🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.41 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.81 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 42.5

Radius: 10.2

Gravity: 0.41 G

Time & Orbit

Eccentricity (e): 0.027

Orbit Range: 0.79 AU - 0.83 AU

Year: 494 Days

Day: 12.1 Hours

Environment

Temp: -159 °C

Axial Tilt: 34.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (22)

Outer Limit: 82,499,274 km

• M1: 134,189 km (0.109 R)
• M2: 214,224 km (0.111 R)
• M3: 323,281 km (0.034 R)
• M4: 391,348 km (0.07 R)
• M5: 510,129 km (0.115 R)
• M6: 595,848 km (0.088 R)
• M7: 691,441 km (0.105 R)
• M8: 792,869 km (0.055 R)
• M9: 939,774 km (0.115 R)
• M10: 1,088,175 km (0.111 R)
• M11: 1,153,100 km (0.092 R)
• M12: 1,216,679 km (0.117 R)
• M13: 1,307,186 km (0.106 R)
• M14: 1,402,929 km (0.118 R)
• M15: 1,598,752 km (0.061 R)
• M16: 1,761,964 km (0.096 R)
• M17: 1,871,769 km (0.082 R)
• M18: 2,020,618 km (0.064 R)
• M19: 2,105,141 km (0.059 R)
• M20: 2,208,065 km (0.088 R)
• M21: 2,277,628 km (0.109 R)
• M22: 2,348,088 km (0.112 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.7 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 940.8

Radius: 8.3

Gravity: 13.66 G

Time & Orbit

Eccentricity (e): 0.093

Orbit Range: 1.54 AU - 1.86 AU

Year: 1503 Days

Day: 9.3 Hours

Environment

Temp: -188 °C

Axial Tilt: 35.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 82,499,274 km

• M1: 105,616 km (0.112 R)
• M2: 173,384 km (0.1 R)
• M3: 227,389 km (0.09 R)
• M4: 285,732 km (0.114 R)
• M5: 351,106 km (0.059 R)
• M6: 507,137 km (0.109 R)
• M7: 641,625 km (0.087 R)
• M8: 694,284 km (0.085 R)
• M9: 756,516 km (0.104 R)
• M10: 837,150 km (0.077 R)
• M11: 998,566 km (0.068 R)
• M12: 1,115,103 km (0.095 R)
• M13: 1,245,701 km (0.111 R)
• M14: 1,421,329 km (0.111 R)
• M15: 1,481,767 km (0.062 R)
• M16: 1,584,241 km (0.109 R)
• M17: 1,636,451 km (0.039 R)
• M18: 1,721,273 km (0.12 R)
• M19: 1,829,432 km (0.113 R)
• M20: 2,063,852 km (0.055 R)
• M21: 2,155,705 km (0.09 R)
• M22: 2,415,557 km (0.104 R)
• M23: 2,573,831 km (0.077 R)
• M24: 2,648,032 km (0.115 R)
• M25: 2,900,852 km (0.12 R)
• M26: 3,649,440 km (0.083 R)
• M27: 3,775,102 km (0.102 R)
• M28: 4,103,021 km (0.097 R)
• M29: 4,160,915 km (0.118 R)
• M30: 4,307,072 km (0.089 R)
• M31: 4,589,363 km (0.109 R)
• M32: 4,649,651 km (0.082 R)
• M33: 4,740,457 km (0.07 R)
• M34: 5,016,465 km (0.093 R)
• M35: 5,140,931 km (0.098 R)
• M36: 5,203,463 km (0.084 R)
• M37: 5,313,567 km (0.083 R)
• M38: 5,810,680 km (0.09 R)
• M39: 6,155,803 km (0.057 R)
• M40: 6,456,943 km (0.088 R)
• M41: 6,626,438 km (0.034 R)
• M42: 7,004,322 km (0.112 R)
• M43: 7,248,466 km (0.095 R)
• M44: 7,477,799 km (0.1 R)
• M45: 7,602,265 km (0.104 R)
• M46: 7,655,821 km (0.065 R)
• M47: 7,763,232 km (0.072 R)
• M48: 7,853,140 km (0.073 R)
• M49: 8,015,903 km (0.036 R)
• M50: 8,143,360 km (0.092 R)
• M51: 8,271,416 km (0.071 R)
• M52: 8,381,669 km (0.099 R)
• M53: 8,659,622 km (0.111 R)
• M54: 8,715,572 km (0.049 R)
• M55: 8,771,522 km (0.068 R)
• M56: 8,884,019 km (0.048 R)
• M57: 9,723,562 km (0.107 R)
• M58: 9,878,995 km (0.091 R)
• M59: 10,350,078 km (0.054 R)
• M60: 10,628,330 km (0.051 R)
• M61: 10,728,262 km (0.073 R)
• M62: 11,090,588 km (0.095 R)
• M63: 11,457,103 km (0.069 R)
• M64: 11,682,995 km (0.087 R)
• M65: 11,765,573 km (0.09 R)
• M66: 11,910,384 km (0.118 R)
• M67: 12,222,894 km (0.075 R)
• M68: 12,559,040 km (0.105 R)
• M69: 12,770,871 km (0.058 R)
• M70: 12,834,600 km (0.066 R)
• M71: 13,133,496 km (0.093 R)
• M72: 13,434,637 km (0.065 R)
• M73: 13,716,330 km (0.088 R)
• M74: 13,999,967 km (0.089 R)
• M75: 14,241,568 km (0.06 R)
• M76: 14,329,681 km (0.048 R)
• M77: 14,573,226 km (0.077 R)
• M78: 14,706,518 km (0.059 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 737

Radius: 11.1

Gravity: 5.98 G

Time & Orbit

Eccentricity (e): 0.02

Orbit Range: 2.53 AU - 2.63 AU

Year: 2811 Days

Day: 9.5 Hours

Environment

Temp: -205 °C

Axial Tilt: 22.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 82,499,274 km

• M1: 145,409 km (0.106 R)
• M2: 275,110 km (0.11 R)
• M3: 430,543 km (0.065 R)
• M4: 585,376 km (0.082 R)
• M5: 712,834 km (0.073 R)
• M6: 830,119 km (0.102 R)
• M7: 1,108,071 km (0.115 R)
• M8: 1,403,378 km (0.113 R)
• M9: 1,478,027 km (0.105 R)
• M10: 1,763,759 km (0.076 R)
• M11: 2,024,807 km (0.057 R)
• M12: 2,210,757 km (0.069 R)
• M13: 2,569,044 km (0.103 R)
• M14: 2,786,709 km (0.108 R)
• M15: 2,994,201 km (0.116 R)
• M16: 3,091,739 km (0.081 R)
• M17: 3,475,757 km (0.088 R)
• M18: 3,578,381 km (0.113 R)
• M19: 4,307,222 km (0.118 R)
• M20: 4,436,325 km (0.059 R)
• M21: 4,792,966 km (0.117 R)
• M22: 4,926,856 km (0.08 R)
• M23: 5,816,664 km (0.108 R)
• M24: 5,939,035 km (0.101 R)
• M25: 6,521,719 km (0.072 R)
• M26: 6,670,120 km (0.038 R)
• M27: 6,776,933 km (0.086 R)
• M28: 7,518,340 km (0.07 R)
• M29: 7,629,491 km (0.073 R)
• M30: 8,285,328 km (0.054 R)
• M31: 8,400,220 km (0.111 R)
• M32: 8,701,510 km (0.117 R)
• M33: 8,818,346 km (0.105 R)
• M34: 8,888,657 km (0.1 R)
• M35: 9,290,776 km (0.053 R)
• M36: 9,386,369 km (0.037 R)
• M37: 9,530,132 km (0.096 R)
• M38: 10,039,513 km (0.103 R)
• M39: 10,309,986 km (0.096 R)
• M40: 10,433,554 km (0.097 R)
• M41: 10,657,502 km (0.086 R)
• M42: 10,732,450 km (0.093 R)
• M43: 11,160,749 km (0.102 R)
• M44: 11,466,527 km (0.099 R)
• M45: 11,543,420 km (0.085 R)
• M46: 11,646,045 km (0.089 R)
• M47: 11,774,998 km (0.096 R)
• M48: 11,852,490 km (0.115 R)
• M49: 12,034,102 km (0.106 R)
• M50: 12,295,150 km (0.078 R)
• M51: 12,743,345 km (0.109 R)
• M52: 13,062,886 km (0.105 R)
• M53: 13,143,220 km (0.07 R)
• M54: 13,493,130 km (0.106 R)
• M55: 13,628,516 km (0.078 R)
• M56: 13,955,387 km (0.103 R)
• M57: 14,119,645 km (0.067 R)
• M58: 14,312,327 km (0.066 R)
• M59: 14,588,934 km (0.043 R)
• M60: 15,091,433 km (0.09 R)
• M61: 15,571,194 km (0.117 R)
• M62: 16,343,418 km (0.068 R)
• M63: 16,603,718 km (0.091 R)
• M64: 16,748,828 km (0.062 R)
• M65: 16,865,215 km (0.059 R)
• M66: 16,981,901 km (0.036 R)
• M67: 17,451,489 km (0.1 R)
• M68: 17,776,715 km (0.112 R)
• M69: 17,865,726 km (0.041 R)
• M70: 18,253,483 km (0.096 R)
• M71: 18,734,291 km (0.038 R)
• M72: 18,824,947 km (0.054 R)
• M73: 19,037,077 km (0.029 R)
• M74: 19,189,068 km (0.082 R)
• M75: 19,341,359 km (0.102 R)
• M76: 19,494,099 km (0.057 R)
• M77: 20,171,178 km (0.111 R)
• M78: 20,512,561 km (0.117 R)
• M79: 20,668,292 km (0.1 R)

Planet 4 - Gas Giant

Semi-Major Axis: 5.01 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 147

Radius: 14.9

Gravity: 0.66 G

Time & Orbit

Eccentricity (e): 0.227

Orbit Range: 3.87 AU - 6.15 AU

Year: 7606 Days

Day: 14.8 Hours

Environment

Temp: -232 °C

Axial Tilt: 31.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 82,499,274 km

• M1: 216,468 km (0.094 R)
• M2: 334,052 km (0.049 R)
• M3: 569,519 km (0.071 R)
• M4: 672,592 km (0.085 R)
• M5: 783,743 km (0.053 R)
• M6: 1,122,732 km (0.094 R)
• M7: 1,221,317 km (0.085 R)
• M8: 1,619,098 km (0.075 R)
• M9: 2,088,536 km (0.103 R)
• M10: 2,228,410 km (0.117 R)
• M11: 2,567,099 km (0.113 R)
• M12: 2,717,595 km (0.088 R)
• M13: 2,819,471 km (0.087 R)
• M14: 2,922,843 km (0.077 R)
• M15: 3,312,695 km (0.104 R)
• M16: 3,663,053 km (0.032 R)
• M17: 3,929,038 km (0.063 R)
• M18: 4,025,529 km (0.099 R)
• M19: 4,122,917 km (0.1 R)
• M20: 4,221,203 km (0.098 R)
• M21: 4,399,973 km (0.105 R)
• M22: 5,438,780 km (0.117 R)
• M23: 5,568,482 km (0.051 R)
• M24: 5,963,869 km (0.075 R)
• M25: 6,210,107 km (0.069 R)
• M26: 6,345,792 km (0.091 R)
• M27: 7,133,724 km (0.071 R)
• M28: 7,563,519 km (0.112 R)
• M29: 7,660,159 km (0.074 R)
• M30: 9,082,087 km (0.115 R)
• M31: 9,548,084 km (0.114 R)
• M32: 9,862,988 km (0.119 R)
• M33: 10,128,225 km (0.11 R)
• M34: 10,395,706 km (0.12 R)
• M35: 10,638,503 km (0.087 R)
• M36: 10,992,452 km (0.093 R)
• M37: 11,102,107 km (0.115 R)
• M38: 11,433,466 km (0.113 R)
• M39: 11,712,167 km (0.119 R)
• M40: 11,993,112 km (0.112 R)
• M41: 12,134,332 km (0.102 R)
• M42: 12,447,141 km (0.039 R)
• M43: 12,647,602 km (0.086 R)
• M44: 12,791,516 km (0.057 R)
• M45: 12,907,005 km (0.032 R)
• M46: 13,489,539 km (0.12 R)
• M47: 13,666,065 km (0.114 R)
• M48: 13,961,969 km (0.039 R)
• M49: 14,140,440 km (0.05 R)
• M50: 14,983,723 km (0.077 R)
• M51: 15,227,567 km (0.074 R)
• M52: 16,185,293 km (0.058 R)
• M53: 16,435,570 km (0.069 R)
• M54: 16,592,648 km (0.063 R)
• M55: 17,035,308 km (0.103 R)
• M56: 17,289,924 km (0.12 R)
• M57: 17,932,147 km (0.093 R)
• M58: 18,029,087 km (0.071 R)
• M59: 18,713,048 km (0.045 R)
• M60: 19,041,715 km (0.09 R)
• M61: 19,838,473 km (0.111 R)
• M62: 20,039,383 km (0.039 R)
• M63: 20,409,338 km (0.117 R)
• M64: 20,544,425 km (0.113 R)
• M65: 20,781,687 km (0.045 R)
• M66: 21,293,013 km (0.116 R)
• M67: 21,567,525 km (0.091 R)
• M68: 21,946,756 km (0.094 R)
• M69: 22,711,799 km (0.114 R)
• M70: 23,027,451 km (0.119 R)
• M71: 23,238,533 km (0.047 R)
• M72: 23,450,364 km (0.107 R)

Planet 5 - Ice Giant

Semi-Major Axis: 9.21 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 531.5

Radius: 3.1

Gravity: 55.31 G

Time & Orbit

Eccentricity (e): 0.102

Orbit Range: 8.27 AU - 10.15 AU

Year: 18957 Days

Day: 19.6 Hours

Environment

Temp: -244 °C

Axial Tilt: 5.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 82,499,274 km

• M1: 49,666 km (0.046 R)
• M2: 138,528 km (0.05 R)
• M3: 162,463 km (0.116 R)
• M4: 229,334 km (0.039 R)
• M5: 337,642 km (0.06 R)
• M6: 461,210 km (0.075 R)
• M7: 792,420 km (0.105 R)
• M8: 908,358 km (0.094 R)
• M9: 1,004,849 km (0.115 R)
• M10: 1,054,366 km (0.045 R)
• M11: 1,368,521 km (0.028 R)
• M12: 1,451,249 km (0.099 R)
• M13: 2,075,670 km (0.069 R)
• M14: 2,300,067 km (0.08 R)
• M15: 2,365,591 km (0.049 R)
• M16: 2,565,903 km (0.118 R)
• M17: 2,599,861 km (0.097 R)
• M18: 3,018,436 km (0.114 R)
• M19: 3,054,340 km (0.046 R)
• M20: 3,090,243 km (0.107 R)
• M21: 4,233,171 km (0.084 R)
• M22: 4,354,046 km (0.091 R)
• M23: 4,475,968 km (0.082 R)
• M24: 4,598,938 km (0.039 R)
• M25: 4,681,665 km (0.099 R)
• M26: 5,059,699 km (0.094 R)
• M27: 5,145,120 km (0.115 R)
• M28: 8,115,535 km (0.115 R)
• M29: 8,215,466 km (0.111 R)
• M30: 8,977,817 km (0.088 R)
• M31: 9,132,950 km (0.102 R)
• M32: 9,551,076 km (0.109 R)
• M33: 9,709,500 km (0.065 R)
• M34: 9,815,565 km (0.045 R)
• M35: 9,922,079 km (0.117 R)
• M36: 10,189,859 km (0.096 R)
• M37: 11,620,463 km (0.11 R)
• M38: 11,676,712 km (0.062 R)
• M39: 12,416,474 km (0.09 R)
• M40: 12,647,154 km (0.092 R)
• M41: 12,879,180 km (0.091 R)
• M42: 13,702,417 km (0.047 R)
• M43: 15,152,619 km (0.054 R)
• M44: 16,083,566 km (0.084 R)
• M45: 16,146,248 km (0.117 R)
• M46: 16,714,420 km (0.059 R)
• M47: 17,289,026 km (0.115 R)
• M48: 17,611,110 km (0.077 R)
• M49: 18,130,364 km (0.101 R)
• M50: 18,261,113 km (0.11 R)
• M51: 18,326,487 km (0.036 R)
• M52: 19,718,495 km (0.029 R)
• M53: 20,733,367 km (0.101 R)
• M54: 20,938,316 km (0.069 R)
• M55: 21,006,832 km (0.106 R)
• M56: 21,075,348 km (0.11 R)
• M57: 22,883,837 km (0.068 R)
• M58: 23,237,336 km (0.093 R)
• M59: 25,031,464 km (0.083 R)
• M60: 28,371,236 km (0.118 R)
• M61: 28,826,911 km (0.063 R)
• M62: 29,591,955 km (0.085 R)
• M63: 30,673,996 km (0.113 R)
• M64: 30,751,787 km (0.114 R)
• M65: 31,690,364 km (0.1 R)
• M66: 32,321,218 km (0.111 R)
• M67: 32,479,643 km (0.088 R)
• M68: 34,723,910 km (0.08 R)
• M69: 36,357,219 km (0.101 R)
• M70: 36,604,355 km (0.066 R)
• M71: 36,686,933 km (0.117 R)
• M72: 36,769,511 km (0.07 R)
• M73: 38,433,937 km (0.064 R)
• M74: 38,517,712 km (0.103 R)
• M75: 38,769,635 km (0.074 R)
• M76: 40,804,914 km (0.113 R)
• M77: 41,491,119 km (0.079 R)
• M78: 45,420,756 km (0.095 R)
• M79: 47,115,251 km (0.071 R)
• M80: 47,474,585 km (0.102 R)
• M81: 47,654,551 km (0.077 R)
• M82: 48,739,435 km (0.031 R)
• M83: 49,376,124 km (0.053 R)
• M84: 50,015,355 km (0.112 R)
• M85: 54,661,267 km (0.073 R)
• M86: 56,271,837 km (0.111 R)
• M87: 56,367,131 km (0.05 R)
• M88: 59,152,045 km (0.112 R)
• M89: 59,345,775 km (0.108 R)
• M90: 59,733,831 km (0.116 R)
• M91: 59,928,159 km (0.057 R)
• M92: 61,883,104 km (0.118 R)
• M93: 64,954,348 km (0.104 R)
• M94: 65,654,616 km (0.059 R)

Planet 6 - Ice Giant

Semi-Major Axis: 10.06 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 745.7

Radius: 5.2

Gravity: 27.58 G

Time & Orbit

Eccentricity (e): 0.065

Orbit Range: 9.41 AU - 10.71 AU

Year: 21642 Days

Day: 18.7 Hours

Environment

Temp: -238 °C

Axial Tilt: 15.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 82,499,274 km

• M1: 93,798 km (0.113 R)
• M2: 247,435 km (0.071 R)
• M3: 315,502 km (0.12 R)
• M4: 410,197 km (0.071 R)
• M5: 675,285 km (0.057 R)
• M6: 825,481 km (0.118 R)
• M7: 1,276,219 km (0.086 R)
• M8: 1,462,469 km (0.079 R)
• M9: 2,035,877 km (0.048 R)
• M10: 3,154,570 km (0.094 R)
• M11: 3,491,465 km (0.06 R)
• M12: 4,018,049 km (0.078 R)
• M13: 6,412,513 km (0.101 R)
• M14: 6,677,301 km (0.107 R)
• M15: 6,837,969 km (0.104 R)
• M16: 7,716,109 km (0.092 R)
• M17: 9,216,874 km (0.111 R)
• M18: 9,636,048 km (0.081 R)
• M19: 10,804,856 km (0.111 R)
• M20: 11,310,197 km (0.063 R)
• M21: 11,501,683 km (0.085 R)
• M22: 11,758,692 km (0.085 R)
• M23: 11,823,169 km (0.028 R)
• M24: 12,147,796 km (0.112 R)
• M25: 12,475,116 km (0.103 R)
• M26: 15,056,876 km (0.075 R)
• M27: 15,620,860 km (0.053 R)
• M28: 15,691,769 km (0.046 R)
• M29: 15,834,187 km (0.109 R)
• M30: 16,624,363 km (0.093 R)
• M31: 17,280,349 km (0.094 R)
• M32: 18,467,408 km (0.054 R)
• M33: 19,298,574 km (0.039 R)
• M34: 19,757,092 km (0.088 R)
• M35: 19,910,878 km (0.103 R)
• M36: 21,626,915 km (0.077 R)
• M37: 23,146,830 km (0.109 R)
• M38: 23,715,302 km (0.052 R)
• M39: 24,124,302 km (0.118 R)
• M40: 25,115,239 km (0.086 R)
• M41: 25,281,591 km (0.09 R)
• M42: 25,699,418 km (0.104 R)
• M43: 26,456,982 km (0.108 R)
• M44: 27,736,044 km (0.112 R)
• M45: 27,822,062 km (0.12 R)
• M46: 28,426,288 km (0.108 R)
• M47: 29,472,426 km (0.085 R)
• M48: 29,823,832 km (0.073 R)
• M49: 30,088,470 km (0.107 R)
• M50: 31,961,735 km (0.078 R)
• M51: 34,795,418 km (0.084 R)
• M52: 35,820,013 km (0.116 R)
• M53: 36,571,443 km (0.047 R)
• M54: 36,949,178 km (0.09 R)
• M55: 37,994,269 km (0.049 R)
• M56: 38,472,683 km (0.095 R)
• M57: 38,952,892 km (0.073 R)
• M58: 39,435,195 km (0.073 R)
• M59: 39,628,626 km (0.11 R)
• M60: 40,016,533 km (0.097 R)
• M61: 41,089,748 km (0.083 R)
• M62: 43,363,935 km (0.118 R)
• M63: 44,264,963 km (0.117 R)
• M64: 46,595,548 km (0.043 R)
• M65: 47,415,344 km (0.089 R)
• M66: 47,518,268 km (0.112 R)
• M67: 47,827,187 km (0.083 R)
• M68: 47,930,260 km (0.065 R)
• M69: 48,446,971 km (0.101 R)
• M70: 49,903,606 km (0.116 R)
• M71: 52,009,345 km (0.116 R)
• M72: 53,500,537 km (0.119 R)
• M73: 55,871,962 km (0.064 R)
• M74: 56,306,843 km (0.104 R)
• M75: 57,618,218 km (0.054 R)
• M76: 58,167,542 km (0.094 R)
• M77: 62,173,773 km (0.113 R)
• M78: 64,437,637 km (0.097 R)
• M79: 66,383,008 km (0.107 R)
• M80: 68,115,501 km (0.112 R)
• M81: 68,929,164 km (0.118 R)
• M82: 69,979,790 km (0.117 R)
• M83: 70,214,060 km (0.079 R)
• M84: 71,742,800 km (0.111 R)
• M85: 71,860,983 km (0.09 R)
• M86: 72,452,194 km (0.111 R)
• M87: 72,689,157 km (0.093 R)
• M88: 72,926,269 km (0.038 R)
• M89: 73,877,712 km (0.136 R)

Kuiper Belt

Range: 30 - 59 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 443 - 13,908 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit