🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.38 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.76 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 285.9

Radius: 14.4

Gravity: 1.38 G

Time & Orbit

Eccentricity (e): 0.056

Orbit Range: 0.72 AU - 0.8 AU

Year: 435 Days

Day: 8.4 Hours

Environment

Temp: -142 °C

Axial Tilt: 118.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (31)

Outer Limit: 52,154,670 km

• M1: 181,013 km (0.074 R)
• M2: 273,465 km (0.106 R)
• M3: 385,215 km (0.115 R)
• M4: 490,083 km (0.083 R)
• M5: 590,912 km (0.094 R)
• M6: 703,858 km (0.057 R)
• M7: 815,458 km (0.115 R)
• M8: 944,711 km (0.116 R)
• M9: 1,051,374 km (0.087 R)
• M10: 1,154,896 km (0.075 R)
• M11: 1,262,157 km (0.097 R)
• M12: 1,453,194 km (0.112 R)
• M13: 1,552,527 km (0.081 R)
• M14: 1,676,843 km (0.095 R)
• M15: 1,818,661 km (0.083 R)
• M16: 1,959,732 km (0.099 R)
• M17: 2,065,647 km (0.045 R)
• M18: 2,183,531 km (0.062 R)
• M19: 2,308,894 km (0.086 R)
• M20: 2,410,919 km (0.115 R)
• M21: 2,514,591 km (0.066 R)
• M22: 2,683,636 km (0.089 R)
• M23: 2,785,812 km (0.096 R)
• M24: 2,961,140 km (0.113 R)
• M25: 3,293,846 km (0.109 R)
• M26: 3,444,491 km (0.106 R)
• M27: 3,627,150 km (0.071 R)
• M28: 3,849,452 km (0.119 R)
• M29: 3,953,124 km (0.086 R)
• M30: 4,213,424 km (0.074 R)
• M31: 4,358,235 km (0.106 R)

Planet 2 - Gas Giant

Semi-Major Axis: 3.29 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 263.6

Radius: 14.7

Gravity: 1.22 G

Time & Orbit

Eccentricity (e): 0.076

Orbit Range: 3.04 AU - 3.54 AU

Year: 3915 Days

Day: 6.9 Hours

Environment

Temp: -203 °C

Axial Tilt: 7.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 52,154,670 km

• M1: 227,389 km (0.081 R)
• M2: 427,700 km (0.047 R)
• M3: 723,754 km (0.037 R)
• M4: 847,622 km (0.115 R)
• M5: 989,440 km (0.11 R)
• M6: 1,299,258 km (0.036 R)
• M7: 1,512,135 km (0.047 R)
• M8: 1,629,121 km (0.119 R)
• M9: 1,773,632 km (0.092 R)
• M10: 2,024,508 km (0.078 R)
• M11: 2,287,501 km (0.088 R)
• M12: 2,450,712 km (0.059 R)
• M13: 2,575,776 km (0.044 R)
• M14: 2,890,829 km (0.1 R)
• M15: 3,023,373 km (0.102 R)
• M16: 3,264,226 km (0.094 R)
• M17: 3,527,069 km (0.119 R)
• M18: 3,685,044 km (0.108 R)
• M19: 3,894,033 km (0.118 R)
• M20: 4,024,632 km (0.105 R)
• M21: 4,476,417 km (0.077 R)
• M22: 4,962,161 km (0.053 R)
• M23: 5,247,445 km (0.109 R)
• M24: 5,796,917 km (0.053 R)
• M25: 5,909,116 km (0.114 R)
• M26: 6,040,912 km (0.026 R)
• M27: 6,211,752 km (0.119 R)
• M28: 6,616,863 km (0.075 R)
• M29: 6,714,551 km (0.093 R)
• M30: 7,010,755 km (0.047 R)
• M31: 7,210,617 km (0.081 R)
• M32: 7,987,180 km (0.07 R)
• M33: 8,091,450 km (0.107 R)
• M34: 8,449,138 km (0.12 R)
• M35: 8,597,988 km (0.072 R)
• M36: 8,747,586 km (0.083 R)
• M37: 9,931,503 km (0.042 R)
• M38: 10,156,349 km (0.074 R)
• M39: 10,269,295 km (0.091 R)
• M40: 10,428,318 km (0.092 R)
• M41: 10,542,312 km (0.049 R)
• M42: 10,979,586 km (0.054 R)
• M43: 11,824,365 km (0.088 R)
• M44: 11,967,082 km (0.057 R)
• M45: 12,182,503 km (0.064 R)
• M46: 12,447,440 km (0.09 R)
• M47: 12,689,939 km (0.086 R)
• M48: 12,983,150 km (0.085 R)
• M49: 13,377,490 km (0.103 R)
• M50: 13,725,754 km (0.052 R)
• M51: 13,951,198 km (0.084 R)
• M52: 14,077,160 km (0.079 R)
• M53: 14,405,976 km (0.12 R)
• M54: 14,584,147 km (0.089 R)
• M55: 14,814,228 km (0.104 R)
• M56: 15,304,161 km (0.1 R)
• M57: 15,537,983 km (0.117 R)
• M58: 15,746,971 km (0.1 R)
• M59: 16,193,970 km (0.12 R)
• M60: 16,432,429 km (0.048 R)
• M61: 17,208,393 km (0.051 R)
• M62: 17,641,778 km (0.117 R)
• M63: 17,832,365 km (0.093 R)
• M64: 18,270,837 km (0.12 R)
• M65: 18,519,169 km (0.082 R)

Planet 3 - Gas Giant

Semi-Major Axis: 3.8 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 583.3

Radius: 11.5

Gravity: 4.41 G

Time & Orbit

Eccentricity (e): 0.054

Orbit Range: 3.59 AU - 4.01 AU

Year: 4859 Days

Day: 14.2 Hours

Environment

Temp: -205 °C

Axial Tilt: 1.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 52,154,670 km

• M1: 147,653 km (0.084 R)
• M2: 409,749 km (0.104 R)
• M3: 483,949 km (0.101 R)
• M4: 627,563 km (0.107 R)
• M5: 705,354 km (0.115 R)
• M6: 910,004 km (0.119 R)
• M7: 1,026,541 km (0.076 R)
• M8: 1,407,566 km (0.088 R)
• M9: 1,701,676 km (0.052 R)
• M10: 1,881,044 km (0.098 R)
• M11: 2,276,580 km (0.101 R)
• M12: 2,755,294 km (0.084 R)
• M13: 2,831,738 km (0.116 R)
• M14: 3,285,319 km (0.105 R)
• M15: 3,656,322 km (0.092 R)
• M16: 3,804,274 km (0.1 R)
• M17: 4,040,938 km (0.115 R)
• M18: 4,194,126 km (0.113 R)
• M19: 4,349,109 km (0.046 R)
• M20: 4,872,253 km (0.043 R)
• M21: 4,988,640 km (0.059 R)
• M22: 5,153,198 km (0.08 R)
• M23: 5,487,549 km (0.035 R)
• M24: 5,657,492 km (0.117 R)
• M25: 6,152,661 km (0.12 R)
• M26: 6,228,208 km (0.098 R)
• M27: 6,869,235 km (0.095 R)
• M28: 7,105,300 km (0.113 R)
• M29: 7,477,650 km (0.074 R)
• M30: 7,558,432 km (0.084 R)
• M31: 7,774,901 km (0.083 R)
• M32: 7,883,957 km (0.071 R)
• M33: 8,020,839 km (0.103 R)
• M34: 8,297,296 km (0.083 R)
• M35: 8,944,905 km (0.119 R)
• M36: 9,174,089 km (0.049 R)
• M37: 9,347,174 km (0.069 R)
• M38: 9,784,748 km (0.102 R)
• M39: 10,050,434 km (0.039 R)
• M40: 10,984,074 km (0.051 R)
• M41: 11,601,165 km (0.118 R)
• M42: 12,197,762 km (0.055 R)
• M43: 12,515,956 km (0.049 R)
• M44: 12,740,203 km (0.106 R)
• M45: 13,160,274 km (0.087 R)
• M46: 14,246,953 km (0.099 R)
• M47: 14,851,777 km (0.099 R)
• M48: 15,123,447 km (0.112 R)
• M49: 15,328,097 km (0.036 R)
• M50: 16,575,893 km (0.117 R)
• M51: 17,140,774 km (0.081 R)
• M52: 17,640,431 km (0.081 R)
• M53: 18,326,038 km (0.096 R)
• M54: 18,690,459 km (0.114 R)
• M55: 19,389,380 km (0.115 R)
• M56: 19,686,182 km (0.072 R)
• M57: 19,947,230 km (0.026 R)
• M58: 20,359,672 km (0.086 R)
• M59: 20,812,804 km (0.101 R)
• M60: 22,775,677 km (0.077 R)
• M61: 22,853,917 km (0.025 R)
• M62: 23,561,515 km (0.087 R)
• M63: 23,719,790 km (0.089 R)
• M64: 24,316,236 km (0.062 R)
• M65: 24,436,214 km (0.101 R)
• M66: 24,958,011 km (0.118 R)
• M67: 25,564,780 km (0.032 R)
• M68: 25,971,836 km (0.098 R)
• M69: 26,053,666 km (0.063 R)
• M70: 26,176,336 km (0.051 R)
• M71: 26,463,415 km (0.09 R)
• M72: 27,455,398 km (0.07 R)
• M73: 27,580,312 km (0.079 R)
• M74: 27,663,638 km (0.09 R)

Planet 4 - Gas Giant

Semi-Major Axis: 3.83 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 146.7

Radius: 11.8

Gravity: 1.05 G

Time & Orbit

Eccentricity (e): 0.146

Orbit Range: 3.27 AU - 4.39 AU

Year: 4917 Days

Day: 12.9 Hours

Environment

Temp: -212 °C

Axial Tilt: 21.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (48)

Outer Limit: 52,154,670 km

• M1: 243,396 km (0.07 R)
• M2: 407,205 km (0.115 R)
• M3: 578,196 km (0.108 R)
• M4: 855,849 km (0.113 R)
• M5: 1,280,707 km (0.026 R)
• M6: 1,755,381 km (0.12 R)
• M7: 1,913,207 km (0.101 R)
• M8: 2,256,085 km (0.051 R)
• M9: 2,374,866 km (0.118 R)
• M10: 2,522,968 km (0.074 R)
• M11: 2,674,212 km (0.075 R)
• M12: 2,842,659 km (0.06 R)
• M13: 3,058,229 km (0.105 R)
• M14: 3,219,795 km (0.074 R)
• M15: 3,520,935 km (0.093 R)
• M16: 3,752,962 km (0.09 R)
• M17: 3,831,351 km (0.111 R)
• M18: 4,102,273 km (0.054 R)
• M19: 4,379,478 km (0.111 R)
• M20: 4,545,531 km (0.105 R)
• M21: 5,819,656 km (0.11 R)
• M22: 6,205,768 km (0.052 R)
• M23: 6,619,107 km (0.058 R)
• M24: 6,695,402 km (0.084 R)
• M25: 6,848,441 km (0.089 R)
• M26: 7,002,826 km (0.062 R)
• M27: 8,095,190 km (0.037 R)
• M28: 9,049,175 km (0.076 R)
• M29: 9,261,305 km (0.088 R)
• M30: 9,432,295 km (0.078 R)
• M31: 10,236,234 km (0.076 R)
• M32: 11,403,247 km (0.064 R)
• M33: 11,494,801 km (0.103 R)
• M34: 11,701,545 km (0.071 R)
• M35: 12,376,381 km (0.026 R)
• M36: 12,801,539 km (0.083 R)
• M37: 13,739,368 km (0.073 R)
• M38: 14,105,882 km (0.069 R)
• M39: 14,204,168 km (0.116 R)
• M40: 14,302,753 km (0.077 R)
• M41: 14,599,705 km (0.098 R)
• M42: 15,426,981 km (0.05 R)
• M43: 15,680,550 km (0.106 R)
• M44: 16,063,670 km (0.102 R)
• M45: 16,243,636 km (0.116 R)
• M46: 16,372,440 km (0.053 R)
• M47: 16,527,573 km (0.052 R)
• M48: 17,574,010 km (0.118 R)

Planet 5 - Gas Giant

Semi-Major Axis: 4.49 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 260.8

Radius: 10.2

Gravity: 2.51 G

Time & Orbit

Eccentricity (e): 0.102

Orbit Range: 4.03 AU - 4.95 AU

Year: 6241 Days

Day: 7.5 Hours

Environment

Temp: -204 °C

Axial Tilt: 27.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 52,154,670 km

• M1: 148,401 km (0.084 R)
• M2: 666,309 km (0.087 R)
• M3: 831,315 km (0.119 R)
• M4: 901,327 km (0.087 R)
• M5: 1,189,453 km (0.108 R)
• M6: 1,323,792 km (0.105 R)
• M7: 1,477,728 km (0.115 R)
• M8: 1,578,856 km (0.116 R)
• M9: 1,757,775 km (0.095 R)
• M10: 2,022,713 km (0.12 R)
• M11: 2,135,659 km (0.054 R)
• M12: 2,334,176 km (0.1 R)
• M13: 2,452,956 km (0.108 R)
• M14: 2,785,363 km (0.12 R)
• M15: 2,984,478 km (0.032 R)
• M16: 3,244,778 km (0.104 R)
• M17: 3,551,304 km (0.089 R)
• M18: 3,708,082 km (0.095 R)
• M19: 4,028,671 km (0.086 R)
• M20: 4,192,331 km (0.089 R)
• M21: 4,484,196 km (0.055 R)
• M22: 4,653,990 km (0.115 R)
• M23: 4,847,569 km (0.038 R)
• M24: 4,934,336 km (0.108 R)
• M25: 5,354,257 km (0.109 R)
• M26: 5,716,733 km (0.119 R)
• M27: 6,346,540 km (0.034 R)
• M28: 6,561,512 km (0.12 R)
• M29: 6,633,618 km (0.085 R)
• M30: 6,730,259 km (0.037 R)
• M31: 7,369,790 km (0.086 R)
• M32: 7,545,268 km (0.102 R)
• M33: 8,106,110 km (0.068 R)
• M34: 8,892,247 km (0.114 R)
• M35: 9,106,022 km (0.057 R)
• M36: 9,402,825 km (0.114 R)
• M37: 9,730,145 km (0.066 R)
• M38: 10,061,354 km (0.053 R)
• M39: 11,134,270 km (0.042 R)
• M40: 11,480,589 km (0.111 R)
• M41: 11,684,342 km (0.08 R)
• M42: 12,302,630 km (0.112 R)
• M43: 12,991,977 km (0.066 R)
• M44: 13,143,519 km (0.084 R)
• M45: 13,448,250 km (0.112 R)
• M46: 14,096,009 km (0.111 R)
• M47: 14,690,810 km (0.119 R)
• M48: 14,943,780 km (0.084 R)
• M49: 15,486,072 km (0.106 R)
• M50: 16,132,186 km (0.076 R)
• M51: 16,295,098 km (0.112 R)
• M52: 16,524,132 km (0.089 R)
• M53: 16,820,186 km (0.088 R)
• M54: 17,151,246 km (0.11 R)
• M55: 17,450,891 km (0.117 R)
• M56: 18,089,375 km (0.046 R)
• M57: 18,394,554 km (0.102 R)
• M58: 18,530,688 km (0.11 R)
• M59: 18,667,271 km (0.091 R)
• M60: 18,941,185 km (0.06 R)
• M61: 19,044,258 km (0.03 R)
• M62: 19,147,630 km (0.103 R)
• M63: 19,216,594 km (0.101 R)
• M64: 19,320,116 km (0.094 R)
• M65: 19,458,494 km (0.064 R)
• M66: 19,597,321 km (0.076 R)
• M67: 19,806,010 km (0.117 R)
• M68: 20,015,447 km (0.095 R)
• M69: 20,190,626 km (0.113 R)
• M70: 20,295,943 km (0.085 R)
• M71: 20,401,410 km (0.106 R)
• M72: 20,683,701 km (0.111 R)
• M73: 20,825,370 km (0.12 R)
• M74: 20,931,734 km (0.087 R)
• M75: 21,145,061 km (0.075 R)
• M76: 21,252,023 km (0.093 R)
• M77: 21,717,721 km (0.119 R)
• M78: 22,186,561 km (0.062 R)
• M79: 22,622,489 km (0.115 R)
• M80: 25,145,308 km (0.053 R)
• M81: 25,334,399 km (0.026 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.65 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 30.3

Radius: 14.3

Gravity: 0.15 G

Time & Orbit

Eccentricity (e): 0.084

Orbit Range: 4.26 AU - 5.04 AU

Year: 6578 Days

Day: 8.3 Hours

Environment

Temp: -214 °C

Axial Tilt: 22.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (31)

Outer Limit: 52,154,670 km

• M1: 182,360 km (0.047 R)
• M2: 327,769 km (0.116 R)
• M3: 736,620 km (0.104 R)
• M4: 875,896 km (0.12 R)
• M5: 1,009,935 km (0.075 R)
• M6: 1,208,452 km (0.115 R)
• M7: 2,121,896 km (0.093 R)
• M8: 2,255,487 km (0.058 R)
• M9: 2,498,883 km (0.114 R)
• M10: 2,897,561 km (0.111 R)
• M11: 3,424,594 km (0.092 R)
• M12: 3,855,586 km (0.085 R)
• M13: 4,084,022 km (0.038 R)
• M14: 4,369,455 km (0.09 R)
• M15: 4,567,821 km (0.101 R)
• M16: 4,877,938 km (0.106 R)
• M17: 5,028,732 km (0.04 R)
• M18: 5,264,947 km (0.061 R)
• M19: 6,335,470 km (0.037 R)
• M20: 7,314,737 km (0.081 R)
• M21: 7,838,180 km (0.111 R)
• M22: 7,999,148 km (0.093 R)
• M23: 9,326,978 km (0.099 R)
• M24: 9,964,116 km (0.058 R)
• M25: 10,086,337 km (0.092 R)
• M26: 10,296,821 km (0.09 R)
• M27: 10,829,689 km (0.066 R)
• M28: 11,153,718 km (0.089 R)
• M29: 11,572,442 km (0.075 R)
• M30: 11,940,752 km (0.056 R)
• M31: 12,425,450 km (0.045 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.75 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 440.5

Radius: 7.6

Gravity: 7.63 G

Time & Orbit

Eccentricity (e): 0.151

Orbit Range: 6.58 AU - 8.92 AU

Year: 14153 Days

Day: 16.3 Hours

Environment

Temp: -222 °C

Axial Tilt: 28.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 52,154,670 km

• M1: 112,946 km (0.111 R)
• M2: 230,830 km (0.092 R)
• M3: 325,525 km (0.106 R)
• M4: 378,632 km (0.096 R)
• M5: 526,734 km (0.096 R)
• M6: 977,173 km (0.033 R)
• M7: 1,523,654 km (0.111 R)
• M8: 2,045,900 km (0.099 R)
• M9: 2,151,367 km (0.102 R)
• M10: 2,562,911 km (0.1 R)
• M11: 2,939,299 km (0.062 R)
• M12: 3,364,157 km (0.11 R)
• M13: 3,457,656 km (0.106 R)
• M14: 3,808,163 km (0.107 R)
• M15: 4,203,551 km (0.103 R)
• M16: 4,577,396 km (0.11 R)
• M17: 5,539,908 km (0.094 R)
• M18: 5,687,861 km (0.099 R)
• M19: 6,602,053 km (0.113 R)
• M20: 6,798,176 km (0.051 R)
• M21: 8,057,042 km (0.094 R)
• M22: 8,140,817 km (0.095 R)
• M23: 8,224,741 km (0.111 R)
• M24: 9,080,142 km (0.108 R)
• M25: 9,562,595 km (0.075 R)
• M26: 9,784,748 km (0.095 R)
• M27: 10,279,318 km (0.068 R)
• M28: 11,954,067 km (0.071 R)
• M29: 12,241,444 km (0.104 R)
• M30: 12,676,624 km (0.101 R)
• M31: 13,067,823 km (0.083 R)
• M32: 13,462,911 km (0.098 R)
• M33: 13,761,807 km (0.095 R)
• M34: 13,912,004 km (0.115 R)
• M35: 14,416,896 km (0.111 R)
• M36: 14,722,674 km (0.09 R)
• M37: 15,288,902 km (0.066 R)
• M38: 15,705,233 km (0.118 R)
• M39: 16,019,838 km (0.108 R)
• M40: 16,177,963 km (0.113 R)
• M41: 17,083,778 km (0.102 R)
• M42: 18,888,377 km (0.111 R)
• M43: 19,278,977 km (0.085 R)
• M44: 20,466,634 km (0.064 R)
• M45: 21,503,348 km (0.091 R)
• M46: 21,969,644 km (0.09 R)
• M47: 24,108,594 km (0.1 R)
• M48: 24,410,932 km (0.083 R)
• M49: 24,836,388 km (0.045 R)
• M50: 25,879,534 km (0.04 R)
• M51: 26,003,102 km (0.108 R)
• M52: 26,624,531 km (0.117 R)
• M53: 28,453,665 km (0.053 R)
• M54: 29,286,775 km (0.041 R)
• M55: 30,649,462 km (0.104 R)
• M56: 31,371,571 km (0.081 R)
• M57: 31,900,100 km (0.051 R)
• M58: 32,099,215 km (0.095 R)
• M59: 32,698,654 km (0.112 R)
• M60: 32,832,245 km (0.094 R)
• M61: 32,966,284 km (0.074 R)
• M62: 33,234,513 km (0.064 R)
• M63: 33,369,002 km (0.12 R)
• M64: 34,587,177 km (0.067 R)
• M65: 34,928,111 km (0.12 R)
• M66: 35,201,576 km (0.057 R)
• M67: 35,270,092 km (0.101 R)
• M68: 37,765,534 km (0.098 R)
• M69: 37,976,167 km (0.107 R)
• M70: 38,046,329 km (0.1 R)
• M71: 38,398,333 km (0.082 R)
• M72: 39,318,360 km (0.097 R)
• M73: 40,820,023 km (0.09 R)
• M74: 40,964,086 km (0.097 R)
• M75: 41,904,159 km (0.119 R)
• M76: 43,364,234 km (0.079 R)
• M77: 44,174,306 km (0.12 R)
• M78: 44,248,208 km (0.083 R)
• M79: 44,989,465 km (0.071 R)
• M80: 45,287,165 km (0.088 R)
• M81: 45,660,112 km (0.079 R)
• M82: 45,959,159 km (0.113 R)
• M83: 46,184,004 km (0.091 R)
• M84: 46,258,953 km (0.079 R)
• M85: 47,388,865 km (0.075 R)
• M86: 47,615,955 km (0.109 R)
• M87: 47,919,340 km (0.109 R)
• M88: 49,292,199 km (0.116 R)
• M89: 51,531,231 km (0.036 R)
• M90: 51,609,021 km (0.05 R)
• M91: 51,842,693 km (0.031 R)

Kuiper Belt

Range: 30 - 49 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 155 - 11,285 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit