🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.52 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.4

Radius: 1.14

Gravity: 1.08 G

Time & Orbit

Eccentricity (e): 0.217

Orbit Range: 0.41 AU - 0.63 AU

Year: 141 Days

Day: 47.8 Hours

Environment

Temp: 207 °C

Axial Tilt: 4.2 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 1.22 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.69

Radius: 0.86

Gravity: 0.93 G

Time & Orbit

Eccentricity (e): 0.049

Orbit Range: 1.16 AU - 1.28 AU

Year: 508 Days

Day: 40.5 Hours

Environment

Temp: -5 °C

Axial Tilt: 27.6 °

Atmosphere: N₂, O₂

Biome: Oceanic/Continental

Satellites (1)

Outer Limit: 42,743,167 km

• M1: 82,428 km (0.069 R)

Planet 3 - Terrestrial

Semi-Major Axis: 1.62 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.81

Radius: 1.87

Gravity: 1.38 G

Time & Orbit

Eccentricity (e): 0.055

Orbit Range: 1.53 AU - 1.71 AU

Year: 777 Days

Day: 40.8 Hours

Environment

Temp: -52 °C

Axial Tilt: 16.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 1.89 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.57

Radius: 1.84

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.148

Orbit Range: 1.61 AU - 2.17 AU

Year: 979 Days

Day: 44.4 Hours

Environment

Temp: -79 °C

Axial Tilt: 34.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Terrestrial

Semi-Major Axis: 3.75 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.19

Radius: 1.59

Gravity: 1.26 G

Time & Orbit

Eccentricity (e): 0.205

Orbit Range: 2.98 AU - 4.52 AU

Year: 2736 Days

Day: 21.3 Hours

Environment

Temp: -131 °C

Axial Tilt: 38.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 6 - Gas Giant

Semi-Major Axis: 4.87 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 547.6

Radius: 10.4

Gravity: 5.06 G

Time & Orbit

Eccentricity (e): 0.194

Orbit Range: 3.93 AU - 5.81 AU

Year: 4049 Days

Day: 8.2 Hours

Environment

Temp: -143 °C

Axial Tilt: 38.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (72)

Outer Limit: 42,743,167 km

• M1: 150,047 km (0.089 R)
• M2: 219,310 km (0.08 R)
• M3: 416,480 km (0.112 R)
• M4: 512,223 km (0.118 R)
• M5: 606,919 km (0.12 R)
• M6: 698,024 km (0.025 R)
• M7: 816,206 km (0.057 R)
• M8: 941,569 km (0.113 R)
• M9: 1,123,480 km (0.068 R)
• M10: 1,251,386 km (0.106 R)
• M11: 1,330,523 km (0.09 R)
• M12: 1,480,271 km (0.101 R)
• M13: 1,592,918 km (0.059 R)
• M14: 1,796,970 km (0.104 R)
• M15: 1,963,322 km (0.114 R)
• M16: 2,714,005 km (0.069 R)
• M17: 2,870,634 km (0.079 R)
• M18: 3,012,303 km (0.1 R)
• M19: 3,120,163 km (0.089 R)
• M20: 3,229,369 km (0.099 R)
• M21: 3,489,221 km (0.104 R)
• M22: 3,679,060 km (0.117 R)
• M23: 3,891,789 km (0.066 R)
• M24: 4,128,602 km (0.107 R)
• M25: 4,288,971 km (0.111 R)
• M26: 4,451,584 km (0.094 R)
• M27: 4,803,887 km (0.093 R)
• M28: 4,909,353 km (0.075 R)
• M29: 5,143,773 km (0.089 R)
• M30: 5,513,579 km (0.117 R)
• M31: 5,579,701 km (0.061 R)
• M32: 6,187,069 km (0.102 R)
• M33: 6,487,012 km (0.116 R)
• M34: 6,580,362 km (0.044 R)
• M35: 6,650,523 km (0.034 R)
• M36: 7,077,326 km (0.045 R)
• M37: 7,173,367 km (0.106 R)
• M38: 7,269,858 km (0.067 R)
• M39: 8,283,683 km (0.109 R)
• M40: 8,486,687 km (0.062 R)
• M41: 8,742,799 km (0.11 R)
• M42: 8,949,543 km (0.104 R)
• M43: 9,079,544 km (0.118 R)
• M44: 9,605,978 km (0.112 R)
• M45: 10,115,210 km (0.105 R)
• M46: 10,937,250 km (0.109 R)
• M47: 11,440,796 km (0.077 R)
• M48: 11,866,253 km (0.103 R)
• M49: 11,980,545 km (0.099 R)
• M50: 13,202,910 km (0.11 R)
• M51: 13,828,977 km (0.092 R)
• M52: 13,949,253 km (0.1 R)
• M53: 14,312,477 km (0.046 R)
• M54: 15,017,233 km (0.09 R)
• M55: 15,764,624 km (0.12 R)
• M56: 15,984,832 km (0.081 R)
• M57: 16,237,951 km (0.081 R)
• M58: 16,428,539 km (0.079 R)
• M59: 16,683,903 km (0.104 R)
• M60: 16,811,958 km (0.091 R)
• M61: 17,360,384 km (0.066 R)
• M62: 17,620,535 km (0.113 R)
• M63: 17,685,759 km (0.117 R)
• M64: 18,078,753 km (0.059 R)
• M65: 18,507,800 km (0.113 R)
• M66: 20,189,130 km (0.041 R)
• M67: 20,462,745 km (0.072 R)
• M68: 20,531,261 km (0.07 R)
• M69: 21,221,206 km (0.117 R)
• M70: 21,883,775 km (0.083 R)
• M71: 22,659,440 km (0.111 R)
• M72: 23,803,714 km (0.115 R)

Planet 7 - Gas Giant

Semi-Major Axis: 5.05 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 589.1

Radius: 10.6

Gravity: 5.24 G

Time & Orbit

Eccentricity (e): 0.119

Orbit Range: 4.45 AU - 5.65 AU

Year: 4275 Days

Day: 12.2 Hours

Environment

Temp: -138 °C

Axial Tilt: 102.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 42,743,167 km

• M1: 132,693 km (0.068 R)
• M2: 245,939 km (0.046 R)
• M3: 322,533 km (0.079 R)
• M4: 402,418 km (0.074 R)
• M5: 588,219 km (0.106 R)
• M6: 747,241 km (0.092 R)
• M7: 873,502 km (0.112 R)
• M8: 1,032,674 km (0.093 R)
• M9: 1,380,190 km (0.117 R)
• M10: 1,641,986 km (0.059 R)
• M11: 1,935,796 km (0.115 R)
• M12: 2,179,791 km (0.08 R)
• M13: 2,331,034 km (0.105 R)
• M14: 2,626,340 km (0.034 R)
• M15: 3,157,861 km (0.086 R)
• M16: 3,233,857 km (0.028 R)
• M17: 3,310,451 km (0.089 R)
• M18: 3,387,644 km (0.113 R)
• M19: 3,583,318 km (0.096 R)
• M20: 3,924,700 km (0.088 R)
• M21: 4,068,314 km (0.045 R)
• M22: 4,192,780 km (0.094 R)
• M23: 4,574,104 km (0.098 R)
• M24: 4,768,881 km (0.1 R)
• M25: 5,234,280 km (0.117 R)
• M26: 5,460,921 km (0.064 R)
• M27: 5,552,624 km (0.119 R)
• M28: 5,760,565 km (0.069 R)
• M29: 5,924,225 km (0.117 R)
• M30: 6,113,167 km (0.057 R)
• M31: 6,376,011 km (0.113 R)
• M32: 6,496,886 km (0.088 R)
• M33: 6,593,975 km (0.078 R)
• M34: 7,112,182 km (0.092 R)
• M35: 7,592,391 km (0.098 R)
• M36: 7,797,639 km (0.083 R)
• M37: 7,952,922 km (0.072 R)
• M38: 8,345,317 km (0.076 R)
• M39: 8,637,332 km (0.102 R)
• M40: 8,986,643 km (0.084 R)
• M41: 9,203,859 km (0.108 R)
• M42: 9,423,020 km (0.074 R)
• M43: 9,810,479 km (0.092 R)
• M44: 9,950,054 km (0.109 R)
• M45: 10,146,775 km (0.05 R)
• M46: 10,486,811 km (0.117 R)
• M47: 11,529,657 km (0.065 R)
• M48: 11,944,044 km (0.086 R)
• M49: 12,183,101 km (0.08 R)
• M50: 12,303,228 km (0.116 R)
• M51: 12,453,873 km (0.089 R)
• M52: 12,635,485 km (0.068 R)
• M53: 12,818,144 km (0.112 R)
• M54: 13,588,124 km (0.098 R)
• M55: 13,681,473 km (0.068 R)
• M56: 13,868,919 km (0.112 R)
• M57: 14,851,029 km (0.108 R)
• M58: 15,172,665 km (0.092 R)
• M59: 15,561,619 km (0.111 R)
• M60: 15,921,103 km (0.068 R)
• M61: 16,814,950 km (0.065 R)
• M62: 17,251,178 km (0.053 R)
• M63: 18,100,594 km (0.098 R)
• M64: 18,203,518 km (0.115 R)
• M65: 18,547,593 km (0.064 R)
• M66: 19,242,625 km (0.069 R)
• M67: 19,593,132 km (0.09 R)
• M68: 19,946,034 km (0.112 R)
• M69: 20,622,066 km (0.099 R)
• M70: 20,980,802 km (0.12 R)
• M71: 21,125,015 km (0.06 R)
• M72: 21,887,066 km (0.049 R)
• M73: 22,106,377 km (0.119 R)
• M74: 22,436,838 km (0.101 R)
• M75: 22,658,093 km (0.088 R)
• M76: 23,214,149 km (0.109 R)
• M77: 23,288,649 km (0.115 R)
• M78: 23,512,746 km (0.118 R)
• M79: 23,699,893 km (0.092 R)
• M80: 24,302,324 km (0.117 R)
• M81: 25,752,974 km (0.087 R)

Planet 8 - Gas Giant

Semi-Major Axis: 5.37 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 162.1

Radius: 11.5

Gravity: 1.23 G

Time & Orbit

Eccentricity (e): 0.019

Orbit Range: 5.27 AU - 5.47 AU

Year: 4688 Days

Day: 14.4 Hours

Environment

Temp: -159 °C

Axial Tilt: 17.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (70)

Outer Limit: 42,743,167 km

• M1: 226,192 km (0.094 R)
• M2: 329,714 km (0.099 R)
• M3: 437,125 km (0.108 R)
• M4: 567,425 km (0.081 R)
• M5: 687,552 km (0.075 R)
• M6: 790,475 km (0.112 R)
• M7: 880,832 km (0.037 R)
• M8: 955,781 km (0.09 R)
• M9: 1,409,062 km (0.118 R)
• M10: 1,742,516 km (0.109 R)
• M11: 1,838,857 km (0.077 R)
• M12: 1,999,525 km (0.12 R)
• M13: 2,100,803 km (0.037 R)
• M14: 2,203,876 km (0.107 R)
• M15: 2,282,265 km (0.072 R)
• M16: 2,415,108 km (0.119 R)
• M17: 2,605,546 km (0.111 R)
• M18: 2,857,768 km (0.086 R)
• M19: 2,957,999 km (0.111 R)
• M20: 3,295,791 km (0.088 R)
• M21: 3,538,289 km (0.058 R)
• M22: 3,786,621 km (0.043 R)
• M23: 4,465,796 km (0.107 R)
• M24: 4,734,623 km (0.105 R)
• M25: 4,888,110 km (0.1 R)
• M26: 5,130,160 km (0.088 R)
• M27: 5,340,943 km (0.109 R)
• M28: 5,662,429 km (0.117 R)
• M29: 5,807,240 km (0.1 R)
• M30: 5,990,198 km (0.093 R)
• M31: 6,175,101 km (0.068 R)
• M32: 6,268,151 km (0.051 R)
• M33: 6,361,799 km (0.107 R)
• M34: 6,493,595 km (0.078 R)
• M35: 6,569,441 km (0.096 R)
• M36: 6,740,880 km (0.085 R)
• M37: 7,147,038 km (0.113 R)
• M38: 7,362,908 km (0.112 R)
• M39: 7,501,436 km (0.109 R)
• M40: 7,600,918 km (0.116 R)
• M41: 8,003,187 km (0.117 R)
• M42: 8,145,754 km (0.095 R)
• M43: 8,912,892 km (0.083 R)
• M44: 9,337,151 km (0.089 R)
• M45: 9,638,142 km (0.114 R)
• M46: 9,724,610 km (0.107 R)
• M47: 10,117,454 km (0.071 R)
• M48: 10,271,689 km (0.073 R)
• M49: 10,404,532 km (0.104 R)
• M50: 10,582,404 km (0.09 R)
• M51: 11,031,796 km (0.106 R)
• M52: 11,122,302 km (0.071 R)
• M53: 11,418,506 km (0.089 R)
• M54: 11,948,980 km (0.042 R)
• M55: 12,205,541 km (0.088 R)
• M56: 13,394,694 km (0.1 R)
• M57: 13,758,666 km (0.089 R)
• M58: 13,880,588 km (0.093 R)
• M59: 14,248,898 km (0.072 R)
• M60: 14,322,949 km (0.098 R)
• M61: 14,895,011 km (0.049 R)
• M62: 15,373,126 km (0.071 R)
• M63: 15,474,404 km (0.112 R)
• M64: 15,677,707 km (0.113 R)
• M65: 15,805,165 km (0.064 R)
• M66: 16,138,319 km (0.114 R)
• M67: 16,733,419 km (0.107 R)
• M68: 16,811,659 km (0.099 R)
• M69: 16,915,929 km (0.068 R)
• M70: 17,362,030 km (0.095 R)

Planet 9 - Gas Giant

Semi-Major Axis: 7.95 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 323.3

Radius: 9.2

Gravity: 3.82 G

Time & Orbit

Eccentricity (e): 0.127

Orbit Range: 6.94 AU - 8.96 AU

Year: 8445 Days

Day: 8.8 Hours

Environment

Temp: -160 °C

Axial Tilt: 0.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 42,743,167 km

• M1: 122,820 km (0.054 R)
• M2: 201,508 km (0.119 R)
• M3: 474,824 km (0.082 R)
• M4: 578,495 km (0.119 R)
• M5: 824,434 km (0.118 R)
• M6: 937,829 km (0.038 R)
• M7: 1,072,018 km (0.038 R)
• M8: 1,133,802 km (0.108 R)
• M9: 1,707,959 km (0.057 R)
• M10: 2,006,257 km (0.096 R)
• M11: 2,083,450 km (0.117 R)
• M12: 2,142,092 km (0.112 R)
• M13: 2,567,847 km (0.076 R)
• M14: 2,866,295 km (0.088 R)
• M15: 3,221,141 km (0.1 R)
• M16: 3,426,838 km (0.11 R)
• M17: 4,094,643 km (0.101 R)
• M18: 4,168,545 km (0.06 R)
• M19: 4,724,450 km (0.108 R)
• M20: 4,906,212 km (0.081 R)
• M21: 5,574,166 km (0.099 R)
• M22: 6,242,420 km (0.084 R)
• M23: 6,965,127 km (0.119 R)
• M24: 7,441,596 km (0.101 R)
• M25: 7,532,103 km (0.106 R)
• M26: 7,897,870 km (0.119 R)
• M27: 8,082,923 km (0.1 R)
• M28: 8,520,347 km (0.052 R)
• M29: 8,742,051 km (0.119 R)
• M30: 8,837,494 km (0.078 R)
• M31: 8,933,536 km (0.105 R)
• M32: 9,614,655 km (0.104 R)
• M33: 9,680,329 km (0.098 R)
• M34: 10,245,210 km (0.071 R)
• M35: 10,312,380 km (0.026 R)
• M36: 10,786,605 km (0.119 R)
• M37: 11,756,448 km (0.096 R)
• M38: 12,074,194 km (0.104 R)
• M39: 12,645,957 km (0.111 R)
• M40: 12,718,063 km (0.069 R)
• M41: 13,044,037 km (0.065 R)
• M42: 13,263,048 km (0.102 R)
• M43: 13,446,455 km (0.081 R)
• M44: 14,639,947 km (0.102 R)
• M45: 15,210,962 km (0.098 R)
• M46: 16,374,983 km (0.071 R)
• M47: 16,571,704 km (0.095 R)
• M48: 16,848,460 km (0.064 R)
• M49: 16,967,690 km (0.098 R)
• M50: 17,647,911 km (0.111 R)
• M51: 17,930,502 km (0.081 R)
• M52: 18,052,125 km (0.116 R)
• M53: 18,174,047 km (0.108 R)
• M54: 18,582,300 km (0.072 R)
• M55: 20,161,155 km (0.098 R)
• M56: 20,414,425 km (0.105 R)
• M57: 20,753,713 km (0.057 R)
• M58: 20,966,590 km (0.088 R)
• M59: 21,869,114 km (0.093 R)
• M60: 22,565,343 km (0.087 R)
• M61: 22,652,858 km (0.099 R)
• M62: 22,740,372 km (0.105 R)
• M63: 22,828,186 km (0.106 R)
• M64: 23,445,577 km (0.036 R)
• M65: 23,845,452 km (0.111 R)
• M66: 23,979,192 km (0.11 R)
• M67: 24,202,841 km (0.066 R)
• M68: 24,877,528 km (0.117 R)
• M69: 25,058,541 km (0.12 R)
• M70: 25,649,602 km (0.092 R)
• M71: 25,832,411 km (0.077 R)
• M72: 26,383,529 km (0.079 R)
• M73: 27,031,438 km (0.083 R)
• M74: 27,637,608 km (0.103 R)
• M75: 28,768,718 km (0.103 R)
• M76: 29,196,717 km (0.06 R)
• M77: 29,387,604 km (0.058 R)
• M78: 30,107,170 km (0.1 R)
• M79: 31,759,778 km (0.108 R)
• M80: 32,251,356 km (0.087 R)

Planet 10 - Gas Giant

Semi-Major Axis: 11.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 222.7

Radius: 10.4

Gravity: 2.06 G

Time & Orbit

Eccentricity (e): 0.193

Orbit Range: 9.31 AU - 13.77 AU

Year: 14768 Days

Day: 12.3 Hours

Environment

Temp: -177 °C

Axial Tilt: 32.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (86)

Outer Limit: 42,743,167 km

• M1: 207,642 km (0.117 R)
• M2: 328,966 km (0.111 R)
• M3: 664,065 km (0.085 R)
• M4: 885,021 km (0.097 R)
• M5: 1,039,855 km (0.072 R)
• M6: 1,377,048 km (0.067 R)
• M7: 1,878,650 km (0.117 R)
• M8: 2,313,980 km (0.055 R)
• M9: 2,385,488 km (0.098 R)
• M10: 2,580,264 km (0.068 R)
• M11: 3,011,405 km (0.064 R)
• M12: 3,089,944 km (0.037 R)
• M13: 3,169,081 km (0.056 R)
• M14: 3,302,672 km (0.085 R)
• M15: 3,383,605 km (0.05 R)
• M16: 3,998,153 km (0.107 R)
• M17: 4,201,007 km (0.11 R)
• M18: 5,014,969 km (0.117 R)
• M19: 5,811,428 km (0.096 R)
• M20: 6,107,931 km (0.119 R)
• M21: 6,207,863 km (0.103 R)
• M22: 6,409,222 km (0.095 R)
• M23: 6,578,866 km (0.119 R)
• M24: 7,166,486 km (0.098 R)
• M25: 8,727,091 km (0.113 R)
• M26: 9,257,266 km (0.042 R)
• M27: 10,748,607 km (0.113 R)
• M28: 11,072,038 km (0.105 R)
• M29: 11,563,167 km (0.074 R)
• M30: 11,769,912 km (0.105 R)
• M31: 12,019,591 km (0.104 R)
• M32: 12,187,140 km (0.058 R)
• M33: 12,566,670 km (0.109 R)
• M34: 13,208,146 km (0.043 R)
• M35: 13,728,896 km (0.109 R)
• M36: 14,168,115 km (0.086 R)
• M37: 14,567,242 km (0.109 R)
• M38: 17,133,295 km (0.113 R)
• M39: 17,558,601 km (0.057 R)
• M40: 17,748,740 km (0.11 R)
• M41: 17,844,034 km (0.115 R)
• M42: 18,855,166 km (0.102 R)
• M43: 19,049,942 km (0.079 R)
• M44: 19,441,440 km (0.088 R)
• M45: 20,932,931 km (0.078 R)
• M46: 21,539,849 km (0.102 R)
• M47: 21,641,576 km (0.069 R)
• M48: 22,101,141 km (0.065 R)
• M49: 22,306,539 km (0.096 R)
• M50: 23,395,013 km (0.098 R)
• M51: 25,408,151 km (0.103 R)
• M52: 25,515,712 km (0.054 R)
• M53: 25,623,273 km (0.04 R)
• M54: 25,785,138 km (0.099 R)
• M55: 26,218,074 km (0.106 R)
• M56: 26,598,950 km (0.074 R)
• M57: 26,762,760 km (0.077 R)
• M58: 26,926,869 km (0.114 R)
• M59: 27,256,134 km (0.073 R)
• M60: 27,421,290 km (0.11 R)
• M61: 27,918,553 km (0.052 R)
• M62: 28,418,958 km (0.045 R)
• M63: 28,586,508 km (0.03 R)
• M64: 29,034,553 km (0.082 R)
• M65: 29,146,901 km (0.036 R)
• M66: 29,484,992 km (0.047 R)
• M67: 30,051,370 km (0.09 R)
• M68: 30,564,191 km (0.103 R)
• M69: 30,850,222 km (0.07 R)
• M70: 31,829,789 km (0.102 R)
• M71: 32,003,622 km (0.054 R)
• M72: 32,469,021 km (0.12 R)
• M73: 33,112,441 km (0.093 R)
• M74: 34,174,437 km (0.109 R)
• M75: 34,530,929 km (0.07 R)
• M76: 34,709,698 km (0.102 R)
• M77: 35,668,022 km (0.058 R)
• M78: 35,788,448 km (0.089 R)
• M79: 35,908,874 km (0.092 R)
• M80: 37,060,778 km (0.092 R)
• M81: 40,086,844 km (0.111 R)
• M82: 41,661,212 km (0.112 R)
• M83: 41,787,921 km (0.063 R)
• M84: 42,041,938 km (0.056 R)
• M85: 42,232,825 km (0.096 R)
• M86: 42,743,104 km (0.049 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: 258 - 17,336 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit