🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.55 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.97

Radius: 0.99

Gravity: 0.99 G

Time & Orbit

Eccentricity (e): 0.083

Orbit Range: 0.5 AU - 0.6 AU

Year: 150 Days

Day: 22.7 Hours

Environment

Temp: 215 °C

Axial Tilt: 13.8 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 1.06 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.13

Radius: 1.05

Gravity: 1.02 G

Time & Orbit

Eccentricity (e): 0.171

Orbit Range: 0.88 AU - 1.24 AU

Year: 401 Days

Day: 28.7 Hours

Environment

Temp: 28 °C

Axial Tilt: 4.7 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Satellites (2)

Outer Limit: 42,778,759 km

• M1: 234,869 km (0.048 R)
• M2: 424,409 km (0.089 R)

Planet 3 - Terrestrial

Semi-Major Axis: 1.1 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.08

Radius: 1.57

Gravity: 1.25 G

Time & Orbit

Eccentricity (e): 0.195

Orbit Range: 0.89 AU - 1.31 AU

Year: 424 Days

Day: 15.7 Hours

Environment

Temp: 15 °C

Axial Tilt: 25.2 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Satellites (1)

Outer Limit: 42,778,759 km

• M1: 456,722 km (0.085 R)

Planet 4 - Terrestrial

Semi-Major Axis: 1.1 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.29

Radius: 0.61

Gravity: 0.78 G

Time & Orbit

Eccentricity (e): 0.222

Orbit Range: 0.86 AU - 1.34 AU

Year: 424 Days

Day: 47.9 Hours

Environment

Temp: 13 °C

Axial Tilt: 41.2 °

Atmosphere: N₂, O₂

Biome: Oceanic/Continental

Planet 5 - Terrestrial

Semi-Major Axis: 4.49 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.26

Radius: 1.6

Gravity: 1.27 G

Time & Orbit

Eccentricity (e): 0.161

Orbit Range: 3.77 AU - 5.21 AU

Year: 3493 Days

Day: 15.9 Hours

Environment

Temp: -143 °C

Axial Tilt: 31.8 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 4.84 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 6 - Gas Giant

Semi-Major Axis: 5.19 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 216

Radius: 8.7

Gravity: 2.85 G

Time & Orbit

Eccentricity (e): 0.162

Orbit Range: 4.35 AU - 6.03 AU

Year: 4340 Days

Day: 6.7 Hours

Environment

Temp: -143 °C

Axial Tilt: 11 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (79)

Outer Limit: 42,778,759 km

• M1: 108,758 km (0.069 R)
• M2: 224,696 km (0.079 R)
• M3: 354,547 km (0.104 R)
• M4: 528,978 km (0.043 R)
• M5: 585,376 km (0.106 R)
• M6: 644,019 km (0.088 R)
• M7: 786,586 km (0.118 R)
• M8: 842,834 km (0.093 R)
• M9: 1,030,580 km (0.117 R)
• M10: 1,156,242 km (0.115 R)
• M11: 1,309,430 km (0.102 R)
• M12: 1,388,567 km (0.116 R)
• M13: 1,528,142 km (0.108 R)
• M14: 1,808,937 km (0.057 R)
• M15: 2,079,560 km (0.087 R)
• M16: 2,159,296 km (0.097 R)
• M17: 2,308,146 km (0.104 R)
• M18: 2,804,362 km (0.04 R)
• M19: 2,877,964 km (0.062 R)
• M20: 3,027,113 km (0.084 R)
• M21: 3,537,391 km (0.079 R)
• M22: 3,762,087 km (0.036 R)
• M23: 3,958,360 km (0.116 R)
• M24: 4,141,318 km (0.1 R)
• M25: 4,242,296 km (0.038 R)
• M26: 4,344,173 km (0.083 R)
• M27: 4,706,798 km (0.086 R)
• M28: 5,079,297 km (0.06 R)
• M29: 5,278,262 km (0.083 R)
• M30: 5,442,969 km (0.098 R)
• M31: 5,516,721 km (0.028 R)
• M32: 5,740,070 km (0.075 R)
• M33: 5,985,261 km (0.065 R)
• M34: 6,272,489 km (0.119 R)
• M35: 6,349,981 km (0.107 R)
• M36: 6,408,174 km (0.117 R)
• M37: 6,860,708 km (0.041 R)
• M38: 7,121,008 km (0.053 R)
• M39: 7,262,528 km (0.099 R)
• M40: 7,343,759 km (0.081 R)
• M41: 7,425,440 km (0.062 R)
• M42: 8,364,167 km (0.068 R)
• M43: 8,642,269 km (0.086 R)
• M44: 8,750,129 km (0.091 R)
• M45: 8,901,821 km (0.083 R)
• M46: 9,098,094 km (0.063 R)
• M47: 9,718,027 km (0.104 R)
• M48: 9,830,076 km (0.049 R)
• M49: 10,055,670 km (0.076 R)
• M50: 10,169,065 km (0.081 R)
• M51: 10,351,425 km (0.117 R)
• M52: 10,488,905 km (0.087 R)
• M53: 10,603,946 km (0.03 R)
• M54: 11,326,653 km (0.098 R)
• M55: 11,944,941 km (0.097 R)
• M56: 12,016,898 km (0.102 R)
• M57: 12,355,139 km (0.104 R)
• M58: 12,549,765 km (0.071 R)
• M59: 12,671,987 km (0.092 R)
• M60: 12,868,259 km (0.097 R)
• M61: 13,040,895 km (0.052 R)
• M62: 13,413,244 km (0.061 R)
• M63: 13,513,176 km (0.11 R)
• M64: 13,814,466 km (0.059 R)
• M65: 13,915,295 km (0.11 R)
• M66: 14,143,282 km (0.11 R)
• M67: 14,296,021 km (0.084 R)
• M68: 14,937,796 km (0.092 R)
• M69: 15,458,247 km (0.088 R)
• M70: 15,746,821 km (0.119 R)
• M71: 15,931,575 km (0.119 R)
• M72: 16,010,862 km (0.118 R)
• M73: 16,731,026 km (0.099 R)
• M74: 17,352,904 km (0.102 R)
• M75: 17,789,880 km (0.114 R)
• M76: 17,954,736 km (0.105 R)
• M77: 18,092,366 km (0.067 R)
• M78: 18,230,595 km (0.087 R)
• M79: 18,479,975 km (0.119 R)

Planet 7 - Gas Giant

Semi-Major Axis: 5.3 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 76.9

Radius: 11.9

Gravity: 0.54 G

Time & Orbit

Eccentricity (e): 0.113

Orbit Range: 4.7 AU - 5.9 AU

Year: 4479 Days

Day: 5.7 Hours

Environment

Temp: -148 °C

Axial Tilt: 43.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (63)

Outer Limit: 42,778,759 km

• M1: 150,196 km (0.115 R)
• M2: 247,136 km (0.074 R)
• M3: 395,986 km (0.115 R)
• M4: 629,807 km (0.068 R)
• M5: 775,515 km (0.114 R)
• M6: 910,303 km (0.105 R)
• M7: 1,004,849 km (0.108 R)
• M8: 1,086,380 km (0.031 R)
• M9: 1,196,035 km (0.054 R)
• M10: 1,283,101 km (0.063 R)
• M11: 1,454,839 km (0.061 R)
• M12: 1,596,060 km (0.091 R)
• M13: 1,673,252 km (0.061 R)
• M14: 1,831,527 km (0.096 R)
• M15: 1,984,715 km (0.104 R)
• M16: 2,152,863 km (0.107 R)
• M17: 2,228,111 km (0.072 R)
• M18: 2,425,430 km (0.075 R)
• M19: 2,662,992 km (0.089 R)
• M20: 2,767,261 km (0.102 R)
• M21: 3,003,776 km (0.062 R)
• M22: 3,471,718 km (0.09 R)
• M23: 3,586,011 km (0.096 R)
• M24: 3,688,635 km (0.103 R)
• M25: 3,844,366 km (0.093 R)
• M26: 3,975,863 km (0.053 R)
• M27: 4,135,783 km (0.099 R)
• M28: 4,740,158 km (0.096 R)
• M29: 4,895,740 km (0.087 R)
• M30: 5,052,967 km (0.107 R)
• M31: 5,139,435 km (0.113 R)
• M32: 5,490,242 km (0.112 R)
• M33: 5,788,690 km (0.058 R)
• M34: 5,864,087 km (0.118 R)
• M35: 6,107,782 km (0.091 R)
• M36: 6,246,309 km (0.086 R)
• M37: 6,339,210 km (0.091 R)
• M38: 6,573,630 km (0.066 R)
• M39: 6,842,756 km (0.118 R)
• M40: 7,018,982 km (0.102 R)
• M41: 7,147,936 km (0.078 R)
• M42: 7,294,093 km (0.065 R)
• M43: 7,638,916 km (0.101 R)
• M44: 7,905,200 km (0.108 R)
• M45: 8,090,103 km (0.037 R)
• M46: 8,361,623 km (0.114 R)
• M47: 8,791,867 km (0.071 R)
• M48: 9,477,624 km (0.108 R)
• M49: 9,638,292 km (0.082 R)
• M50: 10,290,090 km (0.051 R)
• M51: 10,473,796 km (0.091 R)
• M52: 10,658,549 km (0.115 R)
• M53: 10,751,300 km (0.112 R)
• M54: 10,974,949 km (0.082 R)
• M55: 11,087,446 km (0.07 R)
• M56: 11,162,694 km (0.076 R)
• M57: 12,174,873 km (0.112 R)
• M58: 12,369,201 km (0.057 R)
• M59: 12,564,576 km (0.08 R)
• M60: 12,760,848 km (0.067 R)
• M61: 13,077,098 km (0.116 R)
• M62: 13,156,684 km (0.054 R)
• M63: 13,516,317 km (0.05 R)

Planet 8 - Gas Giant

Semi-Major Axis: 6.79 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 237.9

Radius: 12.5

Gravity: 1.52 G

Time & Orbit

Eccentricity (e): 0.024

Orbit Range: 6.63 AU - 6.95 AU

Year: 6495 Days

Day: 14 Hours

Environment

Temp: -164 °C

Axial Tilt: 12.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 42,778,759 km

• M1: 167,101 km (0.096 R)
• M2: 334,202 km (0.08 R)
• M3: 453,282 km (0.107 R)
• M4: 681,568 km (0.097 R)
• M5: 1,022,202 km (0.072 R)
• M6: 1,109,418 km (0.093 R)
• M7: 1,319,004 km (0.09 R)
• M8: 1,527,693 km (0.088 R)
• M9: 1,702,873 km (0.104 R)
• M10: 1,900,192 km (0.098 R)
• M11: 2,202,529 km (0.086 R)
• M12: 2,606,892 km (0.083 R)
• M13: 2,764,569 km (0.104 R)
• M14: 3,163,696 km (0.076 R)
• M15: 3,294,594 km (0.108 R)
• M16: 3,389,289 km (0.073 R)
• M17: 3,757,300 km (0.107 R)
• M18: 3,836,587 km (0.038 R)
• M19: 3,956,265 km (0.109 R)
• M20: 4,323,378 km (0.099 R)
• M21: 5,068,525 km (0.109 R)
• M22: 5,200,321 km (0.08 R)
• M23: 5,355,454 km (0.102 R)
• M24: 5,534,822 km (0.114 R)
• M25: 5,670,657 km (0.088 R)
• M26: 5,968,656 km (0.072 R)
• M27: 6,061,407 km (0.083 R)
• M28: 6,652,169 km (0.099 R)
• M29: 6,966,773 km (0.092 R)
• M30: 7,138,062 km (0.104 R)
• M31: 7,939,458 km (0.095 R)
• M32: 8,350,852 km (0.108 R)
• M33: 8,559,242 km (0.049 R)
• M34: 8,875,043 km (0.12 R)
• M35: 10,038,017 km (0.056 R)
• M36: 10,259,572 km (0.068 R)
• M37: 10,510,896 km (0.032 R)
• M38: 10,595,120 km (0.07 R)
• M39: 10,792,589 km (0.101 R)
• M40: 10,962,831 km (0.091 R)
• M41: 11,277,136 km (0.066 R)
• M42: 11,623,455 km (0.076 R)
• M43: 11,856,379 km (0.083 R)
• M44: 12,326,715 km (0.08 R)
• M45: 12,564,127 km (0.066 R)
• M46: 12,833,104 km (0.048 R)
• M47: 12,983,450 km (0.092 R)
• M48: 13,376,892 km (0.069 R)
• M49: 13,590,368 km (0.105 R)
• M50: 13,897,343 km (0.108 R)
• M51: 14,020,761 km (0.099 R)
• M52: 14,144,479 km (0.077 R)
• M53: 14,330,878 km (0.109 R)
• M54: 14,706,069 km (0.084 R)
• M55: 14,989,707 km (0.08 R)
• M56: 15,402,447 km (0.114 R)
• M57: 15,594,232 km (0.064 R)
• M58: 16,271,760 km (0.111 R)
• M59: 16,467,135 km (0.048 R)
• M60: 16,696,020 km (0.092 R)
• M61: 16,893,040 km (0.105 R)
• M62: 16,991,925 km (0.093 R)
• M63: 17,322,685 km (0.103 R)
• M64: 17,990,640 km (0.063 R)
• M65: 18,463,220 km (0.036 R)
• M66: 19,489,611 km (0.109 R)
• M67: 19,835,930 km (0.072 R)
• M68: 20,044,619 km (0.101 R)
• M69: 20,219,199 km (0.109 R)
• M70: 20,887,004 km (0.115 R)
• M71: 21,205,797 km (0.109 R)
• M72: 21,740,759 km (0.087 R)
• M73: 22,063,891 km (0.11 R)
• M74: 22,497,276 km (0.079 R)
• M75: 22,933,503 km (0.11 R)
• M76: 23,079,511 km (0.117 R)
• M77: 23,519,328 km (0.031 R)
• M78: 24,481,991 km (0.106 R)
• M79: 24,705,939 km (0.111 R)
• M80: 25,080,831 km (0.087 R)

Planet 9 - Gas Giant

Semi-Major Axis: 8.4 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 264.2

Radius: 14.4

Gravity: 1.27 G

Time & Orbit

Eccentricity (e): 0

Orbit Range: 8.4 AU - 8.4 AU

Year: 8937 Days

Day: 6.4 Hours

Environment

Temp: -167 °C

Axial Tilt: 28.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 42,778,759 km

• M1: 238,160 km (0.09 R)
• M2: 354,846 km (0.065 R)
• M3: 724,951 km (0.052 R)
• M4: 840,291 km (0.116 R)
• M5: 1,048,232 km (0.063 R)
• M6: 1,197,082 km (0.107 R)
• M7: 1,434,644 km (0.114 R)
• M8: 1,601,894 km (0.096 R)
• M9: 1,758,224 km (0.077 R)
• M10: 1,865,485 km (0.096 R)
• M11: 2,162,736 km (0.118 R)
• M12: 2,475,546 km (0.077 R)
• M13: 3,015,444 km (0.111 R)
• M14: 3,366,102 km (0.073 R)
• M15: 4,011,617 km (0.115 R)
• M16: 4,130,996 km (0.102 R)
• M17: 4,324,575 km (0.077 R)
• M18: 4,422,562 km (0.061 R)
• M19: 4,796,407 km (0.1 R)
• M20: 5,051,471 km (0.112 R)
• M21: 5,575,064 km (0.08 R)
• M22: 5,843,592 km (0.064 R)
• M23: 6,449,164 km (0.067 R)
• M24: 6,646,185 km (0.038 R)
• M25: 7,017,337 km (0.101 R)
• M26: 7,190,870 km (0.084 R)
• M27: 7,929,585 km (0.065 R)
• M28: 8,879,382 km (0.114 R)
• M29: 9,479,269 km (0.072 R)
• M30: 9,735,680 km (0.092 R)
• M31: 9,864,932 km (0.109 R)
• M32: 10,453,151 km (0.059 R)
• M33: 10,952,060 km (0.034 R)
• M34: 11,458,898 km (0.049 R)
• M35: 11,801,028 km (0.093 R)
• M36: 12,425,450 km (0.045 R)
• M37: 12,600,778 km (0.119 R)
• M38: 12,777,005 km (0.066 R)
• M39: 12,953,979 km (0.098 R)
• M40: 13,561,945 km (0.06 R)
• M41: 13,706,307 km (0.062 R)
• M42: 14,033,178 km (0.099 R)
• M43: 14,215,837 km (0.057 R)
• M44: 14,731,650 km (0.105 R)
• M45: 15,857,524 km (0.104 R)
• M46: 16,662,061 km (0.043 R)
• M47: 16,816,895 km (0.092 R)
• M48: 17,323,134 km (0.06 R)
• M49: 17,479,913 km (0.099 R)
• M50: 19,316,975 km (0.044 R)
• M51: 19,847,299 km (0.106 R)
• M52: 19,970,418 km (0.039 R)
• M53: 20,093,687 km (0.101 R)
• M54: 20,465,138 km (0.06 R)
• M55: 21,382,772 km (0.082 R)
• M56: 22,058,505 km (0.067 R)
• M57: 22,398,990 km (0.062 R)
• M58: 23,214,747 km (0.077 R)
• M59: 24,478,550 km (0.087 R)
• M60: 24,654,627 km (0.115 R)
• M61: 24,787,021 km (0.095 R)
• M62: 25,229,830 km (0.108 R)
• M63: 25,586,023 km (0.09 R)
• M64: 27,209,459 km (0.041 R)
• M65: 27,666,181 km (0.063 R)
• M66: 27,941,591 km (0.104 R)
• M67: 28,448,728 km (0.076 R)
• M68: 28,587,555 km (0.114 R)
• M69: 28,958,857 km (0.048 R)
• M70: 29,285,130 km (0.091 R)
• M71: 29,518,951 km (0.118 R)
• M72: 29,847,318 km (0.087 R)
• M73: 30,602,339 km (0.043 R)
• M74: 30,887,024 km (0.077 R)
• M75: 32,035,038 km (0.115 R)

Planet 10 - Gas Giant

Semi-Major Axis: 8.5 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 588.4

Radius: 8.3

Gravity: 8.54 G

Time & Orbit

Eccentricity (e): 0.088

Orbit Range: 7.75 AU - 9.25 AU

Year: 9097 Days

Day: 5.1 Hours

Environment

Temp: -159 °C

Axial Tilt: 23.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (87)

Outer Limit: 42,778,759 km

• M1: 113,994 km (0.045 R)
• M2: 324,927 km (0.079 R)
• M3: 594,801 km (0.026 R)
• M4: 794,215 km (0.075 R)
• M5: 893,548 km (0.07 R)
• M6: 1,142,180 km (0.106 R)
• M7: 1,432,549 km (0.107 R)
• M8: 1,576,014 km (0.061 R)
• M9: 1,811,032 km (0.03 R)
• M10: 2,011,942 km (0.098 R)
• M11: 2,290,942 km (0.105 R)
• M12: 2,410,919 km (0.08 R)
• M13: 2,632,175 km (0.094 R)
• M14: 3,094,432 km (0.105 R)
• M15: 3,308,058 km (0.109 R)
• M16: 4,210,133 km (0.089 R)
• M17: 4,387,257 km (0.095 R)
• M18: 5,089,469 km (0.081 R)
• M19: 5,152,151 km (0.112 R)
• M20: 5,469,747 km (0.069 R)
• M21: 5,760,864 km (0.091 R)
• M22: 6,698,993 km (0.099 R)
• M23: 7,045,461 km (0.087 R)
• M24: 7,397,914 km (0.108 R)
• M25: 8,046,570 km (0.082 R)
• M26: 8,119,873 km (0.073 R)
• M27: 8,788,725 km (0.05 R)
• M28: 9,206,103 km (0.059 R)
• M29: 9,981,768 km (0.061 R)
• M30: 10,377,305 km (0.084 R)
• M31: 10,697,594 km (0.102 R)
• M32: 10,778,078 km (0.115 R)
• M33: 11,802,225 km (0.101 R)
• M34: 12,094,539 km (0.058 R)
• M35: 12,558,592 km (0.092 R)
• M36: 13,114,647 km (0.087 R)
• M37: 13,244,199 km (0.09 R)
• M38: 13,330,666 km (0.063 R)
• M39: 14,074,018 km (0.093 R)
• M40: 14,562,006 km (0.073 R)
• M41: 15,191,365 km (0.069 R)
• M42: 15,509,260 km (0.083 R)
• M43: 15,737,696 km (0.096 R)
• M44: 16,336,985 km (0.104 R)
• M45: 16,896,631 km (0.095 R)
• M46: 17,084,675 km (0.111 R)
• M47: 17,368,014 km (0.084 R)
• M48: 17,843,585 km (0.095 R)
• M49: 17,939,178 km (0.104 R)
• M50: 18,758,975 km (0.045 R)
• M51: 19,394,167 km (0.093 R)
• M52: 20,085,908 km (0.062 R)
• M53: 20,235,206 km (0.029 R)
• M54: 20,635,231 km (0.044 R)
• M55: 20,785,876 km (0.039 R)
• M56: 21,392,196 km (0.091 R)
• M57: 22,106,975 km (0.099 R)
• M58: 23,141,444 km (0.06 R)
• M59: 23,402,493 km (0.109 R)
• M60: 24,350,644 km (0.054 R)
• M61: 24,882,763 km (0.046 R)
• M62: 25,150,244 km (0.083 R)
• M63: 25,364,917 km (0.107 R)
• M64: 25,850,213 km (0.075 R)
• M65: 25,958,522 km (0.07 R)
• M66: 27,821,763 km (0.084 R)
• M67: 28,769,615 km (0.094 R)
• M68: 29,614,544 km (0.112 R)
• M69: 29,671,242 km (0.118 R)
• M70: 29,727,790 km (0.096 R)
• M71: 31,560,064 km (0.102 R)
• M72: 33,192,925 km (0.099 R)
• M73: 33,546,425 km (0.11 R)
• M74: 34,913,001 km (0.096 R)
• M75: 35,272,336 km (0.11 R)
• M76: 35,934,605 km (0.103 R)
• M77: 36,418,854 km (0.047 R)
• M78: 36,600,914 km (0.076 R)
• M79: 37,577,489 km (0.064 R)
• M80: 37,822,979 km (0.063 R)
• M81: 38,007,433 km (0.088 R)
• M82: 39,868,281 km (0.111 R)
• M83: 39,930,813 km (0.09 R)
• M84: 40,809,850 km (0.068 R)
• M85: 41,631,741 km (0.101 R)
• M86: 41,758,600 km (0.115 R)
• M87: 42,650,802 km (0.034 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: 507 - 10,953 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit