🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.57 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 1.14 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 430.8

Radius: 14.4

Gravity: 2.08 G

Time & Orbit

Eccentricity (e): 0.225

Orbit Range: 0.88 AU - 1.4 AU

Year: 840 Days

Day: 7.6 Hours

Environment

Temp: -177 °C

Axial Tilt: 42.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (42)

Outer Limit: 27,610,007 km

• M1: 180,415 km (0.081 R)
• M2: 273,016 km (0.029 R)
• M3: 460,013 km (0.102 R)
• M4: 552,465 km (0.119 R)
• M5: 888,462 km (0.057 R)
• M6: 1,164,619 km (0.116 R)
• M7: 1,307,485 km (0.1 R)
• M8: 1,425,219 km (0.057 R)
• M9: 1,533,677 km (0.054 R)
• M10: 1,665,174 km (0.111 R)
• M11: 1,821,204 km (0.075 R)
• M12: 1,968,259 km (0.027 R)
• M13: 2,418,399 km (0.079 R)
• M14: 2,557,525 km (0.11 R)
• M15: 2,803,614 km (0.026 R)
• M16: 2,966,526 km (0.112 R)
• M17: 3,124,501 km (0.108 R)
• M18: 3,362,212 km (0.109 R)
• M19: 3,588,554 km (0.113 R)
• M20: 3,703,594 km (0.086 R)
• M21: 3,802,030 km (0.12 R)
• M22: 3,955,667 km (0.118 R)
• M23: 4,056,346 km (0.082 R)
• M24: 4,204,299 km (0.076 R)
• M25: 4,354,046 km (0.078 R)
• M26: 4,553,310 km (0.04 R)
• M27: 4,697,672 km (0.12 R)
• M28: 4,794,612 km (0.1 R)
• M29: 5,040,251 km (0.088 R)
• M30: 5,269,884 km (0.077 R)
• M31: 5,360,690 km (0.109 R)
• M32: 5,574,615 km (0.108 R)
• M33: 5,677,538 km (0.117 R)
• M34: 5,822,648 km (0.08 R)
• M35: 5,990,048 km (0.1 R)
• M36: 6,095,515 km (0.068 R)
• M37: 6,512,893 km (0.078 R)
• M38: 6,895,265 km (0.082 R)
• M39: 7,117,268 km (0.037 R)
• M40: 7,465,831 km (0.097 R)
• M41: 7,693,818 km (0.089 R)
• M42: 7,797,191 km (0.11 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.66 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 300.1

Radius: 9

Gravity: 3.7 G

Time & Orbit

Eccentricity (e): 0.162

Orbit Range: 1.39 AU - 1.93 AU

Year: 1476 Days

Day: 9.1 Hours

Environment

Temp: -187 °C

Axial Tilt: 12.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (62)

Outer Limit: 27,610,007 km

• M1: 112,797 km (0.112 R)
• M2: 192,383 km (0.04 R)
• M3: 267,182 km (0.072 R)
• M4: 397,182 km (0.089 R)
• M5: 499,058 km (0.036 R)
• M6: 638,783 km (0.045 R)
• M7: 719,715 km (0.115 R)
• M8: 823,087 km (0.1 R)
• M9: 984,653 km (0.117 R)
• M10: 1,121,535 km (0.108 R)
• M11: 1,178,083 km (0.067 R)
• M12: 1,235,678 km (0.1 R)
• M13: 1,294,321 km (0.106 R)
• M14: 1,354,010 km (0.117 R)
• M15: 1,429,856 km (0.098 R)
• M16: 1,578,108 km (0.072 R)
• M17: 1,642,136 km (0.06 R)
• M18: 1,706,912 km (0.113 R)
• M19: 1,797,568 km (0.066 R)
• M20: 1,872,965 km (0.092 R)
• M21: 2,302,311 km (0.063 R)
• M22: 2,646,686 km (0.052 R)
• M23: 2,703,982 km (0.057 R)
• M24: 2,771,450 km (0.113 R)
• M25: 3,067,205 km (0.118 R)
• M26: 3,259,738 km (0.099 R)
• M27: 3,466,931 km (0.105 R)
• M28: 3,561,477 km (0.039 R)
• M29: 3,678,312 km (0.119 R)
• M30: 3,915,724 km (0.114 R)
• M31: 4,124,862 km (0.11 R)
• M32: 4,360,329 km (0.056 R)
• M33: 4,428,396 km (0.107 R)
• M34: 4,519,800 km (0.037 R)
• M35: 4,577,246 km (0.03 R)
• M36: 4,681,217 km (0.118 R)
• M37: 4,938,675 km (0.085 R)
• M38: 5,033,520 km (0.109 R)
• M39: 5,285,293 km (0.078 R)
• M40: 5,676,790 km (0.074 R)
• M41: 5,926,320 km (0.081 R)
• M42: 6,115,860 km (0.107 R)
• M43: 6,243,318 km (0.076 R)
• M44: 6,513,940 km (0.083 R)
• M45: 6,670,270 km (0.084 R)
• M46: 6,735,794 km (0.079 R)
• M47: 6,841,111 km (0.034 R)
• M48: 6,946,876 km (0.046 R)
• M49: 7,335,083 km (0.1 R)
• M50: 7,443,392 km (0.095 R)
• M51: 7,552,299 km (0.081 R)
• M52: 7,675,418 km (0.107 R)
• M53: 7,757,996 km (0.114 R)
• M54: 7,826,811 km (0.094 R)
• M55: 8,048,814 km (0.098 R)
• M56: 8,499,104 km (0.07 R)
• M57: 8,727,390 km (0.107 R)
• M58: 8,784,686 km (0.111 R)
• M59: 8,914,238 km (0.06 R)
• M60: 9,306,783 km (0.111 R)
• M61: 9,808,983 km (0.059 R)
• M62: 10,123,737 km (0.101 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.94 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 152.3

Radius: 8.1

Gravity: 2.32 G

Time & Orbit

Eccentricity (e): 0.224

Orbit Range: 1.51 AU - 2.37 AU

Year: 1865 Days

Day: 5.3 Hours

Environment

Temp: -205 °C

Axial Tilt: 38.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (43)

Outer Limit: 27,610,007 km

• M1: 121,473 km (0.09 R)
• M2: 184,305 km (0.094 R)
• M3: 438,172 km (0.112 R)
• M4: 565,929 km (0.03 R)
• M5: 640,129 km (0.107 R)
• M6: 695,331 km (0.068 R)
• M7: 1,035,666 km (0.104 R)
• M8: 1,155,494 km (0.053 R)
• M9: 1,251,985 km (0.091 R)
• M10: 1,401,882 km (0.081 R)
• M11: 1,490,294 km (0.109 R)
• M12: 1,790,537 km (0.082 R)
• M13: 1,894,807 km (0.081 R)
• M14: 2,009,548 km (0.084 R)
• M15: 2,411,368 km (0.032 R)
• M16: 2,828,746 km (0.084 R)
• M17: 2,884,845 km (0.117 R)
• M18: 2,950,818 km (0.118 R)
• M19: 3,180,750 km (0.076 R)
• M20: 3,526,620 km (0.089 R)
• M21: 4,211,330 km (0.03 R)
• M22: 4,459,513 km (0.075 R)
• M23: 4,579,939 km (0.109 R)
• M24: 5,049,676 km (0.115 R)
• M25: 5,209,596 km (0.065 R)
• M26: 5,348,124 km (0.057 R)
• M27: 5,628,769 km (0.118 R)
• M28: 5,711,497 km (0.095 R)
• M29: 6,131,568 km (0.094 R)
• M30: 6,611,179 km (0.109 R)
• M31: 7,026,612 km (0.071 R)
• M32: 7,321,021 km (0.059 R)
• M33: 7,398,512 km (0.108 R)
• M34: 7,554,393 km (0.094 R)
• M35: 7,606,603 km (0.114 R)
• M36: 7,869,297 km (0.091 R)
• M37: 8,471,428 km (0.104 R)
• M38: 8,539,196 km (0.073 R)
• M39: 8,784,836 km (0.096 R)
• M40: 8,867,264 km (0.081 R)
• M41: 9,032,869 km (0.075 R)
• M42: 9,157,634 km (0.079 R)
• M43: 9,255,171 km (0.063 R)

Planet 4 - Gas Giant

Semi-Major Axis: 2.03 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 983.1

Radius: 12.2

Gravity: 6.61 G

Time & Orbit

Eccentricity (e): 0.192

Orbit Range: 1.64 AU - 2.42 AU

Year: 1996 Days

Day: 13.7 Hours

Environment

Temp: -203 °C

Axial Tilt: 14.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (62)

Outer Limit: 27,610,007 km

• M1: 207,492 km (0.106 R)
• M2: 287,378 km (0.118 R)
• M3: 605,722 km (0.101 R)
• M4: 688,001 km (0.067 R)
• M5: 884,722 km (0.117 R)
• M6: 1,101,040 km (0.09 R)
• M7: 1,258,716 km (0.093 R)
• M8: 1,390,512 km (0.113 R)
• M9: 1,492,688 km (0.118 R)
• M10: 1,621,043 km (0.047 R)
• M11: 2,482,726 km (0.044 R)
• M12: 2,566,052 km (0.116 R)
• M13: 2,851,036 km (0.08 R)
• M14: 3,086,653 km (0.112 R)
• M15: 3,313,294 km (0.111 R)
• M16: 3,655,723 km (0.105 R)
• M17: 3,831,351 km (0.091 R)
• M18: 4,026,127 km (0.116 R)
• M19: 4,290,916 km (0.037 R)
• M20: 4,750,929 km (0.075 R)
• M21: 4,837,846 km (0.057 R)
• M22: 5,048,779 km (0.12 R)
• M23: 5,191,046 km (0.084 R)
• M24: 5,443,268 km (0.087 R)
• M25: 5,589,126 km (0.064 R)
• M26: 5,717,930 km (0.062 R)
• M27: 5,829,231 km (0.076 R)
• M28: 6,492,248 km (0.104 R)
• M29: 6,589,038 km (0.115 R)
• M30: 6,725,172 km (0.039 R)
• M31: 6,803,412 km (0.118 R)
• M32: 7,099,616 km (0.091 R)
• M33: 7,299,479 km (0.061 R)
• M34: 7,684,244 km (0.117 R)
• M35: 7,889,493 km (0.059 R)
• M36: 8,242,693 km (0.108 R)
• M37: 8,326,468 km (0.046 R)
• M38: 8,431,785 km (0.068 R)
• M39: 8,664,709 km (0.08 R)
• M40: 8,792,764 km (0.101 R)
• M41: 9,072,363 km (0.11 R)
• M42: 9,180,672 km (0.092 R)
• M43: 9,596,105 km (0.06 R)
• M44: 10,833,429 km (0.055 R)
• M45: 11,272,499 km (0.091 R)
• M46: 11,482,534 km (0.065 R)
• M47: 12,001,489 km (0.042 R)
• M48: 12,096,633 km (0.098 R)
• M49: 12,216,013 km (0.076 R)
• M50: 12,915,831 km (0.104 R)
• M51: 13,013,369 km (0.037 R)
• M52: 13,653,498 km (0.111 R)
• M53: 14,002,510 km (0.113 R)
• M54: 14,354,364 km (0.081 R)
• M55: 15,118,361 km (0.119 R)
• M56: 16,420,909 km (0.08 R)
• M57: 16,659,219 km (0.083 R)
• M58: 16,845,319 km (0.101 R)
• M59: 17,139,129 km (0.104 R)
• M60: 17,976,428 km (0.093 R)
• M61: 18,276,821 km (0.113 R)
• M62: 18,441,378 km (0.077 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.47 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 450

Radius: 12.3

Gravity: 2.97 G

Time & Orbit

Eccentricity (e): 0.02

Orbit Range: 2.42 AU - 2.52 AU

Year: 2680 Days

Day: 7.2 Hours

Environment

Temp: -205 °C

Axial Tilt: 36.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 27,610,007 km

• M1: 154,535 km (0.115 R)
• M2: 242,199 km (0.101 R)
• M3: 327,919 km (0.065 R)
• M4: 430,842 km (0.094 R)
• M5: 541,395 km (0.055 R)
• M6: 647,609 km (0.056 R)
• M7: 753,824 km (0.116 R)
• M8: 1,013,825 km (0.066 R)
• M9: 1,091,017 km (0.077 R)
• M10: 1,377,497 km (0.111 R)
• M11: 1,585,887 km (0.091 R)
• M12: 1,665,323 km (0.087 R)
• M13: 1,900,192 km (0.096 R)
• M14: 2,009,548 km (0.099 R)
• M15: 2,234,543 km (0.057 R)
• M16: 2,415,557 km (0.119 R)
• M17: 2,628,435 km (0.06 R)
• M18: 2,931,370 km (0.107 R)
• M19: 3,072,890 km (0.074 R)
• M20: 3,202,142 km (0.055 R)
• M21: 3,526,171 km (0.105 R)
• M22: 3,829,855 km (0.096 R)
• M23: 4,158,073 km (0.103 R)
• M24: 4,414,334 km (0.108 R)
• M25: 4,577,246 km (0.073 R)
• M26: 4,875,395 km (0.053 R)
• M27: 5,162,922 km (0.088 R)
• M28: 5,248,641 km (0.075 R)
• M29: 5,825,790 km (0.112 R)
• M30: 5,950,854 km (0.045 R)
• M31: 6,221,925 km (0.118 R)
• M32: 6,533,986 km (0.115 R)
• M33: 7,059,374 km (0.075 R)
• M34: 7,308,006 km (0.09 R)
• M35: 7,617,972 km (0.11 R)
• M36: 7,754,854 km (0.119 R)
• M37: 8,250,771 km (0.05 R)
• M38: 8,472,326 km (0.109 R)
• M39: 8,695,675 km (0.101 R)
• M40: 8,859,485 km (0.065 R)
• M41: 9,044,986 km (0.1 R)
• M42: 9,210,890 km (0.093 R)
• M43: 9,377,842 km (0.085 R)
• M44: 10,793,486 km (0.086 R)
• M45: 11,102,256 km (0.08 R)
• M46: 11,280,128 km (0.1 R)
• M47: 11,458,748 km (0.112 R)
• M48: 11,841,719 km (0.107 R)
• M49: 12,160,362 km (0.101 R)
• M50: 12,389,696 km (0.069 R)
• M51: 12,666,751 km (0.096 R)
• M52: 13,273,969 km (0.118 R)
• M53: 13,557,457 km (0.092 R)
• M54: 14,226,907 km (0.044 R)
• M55: 14,371,718 km (0.112 R)
• M56: 14,468,508 km (0.116 R)
• M57: 14,589,981 km (0.1 R)
• M58: 14,809,142 km (0.105 R)
• M59: 14,956,047 km (0.033 R)
• M60: 15,177,153 km (0.074 R)
• M61: 15,275,738 km (0.074 R)
• M62: 15,722,287 km (0.047 R)
• M63: 15,922,001 km (0.1 R)
• M64: 16,349,551 km (0.066 R)
• M65: 16,780,692 km (0.107 R)

Planet 6 - Gas Giant

Semi-Major Axis: 3.36 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 309.1

Radius: 9.9

Gravity: 3.15 G

Time & Orbit

Eccentricity (e): 0.029

Orbit Range: 3.26 AU - 3.46 AU

Year: 4251 Days

Day: 11.4 Hours

Environment

Temp: -222 °C

Axial Tilt: 31.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (67)

Outer Limit: 27,610,007 km

• M1: 375,191 km (0.11 R)
• M2: 489,484 km (0.06 R)
• M3: 608,265 km (0.111 R)
• M4: 918,531 km (0.055 R)
• M5: 1,159,533 km (0.094 R)
• M6: 1,495,530 km (0.093 R)
• M7: 1,957,488 km (0.081 R)
• M8: 2,041,113 km (0.098 R)
• M9: 2,125,935 km (0.083 R)
• M10: 2,240,827 km (0.077 R)
• M11: 2,628,883 km (0.116 R)
• M12: 2,783,867 km (0.102 R)
• M13: 3,038,183 km (0.089 R)
• M14: 3,184,639 km (0.055 R)
• M15: 3,267,068 km (0.05 R)
• M16: 3,400,360 km (0.06 R)
• M17: 3,569,555 km (0.118 R)
• M18: 3,793,652 km (0.089 R)
• M19: 4,383,367 km (0.101 R)
• M20: 4,679,721 km (0.095 R)
• M21: 5,508,194 km (0.074 R)
• M22: 5,687,412 km (0.106 R)
• M23: 5,949,657 km (0.102 R)
• M24: 6,051,533 km (0.115 R)
• M25: 6,319,313 km (0.087 R)
• M26: 6,381,546 km (0.116 R)
• M27: 6,590,833 km (0.082 R)
• M28: 6,845,000 km (0.095 R)
• M29: 7,210,617 km (0.087 R)
• M30: 7,319,375 km (0.106 R)
• M31: 7,759,941 km (0.109 R)
• M32: 7,938,561 km (0.065 R)
• M33: 8,436,871 km (0.092 R)
• M34: 8,968,692 km (0.091 R)
• M35: 9,250,534 km (0.089 R)
• M36: 9,321,443 km (0.078 R)
• M37: 9,559,005 km (0.025 R)
• M38: 9,846,981 km (0.089 R)
• M39: 10,308,490 km (0.059 R)
• M40: 10,579,113 km (0.025 R)
• M41: 10,727,663 km (0.096 R)
• M42: 11,202,637 km (0.116 R)
• M43: 11,430,025 km (0.104 R)
• M44: 11,658,910 km (0.11 R)
• M45: 12,043,825 km (0.059 R)
• M46: 12,432,929 km (0.087 R)
• M47: 12,694,726 km (0.047 R)
• M48: 13,170,447 km (0.034 R)
• M49: 13,571,220 km (0.104 R)
• M50: 13,867,872 km (0.041 R)
• M51: 13,976,181 km (0.094 R)
• M52: 14,275,676 km (0.116 R)
• M53: 14,412,558 km (0.07 R)
• M54: 14,549,739 km (0.063 R)
• M55: 14,964,125 km (0.116 R)
• M56: 15,466,625 km (0.056 R)
• M57: 16,402,060 km (0.084 R)
• M58: 16,862,223 km (0.081 R)
• M59: 17,355,896 km (0.047 R)
• M60: 17,472,732 km (0.084 R)
• M61: 17,736,473 km (0.091 R)
• M62: 18,179,133 km (0.077 R)
• M63: 18,268,144 km (0.115 R)
• M64: 18,416,695 km (0.118 R)
• M65: 19,833,237 km (0.109 R)
• M66: 19,955,458 km (0.11 R)
• M67: 20,261,835 km (0.082 R)

Planet 7 - Gas Giant

Semi-Major Axis: 3.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 609

Radius: 9.8

Gravity: 6.34 G

Time & Orbit

Eccentricity (e): 0

Orbit Range: 3.56 AU - 3.56 AU

Year: 4636 Days

Day: 14.6 Hours

Environment

Temp: -214 °C

Axial Tilt: 33.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 27,610,007 km

• M1: 134,638 km (0.041 R)
• M2: 384,317 km (0.118 R)
• M3: 457,321 km (0.107 R)
• M4: 525,837 km (0.111 R)
• M5: 641,924 km (0.103 R)
• M6: 720,613 km (0.059 R)
• M7: 864,077 km (0.114 R)
• M8: 1,293,274 km (0.071 R)
• M9: 1,365,978 km (0.073 R)
• M10: 1,455,138 km (0.09 R)
• M11: 1,530,985 km (0.115 R)
• M12: 2,309,193 km (0.107 R)
• M13: 2,525,362 km (0.08 R)
• M14: 2,654,614 km (0.113 R)
• M15: 2,748,262 km (0.068 R)
• M16: 3,036,089 km (0.099 R)
• M17: 3,599,175 km (0.077 R)
• M18: 3,661,557 km (0.063 R)
• M19: 3,745,033 km (0.078 R)
• M20: 3,829,406 km (0.08 R)
• M21: 3,914,228 km (0.061 R)
• M22: 4,042,733 km (0.081 R)
• M23: 4,436,923 km (0.071 R)
• M24: 5,144,521 km (0.112 R)
• M25: 5,692,049 km (0.079 R)
• M26: 5,960,578 km (0.103 R)
• M27: 6,459,486 km (0.03 R)
• M28: 6,945,829 km (0.041 R)
• M29: 7,232,907 km (0.037 R)
• M30: 7,497,247 km (0.071 R)
• M31: 7,577,132 km (0.088 R)
• M32: 7,926,892 km (0.078 R)
• M33: 8,586,170 km (0.069 R)
• M34: 8,781,844 km (0.114 R)
• M35: 8,866,217 km (0.101 R)
• M36: 8,950,740 km (0.118 R)
• M37: 9,406,415 km (0.092 R)
• M38: 10,310,584 km (0.073 R)
• M39: 10,668,123 km (0.114 R)
• M40: 11,090,289 km (0.107 R)
• M41: 11,487,321 km (0.084 R)
• M42: 11,610,291 km (0.084 R)
• M43: 11,672,075 km (0.09 R)
• M44: 12,484,242 km (0.036 R)
• M45: 12,610,801 km (0.086 R)
• M46: 12,865,267 km (0.055 R)
• M47: 13,121,379 km (0.088 R)
• M48: 14,096,907 km (0.084 R)
• M49: 14,927,624 km (0.085 R)
• M50: 15,501,631 km (0.027 R)
• M51: 16,358,826 km (0.099 R)
• M52: 16,462,647 km (0.107 R)
• M53: 17,020,498 km (0.094 R)
• M54: 17,196,126 km (0.087 R)
• M55: 17,301,742 km (0.12 R)
• M56: 17,762,054 km (0.089 R)
• M57: 18,118,995 km (0.11 R)
• M58: 19,423,189 km (0.049 R)
• M59: 19,643,397 km (0.104 R)
• M60: 20,794,852 km (0.087 R)
• M61: 20,982,597 km (0.037 R)
• M62: 21,057,845 km (0.096 R)
• M63: 21,208,640 km (0.057 R)
• M64: 21,435,580 km (0.09 R)
• M65: 21,815,558 km (0.11 R)
• M66: 22,581,948 km (0.05 R)
• M67: 23,085,046 km (0.083 R)
• M68: 23,162,687 km (0.069 R)
• M69: 23,396,359 km (0.107 R)
• M70: 23,591,584 km (0.067 R)
• M71: 23,669,973 km (0.101 R)
• M72: 23,787,557 km (0.027 R)
• M73: 24,023,174 km (0.041 R)
• M74: 24,378,319 km (0.106 R)
• M75: 24,457,457 km (0.092 R)
• M76: 25,213,524 km (0.058 R)
• M77: 25,574,354 km (0.12 R)
• M78: 25,977,371 km (0.084 R)
• M79: 26,301,250 km (0.049 R)
• M80: 26,423,023 km (0.049 R)
• M81: 26,748,698 km (0.06 R)

Kuiper Belt

Range: 30 - 46 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 328 - 12,866 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit