🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.77 AU

Composition

Type: Far Outer (Icy/Cometary)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.53 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 336.4

Radius: 9.9

Gravity: 3.43 G

Time & Orbit

Eccentricity (e): 0.221

Orbit Range: 1.19 AU - 1.87 AU

Year: 1284 Days

Day: 10.3 Hours

Environment

Temp: -199 °C

Axial Tilt: 16 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 55,338,485 km

• M1: 190,737 km (0.088 R)
• M2: 255,812 km (0.066 R)
• M3: 388,206 km (0.108 R)
• M4: 455,675 km (0.05 R)
• M5: 691,591 km (0.104 R)
• M6: 830,567 km (0.104 R)
• M7: 922,271 km (0.098 R)
• M8: 998,416 km (0.12 R)
• M9: 1,247,048 km (0.104 R)
• M10: 1,441,076 km (0.03 R)
• M11: 1,802,654 km (0.076 R)
• M12: 1,899,444 km (0.057 R)
• M13: 2,123,991 km (0.075 R)
• M14: 2,278,525 km (0.081 R)
• M15: 2,526,409 km (0.091 R)
• M16: 3,048,356 km (0.108 R)
• M17: 3,331,844 km (0.098 R)
• M18: 3,522,132 km (0.11 R)
• M19: 3,955,816 km (0.08 R)
• M20: 4,136,232 km (0.097 R)
• M21: 4,243,643 km (0.086 R)
• M22: 4,516,210 km (0.039 R)
• M23: 4,749,583 km (0.045 R)
• M24: 4,884,819 km (0.088 R)
• M25: 5,182,070 km (0.114 R)
• M26: 5,603,487 km (0.096 R)
• M27: 5,710,600 km (0.103 R)
• M28: 5,818,460 km (0.102 R)
• M29: 5,939,035 km (0.106 R)
• M30: 6,060,509 km (0.08 R)
• M31: 6,133,662 km (0.1 R)
• M32: 6,207,264 km (0.052 R)
• M33: 6,318,116 km (0.106 R)
• M34: 6,404,883 km (0.078 R)
• M35: 6,479,533 km (0.105 R)
• M36: 6,679,844 km (0.098 R)
• M37: 6,768,256 km (0.051 R)
• M38: 6,971,710 km (0.079 R)
• M39: 7,112,780 km (0.06 R)
• M40: 7,254,749 km (0.096 R)
• M41: 7,397,615 km (0.093 R)
• M42: 7,580,872 km (0.074 R)
• M43: 7,712,668 km (0.079 R)
• M44: 7,911,932 km (0.039 R)
• M45: 8,139,770 km (0.104 R)
• M46: 8,478,759 km (0.116 R)
• M47: 8,615,641 km (0.112 R)
• M48: 8,739,508 km (0.069 R)
• M49: 8,850,060 km (0.11 R)
• M50: 8,974,975 km (0.081 R)
• M51: 9,086,575 km (0.039 R)
• M52: 9,226,748 km (0.064 R)
• M53: 9,297,059 km (0.104 R)
• M54: 9,452,491 km (0.104 R)
• M55: 9,523,400 km (0.11 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.6 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 299

Radius: 8

Gravity: 4.67 G

Time & Orbit

Eccentricity (e): 0.025

Orbit Range: 1.56 AU - 1.64 AU

Year: 1373 Days

Day: 8.9 Hours

Environment

Temp: -189 °C

Axial Tilt: 28.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (46)

Outer Limit: 55,338,485 km

• M1: 99,782 km (0.105 R)
• M2: 170,392 km (0.089 R)
• M3: 247,285 km (0.085 R)
• M4: 328,517 km (0.084 R)
• M5: 517,609 km (0.053 R)
• M6: 590,463 km (0.098 R)
• M7: 706,551 km (0.045 R)
• M8: 1,190,350 km (0.049 R)
• M9: 1,339,799 km (0.113 R)
• M10: 1,518,269 km (0.101 R)
• M11: 1,625,979 km (0.099 R)
• M12: 2,082,402 km (0.106 R)
• M13: 2,167,972 km (0.092 R)
• M14: 2,422,887 km (0.119 R)
• M15: 2,476,742 km (0.076 R)
• M16: 2,743,326 km (0.058 R)
• M17: 2,827,998 km (0.119 R)
• M18: 3,028,758 km (0.086 R)
• M19: 3,214,559 km (0.111 R)
• M20: 3,313,892 km (0.099 R)
• M21: 3,414,272 km (0.096 R)
• M22: 3,546,218 km (0.114 R)
• M23: 3,607,702 km (0.058 R)
• M24: 3,762,985 km (0.08 R)
• M25: 3,962,997 km (0.084 R)
• M26: 4,144,759 km (0.089 R)
• M27: 4,583,380 km (0.062 R)
• M28: 4,774,416 km (0.085 R)
• M29: 4,910,849 km (0.102 R)
• M30: 5,351,116 km (0.115 R)
• M31: 5,528,539 km (0.102 R)
• M32: 5,612,015 km (0.12 R)
• M33: 5,683,821 km (0.115 R)
• M34: 5,768,045 km (0.092 R)
• M35: 6,084,445 km (0.108 R)
• M36: 6,306,897 km (0.084 R)
• M37: 7,002,976 km (0.052 R)
• M38: 7,301,274 km (0.114 R)
• M39: 7,406,142 km (0.079 R)
• M40: 7,897,122 km (0.096 R)
• M41: 8,316,594 km (0.102 R)
• M42: 8,646,308 km (0.093 R)
• M43: 8,812,811 km (0.106 R)
• M44: 8,910,498 km (0.106 R)
• M45: 9,022,397 km (0.107 R)
• M46: 9,290,327 km (0.109 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.49 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 614.7

Radius: 13.1

Gravity: 3.58 G

Time & Orbit

Eccentricity (e): 0.05

Orbit Range: 2.37 AU - 2.61 AU

Year: 2665 Days

Day: 13.8 Hours

Environment

Temp: -202 °C

Axial Tilt: 22.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (63)

Outer Limit: 55,338,485 km

• M1: 201,359 km (0.072 R)
• M2: 309,069 km (0.099 R)
• M3: 568,472 km (0.075 R)
• M4: 701,315 km (0.09 R)
• M5: 922,570 km (0.08 R)
• M6: 1,094,159 km (0.072 R)
• M7: 1,221,915 km (0.067 R)
• M8: 1,310,178 km (0.106 R)
• M9: 2,175,452 km (0.092 R)
• M10: 2,550,045 km (0.119 R)
• M11: 2,636,214 km (0.114 R)
• M12: 2,767,261 km (0.104 R)
• M13: 2,900,553 km (0.11 R)
• M14: 3,005,720 km (0.091 R)
• M15: 3,407,839 km (0.1 R)
• M16: 3,583,168 km (0.08 R)
• M17: 3,893,285 km (0.039 R)
• M18: 4,009,672 km (0.073 R)
• M19: 4,297,498 km (0.081 R)
• M20: 4,557,200 km (0.06 R)
• M21: 4,875,544 km (0.09 R)
• M22: 5,128,365 km (0.062 R)
• M23: 5,478,424 km (0.113 R)
• M24: 5,855,261 km (0.078 R)
• M25: 6,066,194 km (0.093 R)
• M26: 6,182,282 km (0.119 R)
• M27: 6,397,104 km (0.089 R)
• M28: 6,594,573 km (0.056 R)
• M29: 6,714,102 km (0.065 R)
• M30: 7,117,567 km (0.079 R)
• M31: 8,548,172 km (0.111 R)
• M32: 8,700,463 km (0.109 R)
• M33: 9,385,621 km (0.051 R)
• M34: 9,905,174 km (0.106 R)
• M35: 10,295,325 km (0.069 R)
• M36: 10,760,724 km (0.072 R)
• M37: 11,138,160 km (0.061 R)
• M38: 11,591,890 km (0.09 R)
• M39: 11,833,192 km (0.034 R)
• M40: 12,369,949 km (0.118 R)
• M41: 12,616,486 km (0.117 R)
• M42: 12,740,353 km (0.09 R)
• M43: 13,014,416 km (0.092 R)
• M44: 13,340,839 km (0.054 R)
• M45: 13,619,091 km (0.115 R)
• M46: 13,771,830 km (0.091 R)
• M47: 13,950,600 km (0.114 R)
• M48: 14,104,386 km (0.084 R)
• M49: 14,388,024 km (0.069 R)
• M50: 14,777,726 km (0.057 R)
• M51: 14,987,014 km (0.045 R)
• M52: 15,250,007 km (0.096 R)
• M53: 15,540,975 km (0.118 R)
• M54: 15,647,339 km (0.085 R)
• M55: 15,887,443 km (0.072 R)
• M56: 16,074,890 km (0.056 R)
• M57: 16,209,378 km (0.094 R)
• M58: 16,479,402 km (0.116 R)
• M59: 17,491,282 km (0.086 R)
• M60: 17,740,512 km (0.096 R)
• M61: 18,354,612 km (0.108 R)
• M62: 18,664,279 km (0.07 R)
• M63: 18,862,197 km (0.12 R)

Planet 4 - Gas Giant

Semi-Major Axis: 3.92 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 20.4

Radius: 13.5

Gravity: 0.11 G

Time & Orbit

Eccentricity (e): 0.042

Orbit Range: 3.76 AU - 4.08 AU

Year: 5264 Days

Day: 12 Hours

Environment

Temp: -215 °C

Axial Tilt: 29.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (30)

Outer Limit: 55,338,485 km

• M1: 168,746 km (0.089 R)
• M2: 424,858 km (0.101 R)
• M3: 534,214 km (0.107 R)
• M4: 794,215 km (0.054 R)
• M5: 1,057,807 km (0.078 R)
• M6: 1,294,022 km (0.092 R)
• M7: 1,525,599 km (0.06 R)
• M8: 2,223,922 km (0.12 R)
• M9: 2,441,736 km (0.088 R)
• M10: 2,870,484 km (0.101 R)
• M11: 3,050,749 km (0.084 R)
• M12: 3,382,857 km (0.095 R)
• M13: 3,634,630 km (0.074 R)
• M14: 3,799,038 km (0.102 R)
• M15: 4,146,105 km (0.099 R)
• M16: 4,285,680 km (0.102 R)
• M17: 4,503,494 km (0.052 R)
• M18: 4,780,998 km (0.072 R)
• M19: 4,995,671 km (0.094 R)
• M20: 5,098,595 km (0.11 R)
• M21: 5,718,678 km (0.065 R)
• M22: 7,248,615 km (0.089 R)
• M23: 7,430,526 km (0.066 R)
• M24: 7,759,193 km (0.113 R)
• M25: 7,905,200 km (0.037 R)
• M26: 7,998,699 km (0.111 R)
• M27: 8,403,511 km (0.036 R)
• M28: 8,718,414 km (0.119 R)
• M29: 9,051,120 km (0.082 R)
• M30: 9,331,616 km (0.106 R)

Planet 5 - Gas Giant

Semi-Major Axis: 5.04 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 182.6

Radius: 9.5

Gravity: 2.02 G

Time & Orbit

Eccentricity (e): 0.031

Orbit Range: 4.88 AU - 5.2 AU

Year: 7674 Days

Day: 8.6 Hours

Environment

Temp: -229 °C

Axial Tilt: 7.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 55,338,485 km

• M1: 136,583 km (0.059 R)
• M2: 258,655 km (0.09 R)
• M3: 450,140 km (0.072 R)
• M4: 534,962 km (0.089 R)
• M5: 594,801 km (0.046 R)
• M6: 668,104 km (0.11 R)
• M7: 778,657 km (0.117 R)
• M8: 919,877 km (0.118 R)
• M9: 1,095,954 km (0.107 R)
• M10: 1,242,111 km (0.094 R)
• M11: 1,423,424 km (0.111 R)
• M12: 1,554,023 km (0.116 R)
• M13: 1,719,328 km (0.075 R)
• M14: 2,116,660 km (0.072 R)
• M15: 2,182,932 km (0.1 R)
• M16: 2,334,624 km (0.115 R)
• M17: 3,050,450 km (0.052 R)
• M18: 3,316,286 km (0.101 R)
• M19: 3,393,777 km (0.111 R)
• M20: 3,709,279 km (0.106 R)
• M21: 4,137,877 km (0.109 R)
• M22: 4,284,333 km (0.113 R)
• M23: 4,475,220 km (0.045 R)
• M24: 4,625,566 km (0.083 R)
• M25: 4,755,716 km (0.101 R)
• M26: 5,086,627 km (0.109 R)
• M27: 5,176,236 km (0.076 R)
• M28: 6,363,145 km (0.111 R)
• M29: 6,654,263 km (0.062 R)
• M30: 7,024,518 km (0.097 R)
• M31: 7,452,068 km (0.07 R)
• M32: 8,148,596 km (0.115 R)
• M33: 8,227,284 km (0.112 R)
• M34: 8,785,285 km (0.082 R)
• M35: 9,055,309 km (0.117 R)
• M36: 9,658,787 km (0.042 R)
• M37: 9,742,113 km (0.111 R)
• M38: 9,937,487 km (0.119 R)
• M39: 10,502,818 km (0.047 R)
• M40: 10,847,042 km (0.061 R)
• M41: 11,576,182 km (0.079 R)
• M42: 11,694,215 km (0.119 R)
• M43: 12,653,586 km (0.1 R)
• M44: 12,714,473 km (0.098 R)
• M45: 12,836,395 km (0.12 R)
• M46: 12,928,098 km (0.082 R)
• M47: 13,050,619 km (0.048 R)
• M48: 13,513,774 km (0.082 R)
• M49: 14,045,146 km (0.038 R)
• M50: 14,234,387 km (0.119 R)
• M51: 14,329,232 km (0.1 R)
• M52: 14,615,263 km (0.051 R)
• M53: 16,106,455 km (0.067 R)
• M54: 16,304,522 km (0.044 R)
• M55: 16,669,691 km (0.093 R)
• M56: 16,769,772 km (0.078 R)
• M57: 17,037,701 km (0.051 R)
• M58: 17,239,509 km (0.057 R)
• M59: 18,501,517 km (0.078 R)
• M60: 18,917,249 km (0.12 R)
• M61: 19,126,237 km (0.114 R)
• M62: 19,335,974 km (0.072 R)
• M63: 19,546,607 km (0.062 R)
• M64: 19,616,918 km (0.096 R)
• M65: 20,182,847 km (0.106 R)
• M66: 20,503,435 km (0.111 R)
• M67: 20,610,697 km (0.077 R)
• M68: 21,330,562 km (0.083 R)
• M69: 21,439,170 km (0.097 R)
• M70: 21,766,341 km (0.114 R)
• M71: 22,095,157 km (0.107 R)
• M72: 22,425,768 km (0.066 R)
• M73: 22,499,370 km (0.088 R)
• M74: 22,573,122 km (0.092 R)
• M75: 22,943,077 km (0.108 R)
• M76: 23,314,978 km (0.062 R)
• M77: 23,876,568 km (0.107 R)
• M78: 24,404,798 km (0.119 R)
• M79: 24,936,918 km (0.096 R)
• M80: 25,626,714 km (0.102 R)

Planet 6 - Ice Giant

Semi-Major Axis: 7.49 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 287.6

Radius: 7.4

Gravity: 5.25 G

Time & Orbit

Eccentricity (e): 0.141

Orbit Range: 6.43 AU - 8.55 AU

Year: 13903 Days

Day: 22.2 Hours

Environment

Temp: -232 °C

Axial Tilt: 31.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 55,338,485 km

• M1: 173,982 km (0.093 R)
• M2: 257,907 km (0.058 R)
• M3: 396,734 km (0.069 R)
• M4: 448,943 km (0.114 R)
• M5: 503,846 km (0.091 R)
• M6: 865,872 km (0.073 R)
• M7: 1,610,122 km (0.101 R)
• M8: 1,809,386 km (0.1 R)
• M9: 2,305,154 km (0.037 R)
• M10: 2,974,454 km (0.091 R)
• M11: 3,414,571 km (0.102 R)
• M12: 4,294,207 km (0.101 R)
• M13: 4,540,146 km (0.116 R)
• M14: 4,727,592 km (0.105 R)
• M15: 4,790,722 km (0.07 R)
• M16: 5,837,459 km (0.11 R)
• M17: 5,973,144 km (0.118 R)
• M18: 6,351,776 km (0.049 R)
• M19: 6,456,495 km (0.109 R)
• M20: 6,773,792 km (0.05 R)
• M21: 7,132,228 km (0.088 R)
• M22: 8,588,863 km (0.067 R)
• M23: 9,055,010 km (0.091 R)
• M24: 9,410,155 km (0.101 R)
• M25: 9,489,741 km (0.106 R)
• M26: 11,379,760 km (0.043 R)
• M27: 11,592,040 km (0.074 R)
• M28: 11,719,946 km (0.116 R)
• M29: 11,848,451 km (0.1 R)
• M30: 13,471,288 km (0.11 R)
• M31: 13,605,926 km (0.105 R)
• M32: 14,148,817 km (0.032 R)
• M33: 14,239,922 km (0.11 R)
• M34: 14,468,807 km (0.096 R)
• M35: 15,489,962 km (0.032 R)
• M36: 17,210,487 km (0.105 R)
• M37: 17,552,019 km (0.083 R)
• M38: 17,797,359 km (0.119 R)
• M39: 19,091,381 km (0.072 R)
• M40: 19,444,881 km (0.072 R)
• M41: 19,546,308 km (0.096 R)
• M42: 19,597,171 km (0.108 R)
• M43: 20,828,811 km (0.048 R)
• M44: 20,880,721 km (0.107 R)
• M45: 20,984,542 km (0.077 R)
• M46: 21,297,052 km (0.107 R)
• M47: 21,453,980 km (0.107 R)
• M48: 21,558,848 km (0.065 R)
• M49: 22,936,645 km (0.081 R)
• M50: 23,907,086 km (0.075 R)
• M51: 24,946,043 km (0.094 R)
• M52: 25,166,700 km (0.119 R)
• M53: 26,279,409 km (0.112 R)
• M54: 27,921,096 km (0.091 R)
• M55: 28,494,804 km (0.095 R)
• M56: 28,667,739 km (0.113 R)
• M57: 29,362,771 km (0.045 R)
• M58: 30,651,407 km (0.11 R)
• M59: 34,197,475 km (0.114 R)
• M60: 35,552,532 km (0.095 R)
• M61: 37,428,490 km (0.093 R)
• M62: 37,617,881 km (0.051 R)
• M63: 38,315,007 km (0.05 R)
• M64: 38,952,294 km (0.079 R)
• M65: 39,208,256 km (0.044 R)
• M66: 39,528,993 km (0.087 R)
• M67: 39,593,171 km (0.027 R)
• M68: 40,561,069 km (0.06 R)
• M69: 41,145,548 km (0.063 R)
• M70: 43,776,675 km (0.04 R)
• M71: 44,710,465 km (0.055 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.97 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 452.6

Radius: 7.7

Gravity: 7.63 G

Time & Orbit

Eccentricity (e): 0.186

Orbit Range: 6.49 AU - 9.45 AU

Year: 15261 Days

Day: 17 Hours

Environment

Temp: -239 °C

Axial Tilt: 45.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 55,338,485 km

• M1: 442,062 km (0.115 R)
• M2: 676,781 km (0.109 R)
• M3: 827,875 km (0.076 R)
• M4: 1,162,974 km (0.086 R)
• M5: 1,230,442 km (0.078 R)
• M6: 1,562,550 km (0.083 R)
• M7: 1,868,926 km (0.052 R)
• M8: 2,420,942 km (0.084 R)
• M9: 3,798,290 km (0.096 R)
• M10: 3,865,759 km (0.07 R)
• M11: 4,070,857 km (0.077 R)
• M12: 4,209,534 km (0.098 R)
• M13: 4,707,097 km (0.069 R)
• M14: 4,852,656 km (0.096 R)
• M15: 5,336,156 km (0.083 R)
• M16: 5,412,002 km (0.068 R)
• M17: 6,348,934 km (0.119 R)
• M18: 7,717,305 km (0.086 R)
• M19: 7,803,025 km (0.04 R)
• M20: 8,633,892 km (0.077 R)
• M21: 10,520,620 km (0.062 R)
• M22: 11,387,689 km (0.07 R)
• M23: 12,077,934 km (0.079 R)
• M24: 13,343,980 km (0.114 R)
• M25: 13,395,442 km (0.085 R)
• M26: 15,726,925 km (0.106 R)
• M27: 16,716,216 km (0.093 R)
• M28: 17,162,466 km (0.045 R)
• M29: 17,725,702 km (0.119 R)
• M30: 20,571,951 km (0.117 R)
• M31: 21,834,557 km (0.058 R)
• M32: 22,138,989 km (0.099 R)
• M33: 22,444,617 km (0.109 R)
• M34: 23,681,493 km (0.056 R)
• M35: 24,119,665 km (0.115 R)
• M36: 25,706,150 km (0.083 R)
• M37: 26,350,169 km (0.081 R)
• M38: 27,195,247 km (0.059 R)
• M39: 29,514,463 km (0.034 R)
• M40: 30,256,319 km (0.108 R)
• M41: 30,663,674 km (0.118 R)
• M42: 30,936,092 km (0.114 R)
• M43: 31,758,581 km (0.089 R)
• M44: 32,449,274 km (0.12 R)
• M45: 33,354,790 km (0.101 R)
• M46: 34,056,853 km (0.08 R)
• M47: 34,764,002 km (0.105 R)
• M48: 35,404,430 km (0.115 R)
• M49: 37,131,239 km (0.084 R)
• M50: 37,640,021 km (0.113 R)
• M51: 37,858,883 km (0.101 R)
• M52: 38,004,890 km (0.078 R)
• M53: 38,151,197 km (0.108 R)
• M54: 38,444,259 km (0.043 R)
• M55: 38,591,164 km (0.112 R)
• M56: 39,032,777 km (0.089 R)
• M57: 39,180,430 km (0.065 R)
• M58: 39,921,089 km (0.1 R)
• M59: 40,367,639 km (0.083 R)
• M60: 40,666,386 km (0.089 R)
• M61: 41,491,568 km (0.106 R)
• M62: 41,793,008 km (0.111 R)
• M63: 42,473,827 km (0.118 R)
• M64: 43,005,947 km (0.098 R)
• M65: 43,158,387 km (0.078 R)
• M66: 43,310,977 km (0.044 R)
• M67: 45,854,889 km (0.034 R)
• M68: 45,932,829 km (0.119 R)
• M69: 46,088,561 km (0.069 R)
• M70: 46,244,591 km (0.085 R)
• M71: 46,322,681 km (0.071 R)
• M72: 47,814,172 km (0.085 R)
• M73: 48,843,705 km (0.073 R)
• M74: 49,640,762 km (0.119 R)
• M75: 50,040,787 km (0.086 R)
• M76: 51,651,806 km (0.066 R)
• M77: 54,594,397 km (0.044 R)

Kuiper Belt

Range: 30 - 48 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 259 - 17,025 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit