🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.3 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.6 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 392.7

Radius: 10.3

Gravity: 3.7 G

Time & Orbit

Eccentricity (e): 0.148

Orbit Range: 0.51 AU - 0.69 AU

Year: 315 Days

Day: 7.3 Hours

Environment

Temp: -152 °C

Axial Tilt: 32.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (34)

Outer Limit: 53,737,945 km

• M1: 129,851 km (0.117 R)
• M2: 203,902 km (0.086 R)
• M3: 278,102 km (0.12 R)
• M4: 381,175 km (0.096 R)
• M5: 474,674 km (0.106 R)
• M6: 552,315 km (0.108 R)
• M7: 664,663 km (0.1 R)
• M8: 785,389 km (0.087 R)
• M9: 850,464 km (0.065 R)
• M10: 924,365 km (0.071 R)
• M11: 1,018,163 km (0.091 R)
• M12: 1,137,542 km (0.062 R)
• M13: 1,269,637 km (0.115 R)
• M14: 1,347,428 km (0.051 R)
• M15: 1,414,897 km (0.103 R)
• M16: 1,495,829 km (0.091 R)
• M17: 1,582,446 km (0.102 R)
• M18: 1,717,982 km (0.051 R)
• M19: 1,809,087 km (0.067 R)
• M20: 1,915,302 km (0.12 R)
• M21: 2,000,872 km (0.098 R)
• M22: 2,096,913 km (0.059 R)
• M23: 2,222,875 km (0.06 R)
• M24: 2,380,252 km (0.063 R)
• M25: 2,526,558 km (0.092 R)
• M26: 2,600,759 km (0.07 R)
• M27: 2,706,076 km (0.083 R)
• M28: 2,853,879 km (0.074 R)
• M29: 3,088,598 km (0.091 R)
• M30: 3,248,518 km (0.09 R)
• M31: 3,362,212 km (0.089 R)
• M32: 3,444,192 km (0.059 R)
• M33: 3,705,539 km (0.077 R)
• M34: 3,881,616 km (0.093 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.91 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 299.7

Radius: 11.8

Gravity: 2.15 G

Time & Orbit

Eccentricity (e): 0.145

Orbit Range: 0.78 AU - 1.04 AU

Year: 589 Days

Day: 12 Hours

Environment

Temp: -165 °C

Axial Tilt: 18.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (38)

Outer Limit: 53,737,945 km

• M1: 146,905 km (0.066 R)
• M2: 229,483 km (0.091 R)
• M3: 313,707 km (0.082 R)
• M4: 461,210 km (0.088 R)
• M5: 549,323 km (0.086 R)
• M6: 681,119 km (0.063 R)
• M7: 877,990 km (0.071 R)
• M8: 996,920 km (0.104 R)
• M9: 1,242,410 km (0.119 R)
• M10: 1,333,665 km (0.115 R)
• M11: 1,427,313 km (0.115 R)
• M12: 1,523,206 km (0.099 R)
• M13: 1,647,671 km (0.094 R)
• M14: 1,797,418 km (0.064 R)
• M15: 1,874,013 km (0.088 R)
• M16: 2,042,011 km (0.1 R)
• M17: 2,156,753 km (0.119 R)
• M18: 2,291,690 km (0.088 R)
• M19: 2,471,806 km (0.04 R)
• M20: 2,600,759 km (0.082 R)
• M21: 2,706,973 km (0.117 R)
• M22: 3,007,964 km (0.107 R)
• M23: 3,442,247 km (0.081 R)
• M24: 3,524,526 km (0.074 R)
• M25: 3,614,584 km (0.112 R)
• M26: 3,726,483 km (0.089 R)
• M27: 3,875,034 km (0.104 R)
• M28: 3,996,806 km (0.075 R)
• M29: 4,119,925 km (0.099 R)
• M30: 4,244,241 km (0.084 R)
• M31: 4,347,613 km (0.104 R)
• M32: 4,421,963 km (0.104 R)
• M33: 4,556,901 km (0.048 R)
• M34: 4,662,666 km (0.077 R)
• M35: 4,807,776 km (0.104 R)
• M36: 4,931,045 km (0.082 R)
• M37: 5,071,069 km (0.088 R)
• M38: 5,291,576 km (0.113 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.06 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 381.9

Radius: 12.5

Gravity: 2.44 G

Time & Orbit

Eccentricity (e): 0.121

Orbit Range: 0.93 AU - 1.19 AU

Year: 740 Days

Day: 12.2 Hours

Environment

Temp: -186 °C

Axial Tilt: 34.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (44)

Outer Limit: 53,737,945 km

• M1: 156,031 km (0.116 R)
• M2: 236,065 km (0.085 R)
• M3: 333,005 km (0.054 R)
• M4: 430,991 km (0.109 R)
• M5: 558,449 km (0.072 R)
• M6: 700,866 km (0.107 R)
• M7: 805,136 km (0.086 R)
• M8: 920,177 km (0.072 R)
• M9: 1,020,706 km (0.093 R)
• M10: 1,357,601 km (0.061 R)
• M11: 1,485,656 km (0.038 R)
• M12: 1,630,168 km (0.041 R)
• M13: 1,710,652 km (0.045 R)
• M14: 2,059,364 km (0.075 R)
• M15: 2,388,480 km (0.118 R)
• M16: 2,473,302 km (0.095 R)
• M17: 2,573,831 km (0.119 R)
• M18: 2,697,698 km (0.118 R)
• M19: 2,846,099 km (0.115 R)
• M20: 2,928,827 km (0.106 R)
• M21: 3,035,490 km (0.116 R)
• M22: 3,143,350 km (0.117 R)
• M23: 3,410,831 km (0.046 R)
• M24: 3,579,727 km (0.071 R)
• M25: 3,710,476 km (0.113 R)
• M26: 3,817,738 km (0.107 R)
• M27: 3,901,064 km (0.112 R)
• M28: 4,240,352 km (0.1 R)
• M29: 4,678,225 km (0.102 R)
• M30: 4,767,535 km (0.061 R)
• M31: 4,929,699 km (0.059 R)
• M32: 5,011,529 km (0.117 R)
• M33: 5,149,009 km (0.077 R)
• M34: 5,287,686 km (0.036 R)
• M35: 5,446,260 km (0.105 R)
• M36: 5,559,206 km (0.108 R)
• M37: 5,663,476 km (0.107 R)
• M38: 5,922,131 km (0.097 R)
• M39: 6,283,111 km (0.114 R)
• M40: 6,401,592 km (0.119 R)
• M41: 6,601,006 km (0.094 R)
• M42: 6,691,363 km (0.112 R)
• M43: 6,812,537 km (0.11 R)
• M44: 6,914,114 km (0.108 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 478.3

Radius: 14.6

Gravity: 2.24 G

Time & Orbit

Eccentricity (e): 0.227

Orbit Range: 3.51 AU - 5.57 AU

Year: 6561 Days

Day: 13.6 Hours

Environment

Temp: -215 °C

Axial Tilt: 153.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 53,737,945 km

• M1: 240,254 km (0.102 R)
• M2: 476,170 km (0.091 R)
• M3: 824,284 km (0.111 R)
• M4: 1,161,029 km (0.061 R)
• M5: 1,298,958 km (0.108 R)
• M6: 1,678,039 km (0.113 R)
• M7: 1,853,966 km (0.105 R)
• M8: 2,321,460 km (0.11 R)
• M9: 2,722,083 km (0.067 R)
• M10: 2,846,698 km (0.082 R)
• M11: 3,037,136 km (0.091 R)
• M12: 3,453,616 km (0.113 R)
• M13: 4,053,354 km (0.1 R)
• M14: 4,463,252 km (0.077 R)
• M15: 5,665,571 km (0.076 R)
• M16: 6,427,622 km (0.079 R)
• M17: 6,764,068 km (0.067 R)
• M18: 6,991,756 km (0.112 R)
• M19: 7,689,929 km (0.117 R)
• M20: 7,957,560 km (0.102 R)
• M21: 8,197,963 km (0.116 R)
• M22: 8,871,752 km (0.043 R)
• M23: 8,996,218 km (0.078 R)
• M24: 9,723,114 km (0.063 R)
• M25: 9,819,305 km (0.113 R)
• M26: 9,980,422 km (0.084 R)
• M27: 10,799,021 km (0.105 R)
• M28: 11,199,645 km (0.108 R)
• M29: 11,334,283 km (0.096 R)
• M30: 12,430,835 km (0.091 R)
• M31: 12,535,254 km (0.064 R)
• M32: 14,430,360 km (0.074 R)
• M33: 14,760,971 km (0.06 R)
• M34: 14,871,674 km (0.073 R)
• M35: 15,094,126 km (0.111 R)
• M36: 15,242,976 km (0.111 R)
• M37: 15,767,915 km (0.088 R)
• M38: 17,339,291 km (0.088 R)
• M39: 17,456,276 km (0.107 R)
• M40: 17,730,040 km (0.094 R)
• M41: 17,965,956 km (0.091 R)
• M42: 18,163,425 km (0.078 R)
• M43: 18,361,493 km (0.093 R)
• M44: 18,799,815 km (0.113 R)
• M45: 19,890,533 km (0.116 R)
• M46: 20,381,962 km (0.12 R)
• M47: 20,711,676 km (0.066 R)
• M48: 21,251,425 km (0.102 R)
• M49: 21,460,263 km (0.05 R)
• M50: 21,964,109 km (0.08 R)
• M51: 22,387,172 km (0.092 R)
• M52: 22,855,563 km (0.086 R)
• M53: 23,026,553 km (0.093 R)
• M54: 23,370,179 km (0.049 R)
• M55: 23,542,516 km (0.054 R)
• M56: 24,367,249 km (0.07 R)
• M57: 24,542,129 km (0.099 R)
• M58: 24,761,290 km (0.105 R)
• M59: 25,113,144 km (0.105 R)
• M60: 25,911,249 km (0.104 R)
• M61: 26,223,759 km (0.064 R)
• M62: 26,943,025 km (0.091 R)
• M63: 27,169,068 km (0.115 R)
• M64: 28,677,164 km (0.098 R)
• M65: 31,345,391 km (0.045 R)
• M66: 31,869,283 km (0.099 R)

Planet 5 - Gas Giant

Semi-Major Axis: 5.28 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 565.5

Radius: 8.2

Gravity: 8.41 G

Time & Orbit

Eccentricity (e): 0.002

Orbit Range: 5.27 AU - 5.29 AU

Year: 8229 Days

Day: 10.9 Hours

Environment

Temp: -219 °C

Axial Tilt: 38.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 53,737,945 km

• M1: 135,536 km (0.114 R)
• M2: 327,470 km (0.109 R)
• M3: 568,921 km (0.056 R)
• M4: 784,940 km (0.074 R)
• M5: 894,745 km (0.103 R)
• M6: 1,237,025 km (0.058 R)
• M7: 1,637,947 km (0.086 R)
• M8: 2,670,023 km (0.119 R)
• M9: 2,838,171 km (0.059 R)
• M10: 3,493,260 km (0.045 R)
• M11: 3,651,086 km (0.117 R)
• M12: 3,811,155 km (0.059 R)
• M13: 3,892,088 km (0.09 R)
• M14: 4,138,326 km (0.058 R)
• M15: 4,417,924 km (0.097 R)
• M16: 4,474,622 km (0.113 R)
• M17: 5,535,570 km (0.106 R)
• M18: 5,719,725 km (0.104 R)
• M19: 5,874,708 km (0.108 R)
• M20: 6,316,321 km (0.079 R)
• M21: 6,573,480 km (0.032 R)
• M22: 6,998,637 km (0.04 R)
• M23: 7,164,541 km (0.12 R)
• M24: 7,568,007 km (0.111 R)
• M25: 7,772,507 km (0.106 R)
• M26: 8,013,509 km (0.11 R)
• M27: 8,117,480 km (0.084 R)
• M28: 8,573,454 km (0.096 R)
• M29: 9,218,520 km (0.082 R)
• M30: 9,291,225 km (0.045 R)
• M31: 9,620,489 km (0.118 R)
• M32: 9,694,092 km (0.095 R)
• M33: 9,805,093 km (0.07 R)
• M34: 10,028,144 km (0.056 R)
• M35: 10,215,291 km (0.115 R)
• M36: 10,975,397 km (0.11 R)
• M37: 11,951,224 km (0.088 R)
• M38: 12,751,573 km (0.088 R)
• M39: 13,117,489 km (0.101 R)
• M40: 13,734,880 km (0.119 R)
• M41: 13,859,495 km (0.08 R)
• M42: 14,109,922 km (0.116 R)
• M43: 14,319,807 km (0.114 R)
• M44: 15,126,439 km (0.094 R)
• M45: 15,255,093 km (0.091 R)
• M46: 16,385,904 km (0.095 R)
• M47: 17,318,796 km (0.093 R)
• M48: 17,498,463 km (0.102 R)
• M49: 17,769,085 km (0.095 R)
• M50: 18,177,637 km (0.091 R)
• M51: 19,375,318 km (0.109 R)
• M52: 19,515,192 km (0.088 R)
• M53: 19,608,541 km (0.094 R)
• M54: 20,788,719 km (0.116 R)
• M55: 20,979,605 km (0.069 R)
• M56: 21,171,091 km (0.092 R)
• M57: 21,267,132 km (0.109 R)
• M58: 21,894,546 km (0.095 R)
• M59: 22,626,080 km (0.082 R)
• M60: 22,773,433 km (0.084 R)
• M61: 23,019,522 km (0.092 R)
• M62: 23,167,624 km (0.114 R)
• M63: 23,316,025 km (0.079 R)
• M64: 24,363,958 km (0.108 R)
• M65: 24,716,710 km (0.12 R)
• M66: 25,478,163 km (0.072 R)
• M67: 26,299,006 km (0.085 R)
• M68: 26,816,316 km (0.086 R)
• M69: 26,868,226 km (0.101 R)
• M70: 27,389,425 km (0.047 R)
• M71: 27,546,354 km (0.069 R)
• M72: 28,600,420 km (0.029 R)
• M73: 28,866,106 km (0.105 R)
• M74: 30,260,358 km (0.11 R)
• M75: 30,802,351 km (0.066 R)
• M76: 31,347,635 km (0.074 R)
• M77: 34,065,380 km (0.114 R)
• M78: 34,629,214 km (0.088 R)
• M79: 35,253,037 km (0.075 R)
• M80: 35,880,600 km (0.085 R)
• M81: 36,973,114 km (0.083 R)
• M82: 38,779,209 km (0.076 R)
• M83: 38,955,435 km (0.098 R)

Planet 6 - Ice Giant

Semi-Major Axis: 7.02 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 177.7

Radius: 3.3

Gravity: 16.32 G

Time & Orbit

Eccentricity (e): 0.007

Orbit Range: 6.97 AU - 7.07 AU

Year: 12615 Days

Day: 15.1 Hours

Environment

Temp: -224 °C

Axial Tilt: 34 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 53,737,945 km

• M1: 61,934 km (0.099 R)
• M2: 87,964 km (0.106 R)
• M3: 226,342 km (0.051 R)
• M4: 463,753 km (0.082 R)
• M5: 565,031 km (0.114 R)
• M6: 701,315 km (0.089 R)
• M7: 1,616,555 km (0.051 R)
• M8: 1,789,789 km (0.039 R)
• M9: 2,408,825 km (0.084 R)
• M10: 2,562,013 km (0.085 R)
• M11: 3,063,764 km (0.061 R)
• M12: 3,744,883 km (0.104 R)
• M13: 3,820,580 km (0.096 R)
• M14: 4,285,081 km (0.039 R)
• M15: 4,390,847 km (0.056 R)
• M16: 4,550,917 km (0.065 R)
• M17: 4,631,700 km (0.108 R)
• M18: 4,849,365 km (0.103 R)
• M19: 4,931,943 km (0.106 R)
• M20: 5,266,593 km (0.047 R)
• M21: 5,351,415 km (0.089 R)
• M22: 5,695,191 km (0.091 R)
• M23: 5,811,279 km (0.103 R)
• M24: 5,957,735 km (0.106 R)
• M25: 6,283,859 km (0.044 R)
• M26: 6,434,055 km (0.081 R)
• M27: 6,585,448 km (0.097 R)
• M28: 6,615,816 km (0.088 R)
• M29: 6,707,370 km (0.062 R)
• M30: 6,768,556 km (0.077 R)
• M31: 7,171,273 km (0.113 R)
• M32: 7,391,332 km (0.119 R)
• M33: 7,870,194 km (0.113 R)
• M34: 8,032,059 km (0.115 R)
• M35: 8,195,121 km (0.076 R)
• M36: 8,690,440 km (0.111 R)
• M37: 9,779,362 km (0.117 R)
• M38: 9,988,351 km (0.108 R)
• M39: 10,339,756 km (0.113 R)
• M40: 10,481,575 km (0.048 R)
• M41: 10,588,238 km (0.09 R)
• M42: 10,659,596 km (0.113 R)
• M43: 11,859,670 km (0.049 R)
• M44: 11,896,771 km (0.048 R)
• M45: 12,419,166 km (0.058 R)
• M46: 12,569,811 km (0.095 R)
• M47: 12,645,358 km (0.03 R)
• M48: 13,063,634 km (0.088 R)
• M49: 13,255,119 km (0.118 R)
• M50: 13,370,609 km (0.107 R)
• M51: 13,524,994 km (0.118 R)
• M52: 13,602,336 km (0.114 R)
• M53: 13,757,619 km (0.079 R)
• M54: 13,991,739 km (0.106 R)
• M55: 15,261,825 km (0.116 R)
• M56: 15,788,410 km (0.099 R)
• M57: 16,033,301 km (0.094 R)
• M58: 16,320,679 km (0.112 R)
• M59: 16,361,968 km (0.104 R)
• M60: 16,485,685 km (0.104 R)
• M61: 16,692,729 km (0.106 R)
• M62: 18,037,913 km (0.039 R)
• M63: 18,637,352 km (0.06 R)
• M64: 18,809,838 km (0.073 R)
• M65: 19,592,384 km (0.04 R)
• M66: 19,680,049 km (0.09 R)
• M67: 20,164,147 km (0.112 R)
• M68: 20,208,428 km (0.041 R)
• M69: 21,234,071 km (0.101 R)
• M70: 21,957,527 km (0.086 R)
• M71: 23,011,593 km (0.111 R)
• M72: 23,661,297 km (0.095 R)
• M73: 23,801,320 km (0.085 R)
• M74: 24,363,958 km (0.069 R)
• M75: 24,788,966 km (0.095 R)
• M76: 25,073,501 km (0.082 R)
• M77: 25,311,661 km (0.088 R)
• M78: 25,789,925 km (0.09 R)
• M79: 26,174,691 km (0.069 R)
• M80: 27,389,276 km (0.093 R)
• M81: 27,683,535 km (0.11 R)
• M82: 27,831,038 km (0.102 R)
• M83: 29,120,422 km (0.101 R)
• M84: 30,581,395 km (0.117 R)
• M85: 30,835,712 km (0.116 R)
• M86: 31,346,289 km (0.075 R)
• M87: 32,324,360 km (0.071 R)
• M88: 32,583,314 km (0.072 R)
• M89: 32,843,016 km (0.091 R)
• M90: 32,999,196 km (0.102 R)
• M91: 34,099,189 km (0.105 R)
• M92: 34,521,504 km (0.03 R)

Planet 7 - Ice Giant

Semi-Major Axis: 9.29 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 261.7

Radius: 3.9

Gravity: 17.21 G

Time & Orbit

Eccentricity (e): 0.101

Orbit Range: 8.35 AU - 10.23 AU

Year: 19205 Days

Day: 20.4 Hours

Environment

Temp: -224 °C

Axial Tilt: 23.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 53,737,945 km

• M1: 86,916 km (0.092 R)
• M2: 248,183 km (0.085 R)
• M3: 430,543 km (0.111 R)
• M4: 1,286,242 km (0.099 R)
• M5: 1,746,256 km (0.039 R)
• M6: 1,797,568 km (0.042 R)
• M7: 1,875,209 km (0.101 R)
• M8: 2,711,611 km (0.047 R)
• M9: 3,261,682 km (0.077 R)
• M10: 3,811,754 km (0.082 R)
• M11: 4,114,540 km (0.082 R)
• M12: 4,217,164 km (0.086 R)
• M13: 5,932,154 km (0.117 R)
• M14: 7,414,220 km (0.12 R)
• M15: 8,260,346 km (0.089 R)
• M16: 8,826,574 km (0.116 R)
• M17: 9,360,189 km (0.111 R)
• M18: 10,087,983 km (0.051 R)
• M19: 10,226,510 km (0.113 R)
• M20: 10,272,736 km (0.101 R)
• M21: 11,693,766 km (0.046 R)
• M22: 11,936,564 km (0.065 R)
• M23: 12,377,728 km (0.077 R)
• M24: 12,874,243 km (0.08 R)
• M25: 13,478,469 km (0.078 R)
• M26: 13,580,046 km (0.081 R)
• M27: 13,989,046 km (0.1 R)
• M28: 14,402,086 km (0.084 R)
• M29: 14,871,524 km (0.096 R)
• M30: 17,903,125 km (0.118 R)
• M31: 19,718,047 km (0.073 R)
• M32: 19,833,387 km (0.094 R)
• M33: 20,471,870 km (0.105 R)
• M34: 20,530,213 km (0.091 R)
• M35: 20,881,768 km (0.067 R)
• M36: 21,117,086 km (0.11 R)
• M37: 21,294,210 km (0.088 R)
• M38: 22,487,702 km (0.077 R)
• M39: 23,153,262 km (0.085 R)
• M40: 24,009,710 km (0.092 R)
• M41: 26,640,538 km (0.107 R)
• M42: 26,767,996 km (0.086 R)
• M43: 26,895,752 km (0.095 R)
• M44: 27,151,864 km (0.031 R)
• M45: 27,795,584 km (0.042 R)
• M46: 28,379,314 km (0.12 R)
• M47: 29,889,206 km (0.088 R)
• M48: 31,762,321 km (0.074 R)
• M49: 34,433,690 km (0.109 R)
• M50: 34,990,643 km (0.044 R)
• M51: 35,761,072 km (0.068 R)
• M52: 36,324,906 km (0.084 R)
• M53: 37,176,268 km (0.103 R)
• M54: 38,321,589 km (0.099 R)
• M55: 38,609,714 km (0.072 R)
• M56: 39,696,543 km (0.104 R)
• M57: 40,793,395 km (0.068 R)
• M58: 43,391,311 km (0.085 R)
• M59: 43,992,695 km (0.1 R)
• M60: 45,279,536 km (0.086 R)
• M61: 45,965,741 km (0.094 R)
• M62: 46,578,643 km (0.078 R)
• M63: 46,655,537 km (0.082 R)
• M64: 50,233,768 km (0.101 R)
• M65: 50,785,934 km (0.084 R)

Kuiper Belt

Range: 30 - 45 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 514 - 17,706 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit