🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.29 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 761.4

Radius: 9.1

Gravity: 9.19 G

Time & Orbit

Eccentricity (e): 0.009

Orbit Range: 0.57 AU - 0.59 AU

Year: 295 Days

Day: 10.3 Hours

Environment

Temp: -155 °C

Axial Tilt: 22.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 75,231,257 km

• M1: 126,261 km (0.117 R)
• M2: 219,759 km (0.057 R)
• M3: 286,480 km (0.07 R)
• M4: 344,973 km (0.118 R)
• M5: 439,967 km (0.113 R)
• M6: 520,451 km (0.065 R)
• M7: 583,731 km (0.103 R)
• M8: 653,294 km (0.053 R)
• M9: 816,505 km (0.116 R)
• M10: 903,272 km (0.105 R)
• M11: 1,082,640 km (0.04 R)
• M12: 1,196,035 km (0.109 R)
• M13: 1,273,826 km (0.034 R)
• M14: 1,357,900 km (0.107 R)
• M15: 1,485,357 km (0.104 R)
• M16: 1,560,007 km (0.077 R)
• M17: 1,718,132 km (0.106 R)
• M18: 1,791,883 km (0.076 R)
• M19: 1,861,596 km (0.069 R)
• M20: 1,973,046 km (0.083 R)
• M21: 2,050,388 km (0.057 R)
• M22: 2,181,436 km (0.068 R)
• M23: 2,272,242 km (0.115 R)
• M24: 2,369,929 km (0.089 R)
• M25: 2,541,219 km (0.115 R)
• M26: 2,693,809 km (0.113 R)
• M27: 2,797,331 km (0.08 R)
• M28: 2,867,043 km (0.066 R)
• M29: 2,931,370 km (0.089 R)
• M30: 3,014,098 km (0.101 R)
• M31: 3,181,947 km (0.052 R)
• M32: 3,365,204 km (0.114 R)
• M33: 3,558,185 km (0.101 R)
• M34: 3,678,312 km (0.086 R)
• M35: 3,793,353 km (0.059 R)
• M36: 3,935,621 km (0.101 R)
• M37: 4,132,641 km (0.12 R)
• M38: 4,218,959 km (0.083 R)
• M39: 4,332,803 km (0.073 R)
• M40: 4,413,736 km (0.037 R)
• M41: 4,611,504 km (0.066 R)
• M42: 4,701,113 km (0.063 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.59 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 123.8

Radius: 10.4

Gravity: 1.14 G

Time & Orbit

Eccentricity (e): 0.087

Orbit Range: 0.54 AU - 0.64 AU

Year: 302 Days

Day: 6.3 Hours

Environment

Temp: -146 °C

Axial Tilt: 32 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (26)

Outer Limit: 75,231,257 km

• M1: 129,552 km (0.07 R)
• M2: 207,193 km (0.086 R)
• M3: 289,322 km (0.106 R)
• M4: 390,899 km (0.091 R)
• M5: 521,797 km (0.09 R)
• M6: 596,746 km (0.1 R)
• M7: 673,789 km (0.075 R)
• M8: 745,297 km (0.082 R)
• M9: 819,497 km (0.06 R)
• M10: 891,603 km (0.085 R)
• M11: 1,013,226 km (0.098 R)
• M12: 1,110,315 km (0.073 R)
• M13: 1,247,945 km (0.047 R)
• M14: 1,373,458 km (0.055 R)
• M15: 1,466,807 km (0.102 R)
• M16: 1,562,251 km (0.116 R)
• M17: 1,647,222 km (0.072 R)
• M18: 1,730,399 km (0.068 R)
• M19: 1,841,550 km (0.105 R)
• M20: 1,931,608 km (0.068 R)
• M21: 2,019,721 km (0.071 R)
• M22: 2,105,740 km (0.091 R)
• M23: 2,189,664 km (0.079 R)
• M24: 2,335,372 km (0.075 R)
• M25: 2,480,931 km (0.082 R)
• M26: 2,580,713 km (0.069 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.65 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 859.6

Radius: 9.2

Gravity: 10.16 G

Time & Orbit

Eccentricity (e): 0.102

Orbit Range: 0.58 AU - 0.72 AU

Year: 349 Days

Day: 9.8 Hours

Environment

Temp: -156 °C

Axial Tilt: 15.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (49)

Outer Limit: 75,231,257 km

• M1: 116,986 km (0.101 R)
• M2: 210,335 km (0.076 R)
• M3: 277,953 km (0.109 R)
• M4: 379,829 km (0.069 R)
• M5: 444,605 km (0.063 R)
• M6: 541,544 km (0.096 R)
• M7: 635,193 km (0.093 R)
• M8: 723,156 km (0.101 R)
• M9: 799,002 km (0.062 R)
• M10: 890,556 km (0.077 R)
• M11: 1,030,430 km (0.087 R)
• M12: 1,182,571 km (0.117 R)
• M13: 1,278,463 km (0.117 R)
• M14: 1,337,405 km (0.108 R)
• M15: 1,422,377 km (0.104 R)
• M16: 1,519,615 km (0.076 R)
• M17: 1,629,719 km (0.112 R)
• M18: 1,753,586 km (0.064 R)
• M19: 1,874,910 km (0.112 R)
• M20: 2,085,544 km (0.113 R)
• M21: 2,155,406 km (0.106 R)
• M22: 2,232,150 km (0.068 R)
• M23: 2,303,807 km (0.081 R)
• M24: 2,461,783 km (0.083 R)
• M25: 2,548,400 km (0.071 R)
• M26: 2,673,763 km (0.043 R)
• M27: 2,807,802 km (0.109 R)
• M28: 3,089,046 km (0.089 R)
• M29: 3,189,277 km (0.071 R)
• M30: 3,270,359 km (0.104 R)
• M31: 3,427,586 km (0.041 R)
• M32: 3,524,675 km (0.079 R)
• M33: 3,664,699 km (0.107 R)
• M34: 3,735,459 km (0.026 R)
• M35: 4,074,298 km (0.093 R)
• M36: 4,162,411 km (0.089 R)
• M37: 4,363,022 km (0.045 R)
• M38: 4,468,339 km (0.114 R)
• M39: 4,673,737 km (0.105 R)
• M40: 4,812,414 km (0.059 R)
• M41: 4,874,497 km (0.074 R)
• M42: 4,960,366 km (0.066 R)
• M43: 5,023,048 km (0.097 R)
• M44: 5,125,522 km (0.065 R)
• M45: 5,188,952 km (0.1 R)
• M46: 5,252,680 km (0.064 R)
• M47: 5,348,722 km (0.083 R)
• M48: 5,421,128 km (0.105 R)
• M49: 5,493,832 km (0.106 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 302.6

Radius: 10.9

Gravity: 2.55 G

Time & Orbit

Eccentricity (e): 0.102

Orbit Range: 1.4 AU - 1.72 AU

Year: 1299 Days

Day: 11.3 Hours

Environment

Temp: -202 °C

Axial Tilt: 43.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (52)

Outer Limit: 75,231,257 km

• M1: 144,811 km (0.115 R)
• M2: 238,758 km (0.104 R)
• M3: 310,116 km (0.118 R)
• M4: 427,401 km (0.071 R)
• M5: 613,800 km (0.103 R)
• M6: 737,368 km (0.089 R)
• M7: 948,750 km (0.086 R)
• M8: 1,049,279 km (0.086 R)
• M9: 1,133,802 km (0.113 R)
• M10: 1,289,234 km (0.04 R)
• M11: 1,591,871 km (0.025 R)
• M12: 1,705,416 km (0.086 R)
• M13: 1,821,952 km (0.05 R)
• M14: 1,973,346 km (0.086 R)
• M15: 2,145,682 km (0.101 R)
• M16: 2,255,038 km (0.066 R)
• M17: 2,331,782 km (0.114 R)
• M18: 2,514,291 km (0.114 R)
• M19: 2,638,757 km (0.109 R)
• M20: 2,756,191 km (0.063 R)
• M21: 3,024,420 km (0.118 R)
• M22: 3,109,392 km (0.108 R)
• M23: 3,301,176 km (0.075 R)
• M24: 3,398,564 km (0.087 R)
• M25: 3,477,253 km (0.06 R)
• M26: 3,666,494 km (0.108 R)
• M27: 3,777,645 km (0.06 R)
• M28: 3,879,671 km (0.084 R)
• M29: 4,265,185 km (0.087 R)
• M30: 4,424,955 km (0.092 R)
• M31: 4,695,877 km (0.114 R)
• M32: 4,960,965 km (0.073 R)
• M33: 5,129,262 km (0.117 R)
• M34: 5,436,985 km (0.102 R)
• M35: 5,506,099 km (0.12 R)
• M36: 5,774,179 km (0.116 R)
• M37: 6,094,318 km (0.106 R)
• M38: 6,214,296 km (0.091 R)
• M39: 6,286,701 km (0.113 R)
• M40: 6,469,061 km (0.08 R)
• M41: 6,863,700 km (0.071 R)
• M42: 6,988,764 km (0.087 R)
• M43: 7,152,424 km (0.104 R)
• M44: 7,304,565 km (0.104 R)
• M45: 7,419,306 km (0.093 R)
• M46: 7,496,200 km (0.103 R)
• M47: 7,793,451 km (0.061 R)
• M48: 8,068,262 km (0.115 R)
• M49: 8,346,364 km (0.116 R)
• M50: 8,789,623 km (0.093 R)
• M51: 9,212,985 km (0.114 R)
• M52: 9,323,388 km (0.071 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.16 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 734.1

Radius: 11.3

Gravity: 5.75 G

Time & Orbit

Eccentricity (e): 0.052

Orbit Range: 2.05 AU - 2.27 AU

Year: 2117 Days

Day: 7.4 Hours

Environment

Temp: -203 °C

Axial Tilt: 32.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (70)

Outer Limit: 75,231,257 km

• M1: 157,826 km (0.109 R)
• M2: 316,699 km (0.097 R)
• M3: 413,788 km (0.09 R)
• M4: 576,401 km (0.082 R)
• M5: 703,559 km (0.089 R)
• M6: 950,545 km (0.112 R)
• M7: 1,045,839 km (0.105 R)
• M8: 1,267,393 km (0.068 R)
• M9: 1,460,374 km (0.088 R)
• M10: 1,887,626 km (0.056 R)
• M11: 2,059,364 km (0.117 R)
• M12: 2,431,713 km (0.106 R)
• M13: 2,538,377 km (0.12 R)
• M14: 2,660,149 km (0.085 R)
• M15: 2,867,492 km (0.057 R)
• M16: 3,008,862 km (0.08 R)
• M17: 3,269,013 km (0.059 R)
• M18: 3,765,229 km (0.065 R)
• M19: 3,857,979 km (0.067 R)
• M20: 3,951,628 km (0.082 R)
• M21: 4,109,304 km (0.119 R)
• M22: 4,545,531 km (0.105 R)
• M23: 4,811,217 km (0.087 R)
• M24: 4,979,814 km (0.115 R)
• M25: 5,219,171 km (0.12 R)
• M26: 5,462,267 km (0.118 R)
• M27: 5,585,386 km (0.038 R)
• M28: 5,959,979 km (0.118 R)
• M29: 7,286,314 km (0.069 R)
• M30: 7,558,432 km (0.066 R)
• M31: 7,853,589 km (0.114 R)
• M32: 8,012,761 km (0.086 R)
• M33: 8,192,877 km (0.092 R)
• M34: 8,313,752 km (0.058 R)
• M35: 8,475,916 km (0.071 R)
• M36: 8,700,463 km (0.118 R)
• M37: 8,823,881 km (0.095 R)
• M38: 9,030,775 km (0.092 R)
• M39: 9,134,895 km (0.05 R)
• M40: 9,260,258 km (0.085 R)
• M41: 9,555,115 km (0.118 R)
• M42: 9,682,423 km (0.106 R)
• M43: 9,767,544 km (0.11 R)
• M44: 10,003,161 km (0.104 R)
• M45: 10,110,871 km (0.03 R)
• M46: 10,349,181 km (0.071 R)
• M47: 10,436,396 km (0.114 R)
• M48: 10,611,426 km (0.048 R)
• M49: 10,986,468 km (0.106 R)
• M50: 11,209,219 km (0.108 R)
• M51: 12,137,922 km (0.083 R)
• M52: 12,252,814 km (0.05 R)
• M53: 12,368,154 km (0.056 R)
• M54: 12,973,576 km (0.088 R)
• M55: 13,636,594 km (0.04 R)
• M56: 13,756,123 km (0.12 R)
• M57: 13,996,227 km (0.119 R)
• M58: 14,480,625 km (0.095 R)
• M59: 14,749,452 km (0.056 R)
• M60: 14,872,123 km (0.074 R)
• M61: 15,341,710 km (0.077 R)
• M62: 15,441,043 km (0.055 R)
• M63: 15,866,201 km (0.059 R)
• M64: 15,941,598 km (0.049 R)
• M65: 16,118,123 km (0.104 R)
• M66: 16,244,534 km (0.089 R)
• M67: 16,498,401 km (0.03 R)
• M68: 16,907,402 km (0.05 R)
• M69: 17,164,560 km (0.039 R)
• M70: 17,423,215 km (0.089 R)

Planet 6 - Ice Giant

Semi-Major Axis: 8.05 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 634.2

Radius: 4.4

Gravity: 32.76 G

Time & Orbit

Eccentricity (e): 0.141

Orbit Range: 6.91 AU - 9.19 AU

Year: 15231 Days

Day: 16.1 Hours

Environment

Temp: -228 °C

Axial Tilt: 14.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 75,231,257 km

• M1: 83,476 km (0.093 R)
• M2: 298,897 km (0.09 R)
• M3: 724,951 km (0.052 R)
• M4: 917,783 km (0.118 R)
• M5: 1,031,777 km (0.08 R)
• M6: 1,102,387 km (0.08 R)
• M7: 1,323,792 km (0.107 R)
• M8: 1,400,685 km (0.102 R)
• M9: 2,008,651 km (0.094 R)
• M10: 3,291,452 km (0.074 R)
• M11: 3,716,310 km (0.108 R)
• M12: 3,861,869 km (0.055 R)
• M13: 4,462,355 km (0.113 R)
• M14: 4,773,369 km (0.079 R)
• M15: 5,747,849 km (0.085 R)
• M16: 5,916,147 km (0.108 R)
• M17: 6,086,090 km (0.086 R)
• M18: 6,128,726 km (0.118 R)
• M19: 6,214,595 km (0.101 R)
• M20: 6,781,571 km (0.109 R)
• M21: 6,825,852 km (0.05 R)
• M22: 7,639,664 km (0.067 R)
• M23: 7,685,890 km (0.087 R)
• M24: 8,675,330 km (0.114 R)
• M25: 9,062,789 km (0.075 R)
• M26: 9,357,048 km (0.103 R)
• M27: 9,455,782 km (0.079 R)
• M28: 9,604,632 km (0.11 R)
• M29: 9,954,841 km (0.081 R)
• M30: 10,874,718 km (0.095 R)
• M31: 12,358,579 km (0.11 R)
• M32: 12,848,812 km (0.109 R)
• M33: 12,958,766 km (0.113 R)
• M34: 13,289,976 km (0.084 R)
• M35: 14,700,384 km (0.106 R)
• M36: 14,757,680 km (0.118 R)
• M37: 14,872,721 km (0.106 R)
• M38: 15,219,639 km (0.058 R)
• M39: 15,452,263 km (0.094 R)
• M40: 15,980,194 km (0.049 R)
• M41: 16,394,879 km (0.079 R)
• M42: 16,573,649 km (0.111 R)
• M43: 17,720,915 km (0.106 R)
• M44: 18,088,627 km (0.094 R)
• M45: 20,346,507 km (0.049 R)
• M46: 20,989,329 km (0.117 R)
• M47: 22,957,289 km (0.09 R)
• M48: 23,090,581 km (0.059 R)
• M49: 24,437,560 km (0.084 R)
• M50: 24,914,927 km (0.114 R)
• M51: 25,257,805 km (0.083 R)
• M52: 25,464,250 km (0.097 R)
• M53: 26,575,015 km (0.118 R)
• M54: 26,645,026 km (0.111 R)
• M55: 27,772,396 km (0.056 R)
• M56: 27,985,423 km (0.105 R)
• M57: 28,341,915 km (0.034 R)
• M58: 28,628,096 km (0.077 R)
• M59: 29,059,237 km (0.106 R)
• M60: 29,131,343 km (0.06 R)
• M61: 30,073,510 km (0.086 R)
• M62: 30,584,985 km (0.068 R)
• M63: 30,805,044 km (0.098 R)
• M64: 31,246,806 km (0.081 R)
• M65: 31,320,558 km (0.109 R)
• M66: 31,764,714 km (0.061 R)
• M67: 32,809,356 km (0.091 R)
• M68: 33,789,222 km (0.036 R)
• M69: 33,940,915 km (0.118 R)
• M70: 34,549,628 km (0.073 R)
• M71: 34,702,368 km (0.094 R)
• M72: 34,778,812 km (0.099 R)
• M73: 35,932,361 km (0.083 R)
• M74: 37,333,046 km (0.079 R)
• M75: 38,197,872 km (0.096 R)
• M76: 39,627,130 km (0.072 R)
• M77: 39,947,119 km (0.08 R)
• M78: 41,397,770 km (0.109 R)
• M79: 42,701,515 km (0.105 R)
• M80: 44,267,207 km (0.102 R)
• M81: 45,015,346 km (0.109 R)
• M82: 45,683,899 km (0.108 R)
• M83: 45,767,673 km (0.115 R)
• M84: 47,794,276 km (0.088 R)
• M85: 48,305,452 km (0.039 R)
• M86: 49,247,320 km (0.108 R)
• M87: 50,454,874 km (0.038 R)
• M88: 52,021,612 km (0.072 R)
• M89: 54,135,281 km (0.119 R)
• M90: 56,906,880 km (0.081 R)
• M91: 57,901,257 km (0.118 R)
• M92: 60,090,921 km (0.088 R)

Planet 7 - Ice Giant

Semi-Major Axis: 8.75 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 889

Radius: 6.7

Gravity: 19.8 G

Time & Orbit

Eccentricity (e): 0.114

Orbit Range: 7.75 AU - 9.75 AU

Year: 17260 Days

Day: 17.2 Hours

Environment

Temp: -234 °C

Axial Tilt: 3.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 75,231,257 km

• M1: 102,325 km (0.104 R)
• M2: 398,379 km (0.115 R)
• M3: 473,776 km (0.037 R)
• M4: 575,353 km (0.087 R)
• M5: 800,648 km (0.108 R)
• M6: 1,243,458 km (0.1 R)
• M7: 1,535,173 km (0.072 R)
• M8: 1,751,941 km (0.095 R)
• M9: 1,847,833 km (0.047 R)
• M10: 2,112,322 km (0.116 R)
• M11: 2,495,442 km (0.078 R)
• M12: 3,129,438 km (0.065 R)
• M13: 3,207,229 km (0.055 R)
• M14: 3,404,399 km (0.114 R)
• M15: 3,646,448 km (0.089 R)
• M16: 3,852,295 km (0.102 R)
• M17: 3,977,658 km (0.074 R)
• M18: 4,232,573 km (0.113 R)
• M19: 4,318,741 km (0.108 R)
• M20: 4,713,530 km (0.088 R)
• M21: 4,847,719 km (0.092 R)
• M22: 4,937,927 km (0.098 R)
• M23: 7,418,708 km (0.096 R)
• M24: 7,470,618 km (0.097 R)
• M25: 7,890,689 km (0.03 R)
• M26: 9,029,578 km (0.108 R)
• M27: 10,334,819 km (0.075 R)
• M28: 11,098,367 km (0.104 R)
• M29: 11,336,975 km (0.081 R)
• M30: 11,697,955 km (0.074 R)
• M31: 11,879,866 km (0.077 R)
• M32: 12,308,165 km (0.087 R)
• M33: 12,866,015 km (0.086 R)
• M34: 12,991,229 km (0.087 R)
• M35: 13,559,252 km (0.047 R)
• M36: 13,686,560 km (0.07 R)
• M37: 13,878,344 km (0.102 R)
• M38: 13,942,372 km (0.05 R)
• M39: 14,199,830 km (0.118 R)
• M40: 15,710,469 km (0.088 R)
• M41: 15,911,230 km (0.103 R)
• M42: 17,340,338 km (0.095 R)
• M43: 18,668,318 km (0.074 R)
• M44: 18,809,987 km (0.073 R)
• M45: 19,165,731 km (0.101 R)
• M46: 19,523,719 km (0.12 R)
• M47: 20,464,839 km (0.099 R)
• M48: 22,165,917 km (0.095 R)
• M49: 23,375,714 km (0.027 R)
• M50: 23,911,873 km (0.11 R)
• M51: 23,988,767 km (0.112 R)
• M52: 26,175,289 km (0.112 R)
• M53: 26,254,576 km (0.065 R)
• M54: 29,407,650 km (0.068 R)
• M55: 32,167,581 km (0.113 R)
• M56: 33,880,028 km (0.075 R)
• M57: 33,966,346 km (0.076 R)
• M58: 34,052,814 km (0.079 R)
• M59: 34,226,048 km (0.035 R)
• M60: 34,312,815 km (0.068 R)
• M61: 34,399,582 km (0.115 R)
• M62: 35,621,946 km (0.045 R)
• M63: 37,392,736 km (0.059 R)
• M64: 37,571,356 km (0.082 R)
• M65: 38,829,923 km (0.11 R)
• M66: 39,919,593 km (0.111 R)
• M67: 40,285,061 km (0.118 R)
• M68: 40,468,169 km (0.088 R)
• M69: 41,943,353 km (0.04 R)
• M70: 42,874,301 km (0.097 R)
• M71: 42,967,800 km (0.051 R)
• M72: 43,342,243 km (0.079 R)
• M73: 45,421,504 km (0.103 R)
• M74: 45,707,535 km (0.056 R)
• M75: 46,953,984 km (0.119 R)
• M76: 47,726,657 km (0.118 R)
• M77: 49,774,503 km (0.111 R)
• M78: 51,552,623 km (0.079 R)
• M79: 54,663,361 km (0.102 R)
• M80: 55,475,977 km (0.068 R)
• M81: 57,113,176 km (0.117 R)
• M82: 62,118,870 km (0.101 R)
• M83: 65,856,423 km (0.088 R)
• M84: 66,612,641 km (0.053 R)
• M85: 69,446,623 km (0.081 R)
• M86: 69,666,232 km (0.047 R)
• M87: 71,320,785 km (0.079 R)
• M88: 71,542,339 km (0.048 R)
• M89: 71,986,196 km (0.115 R)
• M90: 74,106,896 km (0.044 R)
• M91: 74,219,094 km (0.04 R)
• M92: 74,555,988 km (0.067 R)

Kuiper Belt

Range: 30 - 60 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 271 - 18,211 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit