🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.26 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.52 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 864.9

Radius: 9.6

Gravity: 9.38 G

Time & Orbit

Eccentricity (e): 0.058

Orbit Range: 0.49 AU - 0.55 AU

Year: 254 Days

Day: 14.1 Hours

Environment

Temp: -140 °C

Axial Tilt: 17.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (41)

Outer Limit: 61,944,660 km

• M1: 123,119 km (0.108 R)
• M2: 198,367 km (0.066 R)
• M3: 296,204 km (0.117 R)
• M4: 367,712 km (0.1 R)
• M5: 452,384 km (0.096 R)
• M6: 606,769 km (0.114 R)
• M7: 690,843 km (0.085 R)
• M8: 800,498 km (0.112 R)
• M9: 897,737 km (0.109 R)
• M10: 964,906 km (0.103 R)
• M11: 1,034,020 km (0.116 R)
• M12: 1,157,140 km (0.107 R)
• M13: 1,230,891 km (0.105 R)
• M14: 1,379,292 km (0.083 R)
• M15: 1,444,667 km (0.104 R)
• M16: 1,511,088 km (0.098 R)
• M17: 1,587,832 km (0.062 R)
• M18: 1,754,633 km (0.113 R)
• M19: 1,845,140 km (0.086 R)
• M20: 1,927,419 km (0.055 R)
• M21: 2,070,734 km (0.113 R)
• M22: 2,166,476 km (0.034 R)
• M23: 2,238,134 km (0.118 R)
• M24: 2,305,303 km (0.064 R)
• M25: 2,462,979 km (0.079 R)
• M26: 2,608,089 km (0.119 R)
• M27: 2,684,384 km (0.062 R)
• M28: 2,856,272 km (0.112 R)
• M29: 2,918,056 km (0.072 R)
• M30: 3,048,805 km (0.113 R)
• M31: 3,146,791 km (0.071 R)
• M32: 3,304,467 km (0.11 R)
• M33: 3,399,163 km (0.054 R)
• M34: 3,464,836 km (0.111 R)
• M35: 3,549,060 km (0.112 R)
• M36: 3,768,670 km (0.111 R)
• M37: 3,930,086 km (0.049 R)
• M38: 4,036,899 km (0.113 R)
• M39: 4,247,084 km (0.066 R)
• M40: 4,317,993 km (0.064 R)
• M41: 4,389,202 km (0.091 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 158.8

Radius: 15

Gravity: 0.71 G

Time & Orbit

Eccentricity (e): 0.123

Orbit Range: 0.47 AU - 0.61 AU

Year: 269 Days

Day: 7.3 Hours

Environment

Temp: -147 °C

Axial Tilt: 27.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (20)

Outer Limit: 61,944,660 km

• M1: 187,745 km (0.079 R)
• M2: 283,638 km (0.055 R)
• M3: 394,938 km (0.12 R)
• M4: 497,413 km (0.1 R)
• M5: 598,541 km (0.084 R)
• M6: 702,063 km (0.091 R)
• M7: 822,339 km (0.115 R)
• M8: 923,617 km (0.099 R)
• M9: 1,029,682 km (0.038 R)
• M10: 1,172,698 km (0.032 R)
• M11: 1,366,277 km (0.071 R)
• M12: 1,501,514 km (0.118 R)
• M13: 1,619,846 km (0.072 R)
• M14: 1,719,628 km (0.073 R)
• M15: 1,844,093 km (0.072 R)
• M16: 1,958,535 km (0.066 R)
• M17: 2,099,157 km (0.104 R)
• M18: 2,271,195 km (0.063 R)
• M19: 2,387,432 km (0.042 R)
• M20: 2,523,866 km (0.098 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.57 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 53.3

Radius: 13.3

Gravity: 0.3 G

Time & Orbit

Eccentricity (e): 0.212

Orbit Range: 0.45 AU - 0.69 AU

Year: 292 Days

Day: 7.5 Hours

Environment

Temp: -141 °C

Axial Tilt: 11.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (15)

Outer Limit: 61,944,660 km

• M1: 165,455 km (0.097 R)
• M2: 257,308 km (0.088 R)
• M3: 348,563 km (0.111 R)
• M4: 436,826 km (0.093 R)
• M5: 572,960 km (0.107 R)
• M6: 670,946 km (0.099 R)
• M7: 865,723 km (0.043 R)
• M8: 959,371 km (0.109 R)
• M9: 1,048,531 km (0.113 R)
• M10: 1,138,589 km (0.042 R)
• M11: 1,265,299 km (0.042 R)
• M12: 1,385,426 km (0.1 R)
• M13: 1,605,335 km (0.108 R)
• M14: 1,705,865 km (0.037 R)
• M15: 1,798,166 km (0.098 R)

Planet 4 - Gas Giant

Semi-Major Axis: 0.82 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 980.8

Radius: 14.5

Gravity: 4.66 G

Time & Orbit

Eccentricity (e): 0.181

Orbit Range: 0.67 AU - 0.97 AU

Year: 504 Days

Day: 11.3 Hours

Environment

Temp: -158 °C

Axial Tilt: 13.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (50)

Outer Limit: 61,944,660 km

• M1: 181,013 km (0.089 R)
• M2: 275,559 km (0.102 R)
• M3: 380,876 km (0.119 R)
• M4: 521,049 km (0.109 R)
• M5: 711,039 km (0.094 R)
• M6: 876,943 km (0.105 R)
• M7: 983,456 km (0.054 R)
• M8: 1,105,827 km (0.047 R)
• M9: 1,199,925 km (0.101 R)
• M10: 1,373,159 km (0.118 R)
• M11: 1,475,334 km (0.053 R)
• M12: 1,580,202 km (0.08 R)
• M13: 1,707,061 km (0.113 R)
• M14: 1,877,304 km (0.092 R)
• M15: 1,985,014 km (0.097 R)
• M16: 2,143,737 km (0.118 R)
• M17: 2,242,472 km (0.101 R)
• M18: 2,342,703 km (0.06 R)
• M19: 2,600,460 km (0.069 R)
• M20: 2,798,079 km (0.042 R)
• M21: 2,961,439 km (0.072 R)
• M22: 3,056,284 km (0.056 R)
• M23: 3,168,184 km (0.115 R)
• M24: 3,346,953 km (0.119 R)
• M25: 3,445,837 km (0.062 R)
• M26: 3,706,138 km (0.107 R)
• M27: 4,007,877 km (0.077 R)
• M28: 4,380,674 km (0.073 R)
• M29: 4,498,408 km (0.117 R)
• M30: 4,663,265 km (0.102 R)
• M31: 4,774,266 km (0.059 R)
• M32: 4,886,166 km (0.108 R)
• M33: 5,036,661 km (0.037 R)
• M34: 5,188,802 km (0.111 R)
• M35: 5,381,185 km (0.06 R)
• M36: 5,497,871 km (0.092 R)
• M37: 5,625,030 km (0.108 R)
• M38: 5,733,488 km (0.067 R)
• M39: 5,842,694 km (0.059 R)
• M40: 6,063,202 km (0.068 R)
• M41: 6,164,330 km (0.085 R)
• M42: 6,276,229 km (0.119 R)
• M43: 6,399,049 km (0.037 R)
• M44: 6,626,438 km (0.112 R)
• M45: 6,741,179 km (0.102 R)
• M46: 6,846,047 km (0.117 R)
• M47: 6,983,229 km (0.077 R)
• M48: 7,142,550 km (0.089 R)
• M49: 7,238,891 km (0.119 R)
• M50: 7,367,845 km (0.103 R)

Planet 5 - Gas Giant

Semi-Major Axis: 1.28 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 249.9

Radius: 8.4

Gravity: 3.54 G

Time & Orbit

Eccentricity (e): 0.126

Orbit Range: 1.12 AU - 1.44 AU

Year: 982 Days

Day: 5.2 Hours

Environment

Temp: -191 °C

Axial Tilt: 3.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 61,944,660 km

• M1: 106,214 km (0.112 R)
• M2: 212,728 km (0.074 R)
• M3: 335,099 km (0.078 R)
• M4: 403,166 km (0.089 R)
• M5: 505,342 km (0.118 R)
• M6: 577,448 km (0.091 R)
• M7: 756,965 km (0.092 R)
• M8: 810,970 km (0.098 R)
• M9: 923,168 km (0.042 R)
• M10: 1,035,367 km (0.093 R)
• M11: 1,112,709 km (0.104 R)
• M12: 1,186,461 km (0.068 R)
• M13: 1,256,024 km (0.096 R)
• M14: 1,320,949 km (0.118 R)
• M15: 1,381,088 km (0.103 R)
• M16: 1,535,473 km (0.115 R)
• M17: 1,637,498 km (0.117 R)
• M18: 1,715,289 km (0.091 R)
• M19: 1,821,204 km (0.111 R)
• M20: 1,984,266 km (0.065 R)
• M21: 2,095,717 km (0.033 R)
• M22: 2,166,327 km (0.057 R)
• M23: 2,223,473 km (0.111 R)
• M24: 2,288,399 km (0.114 R)
• M25: 2,434,855 km (0.115 R)
• M26: 2,546,904 km (0.078 R)
• M27: 2,630,080 km (0.084 R)
• M28: 2,698,895 km (0.118 R)
• M29: 2,877,365 km (0.083 R)
• M30: 2,972,061 km (0.099 R)
• M31: 3,083,960 km (0.04 R)
• M32: 3,148,437 km (0.081 R)
• M33: 3,287,114 km (0.061 R)
• M34: 3,562,075 km (0.118 R)
• M35: 3,621,465 km (0.052 R)
• M36: 3,879,372 km (0.116 R)
• M37: 4,019,396 km (0.115 R)
• M38: 4,241,548 km (0.108 R)
• M39: 4,349,558 km (0.116 R)
• M40: 4,513,368 km (0.088 R)
• M41: 4,623,771 km (0.076 R)
• M42: 4,735,072 km (0.117 R)
• M43: 4,931,943 km (0.109 R)
• M44: 5,131,506 km (0.096 R)
• M45: 5,304,740 km (0.046 R)
• M46: 5,460,472 km (0.054 R)
• M47: 5,607,676 km (0.068 R)
• M48: 5,796,170 km (0.038 R)
• M49: 5,926,320 km (0.098 R)
• M50: 6,067,540 km (0.118 R)
• M51: 6,332,777 km (0.117 R)
• M52: 6,601,904 km (0.095 R)
• M53: 6,685,529 km (0.11 R)
• M54: 6,906,634 km (0.079 R)
• M55: 7,183,690 km (0.076 R)

Planet 6 - Gas Giant

Semi-Major Axis: 1.3 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 533.2

Radius: 9.5

Gravity: 5.91 G

Time & Orbit

Eccentricity (e): 0.019

Orbit Range: 1.28 AU - 1.32 AU

Year: 1005 Days

Day: 6.4 Hours

Environment

Temp: -189 °C

Axial Tilt: 36.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (64)

Outer Limit: 61,944,660 km

• M1: 118,930 km (0.076 R)
• M2: 242,947 km (0.1 R)
• M3: 335,249 km (0.064 R)
• M4: 407,056 km (0.08 R)
• M5: 509,530 km (0.115 R)
• M6: 654,191 km (0.094 R)
• M7: 743,501 km (0.073 R)
• M8: 979,268 km (0.048 R)
• M9: 1,069,924 km (0.096 R)
• M10: 1,143,077 km (0.094 R)
• M11: 1,380,788 km (0.101 R)
• M12: 1,475,933 km (0.059 R)
• M13: 1,565,691 km (0.114 R)
• M14: 1,822,401 km (0.107 R)
• M15: 1,911,113 km (0.086 R)
• M16: 2,075,970 km (0.103 R)
• M17: 2,151,816 km (0.04 R)
• M18: 2,219,883 km (0.116 R)
• M19: 2,376,063 km (0.081 R)
• M20: 2,473,302 km (0.091 R)
• M21: 2,535,834 km (0.11 R)
• M22: 2,689,919 km (0.062 R)
• M23: 2,772,946 km (0.06 R)
• M24: 2,922,394 km (0.103 R)
• M25: 3,036,388 km (0.097 R)
• M26: 3,200,347 km (0.052 R)
• M27: 3,357,425 km (0.041 R)
• M28: 3,436,861 km (0.081 R)
• M29: 3,547,265 km (0.076 R)
• M30: 3,699,555 km (0.11 R)
• M31: 3,937,566 km (0.102 R)
• M32: 4,084,770 km (0.115 R)
• M33: 4,169,741 km (0.059 R)
• M34: 4,352,400 km (0.12 R)
• M35: 4,526,682 km (0.105 R)
• M36: 4,703,357 km (0.06 R)
• M37: 4,792,517 km (0.066 R)
• M38: 4,983,853 km (0.082 R)
• M39: 5,052,070 km (0.104 R)
• M40: 5,432,497 km (0.031 R)
• M41: 5,549,632 km (0.112 R)
• M42: 5,798,413 km (0.059 R)
• M43: 5,942,177 km (0.069 R)
• M44: 6,148,024 km (0.104 R)
• M45: 6,331,431 km (0.05 R)
• M46: 6,405,482 km (0.117 R)
• M47: 6,529,199 km (0.101 R)
• M48: 6,741,628 km (0.075 R)
• M49: 6,829,741 km (0.084 R)
• M50: 6,905,587 km (0.06 R)
• M51: 7,147,637 km (0.067 R)
• M52: 7,211,814 km (0.114 R)
• M53: 7,314,737 km (0.03 R)
• M54: 7,705,637 km (0.044 R)
• M55: 7,890,390 km (0.075 R)
• M56: 8,170,288 km (0.107 R)
• M57: 8,291,163 km (0.111 R)
• M58: 8,507,631 km (0.038 R)
• M59: 8,643,915 km (0.069 R)
• M60: 8,835,998 km (0.099 R)
• M61: 8,946,252 km (0.059 R)
• M62: 9,098,842 km (0.111 R)
• M63: 9,364,228 km (0.117 R)
• M64: 9,434,539 km (0.083 R)

Planet 7 - Gas Giant

Semi-Major Axis: 2.65 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 222.9

Radius: 12.5

Gravity: 1.43 G

Time & Orbit

Eccentricity (e): 0.048

Orbit Range: 2.52 AU - 2.78 AU

Year: 2926 Days

Day: 10.9 Hours

Environment

Temp: -214 °C

Axial Tilt: 11.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 61,944,660 km

• M1: 165,754 km (0.049 R)
• M2: 288,125 km (0.03 R)
• M3: 499,208 km (0.082 R)
• M4: 603,179 km (0.079 R)
• M5: 716,125 km (0.104 R)
• M6: 973,882 km (0.113 R)
• M7: 1,101,489 km (0.078 R)
• M8: 1,280,857 km (0.104 R)
• M9: 1,470,248 km (0.094 R)
• M10: 1,730,698 km (0.114 R)
• M11: 1,930,860 km (0.099 R)
• M12: 2,072,230 km (0.118 R)
• M13: 2,161,091 km (0.084 R)
• M14: 2,239,779 km (0.097 R)
• M15: 2,529,401 km (0.037 R)
• M16: 2,696,801 km (0.091 R)
• M17: 2,930,173 km (0.044 R)
• M18: 3,183,143 km (0.12 R)
• M19: 3,390,785 km (0.108 R)
• M20: 3,496,252 km (0.118 R)
• M21: 3,697,012 km (0.068 R)
• M22: 3,929,338 km (0.101 R)
• M23: 4,166,450 km (0.091 R)
• M24: 4,251,272 km (0.067 R)
• M25: 4,509,329 km (0.103 R)
• M26: 4,713,530 km (0.062 R)
• M27: 4,846,522 km (0.096 R)
• M28: 4,950,942 km (0.081 R)
• M29: 5,176,984 km (0.12 R)
• M30: 5,375,650 km (0.079 R)
• M31: 5,499,218 km (0.118 R)
• M32: 5,608,125 km (0.116 R)
• M33: 5,971,049 km (0.1 R)
• M34: 6,131,119 km (0.045 R)
• M35: 6,357,910 km (0.114 R)
• M36: 6,686,576 km (0.077 R)
• M37: 6,819,718 km (0.089 R)
• M38: 7,190,122 km (0.117 R)
• M39: 7,292,298 km (0.097 R)
• M40: 7,515,498 km (0.074 R)
• M41: 8,021,288 km (0.078 R)
• M42: 8,109,701 km (0.083 R)
• M43: 8,466,342 km (0.088 R)
• M44: 8,556,400 km (0.03 R)
• M45: 8,646,607 km (0.087 R)
• M46: 8,846,470 km (0.113 R)
• M47: 8,937,725 km (0.119 R)
• M48: 9,102,881 km (0.059 R)
• M49: 9,269,084 km (0.101 R)
• M50: 9,623,332 km (0.105 R)
• M51: 10,134,358 km (0.114 R)
• M52: 10,383,588 km (0.112 R)
• M53: 10,479,929 km (0.066 R)
• M54: 10,771,047 km (0.068 R)
• M55: 10,927,227 km (0.068 R)
• M56: 11,104,052 km (0.083 R)
• M57: 11,500,187 km (0.119 R)
• M58: 11,800,430 km (0.104 R)
• M59: 12,022,283 km (0.039 R)
• M60: 12,306,519 km (0.054 R)
• M61: 12,552,009 km (0.106 R)
• M62: 12,737,212 km (0.119 R)
• M63: 12,881,873 km (0.09 R)
• M64: 13,047,777 km (0.095 R)
• M65: 13,298,204 km (0.105 R)
• M66: 13,486,996 km (0.111 R)
• M67: 13,592,313 km (0.061 R)
• M68: 13,803,695 km (0.104 R)
• M69: 14,186,815 km (0.085 R)
• M70: 14,336,862 km (0.047 R)
• M71: 14,422,731 km (0.058 R)

Planet 8 - Ice Giant

Semi-Major Axis: 6.9 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 978.3

Radius: 6.4

Gravity: 23.88 G

Time & Orbit

Eccentricity (e): 0.179

Orbit Range: 5.66 AU - 8.14 AU

Year: 12293 Days

Day: 23.6 Hours

Environment

Temp: -228 °C

Axial Tilt: 10.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 61,944,660 km

• M1: 484,697 km (0.091 R)
• M2: 593,156 km (0.086 R)
• M3: 1,011,581 km (0.114 R)
• M4: 1,176,587 km (0.057 R)
• M5: 2,367,386 km (0.113 R)
• M6: 2,429,619 km (0.058 R)
• M7: 2,846,548 km (0.095 R)
• M8: 3,182,396 km (0.097 R)
• M9: 3,285,618 km (0.113 R)
• M10: 3,390,037 km (0.111 R)
• M11: 3,566,413 km (0.082 R)
• M12: 3,673,675 km (0.113 R)
• M13: 4,225,990 km (0.099 R)
• M14: 5,488,895 km (0.027 R)
• M15: 5,990,647 km (0.073 R)
• M16: 6,594,424 km (0.047 R)
• M17: 7,262,677 km (0.104 R)
• M18: 7,490,216 km (0.12 R)
• M19: 7,905,649 km (0.103 R)
• M20: 8,186,893 km (0.119 R)
• M21: 8,328,712 km (0.12 R)
• M22: 8,662,764 km (0.109 R)
• M23: 9,245,597 km (0.082 R)
• M24: 9,841,146 km (0.1 R)
• M25: 9,991,941 km (0.1 R)
• M26: 10,092,920 km (0.113 R)
• M27: 10,964,926 km (0.113 R)
• M28: 11,016,986 km (0.044 R)
• M29: 11,541,925 km (0.102 R)
• M30: 11,700,947 km (0.094 R)
• M31: 12,128,647 km (0.078 R)
• M32: 12,944,554 km (0.094 R)
• M33: 13,165,061 km (0.078 R)
• M34: 13,386,765 km (0.098 R)
• M35: 13,498,216 km (0.102 R)
• M36: 14,229,450 km (0.099 R)
• M37: 14,400,141 km (0.07 R)
• M38: 14,858,360 km (0.119 R)
• M39: 15,789,008 km (0.077 R)
• M40: 16,083,865 km (0.116 R)
• M41: 16,738,655 km (0.115 R)
• M42: 17,523,745 km (0.062 R)
• M43: 17,890,110 km (0.07 R)
• M44: 18,320,653 km (0.084 R)
• M45: 18,630,320 km (0.118 R)
• M46: 19,759,485 km (0.093 R)
• M47: 19,886,344 km (0.118 R)
• M48: 20,013,502 km (0.068 R)
• M49: 20,268,567 km (0.058 R)
• M50: 21,364,371 km (0.049 R)
• M51: 21,952,141 km (0.109 R)
• M52: 23,143,838 km (0.069 R)
• M53: 23,882,402 km (0.055 R)
• M54: 23,950,021 km (0.039 R)
• M55: 25,107,609 km (0.112 R)
• M56: 25,451,535 km (0.059 R)
• M57: 27,760,428 km (0.045 R)
• M58: 29,119,824 km (0.08 R)
• M59: 31,088,681 km (0.077 R)
• M60: 32,949,679 km (0.051 R)
• M61: 33,552,858 km (0.104 R)
• M62: 35,076,512 km (0.079 R)
• M63: 36,856,427 km (0.116 R)
• M64: 37,482,494 km (0.076 R)
• M65: 38,033,015 km (0.115 R)
• M66: 38,111,853 km (0.102 R)
• M67: 38,983,111 km (0.069 R)
• M68: 39,620,996 km (0.114 R)
• M69: 40,906,790 km (0.117 R)
• M70: 40,987,573 km (0.116 R)
• M71: 41,473,616 km (0.087 R)
• M72: 42,697,027 km (0.099 R)
• M73: 43,684,224 km (0.111 R)
• M74: 44,263,616 km (0.113 R)
• M75: 44,595,873 km (0.083 R)
• M76: 45,765,130 km (0.081 R)
• M77: 47,963,172 km (0.101 R)
• M78: 48,048,443 km (0.082 R)
• M79: 49,763,582 km (0.119 R)
• M80: 50,109,004 km (0.11 R)
• M81: 50,195,471 km (0.077 R)
• M82: 51,062,989 km (0.115 R)
• M83: 51,237,121 km (0.115 R)
• M84: 54,226,984 km (0.118 R)
• M85: 55,116,942 km (0.104 R)
• M86: 55,832,618 km (0.092 R)
• M87: 55,922,227 km (0.119 R)
• M88: 56,551,137 km (0.083 R)
• M89: 56,821,460 km (0.093 R)
• M90: 58,452,077 km (0.095 R)
• M91: 58,634,137 km (0.112 R)
• M92: 58,816,497 km (0.085 R)
• M93: 59,090,411 km (0.115 R)
• M94: 59,273,070 km (0.097 R)
• M95: 60,742,271 km (0.104 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: 277 - 17,551 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit