🌌 Stone's Star System Generator

Asteroid Belt

Center: 0.41 AU

Composition

Type: Inner (Rocky/Metallic)

A dense region of planetesimals and debris.

Boundary

Planet 1 - Gas Giant

Semi-Major Axis: 0.81 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 419.6

Radius: 13.2

Gravity: 2.41 G

Time & Orbit

Eccentricity (e): 0.002

Orbit Range: 0.81 AU - 0.81 AU

Year: 478 Days

Day: 6.6 Hours

Environment

Temp: -143 °C

Axial Tilt: 6.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (37)

Outer Limit: 29,491,710 km

• M1: 165,455 km (0.093 R)
• M2: 252,372 km (0.052 R)
• M3: 374,892 km (0.077 R)
• M4: 460,163 km (0.086 R)
• M5: 577,897 km (0.101 R)
• M6: 671,694 km (0.119 R)
• M7: 756,516 km (0.102 R)
• M8: 857,495 km (0.113 R)
• M9: 988,692 km (0.056 R)
• M10: 1,074,562 km (0.095 R)
• M11: 1,190,350 km (0.073 R)
• M12: 1,415,944 km (0.083 R)
• M13: 1,609,823 km (0.114 R)
• M14: 1,728,454 km (0.119 R)
• M15: 1,812,827 km (0.062 R)
• M16: 1,920,238 km (0.093 R)
• M17: 2,030,043 km (0.106 R)
• M18: 2,153,312 km (0.098 R)
• M19: 2,389,826 km (0.111 R)
• M20: 2,502,473 km (0.116 R)
• M21: 2,659,551 km (0.105 R)
• M22: 2,801,220 km (0.117 R)
• M23: 2,932,866 km (0.094 R)
• M24: 3,034,742 km (0.097 R)
• M25: 3,124,651 km (0.108 R)
• M26: 3,333,938 km (0.101 R)
• M27: 3,534,399 km (0.09 R)
• M28: 3,656,621 km (0.102 R)
• M29: 3,828,808 km (0.093 R)
• M30: 3,926,346 km (0.057 R)
• M31: 4,046,024 km (0.057 R)
• M32: 4,419,719 km (0.094 R)
• M33: 4,522,194 km (0.097 R)
• M34: 4,744,646 km (0.1 R)
• M35: 4,842,184 km (0.102 R)
• M36: 5,039,354 km (0.038 R)
• M37: 5,270,034 km (0.046 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.4 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 210

Radius: 10.1

Gravity: 2.06 G

Time & Orbit

Eccentricity (e): 0.178

Orbit Range: 1.15 AU - 1.65 AU

Year: 1087 Days

Day: 10.9 Hours

Environment

Temp: -170 °C

Axial Tilt: 42.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (55)

Outer Limit: 29,491,710 km

• M1: 146,008 km (0.097 R)
• M2: 208,988 km (0.094 R)
• M3: 314,455 km (0.072 R)
• M4: 407,804 km (0.068 R)
• M5: 472,580 km (0.082 R)
• M6: 550,071 km (0.098 R)
• M7: 673,490 km (0.112 R)
• M8: 772,673 km (0.073 R)
• M9: 892,501 km (0.107 R)
• M10: 976,126 km (0.115 R)
• M11: 1,040,752 km (0.118 R)
• M12: 1,243,757 km (0.109 R)
• M13: 1,308,383 km (0.091 R)
• M14: 1,374,206 km (0.113 R)
• M15: 1,497,026 km (0.113 R)
• M16: 1,610,720 km (0.04 R)
• M17: 1,701,227 km (0.11 R)
• M18: 1,780,215 km (0.109 R)
• M19: 1,901,090 km (0.079 R)
• M20: 2,108,881 km (0.103 R)
• M21: 2,237,087 km (0.095 R)
• M22: 2,302,162 km (0.1 R)
• M23: 2,367,985 km (0.099 R)
• M24: 2,478,986 km (0.07 R)
• M25: 2,584,303 km (0.092 R)
• M26: 2,683,337 km (0.069 R)
• M27: 2,877,515 km (0.109 R)
• M28: 2,948,574 km (0.038 R)
• M29: 3,124,800 km (0.094 R)
• M30: 3,197,954 km (0.067 R)
• M31: 3,304,617 km (0.106 R)
• M32: 3,546,816 km (0.051 R)
• M33: 3,743,088 km (0.039 R)
• M34: 3,986,933 km (0.107 R)
• M35: 4,075,345 km (0.117 R)
• M36: 4,146,554 km (0.118 R)
• M37: 4,218,062 km (0.105 R)
• M38: 4,517,856 km (0.06 R)
• M39: 4,824,531 km (0.084 R)
• M40: 5,013,623 km (0.08 R)
• M41: 5,137,939 km (0.071 R)
• M42: 5,282,750 km (0.084 R)
• M43: 5,370,264 km (0.113 R)
• M44: 5,477,825 km (0.074 R)
• M45: 5,586,134 km (0.058 R)
• M46: 5,764,904 km (0.107 R)
• M47: 5,875,157 km (0.079 R)
• M48: 6,312,731 km (0.119 R)
• M49: 6,478,336 km (0.057 R)
• M50: 6,634,815 km (0.114 R)
• M51: 6,729,361 km (0.107 R)
• M52: 6,866,542 km (0.083 R)
• M53: 7,154,817 km (0.078 R)
• M54: 7,219,444 km (0.112 R)
• M55: 7,338,374 km (0.079 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.99 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 207.1

Radius: 11.8

Gravity: 1.49 G

Time & Orbit

Eccentricity (e): 0.101

Orbit Range: 1.79 AU - 2.19 AU

Year: 1842 Days

Day: 12.1 Hours

Environment

Temp: -197 °C

Axial Tilt: 38.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (56)

Outer Limit: 29,491,710 km

• M1: 147,653 km (0.082 R)
• M2: 232,026 km (0.091 R)
• M3: 328,816 km (0.111 R)
• M4: 531,521 km (0.09 R)
• M5: 673,041 km (0.113 R)
• M6: 779,255 km (0.107 R)
• M7: 997,070 km (0.113 R)
• M8: 1,071,869 km (0.077 R)
• M9: 1,206,208 km (0.114 R)
• M10: 1,338,751 km (0.074 R)
• M11: 1,460,973 km (0.097 R)
• M12: 1,808,489 km (0.083 R)
• M13: 1,961,826 km (0.115 R)
• M14: 2,137,454 km (0.111 R)
• M15: 2,218,088 km (0.07 R)
• M16: 2,457,295 km (0.085 R)
• M17: 2,561,116 km (0.09 R)
• M18: 2,851,934 km (0.059 R)
• M19: 2,931,221 km (0.109 R)
• M20: 3,082,165 km (0.101 R)
• M21: 3,391,683 km (0.113 R)
• M22: 3,486,528 km (0.102 R)
• M23: 3,678,911 km (0.117 R)
• M24: 3,776,598 km (0.111 R)
• M25: 4,063,228 km (0.109 R)
• M26: 4,186,796 km (0.099 R)
• M27: 4,277,452 km (0.103 R)
• M28: 4,357,188 km (0.092 R)
• M29: 4,437,671 km (0.077 R)
• M30: 4,634,841 km (0.074 R)
• M31: 4,799,399 km (0.091 R)
• M32: 5,062,093 km (0.087 R)
• M33: 5,219,470 km (0.049 R)
• M34: 5,464,960 km (0.105 R)
• M35: 5,777,171 km (0.052 R)
• M36: 5,992,741 km (0.057 R)
• M37: 6,108,081 km (0.053 R)
• M38: 6,249,900 km (0.081 R)
• M39: 6,366,885 km (0.104 R)
• M40: 6,458,290 km (0.112 R)
• M41: 6,589,637 km (0.067 R)
• M42: 6,828,395 km (0.12 R)
• M43: 7,002,676 km (0.027 R)
• M44: 7,369,341 km (0.108 R)
• M45: 7,534,198 km (0.099 R)
• M46: 8,036,547 km (0.097 R)
• M47: 8,220,702 km (0.102 R)
• M48: 8,306,123 km (0.066 R)
• M49: 8,434,777 km (0.069 R)
• M50: 8,665,307 km (0.117 R)
• M51: 8,795,906 km (0.1 R)
• M52: 9,000,257 km (0.035 R)
• M53: 9,191,592 km (0.116 R)
• M54: 9,413,895 km (0.106 R)
• M55: 10,076,464 km (0.034 R)
• M56: 10,305,648 km (0.085 R)

Planet 4 - Gas Giant

Semi-Major Axis: 3.55 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 101.2

Radius: 12.5

Gravity: 0.65 G

Time & Orbit

Eccentricity (e): 0.007

Orbit Range: 3.53 AU - 3.57 AU

Year: 4388 Days

Day: 7.8 Hours

Environment

Temp: -204 °C

Axial Tilt: 45.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (52)

Outer Limit: 29,491,710 km

• M1: 155,881 km (0.085 R)
• M2: 280,047 km (0.033 R)
• M3: 384,317 km (0.096 R)
• M4: 507,885 km (0.106 R)
• M5: 585,975 km (0.115 R)
• M6: 690,843 km (0.107 R)
• M7: 865,573 km (0.07 R)
• M8: 1,215,184 km (0.047 R)
• M9: 1,392,457 km (0.05 R)
• M10: 1,588,580 km (0.093 R)
• M11: 1,679,984 km (0.09 R)
• M12: 1,954,197 km (0.109 R)
• M13: 2,107,984 km (0.072 R)
• M14: 2,231,701 km (0.11 R)
• M15: 2,357,962 km (0.084 R)
• M16: 2,439,642 km (0.099 R)
• M17: 2,593,877 km (0.074 R)
• M18: 2,924,788 km (0.108 R)
• M19: 3,256,297 km (0.09 R)
• M20: 3,347,701 km (0.101 R)
• M21: 3,493,110 km (0.062 R)
• M22: 3,708,382 km (0.114 R)
• M23: 4,025,679 km (0.086 R)
• M24: 4,123,965 km (0.114 R)
• M25: 4,686,602 km (0.102 R)
• M26: 4,924,612 km (0.041 R)
• M27: 5,273,624 km (0.041 R)
• M28: 5,474,534 km (0.101 R)
• M29: 5,804,397 km (0.118 R)
• M30: 6,189,462 km (0.027 R)
• M31: 6,287,150 km (0.091 R)
• M32: 6,649,326 km (0.095 R)
• M33: 6,799,522 km (0.095 R)
• M34: 7,086,302 km (0.068 R)
• M35: 7,567,408 km (0.092 R)
• M36: 7,706,684 km (0.055 R)
• M37: 8,005,880 km (0.118 R)
• M38: 8,633,742 km (0.034 R)
• M39: 9,184,561 km (0.081 R)
• M40: 9,917,740 km (0.108 R)
• M41: 10,262,414 km (0.037 R)
• M42: 10,397,650 km (0.099 R)
• M43: 10,747,859 km (0.062 R)
• M44: 11,003,223 km (0.116 R)
• M45: 11,141,601 km (0.061 R)
• M46: 11,300,474 km (0.081 R)
• M47: 11,459,945 km (0.046 R)
• M48: 12,167,094 km (0.07 R)
• M49: 13,327,674 km (0.083 R)
• M50: 13,750,737 km (0.068 R)
• M51: 13,878,494 km (0.1 R)
• M52: 14,264,307 km (0.109 R)

Planet 5 - Gas Giant

Semi-Major Axis: 4.04 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 281.2

Radius: 9.7

Gravity: 2.99 G

Time & Orbit

Eccentricity (e): 0.054

Orbit Range: 3.82 AU - 4.26 AU

Year: 5327 Days

Day: 14.7 Hours

Environment

Temp: -209 °C

Axial Tilt: 5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 29,491,710 km

• M1: 155,133 km (0.063 R)
• M2: 357,988 km (0.105 R)
• M3: 749,485 km (0.099 R)
• M4: 835,055 km (0.09 R)
• M5: 1,040,752 km (0.095 R)
• M6: 1,393,205 km (0.062 R)
• M7: 1,611,169 km (0.096 R)
• M8: 1,811,032 km (0.075 R)
• M9: 2,049,341 km (0.047 R)
• M10: 2,188,018 km (0.059 R)
• M11: 2,773,694 km (0.086 R)
• M12: 3,172,672 km (0.116 R)
• M13: 3,645,401 km (0.113 R)
• M14: 4,257,555 km (0.036 R)
• M15: 4,656,533 km (0.114 R)
• M16: 4,758,110 km (0.071 R)
• M17: 4,881,079 km (0.038 R)
• M18: 4,963,657 km (0.071 R)
• M19: 5,151,103 km (0.057 R)
• M20: 5,340,943 km (0.043 R)
• M21: 5,705,812 km (0.028 R)
• M22: 5,858,402 km (0.105 R)
• M23: 5,924,225 km (0.071 R)
• M24: 6,301,960 km (0.113 R)
• M25: 6,391,868 km (0.081 R)
• M26: 6,459,636 km (0.078 R)
• M27: 6,527,703 km (0.12 R)
• M28: 6,894,667 km (0.104 R)
• M29: 6,964,230 km (0.099 R)
• M30: 7,127,441 km (0.053 R)
• M31: 7,362,908 km (0.072 R)
• M32: 7,672,725 km (0.1 R)
• M33: 7,841,322 km (0.097 R)
• M34: 8,354,592 km (0.113 R)
• M35: 8,503,293 km (0.109 R)
• M36: 8,602,775 km (0.103 R)
• M37: 9,106,621 km (0.051 R)
• M38: 9,183,065 km (0.082 R)
• M39: 9,336,553 km (0.066 R)
• M40: 9,645,921 km (0.046 R)
• M41: 10,116,556 km (0.067 R)
• M42: 10,195,693 km (0.086 R)
• M43: 10,381,195 km (0.087 R)
• M44: 11,216,100 km (0.108 R)
• M45: 11,683,145 km (0.112 R)
• M46: 11,793,997 km (0.115 R)
• M47: 11,905,148 km (0.086 R)
• M48: 12,721,653 km (0.117 R)
• M49: 13,439,873 km (0.06 R)
• M50: 13,556,110 km (0.067 R)
• M51: 14,467,610 km (0.117 R)
• M52: 14,556,920 km (0.064 R)
• M53: 14,706,069 km (0.116 R)
• M54: 15,368,488 km (0.052 R)
• M55: 16,040,632 km (0.097 R)
• M56: 16,256,651 km (0.042 R)
• M57: 16,318,435 km (0.102 R)
• M58: 16,691,233 km (0.09 R)
• M59: 16,941,360 km (0.116 R)
• M60: 17,603,929 km (0.04 R)
• M61: 18,114,357 km (0.072 R)
• M62: 18,242,712 km (0.102 R)
• M63: 18,307,039 km (0.102 R)
• M64: 18,532,633 km (0.07 R)
• M65: 19,215,099 km (0.041 R)
• M66: 20,038,336 km (0.067 R)
• M67: 21,007,730 km (0.075 R)
• M68: 21,379,331 km (0.104 R)
• M69: 21,651,001 km (0.06 R)
• M70: 21,787,284 km (0.111 R)
• M71: 21,855,501 km (0.107 R)
• M72: 21,957,975 km (0.042 R)
• M73: 22,060,600 km (0.079 R)
• M74: 22,541,856 km (0.089 R)
• M75: 22,783,756 km (0.074 R)
• M76: 23,026,553 km (0.111 R)

Planet 6 - Gas Giant

Semi-Major Axis: 4.45 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 154.8

Radius: 13.5

Gravity: 0.85 G

Time & Orbit

Eccentricity (e): 0.078

Orbit Range: 4.1 AU - 4.8 AU

Year: 6158 Days

Day: 9.5 Hours

Environment

Temp: -210 °C

Axial Tilt: 38.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 29,491,710 km

• M1: 173,234 km (0.102 R)
• M2: 287,826 km (0.098 R)
• M3: 556,205 km (0.1 R)
• M4: 660,175 km (0.113 R)
• M5: 953,686 km (0.116 R)
• M6: 1,161,927 km (0.049 R)
• M7: 1,277,865 km (0.101 R)
• M8: 2,128,030 km (0.107 R)
• M9: 2,243,370 km (0.1 R)
• M10: 2,480,482 km (0.091 R)
• M11: 2,632,923 km (0.117 R)
• M12: 2,867,492 km (0.074 R)
• M13: 3,142,004 km (0.061 R)
• M14: 3,290,704 km (0.119 R)
• M15: 3,892,088 km (0.117 R)
• M16: 4,106,162 km (0.112 R)
• M17: 4,602,378 km (0.111 R)
• M18: 4,963,059 km (0.053 R)
• M19: 5,117,743 km (0.08 R)
• M20: 5,313,417 km (0.048 R)
• M21: 5,471,692 km (0.116 R)
• M22: 5,651,658 km (0.088 R)
• M23: 5,894,754 km (0.052 R)
• M24: 6,100,003 km (0.12 R)
• M25: 6,496,587 km (0.116 R)
• M26: 7,161,699 km (0.083 R)
• M27: 7,447,132 km (0.104 R)
• M28: 7,602,414 km (0.09 R)
• M29: 8,348,908 km (0.097 R)
• M30: 8,510,324 km (0.057 R)
• M31: 8,789,473 km (0.046 R)
• M32: 8,906,608 km (0.091 R)
• M33: 9,237,519 km (0.088 R)
• M34: 9,911,607 km (0.061 R)
• M35: 10,033,679 km (0.058 R)
• M36: 10,131,665 km (0.09 R)
• M37: 10,254,635 km (0.101 R)
• M38: 10,353,369 km (0.097 R)
• M39: 10,601,552 km (0.099 R)
• M40: 10,776,432 km (0.107 R)
• M41: 10,977,492 km (0.053 R)
• M42: 11,383,500 km (0.062 R)
• M43: 11,562,719 km (0.107 R)
• M44: 11,846,207 km (0.103 R)
• M45: 11,949,878 km (0.085 R)
• M46: 12,262,537 km (0.106 R)
• M47: 12,499,052 km (0.113 R)
• M48: 12,630,997 km (0.055 R)
• M49: 12,736,912 km (0.053 R)
• M50: 12,843,127 km (0.095 R)
• M51: 13,163,565 km (0.102 R)
• M52: 13,324,682 km (0.114 R)
• M53: 13,432,542 km (0.067 R)
• M54: 14,582,501 km (0.101 R)
• M55: 15,000,777 km (0.084 R)
• M56: 15,112,975 km (0.107 R)
• M57: 15,394,818 km (0.059 R)
• M58: 15,849,296 km (0.116 R)
• M59: 16,452,624 km (0.06 R)
• M60: 16,742,545 km (0.118 R)
• M61: 17,151,396 km (0.119 R)
• M62: 17,563,388 km (0.11 R)
• M63: 17,800,351 km (0.064 R)
• M64: 18,217,580 km (0.077 R)
• M65: 18,337,408 km (0.09 R)
• M66: 18,427,316 km (0.097 R)
• M67: 18,607,881 km (0.101 R)
• M68: 19,213,752 km (0.097 R)
• M69: 19,366,192 km (0.104 R)
• M70: 19,611,084 km (0.032 R)
• M71: 20,975,865 km (0.097 R)

Planet 7 - Gas Giant

Semi-Major Axis: 4.56 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 391

Radius: 11.3

Gravity: 3.06 G

Time & Orbit

Eccentricity (e): 0.243

Orbit Range: 3.45 AU - 5.67 AU

Year: 6388 Days

Day: 11.1 Hours

Environment

Temp: -209 °C

Axial Tilt: 25.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 29,491,710 km

• M1: 154,235 km (0.056 R)
• M2: 249,679 km (0.116 R)
• M3: 393,143 km (0.109 R)
• M4: 468,690 km (0.058 R)
• M5: 919,877 km (0.12 R)
• M6: 1,153,400 km (0.103 R)
• M7: 1,391,260 km (0.098 R)
• M8: 1,516,324 km (0.114 R)
• M9: 1,727,706 km (0.103 R)
• M10: 1,845,739 km (0.104 R)
• M11: 2,018,973 km (0.03 R)
• M12: 2,089,882 km (0.032 R)
• M13: 2,179,641 km (0.092 R)
• M14: 2,457,145 km (0.106 R)
• M15: 2,726,571 km (0.07 R)
• M16: 3,005,571 km (0.111 R)
• M17: 3,314,939 km (0.116 R)
• M18: 3,441,649 km (0.041 R)
• M19: 3,853,492 km (0.112 R)
• M20: 4,009,373 km (0.092 R)
• M21: 4,099,281 km (0.116 R)
• M22: 4,373,344 km (0.068 R)
• M23: 4,843,381 km (0.119 R)
• M24: 4,963,358 km (0.066 R)
• M25: 5,060,148 km (0.119 R)
• M26: 5,679,334 km (0.101 R)
• M27: 6,666,231 km (0.109 R)
• M28: 6,907,682 km (0.078 R)
• M29: 7,705,487 km (0.074 R)
• M30: 7,789,711 km (0.092 R)
• M31: 9,059,946 km (0.11 R)
• M32: 10,580,010 km (0.08 R)
• M33: 10,736,490 km (0.056 R)
• M34: 10,925,132 km (0.03 R)
• M35: 11,305,709 km (0.087 R)
• M36: 11,787,564 km (0.108 R)
• M37: 11,949,728 km (0.066 R)
• M38: 12,705,048 km (0.041 R)
• M39: 12,804,830 km (0.041 R)
• M40: 13,138,882 km (0.088 R)
• M41: 14,782,514 km (0.089 R)
• M42: 15,415,612 km (0.072 R)
• M43: 15,949,826 km (0.055 R)
• M44: 16,093,290 km (0.105 R)
• M45: 16,309,459 km (0.11 R)
• M46: 16,780,842 km (0.106 R)
• M47: 17,000,003 km (0.07 R)
• M48: 18,484,911 km (0.046 R)
• M49: 18,976,340 km (0.093 R)
• M50: 19,204,627 km (0.058 R)
• M51: 19,472,257 km (0.095 R)
• M52: 19,702,488 km (0.106 R)
• M53: 19,817,978 km (0.111 R)
• M54: 19,933,617 km (0.099 R)
• M55: 20,165,793 km (0.031 R)
• M56: 20,243,285 km (0.064 R)
• M57: 20,321,076 km (0.059 R)
• M58: 20,554,598 km (0.074 R)
• M59: 20,945,946 km (0.077 R)
• M60: 21,418,825 km (0.112 R)
• M61: 21,577,249 km (0.087 R)
• M62: 22,939,188 km (0.115 R)
• M63: 23,223,125 km (0.03 R)
• M64: 23,345,197 km (0.081 R)
• M65: 24,287,813 km (0.112 R)
• M66: 24,784,478 km (0.098 R)
• M67: 25,284,583 km (0.085 R)
• M68: 25,410,096 km (0.054 R)
• M69: 25,872,204 km (0.076 R)
• M70: 26,040,950 km (0.109 R)
• M71: 27,061,058 km (0.089 R)
• M72: 28,354,481 km (0.1 R)
• M73: 28,484,931 km (0.091 R)
• M74: 28,702,745 km (0.087 R)
• M75: 29,008,822 km (0.061 R)

Kuiper Belt

Range: 30 - 52 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 426 - 20,138 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit