Star System Generated (Seed: 1766531018)
Star Details
Spectral Class: M0V
Temperature: 3,700 K
Mass: 0.33 sol
Luminosity: 0.02 lux
Habitable Zone (HZ)
Inner Boundary: 0.13 AU
Outer Boundary: 0.19 AU
Physical Limits
Snow Line: 0.68 AU
Max System Radius: 11.5 AU
Planetary System (7 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.57 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.24
Radius: 1.6
Gravity: 1.27 G
Time & Orbit
Eccentricity (e): 0.083
Orbit Range: 0.52 AU - 0.62 AU
Year: 274 Days
Day: 44.3 Hours
Environment
Temp: -127 °C
Axial Tilt: 11 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 85,987,690 km
- M1: 562,488 km (0.063 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.81 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 601.5
Radius: 9.1
Gravity: 7.26 G
Time & Orbit
Eccentricity (e): 0.214
Orbit Range: 0.64 AU - 0.98 AU
Year: 464 Days
Day: 10.7 Hours
Environment
Temp: -147 °C
Axial Tilt: 28.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (43)
Outer Limit: 85,987,690 km
- M1: 138,976 km (0.077 R)
- M2: 239,656 km (0.065 R)
- M3: 427,401 km (0.102 R)
- M4: 579,243 km (0.051 R)
- M5: 720,912 km (0.115 R)
- M6: 796,160 km (0.095 R)
- M7: 874,549 km (0.048 R)
- M8: 932,743 km (0.092 R)
- M9: 1,025,194 km (0.103 R)
- M10: 1,096,552 km (0.062 R)
- M11: 1,254,827 km (0.046 R)
- M12: 1,383,780 km (0.105 R)
- M13: 1,479,373 km (0.065 R)
- M14: 1,582,895 km (0.116 R)
- M15: 1,660,686 km (0.044 R)
- M16: 1,722,769 km (0.104 R)
- M17: 1,814,622 km (0.112 R)
- M18: 1,973,196 km (0.114 R)
- M19: 2,033,035 km (0.097 R)
- M20: 2,297,973 km (0.042 R)
- M21: 2,646,237 km (0.077 R)
- M22: 2,732,555 km (0.119 R)
- M23: 2,867,342 km (0.086 R)
- M24: 3,032,050 km (0.064 R)
- M25: 3,108,644 km (0.087 R)
- M26: 3,242,384 km (0.094 R)
- M27: 3,299,231 km (0.119 R)
- M28: 3,486,528 km (0.076 R)
- M29: 3,581,373 km (0.111 R)
- M30: 3,662,455 km (0.083 R)
- M31: 3,773,905 km (0.068 R)
- M32: 3,863,963 km (0.102 R)
- M33: 4,030,915 km (0.107 R)
- M34: 4,107,509 km (0.099 R)
- M35: 4,254,563 km (0.098 R)
- M36: 4,553,909 km (0.088 R)
- M37: 4,909,054 km (0.103 R)
- M38: 4,991,034 km (0.049 R)
- M39: 5,073,462 km (0.065 R)
- M40: 5,148,112 km (0.082 R)
- M41: 5,620,392 km (0.095 R)
- M42: 5,740,669 km (0.088 R)
- M43: 5,853,166 km (0.106 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.12 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 535.3
Radius: 10.7
Gravity: 4.68 G
Time & Orbit
Eccentricity (e): 0.124
Orbit Range: 0.98 AU - 1.26 AU
Year: 754 Days
Day: 5.3 Hours
Environment
Temp: -165 °C
Axial Tilt: 0.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 85,987,690 km
- M1: 144,512 km (0.096 R)
- M2: 219,610 km (0.105 R)
- M3: 404,064 km (0.076 R)
- M4: 521,498 km (0.098 R)
- M5: 610,210 km (0.093 R)
- M6: 709,692 km (0.1 R)
- M7: 779,555 km (0.069 R)
- M8: 873,053 km (0.044 R)
- M9: 1,009,636 km (0.094 R)
- M10: 1,089,521 km (0.088 R)
- M11: 1,165,667 km (0.055 R)
- M12: 1,243,757 km (0.09 R)
- M13: 1,641,388 km (0.084 R)
- M14: 1,777,971 km (0.118 R)
- M15: 1,911,412 km (0.09 R)
- M16: 2,026,453 km (0.104 R)
- M17: 2,339,561 km (0.058 R)
- M18: 2,439,642 km (0.07 R)
- M19: 2,509,803 km (0.099 R)
- M20: 2,708,469 km (0.095 R)
- M21: 2,805,558 km (0.083 R)
- M22: 2,895,766 km (0.099 R)
- M23: 3,087,401 km (0.11 R)
- M24: 3,326,309 km (0.113 R)
- M25: 3,421,902 km (0.101 R)
- M26: 3,545,021 km (0.115 R)
- M27: 3,624,756 km (0.095 R)
- M28: 3,859,027 km (0.1 R)
- M29: 4,024,033 km (0.115 R)
- M30: 4,116,634 km (0.072 R)
- M31: 4,238,257 km (0.082 R)
- M32: 4,313,804 km (0.089 R)
- M33: 4,437,372 km (0.087 R)
- M34: 4,523,540 km (0.064 R)
- M35: 4,591,009 km (0.08 R)
- M36: 4,746,591 km (0.097 R)
- M37: 4,834,704 km (0.041 R)
- M38: 4,913,692 km (0.034 R)
- M39: 5,072,864 km (0.07 R)
- M40: 5,355,454 km (0.084 R)
- M41: 5,426,962 km (0.101 R)
- M42: 5,612,164 km (0.112 R)
- M43: 5,820,404 km (0.098 R)
- M44: 5,925,572 km (0.098 R)
- M45: 6,052,580 km (0.102 R)
- M46: 6,148,472 km (0.101 R)
- M47: 6,223,271 km (0.055 R)
- M48: 6,624,343 km (0.099 R)
- M49: 6,745,218 km (0.08 R)
- M50: 6,888,982 km (0.074 R)
- M51: 7,000,283 km (0.074 R)
- M52: 7,190,870 km (0.052 R)
- M53: 7,726,730 km (0.105 R)
- M54: 7,796,143 km (0.065 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.83 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 836.5
Radius: 9.3
Gravity: 9.67 G
Time & Orbit
Eccentricity (e): 0.062
Orbit Range: 1.72 AU - 1.94 AU
Year: 1574 Days
Day: 11.5 Hours
Environment
Temp: -178 °C
Axial Tilt: 4.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 85,987,690 km
- M1: 221,106 km (0.103 R)
- M2: 390,151 km (0.102 R)
- M3: 577,298 km (0.112 R)
- M4: 755,020 km (0.116 R)
- M5: 933,940 km (0.104 R)
- M6: 1,028,785 km (0.096 R)
- M7: 1,145,321 km (0.104 R)
- M8: 1,266,346 km (0.081 R)
- M9: 1,333,366 km (0.092 R)
- M10: 1,471,145 km (0.113 R)
- M11: 1,562,251 km (0.087 R)
- M12: 1,761,066 km (0.046 R)
- M13: 1,979,329 km (0.119 R)
- M14: 2,661,346 km (0.07 R)
- M15: 2,760,829 km (0.075 R)
- M16: 3,002,130 km (0.029 R)
- M17: 3,092,786 km (0.112 R)
- M18: 3,184,340 km (0.034 R)
- M19: 3,263,627 km (0.101 R)
- M20: 3,383,754 km (0.076 R)
- M21: 3,464,687 km (0.112 R)
- M22: 3,559,831 km (0.045 R)
- M23: 3,794,849 km (0.118 R)
- M24: 3,992,169 km (0.076 R)
- M25: 4,544,783 km (0.09 R)
- M26: 5,561,151 km (0.085 R)
- M27: 5,705,064 km (0.059 R)
- M28: 5,801,705 km (0.115 R)
- M29: 5,964,018 km (0.068 R)
- M30: 6,029,243 km (0.103 R)
- M31: 6,342,950 km (0.05 R)
- M32: 6,476,690 km (0.101 R)
- M33: 6,628,083 km (0.116 R)
- M34: 6,695,851 km (0.077 R)
- M35: 6,831,985 km (0.117 R)
- M36: 7,280,779 km (0.069 R)
- M37: 7,632,633 km (0.075 R)
- M38: 7,846,408 km (0.109 R)
- M39: 7,953,969 km (0.105 R)
- M40: 8,444,351 km (0.117 R)
- M41: 8,536,204 km (0.117 R)
- M42: 8,628,506 km (0.063 R)
- M43: 8,739,508 km (0.053 R)
- M44: 9,075,804 km (0.112 R)
- M45: 9,359,292 km (0.058 R)
- M46: 9,511,582 km (0.105 R)
- M47: 9,934,795 km (0.09 R)
- M48: 10,109,824 km (0.071 R)
- M49: 10,403,634 km (0.046 R)
- M50: 10,482,472 km (0.065 R)
- M51: 10,740,080 km (0.12 R)
- M52: 10,939,643 km (0.093 R)
- M53: 10,999,782 km (0.111 R)
- M54: 11,120,358 km (0.1 R)
- M55: 11,342,511 km (0.098 R)
- M56: 11,443,938 km (0.069 R)
- M57: 11,525,319 km (0.076 R)
- M58: 12,017,795 km (0.053 R)
- M59: 12,225,138 km (0.119 R)
- M60: 12,475,266 km (0.104 R)
- M61: 12,538,097 km (0.076 R)
- M62: 12,622,021 km (0.105 R)
- M63: 12,727,188 km (0.099 R)
- M64: 12,874,991 km (0.069 R)
- M65: 13,065,878 km (0.119 R)
- M66: 13,193,485 km (0.113 R)
- M67: 13,321,690 km (0.112 R)
- M68: 13,385,868 km (0.045 R)
- M69: 13,773,476 km (0.08 R)
- M70: 13,860,093 km (0.091 R)
- M71: 14,055,618 km (0.115 R)
- M72: 14,515,481 km (0.118 R)
- M73: 14,647,876 km (0.073 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.37 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 770.2
Radius: 11
Gravity: 6.37 G
Time & Orbit
Eccentricity (e): 0.098
Orbit Range: 2.14 AU - 2.6 AU
Year: 2320 Days
Day: 7 Hours
Environment
Temp: -193 °C
Axial Tilt: 47.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 85,987,690 km
- M1: 161,416 km (0.09 R)
- M2: 425,157 km (0.098 R)
- M3: 497,712 km (0.09 R)
- M4: 745,297 km (0.104 R)
- M5: 923,019 km (0.065 R)
- M6: 1,063,491 km (0.056 R)
- M7: 1,310,029 km (0.08 R)
- M8: 1,457,831 km (0.114 R)
- M9: 1,551,629 km (0.074 R)
- M10: 1,708,408 km (0.067 R)
- M11: 1,870,721 km (0.091 R)
- M12: 2,038,271 km (0.081 R)
- M13: 2,143,887 km (0.07 R)
- M14: 2,292,139 km (0.113 R)
- M15: 2,500,080 km (0.103 R)
- M16: 2,772,348 km (0.109 R)
- M17: 2,934,362 km (0.062 R)
- M18: 3,130,036 km (0.062 R)
- M19: 3,392,431 km (0.089 R)
- M20: 3,470,970 km (0.097 R)
- M21: 3,550,257 km (0.111 R)
- M22: 3,856,783 km (0.111 R)
- M23: 4,054,850 km (0.099 R)
- M24: 4,256,359 km (0.078 R)
- M25: 4,933,887 km (0.084 R)
- M26: 5,023,197 km (0.057 R)
- M27: 5,331,070 km (0.086 R)
- M28: 5,626,376 km (0.11 R)
- M29: 5,701,025 km (0.118 R)
- M30: 5,776,123 km (0.05 R)
- M31: 5,908,218 km (0.099 R)
- M32: 6,098,656 km (0.083 R)
- M33: 6,701,985 km (0.03 R)
- M34: 6,840,961 km (0.111 R)
- M35: 7,673,772 km (0.088 R)
- M36: 7,777,444 km (0.089 R)
- M37: 8,028,469 km (0.105 R)
- M38: 8,431,336 km (0.086 R)
- M39: 8,516,906 km (0.076 R)
- M40: 8,624,467 km (0.07 R)
- M41: 8,840,785 km (0.097 R)
- M42: 9,478,371 km (0.098 R)
- M43: 9,612,112 km (0.065 R)
- M44: 10,017,223 km (0.072 R)
- M45: 10,381,943 km (0.107 R)
- M46: 10,658,399 km (0.079 R)
- M47: 11,148,183 km (0.09 R)
- M48: 11,407,586 km (0.055 R)
- M49: 11,478,645 km (0.064 R)
- M50: 12,149,441 km (0.084 R)
- M51: 12,489,627 km (0.034 R)
- M52: 12,710,134 km (0.052 R)
- M53: 12,833,104 km (0.062 R)
- M54: 13,055,406 km (0.054 R)
- M55: 13,154,739 km (0.063 R)
- M56: 13,304,038 km (0.103 R)
- M57: 13,428,952 km (0.115 R)
- M58: 13,957,631 km (0.097 R)
- M59: 14,621,845 km (0.116 R)
- M60: 14,802,410 km (0.115 R)
- M61: 15,139,753 km (0.08 R)
- M62: 15,558,478 km (0.101 R)
- M63: 15,954,463 km (0.082 R)
- M64: 16,060,528 km (0.117 R)
- M65: 16,166,892 km (0.049 R)
- M66: 16,380,518 km (0.042 R)
- M67: 17,026,631 km (0.108 R)
- M68: 17,162,167 km (0.097 R)
- M69: 18,011,284 km (0.118 R)
- M70: 18,121,987 km (0.11 R)
- M71: 18,343,691 km (0.077 R)
- M72: 18,650,217 km (0.1 R)
Planet 6 - Gas Giant
Semi-Major Axis: 4.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 341.1
Radius: 14.2
Gravity: 1.69 G
Time & Orbit
Eccentricity (e): 0.219
Orbit Range: 3.13 AU - 4.89 AU
Year: 5106 Days
Day: 10.2 Hours
Environment
Temp: -213 °C
Axial Tilt: 29 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 85,987,690 km
- M1: 182,659 km (0.1 R)
- M2: 289,472 km (0.086 R)
- M3: 487,390 km (0.05 R)
- M4: 1,031,777 km (0.054 R)
- M5: 1,267,094 km (0.118 R)
- M6: 1,371,663 km (0.079 R)
- M7: 1,718,580 km (0.107 R)
- M8: 2,031,838 km (0.117 R)
- M9: 2,124,888 km (0.044 R)
- M10: 2,235,291 km (0.089 R)
- M11: 2,645,788 km (0.105 R)
- M12: 2,782,371 km (0.091 R)
- M13: 3,062,568 km (0.088 R)
- M14: 3,370,739 km (0.041 R)
- M15: 3,651,086 km (0.116 R)
- M16: 3,746,230 km (0.059 R)
- M17: 3,978,256 km (0.063 R)
- M18: 4,095,990 km (0.045 R)
- M19: 4,214,920 km (0.101 R)
- M20: 4,355,243 km (0.084 R)
- M21: 4,743,898 km (0.03 R)
- M22: 5,058,802 km (0.087 R)
- M23: 5,272,727 km (0.106 R)
- M24: 5,380,736 km (0.077 R)
- M25: 5,555,167 km (0.084 R)
- M26: 5,932,154 km (0.112 R)
- M27: 6,067,091 km (0.108 R)
- M28: 6,386,333 km (0.051 R)
- M29: 6,478,635 km (0.115 R)
- M30: 6,711,110 km (0.113 R)
- M31: 6,993,850 km (0.027 R)
- M32: 7,304,565 km (0.094 R)
- M33: 7,595,533 km (0.111 R)
- M34: 7,989,424 km (0.106 R)
- M35: 8,188,838 km (0.051 R)
- M36: 8,390,047 km (0.082 R)
- M37: 8,720,359 km (0.08 R)
- M38: 9,950,353 km (0.112 R)
- M39: 10,273,185 km (0.101 R)
- M40: 11,123,050 km (0.094 R)
- M41: 11,598,772 km (0.067 R)
- M42: 11,967,082 km (0.064 R)
- M43: 13,567,629 km (0.101 R)
- M44: 13,865,778 km (0.057 R)
- M45: 14,560,062 km (0.085 R)
- M46: 14,957,394 km (0.109 R)
- M47: 15,856,776 km (0.106 R)
- M48: 16,171,081 km (0.09 R)
- M49: 16,265,776 km (0.07 R)
- M50: 16,455,616 km (0.114 R)
- M51: 17,351,558 km (0.075 R)
- M52: 17,772,975 km (0.044 R)
- M53: 17,968,649 km (0.088 R)
- M54: 18,164,921 km (0.119 R)
- M55: 18,460,826 km (0.069 R)
- M56: 18,659,043 km (0.117 R)
- M57: 19,124,143 km (0.11 R)
- M58: 19,492,154 km (0.077 R)
- M59: 20,031,903 km (0.091 R)
- M60: 20,235,506 km (0.116 R)
- M61: 20,473,965 km (0.075 R)
- M62: 21,367,812 km (0.096 R)
- M63: 21,749,885 km (0.079 R)
- M64: 21,854,454 km (0.1 R)
- M65: 22,239,369 km (0.052 R)
- M66: 22,344,686 km (0.107 R)
- M67: 22,944,873 km (0.108 R)
- M68: 23,193,654 km (0.087 R)
- M69: 23,407,579 km (0.056 R)
- M70: 23,586,348 km (0.12 R)
- M71: 23,909,180 km (0.031 R)
- M72: 24,053,094 km (0.076 R)
Planet 7 - Ice Giant
Semi-Major Axis: 10.83 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 770.1
Radius: 3.4
Gravity: 66.62 G
Time & Orbit
Eccentricity (e): 0.153
Orbit Range: 9.17 AU - 12.49 AU
Year: 22661 Days
Day: 18.1 Hours
Environment
Temp: -226 °C
Axial Tilt: 26.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (98)
Outer Limit: 85,987,690 km
- M1: 200,162 km (0.086 R)
- M2: 511,326 km (0.05 R)
- M3: 808,576 km (0.071 R)
- M4: 2,097,362 km (0.112 R)
- M5: 2,134,612 km (0.114 R)
- M6: 2,966,526 km (0.061 R)
- M7: 3,050,450 km (0.04 R)
- M8: 3,177,758 km (0.106 R)
- M9: 3,394,076 km (0.061 R)
- M10: 3,437,759 km (0.093 R)
- M11: 3,749,820 km (0.069 R)
- M12: 4,211,030 km (0.048 R)
- M13: 5,085,280 km (0.067 R)
- M14: 6,013,386 km (0.096 R)
- M15: 6,660,546 km (0.077 R)
- M16: 6,881,053 km (0.056 R)
- M17: 6,936,554 km (0.048 R)
- M18: 6,992,354 km (0.118 R)
- M19: 7,386,096 km (0.11 R)
- M20: 7,961,299 km (0.092 R)
- M21: 8,491,026 km (0.089 R)
- M22: 8,550,565 km (0.118 R)
- M23: 9,522,353 km (0.068 R)
- M24: 9,770,835 km (0.119 R)
- M25: 10,656,754 km (0.086 R)
- M26: 10,979,437 km (0.106 R)
- M27: 11,568,104 km (0.054 R)
- M28: 12,708,040 km (0.075 R)
- M29: 13,742,958 km (0.079 R)
- M30: 14,023,604 km (0.081 R)
- M31: 14,448,013 km (0.076 R)
- M32: 14,876,461 km (0.089 R)
- M33: 15,020,374 km (0.096 R)
- M34: 16,557,642 km (0.056 R)
- M35: 18,067,683 km (0.066 R)
- M36: 18,144,277 km (0.083 R)
- M37: 19,542,419 km (0.088 R)
- M38: 20,174,769 km (0.075 R)
- M39: 20,813,851 km (0.067 R)
- M40: 21,784,891 km (0.105 R)
- M41: 22,688,013 km (0.084 R)
- M42: 23,019,372 km (0.066 R)
- M43: 24,107,398 km (0.108 R)
- M44: 24,445,638 km (0.117 R)
- M45: 24,615,282 km (0.094 R)
- M46: 24,785,226 km (0.055 R)
- M47: 25,727,543 km (0.09 R)
- M48: 27,118,952 km (0.086 R)
- M49: 27,382,544 km (0.066 R)
- M50: 27,912,270 km (0.09 R)
- M51: 30,885,528 km (0.096 R)
- M52: 31,713,701 km (0.113 R)
- M53: 32,735,754 km (0.116 R)
- M54: 33,297,793 km (0.083 R)
- M55: 35,481,773 km (0.065 R)
- M56: 35,673,856 km (0.07 R)
- M57: 35,770,048 km (0.093 R)
- M58: 36,155,561 km (0.083 R)
- M59: 36,639,510 km (0.111 R)
- M60: 37,028,016 km (0.1 R)
- M61: 37,320,480 km (0.103 R)
- M62: 37,613,542 km (0.039 R)
- M63: 39,289,188 km (0.089 R)
- M64: 39,388,371 km (0.076 R)
- M65: 40,888,240 km (0.047 R)
- M66: 49,409,634 km (0.095 R)
- M67: 49,946,391 km (0.1 R)
- M68: 50,053,952 km (0.093 R)
- M69: 50,593,102 km (0.096 R)
- M70: 50,701,112 km (0.107 R)
- M71: 53,867,949 km (0.085 R)
- M72: 56,761,022 km (0.108 R)
- M73: 58,679,765 km (0.091 R)
- M74: 58,793,310 km (0.078 R)
- M75: 58,906,854 km (0.028 R)
- M76: 60,505,008 km (0.103 R)
- M77: 63,277,506 km (0.102 R)
- M78: 66,682,503 km (0.101 R)
- M79: 67,038,097 km (0.093 R)
- M80: 67,513,220 km (0.084 R)
- M81: 68,586,435 km (0.119 R)
- M82: 69,185,126 km (0.063 R)
- M83: 73,546,053 km (0.094 R)
- M84: 74,158,806 km (0.075 R)
- M85: 74,650,235 km (0.105 R)
- M86: 75,142,562 km (0.073 R)
- M87: 75,389,249 km (0.108 R)
- M88: 77,870,329 km (0.112 R)
- M89: 78,870,241 km (0.103 R)
- M90: 79,623,018 km (0.079 R)
- M91: 79,874,492 km (0.105 R)
- M92: 80,630,410 km (0.089 R)
- M93: 80,756,671 km (0.07 R)
- M94: 82,403,444 km (0.11 R)
- M95: 82,912,226 km (0.096 R)
- M96: 84,445,305 km (0.084 R)
- M97: 85,215,285 km (0.098 R)
- M98: 85,343,940 km (0.076 R)
Kuiper Belt
Range: 30 - 60 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 451 - 14,442 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.