15,688,478 km (0.105 R)
• M52: 17,168,151 km (0.114 R)
• M53: 17,728,993 km (0.097 R)
• M54: 18,033,575 km (0.118 R)
• M55: 18,515,728 km (0.107 R)
• M56: 18,824,648 km (0.066 R)
• M57: 19,761,879 km (0.116 R)
• M58: 20,349,649 km (0.103 R)
• M59: 20,622,814 km (0.109 R)
• M60: 22,994,090 km (0.092 R)
• M61: 23,278,775 km (0.046 R)
• M62: 24,428,883 km (0.116 R)
• M63: 25,548,324 km (0.11 R)
• M64: 28,597,877 km (0.044 R)
• M65: 29,057,442 km (0.03 R)
• M66: 29,725,546 km (0.109 R)
• M67: 30,450,796 km (0.063 R)
• M68: 31,813,034 km (0.083 R)
• M69: 31,918,800 km (0.035 R)
• M70: 33,088,207 km (0.099 R)
• M71: 33,195,169 km (0.093 R)
• M72: 33,302,431 km (0.076 R)
• M73: 33,570,660 km (0.106 R)
• M74: 34,271,675 km (0.04 R)
• M75: 34,814,267 km (0.046 R)
• M76: 35,195,741 km (0.079 R)
• M77: 36,072,834 km (0.096 R)
• M78: 36,403,595 km (0.119 R)
• M79: 37,123,759 km (0.037 R)

Planet 4 - Gas Giant

Semi-Major Axis: 5.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 685

Radius: 13.1

Gravity: 3.99 G

Time & Orbit

Eccentricity (e): 0.001

Orbit Range: 5.55 AU - 5.57 AU

Year: 8892 Days

Day: 11.5 Hours

Environment

Temp: -222 °C

Axial Tilt: 2.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 80,832,420 km

• M1: 178,470 km (0.115 R)
• M2: 427,700 km (0.068 R)
• M3: 543,040 km (0.118 R)
• M4: 671,545 km (0.102 R)
• M5: 795,711 km (0.115 R)
• M6: 1,033,871 km (0.099 R)
• M7: 2,091,229 km (0.116 R)
• M8: 2,451,460 km (0.089 R)
• M9: 2,651,772 km (0.117 R)
• M10: 2,779,977 km (0.107 R)
• M11: 3,395,872 km (0.094 R)
• M12: 4,412,688 km (0.058 R)
• M13: 4,719,813 km (0.093 R)
• M14: 4,875,993 km (0.09 R)
• M15: 5,551,128 km (0.11 R)
• M16: 6,017,574 km (0.051 R)
• M17: 6,153,110 km (0.119 R)
• M18: 6,601,006 km (0.107 R)
• M19: 6,811,341 km (0.039 R)
• M20: 7,202,689 km (0.044 R)
• M21: 7,785,073 km (0.118 R)
• M22: 8,995,320 km (0.084 R)
• M23: 9,150,603 km (0.082 R)
• M24: 9,346,127 km (0.104 R)
• M25: 10,222,920 km (0.088 R)
• M26: 11,084,305 km (0.079 R)
• M27: 11,209,368 km (0.105 R)
• M28: 11,292,994 km (0.112 R)
• M29: 11,629,290 km (0.097 R)
• M30: 12,398,372 km (0.119 R)
• M31: 13,582,589 km (0.099 R)
• M32: 13,761,209 km (0.035 R)
• M33: 14,075,514 km (0.105 R)
• M34: 14,210,900 km (0.084 R)
• M35: 15,729,319 km (0.103 R)
• M36: 15,822,967 km (0.105 R)
• M37: 16,010,862 km (0.09 R)
• M38: 16,769,921 km (0.105 R)
• M39: 17,930,651 km (0.116 R)
• M40: 18,323,196 km (0.078 R)
• M41: 18,669,216 km (0.112 R)
• M42: 18,768,399 km (0.079 R)
• M43: 19,669,427 km (0.063 R)
• M44: 20,328,855 km (0.112 R)
• M45: 21,202,207 km (0.044 R)
• M46: 21,930,599 km (0.075 R)
• M47: 22,192,844 km (0.038 R)
• M48: 22,667,369 km (0.112 R)
• M49: 23,305,254 km (0.073 R)
• M50: 23,412,067 km (0.115 R)
• M51: 23,572,735 km (0.093 R)
• M52: 24,056,834 km (0.115 R)
• M53: 24,218,998 km (0.088 R)
• M54: 24,980,301 km (0.045 R)
• M55: 26,026,140 km (0.114 R)
• M56: 27,030,091 km (0.078 R)
• M57: 27,933,214 km (0.081 R)
• M58: 28,160,602 km (0.07 R)
• M59: 28,502,733 km (0.043 R)
• M60: 28,846,209 km (0.085 R)
• M61: 29,537,352 km (0.09 R)
• M62: 30,175,686 km (0.114 R)
• M63: 30,292,222 km (0.102 R)
• M64: 30,935,942 km (0.086 R)
• M65: 31,288,993 km (0.059 R)
• M66: 32,535,143 km (0.027 R)
• M67: 33,435,124 km (0.08 R)
• M68: 33,858,037 km (0.072 R)
• M69: 33,979,062 km (0.089 R)
• M70: 35,075,764 km (0.118 R)
• M71: 35,443,924 km (0.113 R)
• M72: 36,867,049 km (0.12 R)
• M73: 37,054,046 km (0.066 R)
• M74: 38,182,613 km (0.114 R)
• M75: 39,322,548 km (0.102 R)
• M76: 40,152,816 km (0.036 R)
• M77: 40,281,022 km (0.104 R)
• M78: 41,053,396 km (0.108 R)
• M79: 41,506,079 km (0.103 R)
• M80: 41,765,631 km (0.064 R)
• M81: 41,895,632 km (0.112 R)
• M82: 42,286,232 km (0.113 R)
• M83: 43,268,043 km (0.072 R)

Planet 5 - Ice Giant

Semi-Major Axis: 7 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 18.5

Radius: 3.7

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.09

Orbit Range: 6.37 AU - 7.63 AU

Year: 12561 Days

Day: 22 Hours

Environment

Temp: -237 °C

Axial Tilt: 42.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (38)

Outer Limit: 80,832,420 km

• M1: 169,644 km (0.107 R)
• M2: 911,201 km (0.116 R)
• M3: 1,055,114 km (0.098 R)
• M4: 1,439,730 km (0.09 R)
• M5: 1,539,362 km (0.067 R)
• M6: 1,573,171 km (0.12 R)
• M7: 1,710,502 km (0.116 R)
• M8: 1,960,181 km (0.073 R)
• M9: 3,040,128 km (0.085 R)
• M10: 3,637,472 km (0.045 R)
• M11: 4,269,972 km (0.055 R)
• M12: 4,737,465 km (0.101 R)
• M13: 4,852,805 km (0.062 R)
• M14: 5,598,551 km (0.084 R)
• M15: 5,825,640 km (0.105 R)
• M16: 6,198,737 km (0.107 R)
• M17: 7,080,467 km (0.092 R)
• M18: 7,631,885 km (0.076 R)
• M19: 8,276,053 km (0.052 R)
• M20: 9,161,673 km (0.086 R)
• M21: 9,408,360 km (0.118 R)
• M22: 9,845,485 km (0.079 R)
• M23: 10,225,314 km (0.101 R)
• M24: 10,502,668 km (0.114 R)
• M25: 11,503,627 km (0.106 R)
• M26: 11,703,041 km (0.093 R)
• M27: 12,082,721 km (0.041 R)
• M28: 12,625,761 km (0.112 R)
• M29: 12,808,420 km (0.046 R)
• M30: 13,176,580 km (0.072 R)
• M31: 13,641,680 km (0.093 R)
• M32: 13,946,860 km (0.085 R)
• M33: 14,017,470 km (0.103 R)
• M34: 14,183,075 km (0.051 R)
• M35: 15,359,812 km (0.074 R)
• M36: 15,873,680 km (0.118 R)
• M37: 15,947,432 km (0.104 R)
• M38: 16,567,515 km (0.088 R)

Planet 6 - Ice Giant

Semi-Major Axis: 10.16 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 680.9

Radius: 5.6

Gravity: 21.71 G

Time & Orbit

Eccentricity (e): 0.139

Orbit Range: 8.75 AU - 11.57 AU

Year: 21965 Days

Day: 23.7 Hours

Environment

Temp: -227 °C

Axial Tilt: 28.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (97)

Outer Limit: 80,832,420 km

• M1: 138,528 km (0.107 R)
• M2: 408,253 km (0.082 R)
• M3: 448,046 km (0.057 R)
• M4: 789,727 km (0.038 R)
• M5: 840,590 km (0.045 R)
• M6: 945,608 km (0.073 R)
• M7: 1,346,680 km (0.059 R)
• M8: 1,728,454 km (0.062 R)
• M9: 2,142,092 km (0.109 R)
• M10: 2,286,753 km (0.093 R)
• M11: 2,434,406 km (0.066 R)
• M12: 3,384,951 km (0.064 R)
• M13: 3,468,875 km (0.102 R)
• M14: 3,681,753 km (0.088 R)
• M15: 3,724,837 km (0.107 R)
• M16: 4,075,644 km (0.059 R)
• M17: 4,855,648 km (0.081 R)
• M18: 4,998,065 km (0.073 R)
• M19: 5,630,864 km (0.104 R)
• M20: 6,134,859 km (0.1 R)
• M21: 7,841,771 km (0.044 R)
• M22: 8,064,821 km (0.067 R)
• M23: 8,121,070 km (0.06 R)
• M24: 8,631,797 km (0.096 R)
• M25: 9,863,586 km (0.108 R)
• M26: 10,962,532 km (0.115 R)
• M27: 11,653,076 km (0.116 R)
• M28: 11,780,084 km (0.099 R)
• M29: 14,757,830 km (0.096 R)
• M30: 14,826,495 km (0.103 R)
• M31: 14,964,275 km (0.103 R)
• M32: 15,033,240 km (0.094 R)
• M33: 16,151,783 km (0.09 R)
• M34: 16,506,779 km (0.106 R)
• M35: 16,577,987 km (0.054 R)
• M36: 18,172,701 km (0.12 R)
• M37: 19,967,277 km (0.105 R)
• M38: 20,195,413 km (0.085 R)
• M39: 21,583,233 km (0.081 R)
• M40: 22,367,275 km (0.072 R)
• M41: 22,525,251 km (0.112 R)
• M42: 23,400,697 km (0.119 R)
• M43: 24,530,760 km (0.098 R)
• M44: 25,020,543 km (0.05 R)
• M45: 26,759,918 km (0.091 R)
• M46: 27,095,615 km (0.079 R)
• M47: 27,517,332 km (0.119 R)
• M48: 27,940,993 km (0.071 R)
• M49: 28,111,235 km (0.111 R)
• M50: 28,709,327 km (0.11 R)
• M51: 29,484,544 km (0.097 R)
• M52: 29,831,162 km (0.119 R)
• M53: 30,528,737 km (0.045 R)
• M54: 30,967,358 km (0.073 R)
• M55: 31,496,635 km (0.085 R)
• M56: 32,028,755 km (0.114 R)
• M57: 32,832,544 km (0.101 R)
• M58: 33,101,970 km (0.052 R)
• M59: 36,670,328 km (0.087 R)
• M60: 37,043,126 km (0.087 R)
• M61: 40,647,237 km (0.109 R)
• M62: 42,197,969 km (0.083 R)
• M63: 44,262,270 km (0.068 R)
• M64: 46,057,893 km (0.073 R)
• M65: 46,258,803 km (0.098 R)
• M66: 46,560,841 km (0.098 R)
• M67: 47,166,713 km (0.079 R)
• M68: 47,369,268 km (0.064 R)
• M69: 47,572,123 km (0.088 R)
• M70: 48,897,859 km (0.114 R)
• M71: 50,856,993 km (0.094 R)
• M72: 52,107,482 km (0.117 R)
• M73: 53,684,841 km (0.089 R)
• M74: 54,002,288 km (0.051 R)
• M75: 54,214,119 km (0.104 R)
• M76: 55,384,572 km (0.091 R)
• M77: 56,348,432 km (0.091 R)
• M78: 56,670,965 km (0.11 R)
• M79: 56,778,675 km (0.075 R)
• M80: 60,919,095 km (0.107 R)
• M81: 61,692,367 km (0.083 R)
• M82: 65,155,707 km (0.12 R)
• M83: 65,946,481 km (0.079 R)
• M84: 67,081,630 km (0.116 R)
• M85: 67,309,468 km (0.079 R)
• M86: 67,765,741 km (0.091 R)
• M87: 68,566,838 km (0.111 R)
• M88: 69,141,144 km (0.116 R)
• M89: 75,916,731 km (0.111 R)
• M90: 76,154,142 km (0.057 R)
• M91: 76,391,853 km (0.09 R)
• M92: 77,344,792 km (0.087 R)
• M93: 78,781,679 km (0.081 R)
• M94: 80,227,393 km (0.106 R)
• M95: 80,348,268 km (0.115 R)
• M96: 80,711,342 km (0.11 R)
• M97: 80,832,367 km (0.092 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: 279 - 14,208 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit