🌌 Stone's Star System Generator

Planet 1 - Gas Giant

Semi-Major Axis: 0.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 799.7

Radius: 9.9

Gravity: 8.16 G

Time & Orbit

Eccentricity (e): 0.174

Orbit Range: 0.52 AU - 0.74 AU

Year: 339 Days

Day: 12.7 Hours

Environment

Temp: -149 °C

Axial Tilt: 38.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (47)

Outer Limit: 56,012,557 km

• M1: 125,513 km (0.096 R)
• M2: 198,965 km (0.082 R)
• M3: 321,935 km (0.089 R)
• M4: 387,907 km (0.103 R)
• M5: 478,863 km (0.11 R)
• M6: 540,796 km (0.114 R)
• M7: 606,021 km (0.104 R)
• M8: 757,115 km (0.092 R)
• M9: 984,653 km (0.12 R)
• M10: 1,115,701 km (0.11 R)
• M11: 1,188,106 km (0.116 R)
• M12: 1,347,428 km (0.07 R)
• M13: 1,454,390 km (0.104 R)
• M14: 1,529,040 km (0.11 R)
• M15: 1,610,122 km (0.087 R)
• M16: 1,682,378 km (0.111 R)
• M17: 1,830,031 km (0.101 R)
• M18: 1,987,707 km (0.112 R)
• M19: 2,054,278 km (0.116 R)
• M20: 2,172,759 km (0.082 R)
• M21: 2,351,679 km (0.082 R)
• M22: 2,463,877 km (0.054 R)
• M23: 2,632,474 km (0.116 R)
• M24: 2,718,193 km (0.109 R)
• M25: 2,786,260 km (0.091 R)
• M26: 2,892,624 km (0.109 R)
• M27: 2,968,471 km (0.096 R)
• M28: 3,038,632 km (0.069 R)
• M29: 3,109,392 km (0.034 R)
• M30: 3,364,606 km (0.043 R)
• M31: 3,478,001 km (0.093 R)
• M32: 3,552,052 km (0.065 R)
• M33: 3,633,433 km (0.078 R)
• M34: 3,708,681 km (0.118 R)
• M35: 3,784,377 km (0.072 R)
• M36: 3,923,503 km (0.109 R)
• M37: 4,099,580 km (0.075 R)
• M38: 4,235,265 km (0.056 R)
• M39: 4,350,755 km (0.106 R)
• M40: 4,430,640 km (0.086 R)
• M41: 4,496,463 km (0.029 R)
• M42: 4,636,487 km (0.065 R)
• M43: 4,718,167 km (0.061 R)
• M44: 4,815,406 km (0.062 R)
• M45: 4,920,872 km (0.101 R)
• M46: 5,019,457 km (0.092 R)
• M47: 5,257,318 km (0.084 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.11 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 497

Radius: 8.4

Gravity: 7.04 G

Time & Orbit

Eccentricity (e): 0.214

Orbit Range: 0.87 AU - 1.35 AU

Year: 793 Days

Day: 11.8 Hours

Environment

Temp: -178 °C

Axial Tilt: 8.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (61)

Outer Limit: 56,012,557 km

• M1: 105,167 km (0.076 R)
• M2: 172,038 km (0.114 R)
• M3: 265,686 km (0.077 R)
• M4: 360,082 km (0.071 R)
• M5: 442,959 km (0.071 R)
• M6: 511,176 km (0.068 R)
• M7: 611,406 km (0.109 R)
• M8: 669,151 km (0.086 R)
• M9: 749,186 km (0.032 R)
• M10: 936,333 km (0.076 R)
• M11: 992,731 km (0.119 R)
• M12: 1,260,811 km (0.07 R)
• M13: 1,518,269 km (0.11 R)
• M14: 1,598,752 km (0.075 R)
• M15: 1,687,614 km (0.102 R)
• M16: 1,757,177 km (0.081 R)
• M17: 1,827,637 km (0.105 R)
• M18: 1,891,964 km (0.05 R)
• M19: 1,957,039 km (0.065 R)
• M20: 2,023,012 km (0.072 R)
• M21: 2,119,503 km (0.101 R)
• M22: 2,293,934 km (0.079 R)
• M23: 2,441,736 km (0.111 R)
• M24: 2,496,938 km (0.068 R)
• M25: 2,568,595 km (0.061 R)
• M26: 2,763,073 km (0.035 R)
• M27: 2,837,273 km (0.108 R)
• M28: 2,979,242 km (0.07 R)
• M29: 3,046,860 km (0.102 R)
• M30: 3,115,076 km (0.088 R)
• M31: 3,192,269 km (0.097 R)
• M32: 3,279,036 km (0.041 R)
• M33: 3,561,626 km (0.064 R)
• M34: 3,615,481 km (0.109 R)
• M35: 3,981,697 km (0.081 R)
• M36: 4,037,647 km (0.082 R)
• M37: 4,103,170 km (0.095 R)
• M38: 4,169,293 km (0.085 R)
• M39: 4,417,476 km (0.06 R)
• M40: 4,494,818 km (0.074 R)
• M41: 4,553,161 km (0.049 R)
• M42: 4,641,124 km (0.071 R)
• M43: 4,729,686 km (0.104 R)
• M44: 4,818,697 km (0.103 R)
• M45: 4,878,536 km (0.117 R)
• M46: 4,998,663 km (0.117 R)
• M47: 5,079,297 km (0.09 R)
• M48: 5,160,379 km (0.098 R)
• M49: 5,272,727 km (0.088 R)
• M50: 5,645,674 km (0.081 R)
• M51: 5,719,276 km (0.105 R)
• M52: 5,771,935 km (0.099 R)
• M53: 5,867,228 km (0.116 R)
• M54: 6,373,468 km (0.074 R)
• M55: 6,826,600 km (0.097 R)
• M56: 7,119,363 km (0.107 R)
• M57: 7,187,430 km (0.101 R)
• M58: 7,381,757 km (0.076 R)
• M59: 7,462,241 km (0.051 R)
• M60: 7,670,481 km (0.051 R)
• M61: 7,728,824 km (0.069 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.32 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 860.1

Radius: 8.2

Gravity: 12.79 G

Time & Orbit

Eccentricity (e): 0.078

Orbit Range: 2.14 AU - 2.5 AU

Year: 2397 Days

Day: 12 Hours

Environment

Temp: -208 °C

Axial Tilt: 27.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 56,012,557 km

• M1: 106,962 km (0.097 R)
• M2: 185,202 km (0.073 R)
• M3: 237,561 km (0.057 R)
• M4: 379,231 km (0.114 R)
• M5: 526,136 km (0.102 R)
• M6: 629,059 km (0.114 R)
• M7: 1,152,951 km (0.092 R)
• M8: 1,481,169 km (0.038 R)
• M9: 1,592,769 km (0.059 R)
• M10: 1,720,076 km (0.117 R)
• M11: 1,785,151 km (0.093 R)
• M12: 1,864,139 km (0.077 R)
• M13: 2,039,617 km (0.035 R)
• M14: 2,435,902 km (0.105 R)
• M15: 2,748,861 km (0.107 R)
• M16: 3,011,704 km (0.081 R)
• M17: 3,363,858 km (0.109 R)
• M18: 3,445,688 km (0.077 R)
• M19: 3,695,367 km (0.037 R)
• M20: 3,950,880 km (0.106 R)
• M21: 4,107,060 km (0.117 R)
• M22: 4,407,602 km (0.112 R)
• M23: 4,551,515 km (0.119 R)
• M24: 5,123,877 km (0.078 R)
• M25: 5,275,270 km (0.095 R)
• M26: 5,505,202 km (0.115 R)
• M27: 6,114,215 km (0.068 R)
• M28: 6,214,595 km (0.056 R)
• M29: 6,275,032 km (0.05 R)
• M30: 6,518,578 km (0.079 R)
• M31: 6,827,647 km (0.088 R)
• M32: 7,183,540 km (0.076 R)
• M33: 7,353,184 km (0.089 R)
• M34: 7,566,959 km (0.063 R)
• M35: 8,154,730 km (0.06 R)
• M36: 8,309,563 km (0.076 R)
• M37: 8,554,754 km (0.05 R)
• M38: 8,644,513 km (0.091 R)
• M39: 8,779,749 km (0.108 R)
• M40: 9,281,650 km (0.072 R)
• M41: 9,350,765 km (0.097 R)
• M42: 9,512,929 km (0.031 R)
• M43: 9,886,774 km (0.062 R)
• M44: 9,957,384 km (0.069 R)
• M45: 10,265,555 km (0.093 R)
• M46: 10,624,890 km (0.119 R)
• M47: 10,697,295 km (0.081 R)
• M48: 10,964,178 km (0.091 R)
• M49: 11,135,018 km (0.091 R)
• M50: 11,380,808 km (0.109 R)
• M51: 11,628,242 km (0.115 R)
• M52: 11,777,691 km (0.11 R)
• M53: 11,927,588 km (0.047 R)
• M54: 12,078,233 km (0.069 R)
• M55: 13,776,618 km (0.038 R)
• M56: 14,040,508 km (0.089 R)
• M57: 14,359,301 km (0.093 R)
• M58: 14,519,521 km (0.026 R)
• M59: 14,734,193 km (0.11 R)
• M60: 14,976,991 km (0.117 R)
• M61: 15,193,908 km (0.108 R)
• M62: 15,248,212 km (0.117 R)
• M63: 15,302,665 km (0.118 R)
• M64: 15,439,099 km (0.12 R)
• M65: 15,603,357 km (0.086 R)
• M66: 15,740,688 km (0.07 R)
• M67: 15,905,994 km (0.113 R)
• M68: 16,044,072 km (0.074 R)
• M69: 16,099,573 km (0.101 R)
• M70: 16,461,151 km (0.085 R)
• M71: 16,937,920 km (0.066 R)
• M72: 17,305,631 km (0.091 R)
• M73: 17,362,478 km (0.073 R)
• M74: 17,761,905 km (0.031 R)
• M75: 18,020,260 km (0.028 R)
• M76: 18,366,729 km (0.115 R)
• M77: 18,540,711 km (0.115 R)
• M78: 18,686,120 km (0.11 R)
• M79: 18,890,471 km (0.086 R)
• M80: 19,833,686 km (0.065 R)

Asteroid Belt

Center: 2.92 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 4 - Gas Giant

Semi-Major Axis: 3.51 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 518.4

Radius: 10

Gravity: 5.18 G

Time & Orbit

Eccentricity (e): 0.154

Orbit Range: 2.97 AU - 4.05 AU

Year: 4460 Days

Day: 5.3 Hours

Environment

Temp: -215 °C

Axial Tilt: 6.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (78)

Outer Limit: 56,012,557 km

• M1: 170,990 km (0.076 R)
• M2: 319,840 km (0.118 R)
• M3: 442,810 km (0.063 R)
• M4: 564,433 km (0.104 R)
• M5: 666,608 km (0.111 R)
• M6: 775,515 km (0.055 R)
• M7: 1,012,478 km (0.056 R)
• M8: 1,126,921 km (0.115 R)
• M9: 1,341,295 km (0.095 R)
• M10: 1,687,763 km (0.094 R)
• M11: 2,078,363 km (0.103 R)
• M12: 2,326,247 km (0.077 R)
• M13: 2,496,788 km (0.084 R)
• M14: 2,601,208 km (0.103 R)
• M15: 2,959,943 km (0.03 R)
• M16: 3,052,096 km (0.088 R)
• M17: 3,507,771 km (0.075 R)
• M18: 4,046,174 km (0.108 R)
• M19: 4,231,525 km (0.075 R)
• M20: 4,504,093 km (0.068 R)
• M21: 4,589,064 km (0.086 R)
• M22: 4,653,242 km (0.072 R)
• M23: 4,804,036 km (0.114 R)
• M24: 5,000,458 km (0.066 R)
• M25: 5,066,431 km (0.063 R)
• M26: 5,244,004 km (0.099 R)
• M27: 5,311,173 km (0.094 R)
• M28: 5,651,060 km (0.089 R)
• M29: 5,742,913 km (0.113 R)
• M30: 5,881,590 km (0.058 R)
• M31: 6,209,658 km (0.107 R)
• M32: 6,688,670 km (0.11 R)
• M33: 7,279,283 km (0.1 R)
• M34: 7,580,872 km (0.067 R)
• M35: 8,144,407 km (0.111 R)
• M36: 8,510,174 km (0.03 R)
• M37: 8,907,955 km (0.087 R)
• M38: 9,015,067 km (0.055 R)
• M39: 9,611,962 km (0.093 R)
• M40: 10,026,199 km (0.105 R)
• M41: 10,221,574 km (0.098 R)
• M42: 10,843,602 km (0.086 R)
• M43: 11,216,998 km (0.037 R)
• M44: 11,303,765 km (0.114 R)
• M45: 11,419,853 km (0.062 R)
• M46: 12,541,986 km (0.073 R)
• M47: 13,268,882 km (0.114 R)
• M48: 14,009,242 km (0.113 R)
• M49: 14,134,007 km (0.064 R)
• M50: 14,636,506 km (0.087 R)
• M51: 15,626,844 km (0.087 R)
• M52: 15,723,783 km (0.096 R)
• M53: 16,113,785 km (0.116 R)
• M54: 16,539,840 km (0.111 R)
• M55: 16,969,634 km (0.115 R)
• M56: 17,036,206 km (0.106 R)
• M57: 17,874,103 km (0.106 R)
• M58: 18,213,092 km (0.111 R)
• M59: 18,485,809 km (0.037 R)
• M60: 18,966,168 km (0.116 R)
• M61: 19,173,361 km (0.077 R)
• M62: 20,220,546 km (0.03 R)
• M63: 20,502,987 km (0.04 R)
• M64: 20,928,892 km (0.1 R)
• M65: 21,143,116 km (0.103 R)
• M66: 21,681,519 km (0.06 R)
• M67: 21,789,827 km (0.114 R)
• M68: 22,006,744 km (0.091 R)
• M69: 22,079,299 km (0.091 R)
• M70: 22,151,854 km (0.105 R)
• M71: 22,845,240 km (0.036 R)
• M72: 23,323,954 km (0.118 R)
• M73: 23,731,458 km (0.084 R)
• M74: 24,290,954 km (0.051 R)
• M75: 24,930,336 km (0.065 R)
• M76: 25,043,880 km (0.052 R)
• M77: 25,195,273 km (0.071 R)
• M78: 25,347,115 km (0.096 R)

Planet 5 - Gas Giant

Semi-Major Axis: 4.75 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 375

Radius: 13.4

Gravity: 2.09 G

Time & Orbit

Eccentricity (e): 0.167

Orbit Range: 3.96 AU - 5.54 AU

Year: 7022 Days

Day: 5.7 Hours

Environment

Temp: -226 °C

Axial Tilt: 31.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 56,012,557 km

• M1: 192,981 km (0.082 R)
• M2: 441,314 km (0.112 R)
• M3: 630,854 km (0.099 R)
• M4: 837,748 km (0.114 R)
• M5: 943,663 km (0.101 R)
• M6: 1,126,322 km (0.103 R)
• M7: 1,336,956 km (0.11 R)
• M8: 2,539,125 km (0.079 R)
• M9: 2,658,055 km (0.106 R)
• M10: 2,819,621 km (0.112 R)
• M11: 2,943,039 km (0.116 R)
• M12: 3,152,775 km (0.049 R)
• M13: 3,389,289 km (0.031 R)
• M14: 3,631,788 km (0.038 R)
• M15: 4,441,262 km (0.084 R)
• M16: 4,682,713 km (0.119 R)
• M17: 4,878,985 km (0.1 R)
• M18: 5,003,151 km (0.03 R)
• M19: 5,178,779 km (0.12 R)
• M20: 5,875,008 km (0.116 R)
• M21: 6,007,252 km (0.105 R)
• M22: 6,274,733 km (0.065 R)
• M23: 6,546,253 km (0.114 R)
• M24: 6,904,989 km (0.072 R)
• M25: 7,213,609 km (0.116 R)
• M26: 7,383,852 km (0.086 R)
• M27: 7,555,440 km (0.115 R)
• M28: 7,786,270 km (0.086 R)
• M29: 8,225,639 km (0.083 R)
• M30: 8,344,120 km (0.066 R)
• M31: 8,582,879 km (0.062 R)
• M32: 8,703,006 km (0.109 R)
• M33: 8,793,662 km (0.101 R)
• M34: 9,436,185 km (0.064 R)
• M35: 9,529,384 km (0.077 R)
• M36: 9,716,382 km (0.069 R)
• M37: 9,841,745 km (0.107 R)
• M38: 10,030,836 km (0.096 R)
• M39: 10,508,802 km (0.112 R)
• M40: 10,961,784 km (0.092 R)
• M41: 11,059,621 km (0.108 R)
• M42: 11,157,757 km (0.09 R)
• M43: 11,387,988 km (0.102 R)
• M44: 11,719,647 km (0.116 R)
• M45: 11,886,748 km (0.072 R)
• M46: 13,881,635 km (0.098 R)
• M47: 14,164,824 km (0.079 R)
• M48: 15,244,173 km (0.092 R)
• M49: 15,756,845 km (0.077 R)
• M50: 15,904,348 km (0.114 R)
• M51: 16,536,549 km (0.086 R)
• M52: 16,686,595 km (0.067 R)
• M53: 17,979,420 km (0.037 R)
• M54: 18,989,804 km (0.119 R)
• M55: 19,660,302 km (0.119 R)
• M56: 20,781,687 km (0.116 R)
• M57: 21,268,628 km (0.111 R)
• M58: 21,841,588 km (0.081 R)
• M59: 22,047,435 km (0.101 R)
• M60: 23,548,350 km (0.114 R)
• M61: 24,056,086 km (0.114 R)
• M62: 25,644,067 km (0.119 R)
• M63: 25,861,283 km (0.032 R)
• M64: 26,385,025 km (0.12 R)
• M65: 26,692,299 km (0.078 R)
• M66: 27,620,853 km (0.074 R)
• M67: 27,754,295 km (0.115 R)
• M68: 28,111,534 km (0.096 R)
• M69: 29,101,423 km (0.052 R)
• M70: 29,373,392 km (0.113 R)
• M71: 29,509,676 km (0.082 R)
• M72: 30,102,832 km (0.119 R)

Planet 6 - Ice Giant

Semi-Major Axis: 8.24 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 424.7

Radius: 7.1

Gravity: 8.42 G

Time & Orbit

Eccentricity (e): 0.037

Orbit Range: 7.94 AU - 8.54 AU

Year: 16043 Days

Day: 24.5 Hours

Environment

Temp: -240 °C

Axial Tilt: 14.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 56,012,557 km

• M1: 108,010 km (0.092 R)
• M2: 713,582 km (0.051 R)
• M3: 889,808 km (0.114 R)
• M4: 1,015,022 km (0.065 R)
• M5: 1,330,075 km (0.067 R)
• M6: 1,623,436 km (0.097 R)
• M7: 3,304,767 km (0.104 R)
• M8: 3,802,479 km (0.103 R)
• M9: 3,939,211 km (0.073 R)
• M10: 4,112,445 km (0.083 R)
• M11: 5,279,010 km (0.073 R)
• M12: 5,819,806 km (0.106 R)
• M13: 6,256,931 km (0.119 R)
• M14: 6,704,827 km (0.051 R)
• M15: 6,787,255 km (0.04 R)
• M16: 6,995,047 km (0.066 R)
• M17: 7,205,082 km (0.033 R)
• M18: 7,760,539 km (0.079 R)
• M19: 9,094,354 km (0.065 R)
• M20: 9,231,685 km (0.079 R)
• M21: 9,277,611 km (0.119 R)
• M22: 9,323,538 km (0.105 R)
• M23: 10,259,123 km (0.077 R)
• M24: 10,883,245 km (0.079 R)
• M25: 10,931,715 km (0.115 R)
• M26: 10,980,334 km (0.094 R)
• M27: 12,167,992 km (0.103 R)
• M28: 13,552,071 km (0.056 R)
• M29: 13,813,867 km (0.081 R)
• M30: 14,236,182 km (0.111 R)
• M31: 15,473,805 km (0.043 R)
• M32: 15,912,277 km (0.088 R)
• M33: 17,082,730 km (0.105 R)
• M34: 17,139,278 km (0.107 R)
• M35: 17,195,677 km (0.054 R)
• M36: 17,536,012 km (0.032 R)
• M37: 18,686,120 km (0.077 R)
• M38: 19,035,880 km (0.09 R)
• M39: 19,153,015 km (0.094 R)
• M40: 19,505,618 km (0.094 R)
• M41: 19,682,891 km (0.07 R)
• M42: 20,756,854 km (0.1 R)
• M43: 21,727,595 km (0.104 R)
• M44: 21,788,631 km (0.117 R)
• M45: 22,527,046 km (0.095 R)
• M46: 22,774,929 km (0.105 R)
• M47: 22,837,162 km (0.113 R)
• M48: 24,408,538 km (0.105 R)
• M49: 24,918,817 km (0.12 R)
• M50: 24,982,844 km (0.061 R)
• M51: 25,111,050 km (0.098 R)
• M52: 26,274,772 km (0.088 R)
• M53: 26,601,045 km (0.099 R)
• M54: 27,588,241 km (0.045 R)
• M55: 27,654,513 km (0.118 R)
• M56: 28,319,775 km (0.111 R)
• M57: 28,386,645 km (0.114 R)
• M58: 28,654,425 km (0.084 R)
• M59: 28,990,422 km (0.107 R)
• M60: 29,395,234 km (0.08 R)
• M61: 29,937,975 km (0.104 R)
• M62: 30,621,039 km (0.073 R)
• M63: 31,378,303 km (0.098 R)
• M64: 32,071,988 km (0.096 R)
• M65: 32,350,988 km (0.069 R)
• M66: 32,490,713 km (0.082 R)
• M67: 33,899,326 km (0.114 R)
• M68: 35,112,415 km (0.093 R)
• M69: 36,267,012 km (0.114 R)
• M70: 36,412,122 km (0.081 R)
• M71: 36,921,951 km (0.05 R)
• M72: 37,727,685 km (0.114 R)
• M73: 37,801,138 km (0.049 R)
• M74: 38,539,254 km (0.096 R)
• M75: 39,207,508 km (0.089 R)
• M76: 39,655,104 km (0.05 R)
• M77: 42,529,328 km (0.103 R)
• M78: 42,682,367 km (0.094 R)
• M79: 42,989,192 km (0.082 R)
• M80: 43,065,936 km (0.1 R)
• M81: 43,527,894 km (0.074 R)
• M82: 43,759,322 km (0.102 R)
• M83: 43,914,006 km (0.096 R)
• M84: 45,783,232 km (0.096 R)
• M85: 45,940,160 km (0.089 R)
• M86: 46,018,699 km (0.111 R)
• M87: 48,795,385 km (0.108 R)
• M88: 49,035,938 km (0.103 R)
• M89: 50,082,824 km (0.043 R)
• M90: 51,952,947 km (0.094 R)
• M91: 52,198,437 km (0.04 R)
• M92: 52,444,526 km (0.1 R)
• M93: 52,526,655 km (0.093 R)
• M94: 53,267,314 km (0.086 R)
• M95: 53,680,204 km (0.052 R)
• M96: 55,761,110 km (0.112 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: 230 - 18,237 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit