🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.4 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.8 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 636.5

Radius: 11.9

Gravity: 4.49 G

Time & Orbit

Eccentricity (e): 0.105

Orbit Range: 0.72 AU - 0.88 AU

Year: 477 Days

Day: 14.6 Hours

Environment

Temp: -156 °C

Axial Tilt: 38 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (43)

Outer Limit: 55,355,590 km

• M1: 155,881 km (0.051 R)
• M2: 289,023 km (0.052 R)
• M3: 370,105 km (0.041 R)
• M4: 472,729 km (0.115 R)
• M5: 580,141 km (0.078 R)
• M6: 661,073 km (0.093 R)
• M7: 755,020 km (0.102 R)
• M8: 871,856 km (0.073 R)
• M9: 962,662 km (0.059 R)
• M10: 1,056,909 km (0.087 R)
• M11: 1,154,596 km (0.115 R)
• M12: 1,286,392 km (0.104 R)
• M13: 1,380,788 km (0.064 R)
• M14: 1,461,422 km (0.102 R)
• M15: 1,582,596 km (0.116 R)
• M16: 1,678,638 km (0.117 R)
• M17: 1,936,694 km (0.092 R)
• M18: 2,033,783 km (0.078 R)
• M19: 2,163,784 km (0.097 R)
• M20: 2,296,776 km (0.098 R)
• M21: 2,458,641 km (0.098 R)
• M22: 2,544,211 km (0.08 R)
• M23: 2,637,710 km (0.1 R)
• M24: 3,009,161 km (0.032 R)
• M25: 3,108,195 km (0.107 R)
• M26: 3,208,276 km (0.112 R)
• M27: 3,419,359 km (0.115 R)
• M28: 3,619,969 km (0.088 R)
• M29: 3,740,695 km (0.113 R)
• M30: 3,832,249 km (0.116 R)
• M31: 4,048,567 km (0.113 R)
• M32: 4,142,515 km (0.044 R)
• M33: 4,316,796 km (0.096 R)
• M34: 4,461,158 km (0.107 R)
• M35: 4,542,091 km (0.067 R)
• M36: 4,631,700 km (0.11 R)
• M37: 4,771,424 km (0.07 R)
• M38: 4,845,924 km (0.099 R)
• M39: 5,164,717 km (0.078 R)
• M40: 5,481,864 km (0.096 R)
• M41: 5,586,134 km (0.11 R)
• M42: 5,664,823 km (0.101 R)
• M43: 5,956,239 km (0.04 R)

Planet 2 - Gas Giant

Semi-Major Axis: 3.14 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 431.1

Radius: 15

Gravity: 1.92 G

Time & Orbit

Eccentricity (e): 0.199

Orbit Range: 2.52 AU - 3.76 AU

Year: 3710 Days

Day: 9.3 Hours

Environment

Temp: -222 °C

Axial Tilt: 21.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (70)

Outer Limit: 55,355,590 km

• M1: 204,500 km (0.062 R)
• M2: 330,163 km (0.044 R)
• M3: 584,329 km (0.105 R)
• M4: 716,723 km (0.088 R)
• M5: 831,465 km (0.052 R)
• M6: 964,009 km (0.118 R)
• M7: 1,093,411 km (0.055 R)
• M8: 1,194,838 km (0.087 R)
• M9: 1,595,611 km (0.077 R)
• M10: 1,712,447 km (0.115 R)
• M11: 1,818,961 km (0.064 R)
• M12: 1,996,832 km (0.095 R)
• M13: 2,238,732 km (0.051 R)
• M14: 2,385,637 km (0.114 R)
• M15: 2,490,505 km (0.092 R)
• M16: 2,751,703 km (0.076 R)
• M17: 3,168,932 km (0.077 R)
• M18: 3,503,881 km (0.079 R)
• M19: 4,502,447 km (0.115 R)
• M20: 4,671,044 km (0.097 R)
• M21: 5,033,669 km (0.102 R)
• M22: 5,726,008 km (0.086 R)
• M23: 5,847,781 km (0.031 R)
• M24: 6,032,085 km (0.08 R)
• M25: 6,176,746 km (0.103 R)
• M26: 6,448,566 km (0.075 R)
• M27: 6,554,182 km (0.064 R)
• M28: 6,960,639 km (0.077 R)
• M29: 7,419,755 km (0.115 R)
• M30: 7,731,368 km (0.094 R)
• M31: 7,979,102 km (0.108 R)
• M32: 8,367,458 km (0.071 R)
• M33: 8,808,771 km (0.118 R)
• M34: 9,186,356 km (0.114 R)
• M35: 9,377,094 km (0.039 R)
• M36: 9,472,986 km (0.096 R)
• M37: 9,690,052 km (0.067 R)
• M38: 9,835,611 km (0.049 R)
• M39: 10,030,836 km (0.096 R)
• M40: 10,301,459 km (0.094 R)
• M41: 10,574,475 km (0.077 R)
• M42: 11,178,551 km (0.106 R)
• M43: 11,280,278 km (0.066 R)
• M44: 11,382,453 km (0.068 R)
• M45: 11,587,552 km (0.109 R)
• M46: 11,742,086 km (0.116 R)
• M47: 11,871,489 km (0.073 R)
• M48: 12,499,351 km (0.065 R)
• M49: 12,923,910 km (0.118 R)
• M50: 14,253,536 km (0.107 R)
• M51: 14,474,791 km (0.11 R)
• M52: 14,585,792 km (0.077 R)
• M53: 14,725,068 km (0.106 R)
• M54: 15,512,850 km (0.05 R)
• M55: 15,826,108 km (0.089 R)
• M56: 15,969,124 km (0.091 R)
• M57: 16,516,802 km (0.066 R)
• M58: 16,720,105 km (0.085 R)
• M59: 17,335,252 km (0.077 R)
• M60: 17,571,467 km (0.075 R)
• M61: 17,808,729 km (0.095 R)
• M62: 17,987,498 km (0.12 R)
• M63: 18,497,029 km (0.085 R)
• M64: 19,285,709 km (0.071 R)
• M65: 19,622,603 km (0.117 R)
• M66: 20,023,376 km (0.102 R)
• M67: 20,364,609 km (0.09 R)
• M68: 20,676,371 km (0.095 R)
• M69: 20,864,265 km (0.084 R)
• M70: 21,052,759 km (0.057 R)

Planet 3 - Gas Giant

Semi-Major Axis: 3.46 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 599.1

Radius: 14.6

Gravity: 2.81 G

Time & Orbit

Eccentricity (e): 0.24

Orbit Range: 2.63 AU - 4.29 AU

Year: 4292 Days

Day: 9.8 Hours

Environment

Temp: -210 °C

Axial Tilt: 9.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 55,355,590 km

• M1: 188,194 km (0.092 R)
• M2: 506,538 km (0.11 R)
• M3: 630,705 km (0.095 R)
• M4: 778,657 km (0.068 R)
• M5: 1,244,804 km (0.073 R)
• M6: 1,353,711 km (0.029 R)
• M7: 2,242,472 km (0.11 R)
• M8: 2,691,864 km (0.091 R)
• M9: 2,817,825 km (0.119 R)
• M10: 3,283,972 km (0.099 R)
• M11: 3,855,736 km (0.112 R)
• M12: 3,998,452 km (0.091 R)
• M13: 4,331,457 km (0.108 R)
• M14: 4,673,587 km (0.118 R)
• M15: 5,002,403 km (0.098 R)
• M16: 5,682,924 km (0.082 R)
• M17: 6,392,766 km (0.107 R)
• M18: 6,709,165 km (0.086 R)
• M19: 6,881,801 km (0.113 R)
• M20: 7,055,784 km (0.112 R)
• M21: 7,155,865 km (0.033 R)
• M22: 7,382,954 km (0.113 R)
• M23: 7,638,018 km (0.12 R)
• M24: 7,973,866 km (0.075 R)
• M25: 8,130,644 km (0.042 R)
• M26: 8,394,086 km (0.096 R)
• M27: 8,606,964 km (0.103 R)
• M28: 8,875,492 km (0.092 R)
• M29: 8,983,801 km (0.117 R)
• M30: 9,311,121 km (0.104 R)
• M31: 9,642,480 km (0.074 R)
• M32: 10,146,625 km (0.086 R)
• M33: 10,316,718 km (0.106 R)
• M34: 10,977,193 km (0.049 R)
• M35: 11,122,602 km (0.061 R)
• M36: 11,444,836 km (0.06 R)
• M37: 11,710,821 km (0.096 R)
• M38: 11,829,751 km (0.096 R)
• M39: 12,008,670 km (0.074 R)
• M40: 13,194,532 km (0.113 R)
• M41: 13,691,796 km (0.042 R)
• M42: 14,005,652 km (0.091 R)
• M43: 14,131,912 km (0.103 R)
• M44: 14,290,337 km (0.081 R)
• M45: 14,512,938 km (0.112 R)
• M46: 14,897,405 km (0.111 R)
• M47: 15,252,700 km (0.097 R)
• M48: 15,545,612 km (0.074 R)
• M49: 16,004,878 km (0.064 R)
• M50: 16,501,842 km (0.066 R)
• M51: 16,936,873 km (0.04 R)
• M52: 17,138,830 km (0.036 R)
• M53: 17,273,917 km (0.104 R)
• M54: 17,920,628 km (0.046 R)
• M55: 18,126,475 km (0.095 R)
• M56: 18,575,268 km (0.076 R)
• M57: 18,783,509 km (0.083 R)
• M58: 19,907,886 km (0.101 R)
• M59: 20,014,550 km (0.11 R)
• M60: 20,371,041 km (0.117 R)
• M61: 20,514,206 km (0.059 R)
• M62: 20,657,671 km (0.093 R)
• M63: 21,054,105 km (0.11 R)
• M64: 21,927,757 km (0.089 R)
• M65: 22,221,567 km (0.037 R)
• M66: 22,479,773 km (0.104 R)
• M67: 22,590,774 km (0.105 R)
• M68: 22,813,226 km (0.073 R)
• M69: 24,087,800 km (0.072 R)
• M70: 24,277,191 km (0.05 R)
• M71: 24,657,469 km (0.116 R)
• M72: 25,193,029 km (0.107 R)
• M73: 25,385,412 km (0.091 R)
• M74: 25,887,463 km (0.114 R)

Planet 4 - Gas Giant

Semi-Major Axis: 5.17 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 711.3

Radius: 13.3

Gravity: 4.02 G

Time & Orbit

Eccentricity (e): 0.165

Orbit Range: 4.32 AU - 6.02 AU

Year: 7839 Days

Day: 11.9 Hours

Environment

Temp: -220 °C

Axial Tilt: 24.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (86)

Outer Limit: 55,355,590 km

• M1: 212,878 km (0.101 R)
• M2: 378,931 km (0.114 R)
• M3: 992,731 km (0.11 R)
• M4: 1,112,859 km (0.1 R)
• M5: 1,238,371 km (0.096 R)
• M6: 2,158,996 km (0.11 R)
• M7: 2,272,392 km (0.062 R)
• M8: 2,529,251 km (0.078 R)
• M9: 3,489,071 km (0.098 R)
• M10: 3,596,333 km (0.082 R)
• M11: 3,869,199 km (0.114 R)
• M12: 4,177,371 km (0.102 R)
• M13: 4,377,682 km (0.045 R)
• M14: 4,610,606 km (0.074 R)
• M15: 5,272,278 km (0.112 R)
• M16: 5,551,577 km (0.093 R)
• M17: 5,708,954 km (0.112 R)
• M18: 5,835,963 km (0.084 R)
• M19: 5,963,719 km (0.059 R)
• M20: 6,157,448 km (0.031 R)
• M21: 6,584,101 km (0.105 R)
• M22: 6,952,860 km (0.052 R)
• M23: 7,570,699 km (0.106 R)
• M24: 7,675,418 km (0.076 R)
• M25: 8,099,079 km (0.105 R)
• M26: 8,277,849 km (0.099 R)
• M27: 8,385,858 km (0.082 R)
• M28: 9,154,492 km (0.071 R)
• M29: 9,566,185 km (0.041 R)
• M30: 9,945,715 km (0.114 R)
• M31: 10,485,315 km (0.077 R)
• M32: 11,392,775 km (0.103 R)
• M33: 12,161,260 km (0.101 R)
• M34: 12,738,408 km (0.081 R)
• M35: 13,620,737 km (0.107 R)
• M36: 13,962,119 km (0.101 R)
• M37: 14,090,773 km (0.082 R)
• M38: 14,609,728 km (0.077 R)
• M39: 14,696,794 km (0.103 R)
• M40: 15,311,342 km (0.03 R)
• M41: 15,666,338 km (0.052 R)
• M42: 15,755,498 km (0.106 R)
• M43: 16,249,022 km (0.052 R)
• M44: 16,384,557 km (0.097 R)
• M45: 16,747,631 km (0.091 R)
• M46: 16,884,513 km (0.113 R)
• M47: 17,713,435 km (0.083 R)
• M48: 18,132,908 km (0.042 R)
• M49: 18,697,340 km (0.12 R)
• M50: 18,791,886 km (0.103 R)
• M51: 18,934,154 km (0.115 R)
• M52: 19,363,051 km (0.042 R)
• M53: 19,795,239 km (0.118 R)
• M54: 21,012,218 km (0.03 R)
• M55: 21,159,871 km (0.072 R)
• M56: 21,953,338 km (0.12 R)
• M57: 22,705,965 km (0.116 R)
• M58: 23,620,457 km (0.076 R)
• M59: 23,774,094 km (0.083 R)
• M60: 23,927,880 km (0.108 R)
• M61: 24,702,498 km (0.119 R)
• M62: 25,223,398 km (0.09 R)
• M63: 26,064,437 km (0.119 R)
• M64: 26,382,332 km (0.111 R)
• M65: 27,289,644 km (0.072 R)
• M66: 27,882,201 km (0.052 R)
• M67: 28,588,003 km (0.11 R)
• M68: 29,409,745 km (0.104 R)
• M69: 31,132,364 km (0.088 R)
• M70: 32,147,685 km (0.043 R)
• M71: 32,602,313 km (0.035 R)
• M72: 32,830,599 km (0.109 R)
• M73: 33,288,518 km (0.046 R)
• M74: 33,518,151 km (0.108 R)
• M75: 33,748,532 km (0.084 R)
• M76: 34,094,851 km (0.055 R)
• M77: 34,674,842 km (0.091 R)
• M78: 35,024,452 km (0.101 R)
• M79: 36,257,138 km (0.108 R)
• M80: 37,324,968 km (0.101 R)
• M81: 37,563,726 km (0.103 R)
• M82: 37,683,255 km (0.102 R)
• M83: 38,282,843 km (0.074 R)
• M84: 38,403,269 km (0.044 R)
• M85: 39,248,946 km (0.06 R)
• M86: 40,651,576 km (0.051 R)

Planet 5 - Ice Giant

Semi-Major Axis: 5.77 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 59.3

Radius: 4.8

Gravity: 2.57 G

Time & Orbit

Eccentricity (e): 0.022

Orbit Range: 5.64 AU - 5.9 AU

Year: 9243 Days

Day: 16.4 Hours

Environment

Temp: -217 °C

Axial Tilt: 21.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 55,355,590 km

• M1: 264,040 km (0.106 R)
• M2: 392,096 km (0.104 R)
• M3: 628,610 km (0.116 R)
• M4: 675,135 km (0.049 R)
• M5: 904,020 km (0.067 R)
• M6: 1,307,635 km (0.078 R)
• M7: 1,355,506 km (0.081 R)
• M8: 1,540,858 km (0.101 R)
• M9: 1,694,794 km (0.068 R)
• M10: 1,907,971 km (0.089 R)
• M11: 2,031,689 km (0.043 R)
• M12: 2,243,519 km (0.048 R)
• M13: 2,330,286 km (0.11 R)
• M14: 3,000,036 km (0.095 R)
• M15: 3,127,792 km (0.081 R)
• M16: 3,388,841 km (0.083 R)
• M17: 3,521,983 km (0.116 R)
• M18: 3,759,245 km (0.059 R)
• M19: 3,845,114 km (0.108 R)
• M20: 4,054,102 km (0.051 R)
• M21: 4,647,856 km (0.076 R)
• M22: 4,758,708 km (0.094 R)
• M23: 4,795,809 km (0.071 R)
• M24: 4,870,458 km (0.106 R)
• M25: 4,964,106 km (0.112 R)
• M26: 5,191,645 km (0.095 R)
• M27: 5,249,090 km (0.073 R)
• M28: 5,345,282 km (0.037 R)
• M29: 5,461,369 km (0.078 R)
• M30: 6,034,629 km (0.07 R)
• M31: 6,175,849 km (0.08 R)
• M32: 6,358,957 km (0.093 R)
• M33: 6,420,441 km (0.056 R)
• M34: 6,856,070 km (0.092 R)
• M35: 7,045,761 km (0.111 R)
• M36: 7,173,218 km (0.095 R)
• M37: 7,625,153 km (0.038 R)
• M38: 7,975,661 km (0.083 R)
• M39: 8,019,792 km (0.054 R)
• M40: 8,828,967 km (0.084 R)
• M41: 8,966,298 km (0.103 R)
• M42: 9,196,828 km (0.07 R)
• M43: 9,640,236 km (0.052 R)
• M44: 9,757,970 km (0.094 R)
• M45: 10,354,417 km (0.099 R)
• M46: 10,499,227 km (0.099 R)
• M47: 10,815,477 km (0.104 R)
• M48: 12,060,580 km (0.096 R)
• M49: 12,213,021 km (0.086 R)
• M50: 12,442,952 km (0.064 R)
• M51: 13,692,843 km (0.058 R)
• M52: 13,904,972 km (0.081 R)
• M53: 14,225,411 km (0.062 R)
• M54: 14,955,000 km (0.112 R)
• M55: 15,283,068 km (0.09 R)
• M56: 15,641,205 km (0.079 R)
• M57: 16,366,007 km (0.091 R)
• M58: 16,845,618 km (0.112 R)
• M59: 17,358,589 km (0.092 R)
• M60: 17,530,776 km (0.07 R)
• M61: 18,195,739 km (0.117 R)
• M62: 19,134,764 km (0.091 R)
• M63: 19,610,186 km (0.072 R)
• M64: 19,729,566 km (0.093 R)
• M65: 19,969,221 km (0.078 R)

Planet 6 - Ice Giant

Semi-Major Axis: 10.93 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 181.7

Radius: 5.9

Gravity: 5.22 G

Time & Orbit

Eccentricity (e): 0.165

Orbit Range: 9.13 AU - 12.73 AU

Year: 24097 Days

Day: 21.5 Hours

Environment

Temp: -239 °C

Axial Tilt: 2.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 55,355,590 km

• M1: 92,900 km (0.068 R)
• M2: 229,782 km (0.108 R)
• M3: 515,664 km (0.068 R)
• M4: 601,084 km (0.101 R)
• M5: 747,840 km (0.065 R)
• M6: 825,631 km (0.041 R)
• M7: 926,759 km (0.107 R)
• M8: 968,497 km (0.051 R)
• M9: 1,231,639 km (0.086 R)
• M10: 1,769,294 km (0.061 R)
• M11: 2,314,129 km (0.059 R)
• M12: 2,575,327 km (0.118 R)
• M13: 2,785,064 km (0.118 R)
• M14: 3,220,992 km (0.111 R)
• M15: 3,611,442 km (0.043 R)
• M16: 3,678,013 km (0.069 R)
• M17: 3,982,445 km (0.107 R)
• M18: 4,651,746 km (0.104 R)
• M19: 4,724,301 km (0.114 R)
• M20: 4,797,155 km (0.068 R)
• M21: 4,980,861 km (0.089 R)
• M22: 5,242,059 km (0.101 R)
• M23: 5,431,450 km (0.088 R)
• M24: 5,546,191 km (0.087 R)
• M25: 5,973,443 km (0.078 R)
• M26: 6,052,281 km (0.116 R)
• M27: 6,091,924 km (0.106 R)
• M28: 8,751,475 km (0.114 R)
• M29: 8,976,171 km (0.069 R)
• M30: 9,339,395 km (0.108 R)
• M31: 10,410,665 km (0.114 R)
• M32: 10,458,088 km (0.057 R)
• M33: 11,178,551 km (0.09 R)
• M34: 11,471,314 km (0.097 R)
• M35: 11,618,519 km (0.059 R)
• M36: 12,870,054 km (0.112 R)
• M37: 12,921,067 km (0.117 R)
• M38: 13,849,472 km (0.073 R)
• M39: 15,067,049 km (0.106 R)
• M40: 15,120,754 km (0.043 R)
• M41: 15,390,180 km (0.096 R)
• M42: 15,552,643 km (0.101 R)
• M43: 16,043,474 km (0.079 R)
• M44: 16,318,285 km (0.074 R)
• M45: 16,594,742 km (0.058 R)
• M46: 16,705,744 km (0.117 R)
• M47: 17,152,293 km (0.074 R)
• M48: 19,209,563 km (0.119 R)
• M49: 19,912,524 km (0.067 R)
• M50: 20,089,498 km (0.069 R)
• M51: 21,042,586 km (0.103 R)
• M52: 21,706,352 km (0.09 R)
• M53: 22,561,004 km (0.114 R)
• M54: 22,745,608 km (0.098 R)
• M55: 23,801,021 km (0.103 R)
• M56: 23,926,235 km (0.12 R)
• M57: 25,317,944 km (0.063 R)
• M58: 27,192,255 km (0.03 R)
• M59: 27,717,045 km (0.09 R)
• M60: 28,843,517 km (0.11 R)
• M61: 30,120,035 km (0.088 R)
• M62: 30,935,792 km (0.104 R)
• M63: 31,689,915 km (0.034 R)
• M64: 31,827,695 km (0.063 R)
• M65: 31,896,660 km (0.106 R)
• M66: 32,242,081 km (0.067 R)
• M67: 32,311,345 km (0.12 R)
• M68: 32,658,412 km (0.054 R)
• M69: 35,050,632 km (0.12 R)
• M70: 35,478,631 km (0.088 R)
• M71: 35,764,961 km (0.084 R)
• M72: 36,195,953 km (0.113 R)
• M73: 37,207,982 km (0.105 R)
• M74: 38,669,853 km (0.104 R)
• M75: 39,630,122 km (0.084 R)
• M76: 40,001,573 km (0.08 R)
• M77: 40,299,572 km (0.094 R)
• M78: 40,523,520 km (0.084 R)
• M79: 40,598,169 km (0.027 R)
• M80: 41,649,543 km (0.119 R)
• M81: 42,405,910 km (0.047 R)
• M82: 42,709,594 km (0.056 R)
• M83: 43,166,765 km (0.104 R)
• M84: 43,395,949 km (0.115 R)
• M85: 43,855,364 km (0.08 R)
• M86: 44,316,574 km (0.092 R)
• M87: 45,166,140 km (0.107 R)
• M88: 45,243,632 km (0.1 R)
• M89: 45,631,838 km (0.035 R)
• M90: 46,959,819 km (0.073 R)
• M91: 49,813,847 km (0.101 R)
• M92: 49,893,882 km (0.116 R)
• M93: 50,134,286 km (0.032 R)
• M94: 50,535,956 km (0.099 R)
• M95: 51,747,399 km (0.095 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: 203 - 12,822 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit