🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.36 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.72 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 334.6

Radius: 12.4

Gravity: 2.18 G

Time & Orbit

Eccentricity (e): 0.096

Orbit Range: 0.65 AU - 0.79 AU

Year: 401 Days

Day: 8 Hours

Environment

Temp: -137 °C

Axial Tilt: 45.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (35)

Outer Limit: 62,455,700 km

• M1: 174,132 km (0.036 R)
• M2: 252,521 km (0.117 R)
• M3: 351,854 km (0.069 R)
• M4: 435,031 km (0.05 R)
• M5: 513,121 km (0.075 R)
• M6: 729,738 km (0.101 R)
• M7: 904,918 km (0.093 R)
• M8: 1,075,758 km (0.098 R)
• M9: 1,221,467 km (0.118 R)
• M10: 1,319,752 km (0.073 R)
• M11: 1,494,034 km (0.11 R)
• M12: 1,581,997 km (0.067 R)
• M13: 1,699,133 km (0.069 R)
• M14: 1,809,835 km (0.105 R)
• M15: 2,083,001 km (0.049 R)
• M16: 2,167,075 km (0.073 R)
• M17: 2,267,455 km (0.079 R)
• M18: 2,359,308 km (0.09 R)
• M19: 2,447,122 km (0.077 R)
• M20: 2,562,612 km (0.111 R)
• M21: 2,690,667 km (0.114 R)
• M22: 2,804,511 km (0.086 R)
• M23: 3,150,232 km (0.05 R)
• M24: 3,241,636 km (0.112 R)
• M25: 3,351,441 km (0.112 R)
• M26: 3,462,592 km (0.07 R)
• M27: 3,545,170 km (0.081 R)
• M28: 3,646,448 km (0.08 R)
• M29: 3,791,109 km (0.081 R)
• M30: 3,870,396 km (0.072 R)
• M31: 3,993,216 km (0.102 R)
• M32: 4,073,849 km (0.118 R)
• M33: 4,167,497 km (0.104 R)
• M34: 4,280,893 km (0.1 R)
• M35: 4,382,619 km (0.079 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.98 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 940.7

Radius: 12.2

Gravity: 6.32 G

Time & Orbit

Eccentricity (e): 0.155

Orbit Range: 0.83 AU - 1.13 AU

Year: 636 Days

Day: 10.9 Hours

Environment

Temp: -152 °C

Axial Tilt: 38.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (48)

Outer Limit: 62,455,700 km

• M1: 160,070 km (0.047 R)
• M2: 280,496 km (0.067 R)
• M3: 431,440 km (0.115 R)
• M4: 524,789 km (0.096 R)
• M5: 645,964 km (0.07 R)
• M6: 746,793 km (0.103 R)
• M7: 971,638 km (0.072 R)
• M8: 1,169,407 km (0.118 R)
• M9: 1,257,520 km (0.047 R)
• M10: 1,427,463 km (0.12 R)
• M11: 1,515,426 km (0.112 R)
• M12: 1,591,422 km (0.089 R)
• M13: 1,668,764 km (0.108 R)
• M14: 1,783,506 km (0.05 R)
• M15: 1,938,340 km (0.086 R)
• M16: 2,051,884 km (0.071 R)
• M17: 2,230,355 km (0.098 R)
• M18: 2,309,492 km (0.068 R)
• M19: 2,422,139 km (0.114 R)
• M20: 2,627,836 km (0.037 R)
• M21: 2,711,761 km (0.097 R)
• M22: 2,796,583 km (0.106 R)
• M23: 2,890,979 km (0.097 R)
• M24: 2,969,069 km (0.11 R)
• M25: 3,047,757 km (0.094 R)
• M26: 3,153,972 km (0.093 R)
• M27: 3,270,359 km (0.108 R)
• M28: 3,370,141 km (0.091 R)
• M29: 3,535,446 km (0.06 R)
• M30: 3,665,896 km (0.084 R)
• M31: 3,760,142 km (0.1 R)
• M32: 3,912,583 km (0.1 R)
• M33: 4,115,886 km (0.117 R)
• M34: 4,213,873 km (0.105 R)
• M35: 4,452,481 km (0.111 R)
• M36: 4,532,965 km (0.03 R)
• M37: 4,736,418 km (0.062 R)
• M38: 4,839,192 km (0.103 R)
• M39: 5,279,458 km (0.116 R)
• M40: 5,601,991 km (0.106 R)
• M41: 6,311,385 km (0.119 R)
• M42: 6,665,333 km (0.082 R)
• M43: 6,955,403 km (0.12 R)
• M44: 7,131,480 km (0.063 R)
• M45: 7,680,803 km (0.067 R)
• M46: 7,948,434 km (0.069 R)
• M47: 8,120,322 km (0.109 R)
• M48: 8,492,821 km (0.113 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.82 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 110.1

Radius: 11.2

Gravity: 0.88 G

Time & Orbit

Eccentricity (e): 0.134

Orbit Range: 1.58 AU - 2.06 AU

Year: 1611 Days

Day: 12.5 Hours

Environment

Temp: -190 °C

Axial Tilt: 34.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (41)

Outer Limit: 62,455,700 km

• M1: 140,472 km (0.039 R)
• M2: 234,420 km (0.051 R)
• M3: 310,715 km (0.116 R)
• M4: 423,212 km (0.103 R)
• M5: 494,421 km (0.092 R)
• M6: 624,122 km (0.049 R)
• M7: 756,816 km (0.105 R)
• M8: 827,127 km (0.086 R)
• M9: 942,467 km (0.078 R)
• M10: 1,046,736 km (0.119 R)
• M11: 1,166,863 km (0.11 R)
• M12: 1,562,400 km (0.118 R)
• M13: 1,701,227 km (0.083 R)
• M14: 2,048,593 km (0.091 R)
• M15: 2,290,343 km (0.079 R)
• M16: 2,441,437 km (0.096 R)
• M17: 2,635,017 km (0.07 R)
• M18: 2,729,862 km (0.055 R)
• M19: 2,866,146 km (0.078 R)
• M20: 2,971,911 km (0.097 R)
• M21: 3,062,418 km (0.036 R)
• M22: 3,162,200 km (0.097 R)
• M23: 3,280,083 km (0.12 R)
• M24: 3,520,337 km (0.055 R)
• M25: 3,669,037 km (0.036 R)
• M26: 4,081,927 km (0.048 R)
• M27: 4,275,358 km (0.046 R)
• M28: 4,415,531 km (0.103 R)
• M29: 4,547,626 km (0.089 R)
• M30: 4,874,198 km (0.112 R)
• M31: 5,458,826 km (0.093 R)
• M32: 5,836,860 km (0.115 R)
• M33: 6,023,857 km (0.092 R)
• M34: 6,128,576 km (0.046 R)
• M35: 6,244,664 km (0.062 R)
• M36: 6,393,215 km (0.049 R)
• M37: 6,468,014 km (0.071 R)
• M38: 6,586,046 km (0.069 R)
• M39: 6,748,360 km (0.11 R)
• M40: 7,500,239 km (0.099 R)
• M41: 7,703,842 km (0.071 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.06 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 379.1

Radius: 8.6

Gravity: 5.13 G

Time & Orbit

Eccentricity (e): 0.037

Orbit Range: 1.98 AU - 2.14 AU

Year: 1940 Days

Day: 13.2 Hours

Environment

Temp: -196 °C

Axial Tilt: 36.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (66)

Outer Limit: 62,455,700 km

• M1: 108,159 km (0.113 R)
• M2: 215,571 km (0.048 R)
• M3: 275,709 km (0.073 R)
• M4: 402,867 km (0.097 R)
• M5: 533,017 km (0.068 R)
• M6: 610,359 km (0.07 R)
• M7: 671,246 km (0.109 R)
• M8: 777,460 km (0.087 R)
• M9: 866,770 km (0.117 R)
• M10: 936,183 km (0.079 R)
• M11: 999,613 km (0.083 R)
• M12: 1,259,315 km (0.107 R)
• M13: 1,484,310 km (0.108 R)
• M14: 1,577,958 km (0.084 R)
• M15: 1,644,829 km (0.107 R)
• M16: 1,781,262 km (0.117 R)
• M17: 1,871,021 km (0.106 R)
• M18: 1,931,757 km (0.107 R)
• M19: 2,086,442 km (0.118 R)
• M20: 2,149,572 km (0.109 R)
• M21: 2,245,464 km (0.059 R)
• M22: 2,320,861 km (0.119 R)
• M23: 2,530,298 km (0.075 R)
• M24: 2,608,987 km (0.061 R)
• M25: 2,780,426 km (0.105 R)
• M26: 2,873,476 km (0.073 R)
• M27: 3,158,759 km (0.118 R)
• M28: 3,391,085 km (0.054 R)
• M29: 3,490,567 km (0.055 R)
• M30: 3,603,663 km (0.073 R)
• M31: 3,730,821 km (0.085 R)
• M32: 3,989,626 km (0.101 R)
• M33: 4,174,229 km (0.1 R)
• M34: 4,267,728 km (0.064 R)
• M35: 4,814,807 km (0.089 R)
• M36: 5,412,900 km (0.063 R)
• M37: 5,705,962 km (0.096 R)
• M38: 5,765,203 km (0.104 R)
• M39: 5,824,743 km (0.097 R)
• M40: 5,974,191 km (0.047 R)
• M41: 6,307,794 km (0.113 R)
• M42: 7,056,382 km (0.105 R)
• M43: 7,441,148 km (0.082 R)
• M44: 7,767,121 km (0.092 R)
• M45: 8,014,706 km (0.061 R)
• M46: 8,281,589 km (0.082 R)
• M47: 8,432,982 km (0.072 R)
• M48: 8,892,845 km (0.083 R)
• M49: 8,978,864 km (0.054 R)
• M50: 9,203,859 km (0.098 R)
• M51: 9,343,285 km (0.025 R)
• M52: 9,430,799 km (0.054 R)
• M53: 10,086,786 km (0.053 R)
• M54: 10,447,466 km (0.101 R)
• M55: 10,739,033 km (0.118 R)
• M56: 11,107,343 km (0.095 R)
• M57: 11,292,994 km (0.085 R)
• M58: 11,423,593 km (0.064 R)
• M59: 11,592,339 km (0.05 R)
• M60: 11,724,135 km (0.069 R)
• M61: 11,780,683 km (0.066 R)
• M62: 11,837,380 km (0.112 R)
• M63: 11,989,073 km (0.096 R)
• M64: 12,046,219 km (0.113 R)
• M65: 12,660,318 km (0.11 R)
• M66: 13,166,857 km (0.101 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 80.9

Radius: 12.3

Gravity: 0.53 G

Time & Orbit

Eccentricity (e): 0.14

Orbit Range: 2.22 AU - 2.94 AU

Year: 2719 Days

Day: 6.2 Hours

Environment

Temp: -204 °C

Axial Tilt: 42.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (53)

Outer Limit: 62,455,700 km

• M1: 157,527 km (0.037 R)
• M2: 245,789 km (0.06 R)
• M3: 356,492 km (0.078 R)
• M4: 455,675 km (0.09 R)
• M5: 645,664 km (0.11 R)
• M6: 734,376 km (0.114 R)
• M7: 816,056 km (0.109 R)
• M8: 919,877 km (0.119 R)
• M9: 1,002,455 km (0.112 R)
• M10: 1,108,071 km (0.093 R)
• M11: 1,231,639 km (0.094 R)
• M12: 1,396,795 km (0.108 R)
• M13: 1,516,174 km (0.084 R)
• M14: 1,646,923 km (0.099 R)
• M15: 1,781,561 km (0.107 R)
• M16: 1,953,150 km (0.108 R)
• M17: 2,199,388 km (0.087 R)
• M18: 2,304,406 km (0.052 R)
• M19: 2,402,093 km (0.117 R)
• M20: 2,601,806 km (0.057 R)
• M21: 2,854,477 km (0.07 R)
• M22: 2,979,092 km (0.118 R)
• M23: 3,154,720 km (0.077 R)
• M24: 3,293,696 km (0.12 R)
• M25: 3,567,610 km (0.106 R)
• M26: 3,670,982 km (0.116 R)
• M27: 3,827,910 km (0.075 R)
• M28: 3,987,082 km (0.109 R)
• M29: 4,148,499 km (0.082 R)
• M30: 4,367,211 km (0.113 R)
• M31: 4,511,573 km (0.073 R)
• M32: 4,612,252 km (0.087 R)
• M33: 4,884,819 km (0.116 R)
• M34: 5,011,529 km (0.111 R)
• M35: 5,150,954 km (0.09 R)
• M36: 5,279,907 km (0.094 R)
• M37: 5,457,630 km (0.057 R)
• M38: 5,541,255 km (0.067 R)
• M39: 5,879,944 km (0.101 R)
• M40: 6,039,565 km (0.067 R)
• M41: 6,126,033 km (0.111 R)
• M42: 6,756,289 km (0.115 R)
• M43: 6,949,419 km (0.055 R)
• M44: 7,105,300 km (0.06 R)
• M45: 7,328,052 km (0.093 R)
• M46: 7,566,511 km (0.089 R)
• M47: 7,969,527 km (0.064 R)
• M48: 8,105,512 km (0.06 R)
• M49: 8,187,491 km (0.091 R)
• M50: 8,421,163 km (0.107 R)
• M51: 8,838,841 km (0.062 R)
• M52: 8,923,214 km (0.058 R)
• M53: 9,521,456 km (0.098 R)

Planet 6 - Gas Giant

Semi-Major Axis: 5 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 481.7

Radius: 9.7

Gravity: 5.12 G

Time & Orbit

Eccentricity (e): 0.234

Orbit Range: 3.83 AU - 6.17 AU

Year: 7334 Days

Day: 7.4 Hours

Environment

Temp: -212 °C

Axial Tilt: 32.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 62,455,700 km

• M1: 140,921 km (0.08 R)
• M2: 211,083 km (0.034 R)
• M3: 300,093 km (0.069 R)
• M4: 439,519 km (0.111 R)
• M5: 542,143 km (0.054 R)
• M6: 666,907 km (0.075 R)
• M7: 830,119 km (0.109 R)
• M8: 931,845 km (0.068 R)
• M9: 1,213,089 km (0.08 R)
• M10: 1,329,775 km (0.052 R)
• M11: 2,228,709 km (0.111 R)
• M12: 2,414,958 km (0.102 R)
• M13: 2,478,238 km (0.106 R)
• M14: 2,606,444 km (0.107 R)
• M15: 2,869,437 km (0.106 R)
• M16: 3,072,441 km (0.046 R)
• M17: 3,588,554 km (0.106 R)
• M18: 3,734,112 km (0.115 R)
• M19: 3,832,099 km (0.077 R)
• M20: 4,081,180 km (0.094 R)
• M21: 4,157,026 km (0.102 R)
• M22: 4,438,868 km (0.065 R)
• M23: 5,048,180 km (0.09 R)
• M24: 5,683,821 km (0.064 R)
• M25: 6,112,120 km (0.105 R)
• M26: 6,639,752 km (0.069 R)
• M27: 7,365,900 km (0.092 R)
• M28: 7,707,133 km (0.118 R)
• M29: 7,832,496 km (0.088 R)
• M30: 7,958,607 km (0.107 R)
• M31: 8,469,783 km (0.079 R)
• M32: 8,631,648 km (0.116 R)
• M33: 8,696,723 km (0.098 R)
• M34: 9,090,464 km (0.08 R)
• M35: 9,256,219 km (0.101 R)
• M36: 9,725,806 km (0.11 R)
• M37: 9,793,574 km (0.062 R)
• M38: 10,340,953 km (0.067 R)
• M39: 10,653,313 km (0.032 R)
• M40: 11,644,848 km (0.079 R)
• M41: 11,897,219 km (0.105 R)
• M42: 12,665,554 km (0.116 R)
• M43: 12,776,556 km (0.118 R)
• M44: 12,999,756 km (0.112 R)
• M45: 13,111,805 km (0.049 R)
• M46: 13,336,800 km (0.112 R)
• M47: 13,412,197 km (0.039 R)
• M48: 14,365,435 km (0.077 R)
• M49: 15,855,878 km (0.082 R)
• M50: 16,135,776 km (0.117 R)
• M51: 17,148,853 km (0.089 R)
• M52: 17,518,509 km (0.076 R)
• M53: 17,683,665 km (0.046 R)
• M54: 17,890,858 km (0.082 R)
• M55: 17,974,035 km (0.095 R)
• M56: 18,057,211 km (0.115 R)
• M57: 18,224,013 km (0.095 R)
• M58: 18,559,261 km (0.08 R)
• M59: 19,577,275 km (0.086 R)
• M60: 20,006,770 km (0.12 R)
• M61: 20,309,257 km (0.113 R)
• M62: 20,396,024 km (0.094 R)
• M63: 20,875,036 km (0.091 R)
• M64: 20,962,551 km (0.083 R)
• M65: 21,578,595 km (0.098 R)
• M66: 22,200,474 km (0.102 R)
• M67: 22,603,490 km (0.075 R)
• M68: 22,918,543 km (0.114 R)
• M69: 23,325,749 km (0.098 R)
• M70: 23,918,156 km (0.098 R)
• M71: 24,239,343 km (0.035 R)
• M72: 24,700,404 km (0.052 R)
• M73: 24,885,755 km (0.058 R)
• M74: 25,257,656 km (0.106 R)
• M75: 26,337,154 km (0.031 R)
• M76: 26,573,967 km (0.091 R)
• M77: 27,671,717 km (0.103 R)
• M78: 28,250,361 km (0.102 R)
• M79: 30,158,482 km (0.095 R)
• M80: 30,704,215 km (0.072 R)
• M81: 30,803,698 km (0.089 R)
• M82: 32,360,712 km (0.112 R)
• M83: 33,481,200 km (0.116 R)
• M84: 34,510,733 km (0.105 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.58 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 808.5

Radius: 5.7

Gravity: 24.88 G

Time & Orbit

Eccentricity (e): 0.059

Orbit Range: 7.13 AU - 8.03 AU

Year: 13690 Days

Day: 17.9 Hours

Environment

Temp: -231 °C

Axial Tilt: 33.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 62,455,700 km

• M1: 174,282 km (0.093 R)
• M2: 514,916 km (0.074 R)
• M3: 726,896 km (0.082 R)
• M4: 853,755 km (0.101 R)
• M5: 964,906 km (0.083 R)
• M6: 1,152,801 km (0.105 R)
• M7: 1,201,570 km (0.094 R)
• M8: 1,456,036 km (0.104 R)
• M9: 2,346,891 km (0.04 R)
• M10: 3,551,154 km (0.078 R)
• M11: 4,290,168 km (0.085 R)
• M12: 4,755,866 km (0.108 R)
• M13: 5,115,649 km (0.113 R)
• M14: 5,442,819 km (0.112 R)
• M15: 5,734,685 km (0.057 R)
• M16: 6,203,525 km (0.047 R)
• M17: 6,290,142 km (0.118 R)
• M18: 7,451,769 km (0.117 R)
• M19: 7,682,599 km (0.119 R)
• M20: 8,056,893 km (0.09 R)
• M21: 8,104,165 km (0.118 R)
• M22: 9,018,508 km (0.07 R)
• M23: 10,373,116 km (0.083 R)
• M24: 10,527,501 km (0.1 R)
• M25: 10,786,455 km (0.112 R)
• M26: 11,152,671 km (0.113 R)
• M27: 11,205,329 km (0.065 R)
• M28: 12,058,785 km (0.109 R)
• M29: 12,657,775 km (0.116 R)
• M30: 12,712,677 km (0.1 R)
• M31: 13,099,388 km (0.072 R)
• M32: 16,209,528 km (0.09 R)
• M33: 16,508,574 km (0.082 R)
• M34: 16,749,127 km (0.108 R)
• M35: 16,990,877 km (0.107 R)
• M36: 17,294,561 km (0.116 R)
• M37: 18,652,461 km (0.1 R)
• M38: 19,091,531 km (0.102 R)
• M39: 21,142,218 km (0.116 R)
• M40: 21,665,661 km (0.108 R)
• M41: 22,061,048 km (0.119 R)
• M42: 22,926,023 km (0.069 R)
• M43: 23,937,754 km (0.072 R)
• M44: 24,005,671 km (0.083 R)
• M45: 24,141,805 km (0.083 R)
• M46: 24,278,238 km (0.04 R)
• M47: 24,414,821 km (0.099 R)
• M48: 24,688,885 km (0.057 R)
• M49: 25,032,810 km (0.044 R)
• M50: 25,170,889 km (0.044 R)
• M51: 26,635,452 km (0.112 R)
• M52: 27,271,692 km (0.056 R)
• M53: 29,938,872 km (0.102 R)
• M54: 30,232,234 km (0.11 R)
• M55: 30,747,748 km (0.09 R)
• M56: 31,712,953 km (0.079 R)
• M57: 32,386,892 km (0.12 R)
• M58: 32,990,070 km (0.042 R)
• M59: 33,520,844 km (0.105 R)
• M60: 33,672,985 km (0.098 R)
• M61: 38,104,971 km (0.032 R)
• M62: 38,184,258 km (0.117 R)
• M63: 38,263,695 km (0.116 R)
• M64: 39,863,793 km (0.034 R)
• M65: 40,105,693 km (0.09 R)
• M66: 40,186,476 km (0.12 R)
• M67: 42,222,503 km (0.089 R)
• M68: 42,881,182 km (0.069 R)
• M69: 42,963,760 km (0.092 R)
• M70: 46,055,649 km (0.062 R)
• M71: 46,224,844 km (0.051 R)
• M72: 46,309,517 km (0.086 R)
• M73: 46,648,655 km (0.025 R)
• M74: 47,158,934 km (0.107 R)
• M75: 48,614,820 km (0.093 R)
• M76: 48,700,839 km (0.103 R)
• M77: 49,478,000 km (0.104 R)
• M78: 49,564,617 km (0.094 R)
• M79: 49,651,234 km (0.08 R)
• M80: 49,998,451 km (0.113 R)
• M81: 50,957,074 km (0.048 R)
• M82: 51,044,589 km (0.104 R)
• M83: 51,834,017 km (0.089 R)
• M84: 52,009,944 km (0.096 R)
• M85: 52,627,334 km (0.068 R)
• M86: 52,892,721 km (0.083 R)
• M87: 52,981,283 km (0.119 R)
• M88: 53,335,979 km (0.085 R)
• M89: 54,583,625 km (0.054 R)
• M90: 55,031,522 km (0.114 R)
• M91: 55,300,947 km (0.068 R)
• M92: 56,292,183 km (0.092 R)
• M93: 57,380,358 km (0.074 R)
• M94: 58,750,225 km (0.069 R)
• M95: 60,871,673 km (0.117 R)
• M96: 61,057,324 km (0.107 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: 520 - 19,915 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit