G0V Star System Generated (Seed: 1766043403)
Star Details
Spectral Class: G2V
Temperature: 5,800 K
Mass: 1.05 sol
Luminosity: 1.19 lux
Habitable Zone (HZ)
Inner Boundary: 1.04 AU
Outer Boundary: 1.5 AU
Physical Limits
Snow Line: 5.24 AU
Max System Radius: 20.5 AU
Planetary System (10 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.92 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.02
Radius: 1.74
Gravity: 1.33 G
Time & Orbit
Eccentricity (e): 0.241
Orbit Range: 0.7 AU - 1.14 AU
Year: 315 Days
Day: 37.5 Hours
Environment
Temp: 170 °C
Axial Tilt: 1.8 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 2 - Terrestrial
Semi-Major Axis: 1.13 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.36
Radius: 1.41
Gravity: 1.19 G
Time & Orbit
Eccentricity (e): 0.089
Orbit Range: 1.03 AU - 1.23 AU
Year: 428 Days
Day: 18.8 Hours
Environment
Temp: 31 °C
Axial Tilt: 9.5 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Planet 3 - Terrestrial
Semi-Major Axis: 1.16 AU
Status: HZ
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.79
Radius: 0.91
Gravity: 0.95 G
Time & Orbit
Eccentricity (e): 0.11
Orbit Range: 1.03 AU - 1.29 AU
Year: 445 Days
Day: 30.2 Hours
Environment
Temp: 30 °C
Axial Tilt: 17.4 °
Atmosphere: Nâ‚‚, Oâ‚‚
Biome: Arid/Tundra
Satellites (1)
Outer Limit: 60,088,770 km
- M1: 448,943 km (0.097 R)
Planet 4 - Terrestrial
Semi-Major Axis: 3.55 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.79
Radius: 1.26
Gravity: 1.13 G
Time & Orbit
Eccentricity (e): 0.043
Orbit Range: 3.4 AU - 3.7 AU
Year: 2384 Days
Day: 17.9 Hours
Environment
Temp: -106 °C
Axial Tilt: 31.3 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 60,088,770 km
- M1: 2,272,392 km (0.103 R)
Planet 5 - Terrestrial
Semi-Major Axis: 3.77 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.6
Radius: 0.82
Gravity: 0.89 G
Time & Orbit
Eccentricity (e): 0.1
Orbit Range: 3.39 AU - 4.15 AU
Year: 2609 Days
Day: 23.7 Hours
Environment
Temp: -118 °C
Axial Tilt: 36 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 60,088,770 km
- M1: 357,838 km (0.097 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.34 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 781.6
Radius: 12.3
Gravity: 5.17 G
Time & Orbit
Eccentricity (e): 0.085
Orbit Range: 4.89 AU - 5.79 AU
Year: 4399 Days
Day: 9.1 Hours
Environment
Temp: -130 °C
Axial Tilt: 6.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (77)
Outer Limit: 60,088,770 km
- M1: 157,676 km (0.116 R)
- M2: 260,151 km (0.117 R)
- M3: 524,640 km (0.058 R)
- M4: 721,361 km (0.057 R)
- M5: 867,069 km (0.037 R)
- M6: 943,963 km (0.066 R)
- M7: 1,064,239 km (0.116 R)
- M8: 1,262,157 km (0.03 R)
- M9: 1,519,316 km (0.116 R)
- M10: 1,678,638 km (0.097 R)
- M11: 1,793,678 km (0.101 R)
- M12: 2,615,270 km (0.102 R)
- M13: 2,886,491 km (0.094 R)
- M14: 3,187,482 km (0.12 R)
- M15: 3,269,461 km (0.04 R)
- M16: 3,540,982 km (0.09 R)
- M17: 3,647,495 km (0.112 R)
- M18: 3,733,364 km (0.104 R)
- M19: 3,863,664 km (0.118 R)
- M20: 4,039,591 km (0.073 R)
- M21: 4,150,892 km (0.108 R)
- M22: 4,445,301 km (0.032 R)
- M23: 4,699,767 km (0.102 R)
- M24: 5,102,634 km (0.112 R)
- M25: 5,271,829 km (0.097 R)
- M26: 5,393,751 km (0.106 R)
- M27: 6,119,750 km (0.089 R)
- M28: 6,533,537 km (0.118 R)
- M29: 6,691,064 km (0.073 R)
- M30: 6,770,351 km (0.043 R)
- M31: 7,470,319 km (0.077 R)
- M32: 8,306,571 km (0.098 R)
- M33: 8,506,135 km (0.031 R)
- M34: 9,143,272 km (0.106 R)
- M35: 9,231,385 km (0.098 R)
- M36: 9,526,991 km (0.116 R)
- M37: 9,735,979 km (0.038 R)
- M38: 10,006,751 km (0.107 R)
- M39: 10,310,435 km (0.064 R)
- M40: 10,771,944 km (0.102 R)
- M41: 11,051,991 km (0.114 R)
- M42: 11,271,601 km (0.091 R)
- M43: 11,778,888 km (0.112 R)
- M44: 12,067,462 km (0.105 R)
- M45: 12,881,573 km (0.079 R)
- M46: 13,478,619 km (0.116 R)
- M47: 13,814,316 km (0.12 R)
- M48: 14,837,715 km (0.068 R)
- M49: 14,941,536 km (0.078 R)
- M50: 15,184,333 km (0.078 R)
- M51: 15,498,639 km (0.078 R)
- M52: 16,098,077 km (0.078 R)
- M53: 16,204,591 km (0.11 R)
- M54: 16,454,270 km (0.101 R)
- M55: 16,597,435 km (0.109 R)
- M56: 17,501,904 km (0.1 R)
- M57: 18,273,978 km (0.093 R)
- M58: 18,757,479 km (0.097 R)
- M59: 19,282,866 km (0.117 R)
- M60: 20,003,778 km (0.057 R)
- M61: 20,348,302 km (0.117 R)
- M62: 20,849,605 km (0.118 R)
- M63: 21,628,561 km (0.104 R)
- M64: 21,903,522 km (0.101 R)
- M65: 22,417,091 km (0.081 R)
- M66: 22,536,171 km (0.119 R)
- M67: 23,255,139 km (0.117 R)
- M68: 23,375,714 km (0.081 R)
- M69: 23,536,831 km (0.12 R)
- M70: 23,698,247 km (0.101 R)
- M71: 23,860,112 km (0.106 R)
- M72: 24,062,818 km (0.086 R)
- M73: 24,184,889 km (0.096 R)
- M74: 25,085,469 km (0.108 R)
- M75: 25,374,342 km (0.063 R)
- M76: 25,913,792 km (0.106 R)
- M77: 26,919,538 km (0.055 R)
Planet 7 - Gas Giant
Semi-Major Axis: 5.86 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 71
Radius: 12.1
Gravity: 0.48 G
Time & Orbit
Eccentricity (e): 0.179
Orbit Range: 4.81 AU - 6.91 AU
Year: 5056 Days
Day: 11.9 Hours
Environment
Temp: -141 °C
Axial Tilt: 10.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (58)
Outer Limit: 60,088,770 km
- M1: 151,692 km (0.104 R)
- M2: 243,097 km (0.103 R)
- M3: 353,051 km (0.042 R)
- M4: 440,865 km (0.104 R)
- M5: 525,986 km (0.04 R)
- M6: 767,886 km (0.111 R)
- M7: 859,739 km (0.074 R)
- M8: 1,080,994 km (0.112 R)
- M9: 1,194,539 km (0.082 R)
- M10: 1,330,823 km (0.032 R)
- M11: 1,570,030 km (0.084 R)
- M12: 1,833,771 km (0.098 R)
- M13: 1,917,994 km (0.115 R)
- M14: 2,090,331 km (0.029 R)
- M15: 2,427,674 km (0.073 R)
- M16: 2,567,548 km (0.091 R)
- M17: 2,734,200 km (0.097 R)
- M18: 2,830,990 km (0.072 R)
- M19: 2,941,393 km (0.074 R)
- M20: 3,488,922 km (0.108 R)
- M21: 3,727,680 km (0.11 R)
- M22: 3,835,540 km (0.114 R)
- M23: 4,193,378 km (0.074 R)
- M24: 4,404,760 km (0.041 R)
- M25: 5,074,958 km (0.06 R)
- M26: 5,194,786 km (0.036 R)
- M27: 5,855,261 km (0.072 R)
- M28: 6,107,931 km (0.094 R)
- M29: 6,672,963 km (0.076 R)
- M30: 6,771,548 km (0.088 R)
- M31: 6,854,126 km (0.107 R)
- M32: 6,970,214 km (0.103 R)
- M33: 7,086,900 km (0.093 R)
- M34: 7,356,326 km (0.103 R)
- M35: 7,680,654 km (0.065 R)
- M36: 8,079,482 km (0.04 R)
- M37: 8,184,649 km (0.096 R)
- M38: 8,414,132 km (0.09 R)
- M39: 8,538,448 km (0.032 R)
- M40: 8,897,483 km (0.116 R)
- M41: 9,060,545 km (0.08 R)
- M42: 9,169,901 km (0.109 R)
- M43: 9,298,106 km (0.119 R)
- M44: 9,389,959 km (0.112 R)
- M45: 9,593,113 km (0.061 R)
- M46: 9,891,262 km (0.066 R)
- M47: 10,306,246 km (0.077 R)
- M48: 10,420,539 km (0.102 R)
- M49: 10,515,982 km (0.087 R)
- M50: 11,605,204 km (0.079 R)
- M51: 11,803,422 km (0.057 R)
- M52: 12,243,688 km (0.056 R)
- M53: 12,750,526 km (0.067 R)
- M54: 13,243,451 km (0.109 R)
- M55: 13,388,411 km (0.11 R)
- M56: 13,575,558 km (0.03 R)
- M57: 13,742,808 km (0.059 R)
- M58: 14,036,918 km (0.03 R)
Planet 8 - Gas Giant
Semi-Major Axis: 8.38 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 341.3
Radius: 13.7
Gravity: 1.82 G
Time & Orbit
Eccentricity (e): 0.207
Orbit Range: 6.65 AU - 10.11 AU
Year: 8647 Days
Day: 7.5 Hours
Environment
Temp: -160 °C
Axial Tilt: 32.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 60,088,770 km
- M1: 221,255 km (0.108 R)
- M2: 331,210 km (0.117 R)
- M3: 434,731 km (0.078 R)
- M4: 674,836 km (0.106 R)
- M5: 917,933 km (0.112 R)
- M6: 1,020,856 km (0.115 R)
- M7: 1,191,248 km (0.119 R)
- M8: 1,422,377 km (0.106 R)
- M9: 1,561,503 km (0.104 R)
- M10: 1,816,268 km (0.045 R)
- M11: 2,006,855 km (0.078 R)
- M12: 2,305,303 km (0.116 R)
- M13: 2,575,926 km (0.11 R)
- M14: 2,725,972 km (0.107 R)
- M15: 3,355,779 km (0.086 R)
- M16: 3,615,631 km (0.117 R)
- M17: 4,434,530 km (0.08 R)
- M18: 5,866,181 km (0.057 R)
- M19: 6,036,723 km (0.051 R)
- M20: 6,151,315 km (0.085 R)
- M21: 6,324,699 km (0.06 R)
- M22: 6,587,841 km (0.072 R)
- M23: 6,676,254 km (0.099 R)
- M24: 7,337,626 km (0.086 R)
- M25: 7,490,814 km (0.081 R)
- M26: 7,831,897 km (0.062 R)
- M27: 8,146,202 km (0.11 R)
- M28: 8,496,860 km (0.093 R)
- M29: 9,378,739 km (0.104 R)
- M30: 9,578,602 km (0.045 R)
- M31: 9,915,048 km (0.088 R)
- M32: 10,084,692 km (0.08 R)
- M33: 11,017,584 km (0.072 R)
- M34: 11,228,667 km (0.114 R)
- M35: 11,405,491 km (0.088 R)
- M36: 12,231,421 km (0.102 R)
- M37: 12,413,482 km (0.076 R)
- M38: 13,076,499 km (0.028 R)
- M39: 13,412,347 km (0.104 R)
- M40: 13,788,885 km (0.077 R)
- M41: 14,092,568 km (0.119 R)
- M42: 14,513,985 km (0.106 R)
- M43: 14,668,221 km (0.07 R)
- M44: 15,723,484 km (0.066 R)
- M45: 16,040,931 km (0.119 R)
- M46: 16,200,402 km (0.07 R)
- M47: 16,762,741 km (0.107 R)
- M48: 16,965,296 km (0.104 R)
- M49: 18,404,876 km (0.06 R)
- M50: 18,781,414 km (0.074 R)
- M51: 19,202,831 km (0.099 R)
- M52: 20,745,485 km (0.059 R)
- M53: 21,575,753 km (0.1 R)
- M54: 22,194,490 km (0.077 R)
- M55: 23,857,719 km (0.088 R)
- M56: 24,176,811 km (0.105 R)
- M57: 24,727,331 km (0.087 R)
- M58: 25,653,940 km (0.09 R)
- M59: 26,309,329 km (0.089 R)
- M60: 26,403,426 km (0.064 R)
- M61: 26,497,672 km (0.074 R)
- M62: 27,398,102 km (0.106 R)
- M63: 27,636,711 km (0.064 R)
- M64: 28,019,980 km (0.111 R)
- M65: 28,791,756 km (0.116 R)
- M66: 29,717,318 km (0.099 R)
- M67: 30,553,720 km (0.114 R)
- M68: 30,950,004 km (0.027 R)
- M69: 31,597,613 km (0.116 R)
- M70: 32,602,762 km (0.082 R)
- M71: 33,771,570 km (0.088 R)
- M72: 33,925,057 km (0.068 R)
- M73: 34,284,092 km (0.069 R)
Planet 9 - Gas Giant
Semi-Major Axis: 9.29 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 628.2
Radius: 12.5
Gravity: 4.02 G
Time & Orbit
Eccentricity (e): 0.234
Orbit Range: 7.12 AU - 11.46 AU
Year: 10093 Days
Day: 13.9 Hours
Environment
Temp: -162 °C
Axial Tilt: 34.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (75)
Outer Limit: 60,088,770 km
- M1: 182,809 km (0.077 R)
- M2: 410,347 km (0.109 R)
- M3: 709,244 km (0.045 R)
- M4: 1,232,088 km (0.102 R)
- M5: 1,374,655 km (0.115 R)
- M6: 1,458,729 km (0.086 R)
- M7: 1,929,513 km (0.084 R)
- M8: 2,145,533 km (0.07 R)
- M9: 2,344,498 km (0.049 R)
- M10: 2,446,224 km (0.079 R)
- M11: 3,901,812 km (0.088 R)
- M12: 4,207,889 km (0.04 R)
- M13: 4,522,044 km (0.11 R)
- M14: 4,649,801 km (0.087 R)
- M15: 5,543,798 km (0.082 R)
- M16: 6,490,453 km (0.085 R)
- M17: 7,261,181 km (0.083 R)
- M18: 9,129,808 km (0.05 R)
- M19: 9,701,721 km (0.114 R)
- M20: 9,784,299 km (0.109 R)
- M21: 9,908,765 km (0.055 R)
- M22: 10,285,153 km (0.105 R)
- M23: 10,411,713 km (0.032 R)
- M24: 12,103,515 km (0.078 R)
- M25: 13,049,422 km (0.098 R)
- M26: 13,232,380 km (0.062 R)
- M27: 13,739,667 km (0.106 R)
- M28: 14,821,110 km (0.109 R)
- M29: 15,155,760 km (0.048 R)
- M30: 15,396,164 km (0.076 R)
- M31: 15,735,003 km (0.106 R)
- M32: 16,518,896 km (0.06 R)
- M33: 16,965,296 km (0.101 R)
- M34: 17,466,150 km (0.079 R)
- M35: 17,718,372 km (0.113 R)
- M36: 18,226,406 km (0.064 R)
- M37: 18,687,766 km (0.101 R)
- M38: 19,465,226 km (0.108 R)
- M39: 19,569,795 km (0.064 R)
- M40: 19,831,741 km (0.112 R)
- M41: 20,094,884 km (0.108 R)
- M42: 20,465,288 km (0.115 R)
- M43: 20,784,530 km (0.094 R)
- M44: 21,535,960 km (0.042 R)
- M45: 21,969,345 km (0.095 R)
- M46: 22,296,366 km (0.114 R)
- M47: 23,231,353 km (0.117 R)
- M48: 24,179,205 km (0.108 R)
- M49: 25,139,773 km (0.033 R)
- M50: 25,481,753 km (0.066 R)
- M51: 25,825,230 km (0.116 R)
- M52: 27,156,352 km (0.04 R)
- M53: 27,565,951 km (0.059 R)
- M54: 28,095,378 km (0.109 R)
- M55: 29,584,026 km (0.118 R)
- M56: 30,126,318 km (0.109 R)
- M57: 30,854,262 km (0.104 R)
- M58: 31,281,663 km (0.104 R)
- M59: 32,761,634 km (0.098 R)
- M60: 34,454,035 km (0.111 R)
- M61: 35,024,452 km (0.08 R)
- M62: 35,597,861 km (0.066 R)
- M63: 35,853,822 km (0.056 R)
- M64: 36,625,149 km (0.062 R)
- M65: 37,142,459 km (0.114 R)
- M66: 39,037,864 km (0.12 R)
- M67: 40,296,730 km (0.09 R)
- M68: 40,630,183 km (0.049 R)
- M69: 40,763,924 km (0.073 R)
- M70: 42,446,900 km (0.048 R)
- M71: 42,854,255 km (0.094 R)
- M72: 43,946,618 km (0.049 R)
- M73: 44,083,949 km (0.09 R)
- M74: 45,602,517 km (0.108 R)
- M75: 46,298,447 km (0.112 R)
Planet 10 - Ice Giant
Semi-Major Axis: 14.57 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 343.4
Radius: 3.3
Gravity: 31.53 G
Time & Orbit
Eccentricity (e): 0.062
Orbit Range: 13.67 AU - 15.47 AU
Year: 19824 Days
Day: 20.7 Hours
Environment
Temp: -185 °C
Axial Tilt: 107.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (90)
Outer Limit: 60,088,770 km
- M1: 101,128 km (0.112 R)
- M2: 417,528 km (0.099 R)
- M3: 753,076 km (0.045 R)
- M4: 968,048 km (0.114 R)
- M5: 1,153,100 km (0.077 R)
- M6: 1,299,108 km (0.099 R)
- M7: 1,374,356 km (0.117 R)
- M8: 1,997,132 km (0.104 R)
- M9: 3,288,161 km (0.078 R)
- M10: 3,529,463 km (0.113 R)
- M11: 3,848,106 km (0.102 R)
- M12: 4,399,374 km (0.044 R)
- M13: 4,741,804 km (0.12 R)
- M14: 4,780,400 km (0.056 R)
- M15: 4,896,787 km (0.077 R)
- M16: 5,014,072 km (0.113 R)
- M17: 5,655,398 km (0.118 R)
- M18: 5,985,560 km (0.074 R)
- M19: 6,237,334 km (0.104 R)
- M20: 6,578,417 km (0.074 R)
- M21: 7,145,393 km (0.115 R)
- M22: 7,547,063 km (0.099 R)
- M23: 8,418,770 km (0.108 R)
- M24: 8,700,612 km (0.114 R)
- M25: 10,255,233 km (0.093 R)
- M26: 10,657,053 km (0.065 R)
- M27: 10,809,045 km (0.068 R)
- M28: 10,859,908 km (0.109 R)
- M29: 10,910,771 km (0.067 R)
- M30: 11,166,583 km (0.085 R)
- M31: 11,269,507 km (0.064 R)
- M32: 12,421,410 km (0.065 R)
- M33: 12,581,480 km (0.099 R)
- M34: 12,688,443 km (0.117 R)
- M35: 13,173,888 km (0.035 R)
- M36: 13,555,512 km (0.07 R)
- M37: 16,560,933 km (0.082 R)
- M38: 17,031,718 km (0.047 R)
- M39: 17,806,335 km (0.097 R)
- M40: 18,167,614 km (0.062 R)
- M41: 18,409,813 km (0.077 R)
- M42: 18,836,317 km (0.069 R)
- M43: 19,327,596 km (0.075 R)
- M44: 19,947,829 km (0.104 R)
- M45: 20,197,657 km (0.12 R)
- M46: 21,590,413 km (0.119 R)
- M47: 21,975,478 km (0.117 R)
- M48: 22,687,564 km (0.119 R)
- M49: 24,134,325 km (0.101 R)
- M50: 25,003,040 km (0.082 R)
- M51: 25,475,021 km (0.096 R)
- M52: 26,086,278 km (0.116 R)
- M53: 26,291,078 km (0.097 R)
- M54: 26,359,444 km (0.117 R)
- M55: 27,323,153 km (0.05 R)
- M56: 30,282,499 km (0.113 R)
- M57: 30,929,659 km (0.095 R)
- M58: 32,604,407 km (0.042 R)
- M59: 33,489,727 km (0.109 R)
- M60: 33,786,679 km (0.072 R)
- M61: 33,861,029 km (0.12 R)
- M62: 34,308,327 km (0.098 R)
- M63: 35,058,111 km (0.112 R)
- M64: 37,416,671 km (0.092 R)
- M65: 37,724,693 km (0.025 R)
- M66: 38,498,414 km (0.052 R)
- M67: 38,809,428 km (0.106 R)
- M68: 39,277,370 km (0.088 R)
- M69: 39,512,089 km (0.059 R)
- M70: 40,376,764 km (0.113 R)
- M71: 41,009,414 km (0.097 R)
- M72: 43,249,642 km (0.117 R)
- M73: 45,119,316 km (0.098 R)
- M74: 48,433,059 km (0.112 R)
- M75: 48,936,755 km (0.107 R)
- M76: 49,695,814 km (0.075 R)
- M77: 50,034,354 km (0.088 R)
- M78: 50,119,027 km (0.074 R)
- M79: 50,203,849 km (0.041 R)
- M80: 50,628,557 km (0.102 R)
- M81: 51,139,883 km (0.118 R)
- M82: 51,396,144 km (0.088 R)
- M83: 51,567,284 km (0.072 R)
- M84: 52,253,489 km (0.098 R)
- M85: 54,679,069 km (0.029 R)
- M86: 55,466,403 km (0.093 R)
- M87: 55,993,436 km (0.059 R)
- M88: 57,141,001 km (0.113 R)
- M89: 57,762,131 km (0.092 R)
- M90: 59,279,951 km (0.103 R)
Kuiper Belt
Range: 30.8 - 57.8 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 438 - 19,757 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.