🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.41 AU

Composition

Type: Inner System (Rocky)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Terrestrial

Semi-Major Axis: 0.82 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.28

Radius: 0.6

Gravity: 0.78 G

Time & Orbit

Eccentricity (e): 0.248

Orbit Range: 0.62 AU - 1.02 AU

Year: 267 Days

Day: 18.4 Hours

Environment

Temp: 106 °C

Axial Tilt: 11.1 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (2)

Outer Limit: 107,920,018 km

• M1: 92,302 km (0.084 R)
• M2: 141,669 km (0.092 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1.08 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.99

Radius: 1.74

Gravity: 1.32 G

Time & Orbit

Eccentricity (e): 0.149

Orbit Range: 0.92 AU - 1.24 AU

Year: 404 Days

Day: 39.7 Hours

Environment

Temp: 22 °C

Axial Tilt: 29.8 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Planet 3 - Terrestrial

Semi-Major Axis: 2.13 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.62

Radius: 1.47

Gravity: 1.21 G

Time & Orbit

Eccentricity (e): 0.129

Orbit Range: 1.86 AU - 2.4 AU

Year: 1119 Days

Day: 36 Hours

Environment

Temp: -65 °C

Axial Tilt: 44.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 107,920,018 km

• M1: 67,169 km (0.079 R)

Planet 4 - Terrestrial

Semi-Major Axis: 3.29 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.55

Radius: 1.19

Gravity: 1.09 G

Time & Orbit

Eccentricity (e): 0.116

Orbit Range: 2.91 AU - 3.67 AU

Year: 2148 Days

Day: 30.5 Hours

Environment

Temp: -108 °C

Axial Tilt: 14.6 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 107,920,018 km

• M1: 1,578,108 km (0.042 R)

Planet 5 - Gas Giant

Semi-Major Axis: 5.76 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 71.8

Radius: 10

Gravity: 0.72 G

Time & Orbit

Eccentricity (e): 0.037

Orbit Range: 5.55 AU - 5.97 AU

Year: 4975 Days

Day: 7.6 Hours

Environment

Temp: -140 °C

Axial Tilt: 44.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (41)

Outer Limit: 107,920,018 km

• M1: 127,906 km (0.075 R)
• M2: 806,632 km (0.12 R)
• M3: 885,021 km (0.076 R)
• M4: 1,067,082 km (0.042 R)
• M5: 1,335,610 km (0.102 R)
• M6: 1,536,370 km (0.111 R)
• M7: 1,645,577 km (0.114 R)
• M8: 1,716,486 km (0.118 R)
• M9: 1,956,890 km (0.069 R)
• M10: 2,141,793 km (0.087 R)
• M11: 2,366,638 km (0.059 R)
• M12: 2,516,984 km (0.059 R)
• M13: 2,646,686 km (0.111 R)
• M14: 3,251,510 km (0.105 R)
• M15: 3,722,893 km (0.084 R)
• M16: 3,830,453 km (0.071 R)
• M17: 4,187,693 km (0.071 R)
• M18: 4,257,555 km (0.102 R)
• M19: 4,714,577 km (0.062 R)
• M20: 4,904,566 km (0.104 R)
• M21: 5,232,186 km (0.108 R)
• M22: 5,520,760 km (0.072 R)
• M23: 6,018,771 km (0.066 R)
• M24: 6,694,206 km (0.079 R)
• M25: 6,875,069 km (0.07 R)
• M26: 7,410,480 km (0.094 R)
• M27: 7,478,398 km (0.083 R)
• M28: 7,614,831 km (0.094 R)
• M29: 8,098,630 km (0.065 R)
• M30: 9,023,744 km (0.119 R)
• M31: 9,278,509 km (0.1 R)
• M32: 10,057,016 km (0.047 R)
• M33: 11,127,538 km (0.114 R)
• M34: 11,303,017 km (0.107 R)
• M35: 11,459,795 km (0.052 R)
• M36: 11,597,425 km (0.117 R)
• M37: 12,254,160 km (0.106 R)
• M38: 12,516,106 km (0.106 R)
• M39: 12,718,961 km (0.074 R)
• M40: 13,644,971 km (0.069 R)
• M41: 14,042,603 km (0.054 R)

Planet 6 - Gas Giant

Semi-Major Axis: 6.09 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 101.5

Radius: 13.6

Gravity: 0.55 G

Time & Orbit

Eccentricity (e): 0.084

Orbit Range: 5.58 AU - 6.6 AU

Year: 5409 Days

Day: 7 Hours

Environment

Temp: -143 °C

Axial Tilt: 12.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (33)

Outer Limit: 107,920,018 km

• M1: 196,721 km (0.055 R)
• M2: 414,087 km (0.114 R)
• M3: 626,665 km (0.119 R)
• M4: 959,521 km (0.111 R)
• M5: 1,420,881 km (0.118 R)
• M6: 2,455,948 km (0.025 R)
• M7: 2,812,739 km (0.079 R)
• M8: 4,354,495 km (0.112 R)
• M9: 4,657,730 km (0.102 R)
• M10: 4,885,717 km (0.051 R)
• M11: 6,673,711 km (0.104 R)
• M12: 6,986,819 km (0.093 R)
• M13: 7,229,467 km (0.099 R)
• M14: 7,474,957 km (0.088 R)
• M15: 7,646,546 km (0.073 R)
• M16: 7,954,867 km (0.114 R)
• M17: 9,228,842 km (0.112 R)
• M18: 10,204,669 km (0.082 R)
• M19: 10,758,630 km (0.085 R)
• M20: 10,952,659 km (0.056 R)
• M21: 11,585,757 km (0.102 R)
• M22: 11,674,019 km (0.08 R)
• M23: 11,873,433 km (0.061 R)
• M24: 12,208,383 km (0.097 R)
• M25: 12,682,608 km (0.082 R)
• M26: 12,979,111 km (0.102 R)
• M27: 13,301,046 km (0.081 R)
• M28: 13,906,020 km (0.107 R)
• M29: 14,639,049 km (0.096 R)
• M30: 15,263,620 km (0.113 R)
• M31: 15,627,891 km (0.112 R)
• M32: 15,750,113 km (0.105 R)
• M33: 16,813,005 km (0.12 R)

Planet 7 - Gas Giant

Semi-Major Axis: 7.75 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 32.1

Radius: 10.4

Gravity: 0.3 G

Time & Orbit

Eccentricity (e): 0.1

Orbit Range: 6.98 AU - 8.53 AU

Year: 7765 Days

Day: 13.2 Hours

Environment

Temp: -169 °C

Axial Tilt: 3.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (51)

Outer Limit: 107,920,018 km

• M1: 137,780 km (0.099 R)
• M2: 249,529 km (0.076 R)
• M3: 363,672 km (0.105 R)
• M4: 579,991 km (0.106 R)
• M5: 708,346 km (0.042 R)
• M6: 815,458 km (0.048 R)
• M7: 895,493 km (0.067 R)
• M8: 986,748 km (0.1 R)
• M9: 1,064,090 km (0.087 R)
• M10: 1,404,126 km (0.084 R)
• M11: 1,501,963 km (0.072 R)
• M12: 1,581,848 km (0.112 R)
• M13: 1,673,701 km (0.065 R)
• M14: 1,767,200 km (0.107 R)
• M15: 1,841,251 km (0.05 R)
• M16: 2,204,624 km (0.11 R)
• M17: 2,566,651 km (0.115 R)
• M18: 2,884,845 km (0.03 R)
• M19: 3,099,817 km (0.087 R)
• M20: 3,189,875 km (0.068 R)
• M21: 3,425,642 km (0.031 R)
• M22: 3,844,964 km (0.094 R)
• M23: 4,081,927 km (0.1 R)
• M24: 4,309,316 km (0.025 R)
• M25: 4,643,668 km (0.034 R)
• M26: 5,260,460 km (0.106 R)
• M27: 6,144,433 km (0.102 R)
• M28: 6,803,861 km (0.106 R)
• M29: 6,972,158 km (0.1 R)
• M30: 7,107,993 km (0.089 R)
• M31: 7,485,728 km (0.043 R)
• M32: 7,747,075 km (0.12 R)
• M33: 7,940,655 km (0.083 R)
• M34: 8,171,634 km (0.086 R)
• M35: 8,296,848 km (0.117 R)
• M36: 8,603,673 km (0.047 R)
• M37: 8,694,628 km (0.054 R)
• M38: 9,024,641 km (0.119 R)
• M39: 9,247,093 km (0.058 R)
• M40: 10,020,514 km (0.116 R)
• M41: 10,231,597 km (0.091 R)
• M42: 10,913,015 km (0.09 R)
• M43: 11,568,852 km (0.075 R)
• M44: 12,360,374 km (0.114 R)
• M45: 13,064,681 km (0.08 R)
• M46: 13,485,051 km (0.108 R)
• M47: 13,697,031 km (0.094 R)
• M48: 13,846,031 km (0.084 R)
• M49: 13,974,087 km (0.116 R)
• M50: 14,210,003 km (0.112 R)
• M51: 14,533,882 km (0.057 R)

Planet 8 - Gas Giant

Semi-Major Axis: 7.78 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 718.6

Radius: 15

Gravity: 3.19 G

Time & Orbit

Eccentricity (e): 0.094

Orbit Range: 7.05 AU - 8.51 AU

Year: 7810 Days

Day: 10.7 Hours

Environment

Temp: -152 °C

Axial Tilt: 28.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 107,920,018 km

• M1: 233,971 km (0.099 R)
• M2: 503,247 km (0.118 R)
• M3: 702,512 km (0.117 R)
• M4: 899,682 km (0.099 R)
• M5: 1,082,191 km (0.088 R)
• M6: 1,259,913 km (0.029 R)
• M7: 1,409,511 km (0.102 R)
• M8: 1,874,461 km (0.097 R)
• M9: 2,294,383 km (0.106 R)
• M10: 2,575,327 km (0.092 R)
• M11: 2,842,808 km (0.049 R)
• M12: 2,942,441 km (0.036 R)
• M13: 3,119,564 km (0.102 R)
• M14: 3,379,117 km (0.077 R)
• M15: 3,700,004 km (0.098 R)
• M16: 3,864,263 km (0.114 R)
• M17: 4,143,412 km (0.119 R)
• M18: 4,487,487 km (0.115 R)
• M19: 5,326,283 km (0.113 R)
• M20: 5,450,150 km (0.088 R)
• M21: 5,700,726 km (0.112 R)
• M22: 5,923,178 km (0.12 R)
• M23: 6,051,533 km (0.078 R)
• M24: 6,442,582 km (0.096 R)
• M25: 6,841,709 km (0.116 R)
• M26: 7,386,694 km (0.064 R)
• M27: 7,490,515 km (0.106 R)
• M28: 8,016,651 km (0.118 R)
• M29: 8,700,463 km (0.099 R)
• M30: 8,810,118 km (0.072 R)
• M31: 9,067,875 km (0.112 R)
• M32: 10,549,492 km (0.118 R)
• M33: 10,745,017 km (0.108 R)
• M34: 11,820,925 km (0.036 R)
• M35: 12,392,388 km (0.084 R)
• M36: 12,806,176 km (0.109 R)
• M37: 12,931,090 km (0.112 R)
• M38: 13,182,415 km (0.098 R)
• M39: 13,519,908 km (0.045 R)
• M40: 15,338,569 km (0.109 R)
• M41: 16,006,673 km (0.108 R)
• M42: 16,457,411 km (0.091 R)
• M43: 16,775,456 km (0.045 R)
• M44: 17,049,520 km (0.094 R)
• M45: 17,695,184 km (0.074 R)
• M46: 18,161,182 km (0.075 R)
• M47: 19,010,299 km (0.074 R)
• M48: 19,296,181 km (0.075 R)
• M49: 19,439,795 km (0.057 R)
• M50: 19,872,432 km (0.088 R)
• M51: 20,308,210 km (0.065 R)
• M52: 22,133,155 km (0.105 R)
• M53: 22,233,236 km (0.106 R)
• M54: 24,422,451 km (0.117 R)
• M55: 25,097,885 km (0.064 R)
• M56: 25,568,969 km (0.065 R)
• M57: 25,674,136 km (0.12 R)
• M58: 26,413,898 km (0.06 R)
• M59: 27,644,490 km (0.093 R)
• M60: 27,860,359 km (0.117 R)
• M61: 28,239,590 km (0.11 R)
• M62: 28,402,652 km (0.095 R)
• M63: 28,838,879 km (0.095 R)
• M64: 30,829,728 km (0.096 R)
• M65: 31,109,775 km (0.075 R)
• M66: 31,503,217 km (0.053 R)
• M67: 31,616,014 km (0.114 R)
• M68: 33,725,494 km (0.091 R)
• M69: 34,013,918 km (0.094 R)
• M70: 34,477,372 km (0.116 R)
• M71: 35,001,115 km (0.104 R)
• M72: 35,117,951 km (0.053 R)
• M73: 35,293,279 km (0.041 R)
• M74: 35,997,736 km (0.036 R)
• M75: 36,470,016 km (0.119 R)
• M76: 37,063,172 km (0.046 R)
• M77: 38,259,207 km (0.088 R)
• M78: 39,225,010 km (0.042 R)
• M79: 40,260,078 km (0.087 R)

Planet 9 - Ice Giant

Semi-Major Axis: 12.92 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 32.4

Radius: 3.5

Gravity: 2.64 G

Time & Orbit

Eccentricity (e): 0.047

Orbit Range: 12.31 AU - 13.53 AU

Year: 16713 Days

Day: 24.9 Hours

Environment

Temp: -192 °C

Axial Tilt: 22.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 107,920,018 km

• M1: 79,586 km (0.025 R)
• M2: 145,708 km (0.095 R)
• M3: 383,868 km (0.088 R)
• M4: 466,147 km (0.104 R)
• M5: 701,464 km (0.116 R)
• M6: 734,675 km (0.079 R)
• M7: 768,335 km (0.114 R)
• M8: 849,118 km (0.075 R)
• M9: 884,572 km (0.097 R)
• M10: 908,508 km (0.065 R)
• M11: 1,031,328 km (0.084 R)
• M12: 1,056,610 km (0.066 R)
• M13: 1,375,253 km (0.095 R)
• M14: 1,501,963 km (0.12 R)
• M15: 1,647,222 km (0.033 R)
• M16: 1,951,355 km (0.098 R)
• M17: 2,077,765 km (0.073 R)
• M18: 2,141,942 km (0.092 R)
• M19: 2,206,868 km (0.101 R)
• M20: 2,239,630 km (0.112 R)
• M21: 2,372,024 km (0.095 R)
• M22: 2,422,289 km (0.052 R)
• M23: 2,575,327 km (0.102 R)
• M24: 2,855,225 km (0.079 R)
• M25: 3,500,590 km (0.104 R)
• M26: 3,712,421 km (0.093 R)
• M27: 4,454,875 km (0.102 R)
• M28: 4,496,314 km (0.044 R)
• M29: 4,832,310 km (0.094 R)
• M30: 4,960,366 km (0.039 R)
• M31: 5,176,386 km (0.099 R)
• M32: 5,307,433 km (0.098 R)
• M33: 5,639,840 km (0.112 R)
• M34: 6,093,420 km (0.037 R)
• M35: 6,208,611 km (0.088 R)
• M36: 6,371,224 km (0.084 R)
• M37: 6,795,633 km (0.098 R)
• M38: 6,963,033 km (0.12 R)
• M39: 7,820,827 km (0.086 R)
• M40: 7,895,925 km (0.038 R)
• M41: 8,173,130 km (0.105 R)
• M42: 8,376,882 km (0.106 R)
• M43: 8,453,626 km (0.082 R)
• M44: 8,530,669 km (0.047 R)
• M45: 8,867,264 km (0.118 R)
• M46: 8,919,324 km (0.077 R)
• M47: 9,821,549 km (0.089 R)
• M48: 9,956,636 km (0.081 R)
• M49: 10,038,017 km (0.063 R)
• M50: 10,475,740 km (0.066 R)
• M51: 10,696,846 km (0.088 R)
• M52: 10,807,997 km (0.109 R)
• M53: 10,863,797 km (0.104 R)
• M54: 11,031,497 km (0.119 R)
• M55: 11,115,720 km (0.083 R)
• M56: 11,596,977 km (0.066 R)
• M57: 12,027,070 km (0.069 R)
• M58: 12,638,028 km (0.093 R)
• M59: 12,785,083 km (0.085 R)
• M60: 13,110,309 km (0.098 R)
• M61: 13,348,618 km (0.113 R)
• M62: 14,011,337 km (0.104 R)
• M63: 14,072,073 km (0.065 R)
• M64: 14,684,677 km (0.056 R)
• M65: 15,651,079 km (0.086 R)
• M66: 15,840,619 km (0.107 R)
• M67: 16,030,758 km (0.09 R)
• M68: 16,638,126 km (0.084 R)
• M69: 17,383,273 km (0.104 R)
• M70: 18,006,946 km (0.092 R)
• M71: 20,229,821 km (0.042 R)
• M72: 20,470,673 km (0.088 R)
• M73: 20,505,081 km (0.034 R)
• M74: 20,920,365 km (0.025 R)
• M75: 21,443,209 km (0.096 R)
• M76: 21,688,699 km (0.061 R)
• M77: 21,829,471 km (0.098 R)
• M78: 21,935,087 km (0.071 R)
• M79: 22,147,067 km (0.051 R)
• M80: 22,751,443 km (0.069 R)
• M81: 24,267,318 km (0.118 R)

Planet 10 - Ice Giant

Semi-Major Axis: 19.49 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 815.3

Radius: 7.4

Gravity: 14.89 G

Time & Orbit

Eccentricity (e): 0.14

Orbit Range: 16.76 AU - 22.22 AU

Year: 30966 Days

Day: 20.4 Hours

Environment

Temp: -204 °C

Axial Tilt: 18 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 107,920,018 km

• M1: 169,195 km (0.09 R)
• M2: 518,207 km (0.034 R)
• M3: 2,131,919 km (0.059 R)
• M4: 2,306,799 km (0.089 R)
• M5: 2,577,721 km (0.107 R)
• M6: 2,623,947 km (0.111 R)
• M7: 2,858,965 km (0.09 R)
• M8: 3,199,599 km (0.1 R)
• M9: 3,604,710 km (0.117 R)
• M10: 3,708,531 km (0.083 R)
• M11: 4,407,303 km (0.102 R)
• M12: 5,619,794 km (0.118 R)
• M13: 5,679,932 km (0.092 R)
• M14: 6,799,822 km (0.107 R)
• M15: 7,783,727 km (0.104 R)
• M16: 7,985,834 km (0.089 R)
• M17: 8,258,102 km (0.077 R)
• M18: 8,326,617 km (0.104 R)
• M19: 8,464,248 km (0.064 R)
• M20: 9,022,248 km (0.077 R)
• M21: 9,234,527 km (0.057 R)
• M22: 9,954,242 km (0.114 R)
• M23: 10,247,155 km (0.106 R)
• M24: 10,841,507 km (0.113 R)
• M25: 11,831,097 km (0.061 R)
• M26: 12,063,572 km (0.086 R)
• M27: 12,141,363 km (0.073 R)
• M28: 15,135,864 km (0.054 R)
• M29: 17,193,433 km (0.115 R)
• M30: 17,456,725 km (0.11 R)
• M31: 18,793,382 km (0.112 R)
• M32: 19,337,170 km (0.111 R)
• M33: 19,519,530 km (0.099 R)
• M34: 20,533,056 km (0.079 R)
• M35: 21,093,001 km (0.109 R)
• M36: 22,610,821 km (0.086 R)
• M37: 23,577,223 km (0.087 R)
• M38: 24,458,504 km (0.1 R)
• M39: 25,250,924 km (0.103 R)
• M40: 25,550,120 km (0.111 R)
• M41: 25,750,281 km (0.065 R)
• M42: 26,051,572 km (0.04 R)
• M43: 26,455,187 km (0.106 R)
• M44: 26,860,746 km (0.037 R)
• M45: 27,064,349 km (0.097 R)
• M46: 28,711,123 km (0.054 R)
• M47: 28,919,363 km (0.11 R)
• M48: 30,073,062 km (0.078 R)
• M49: 30,921,431 km (0.037 R)
• M50: 34,503,851 km (0.117 R)
• M51: 34,614,404 km (0.107 R)
• M52: 35,280,414 km (0.107 R)
• M53: 36,175,009 km (0.078 R)
• M54: 36,399,855 km (0.106 R)
• M55: 37,758,353 km (0.105 R)
• M56: 40,175,705 km (0.077 R)
• M57: 42,761,205 km (0.115 R)
• M58: 43,356,305 km (0.119 R)
• M59: 44,434,457 km (0.064 R)
• M60: 47,229,394 km (0.094 R)
• M61: 47,598,153 km (0.103 R)
• M62: 47,967,809 km (0.032 R)
• M63: 49,580,773 km (0.083 R)
• M64: 49,830,602 km (0.108 R)
• M65: 57,383,200 km (0.093 R)
• M66: 58,302,629 km (0.071 R)
• M67: 58,962,355 km (0.066 R)
• M68: 60,155,997 km (0.083 R)
• M69: 63,107,563 km (0.082 R)
• M70: 63,649,256 km (0.098 R)
• M71: 63,784,792 km (0.113 R)
• M72: 65,557,228 km (0.082 R)
• M73: 66,655,874 km (0.117 R)
• M74: 67,483,899 km (0.057 R)
• M75: 71,815,954 km (0.119 R)
• M76: 72,239,914 km (0.082 R)
• M77: 72,948,410 km (0.113 R)
• M78: 75,374,438 km (0.116 R)
• M79: 76,381,082 km (0.075 R)
• M80: 79,427,643 km (0.084 R)
• M81: 79,719,808 km (0.054 R)
• M82: 81,039,111 km (0.088 R)
• M83: 81,333,370 km (0.094 R)
• M84: 84,443,510 km (0.058 R)
• M85: 86,238,236 km (0.051 R)
• M86: 88,953,736 km (0.074 R)
• M87: 94,932,864 km (0.113 R)
• M88: 95,708,828 km (0.094 R)
• M89: 97,110,710 km (0.099 R)
• M90: 98,049,137 km (0.116 R)
• M91: 101,198,621 km (0.115 R)
• M92: 104,381,316 km (0.043 R)
• M93: 105,663,519 km (0.038 R)
• M94: 106,950,959 km (0.068 R)
• M95: 107,112,375 km (0.09 R)
• M96: 107,435,207 km (0.045 R)

Kuiper Belt

Range: 30.5 - 47.5 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 180 - 12,677 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit