Star System Generated (Seed: 1765991196)
Star Details
Spectral Class: M1V
Temperature: 3,483 K
Mass: 0.32 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: 11.3 AU
Planetary System (6 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.72 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 849.4
Radius: 11.8
Gravity: 6.1 G
Time & Orbit
Eccentricity (e): 0.19
Orbit Range: 0.58 AU - 0.86 AU
Year: 394 Days
Day: 13.5 Hours
Environment
Temp: -138 °C
Axial Tilt: 10.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (44)
Outer Limit: 58,746,057 km
- M1: 150,944 km (0.097 R)
- M2: 249,978 km (0.112 R)
- M3: 330,761 km (0.111 R)
- M4: 407,056 km (0.111 R)
- M5: 519,254 km (0.098 R)
- M6: 594,951 km (0.114 R)
- M7: 675,135 km (0.112 R)
- M8: 831,166 km (0.086 R)
- M9: 927,357 km (0.072 R)
- M10: 1,032,375 km (0.106 R)
- M11: 1,127,220 km (0.041 R)
- M12: 1,205,310 km (0.05 R)
- M13: 1,285,495 km (0.073 R)
- M14: 1,430,305 km (0.108 R)
- M15: 1,510,191 km (0.118 R)
- M16: 1,608,177 km (0.078 R)
- M17: 1,697,188 km (0.108 R)
- M18: 1,799,513 km (0.111 R)
- M19: 1,915,601 km (0.078 R)
- M20: 2,052,184 km (0.086 R)
- M21: 2,143,289 km (0.117 R)
- M22: 2,223,174 km (0.067 R)
- M23: 2,348,238 km (0.113 R)
- M24: 2,437,249 km (0.098 R)
- M25: 2,751,105 km (0.08 R)
- M26: 2,824,857 km (0.065 R)
- M27: 2,906,238 km (0.113 R)
- M28: 3,050,450 km (0.066 R)
- M29: 3,133,926 km (0.037 R)
- M30: 3,526,471 km (0.067 R)
- M31: 3,724,987 km (0.071 R)
- M32: 3,851,996 km (0.096 R)
- M33: 3,965,241 km (0.094 R)
- M34: 4,102,572 km (0.114 R)
- M35: 4,476,716 km (0.079 R)
- M36: 4,651,895 km (0.094 R)
- M37: 4,748,386 km (0.028 R)
- M38: 4,927,155 km (0.094 R)
- M39: 5,099,941 km (0.102 R)
- M40: 5,333,463 km (0.108 R)
- M41: 5,519,264 km (0.118 R)
- M42: 5,621,589 km (0.12 R)
- M43: 5,793,626 km (0.107 R)
- M44: 5,897,597 km (0.069 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.08 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 574.1
Radius: 10.1
Gravity: 5.63 G
Time & Orbit
Eccentricity (e): 0.211
Orbit Range: 0.85 AU - 1.31 AU
Year: 725 Days
Day: 7.1 Hours
Environment
Temp: -173 °C
Axial Tilt: 5.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (53)
Outer Limit: 58,746,057 km
- M1: 127,607 km (0.094 R)
- M2: 225,294 km (0.114 R)
- M3: 290,818 km (0.097 R)
- M4: 396,135 km (0.11 R)
- M5: 513,270 km (0.092 R)
- M6: 750,682 km (0.094 R)
- M7: 945,159 km (0.114 R)
- M8: 1,017,415 km (0.079 R)
- M9: 1,080,246 km (0.071 R)
- M10: 1,162,226 km (0.03 R)
- M11: 1,276,967 km (0.111 R)
- M12: 1,370,466 km (0.116 R)
- M13: 1,453,343 km (0.044 R)
- M14: 1,685,220 km (0.079 R)
- M15: 1,957,787 km (0.075 R)
- M16: 2,030,043 km (0.116 R)
- M17: 2,147,477 km (0.054 R)
- M18: 2,290,044 km (0.053 R)
- M19: 2,451,161 km (0.114 R)
- M20: 2,616,317 km (0.092 R)
- M21: 2,704,131 km (0.084 R)
- M22: 2,793,142 km (0.082 R)
- M23: 2,874,972 km (0.096 R)
- M24: 2,998,989 km (0.098 R)
- M25: 3,158,909 km (0.104 R)
- M26: 3,235,652 km (0.093 R)
- M27: 3,373,582 km (0.095 R)
- M28: 3,469,623 km (0.1 R)
- M29: 3,566,413 km (0.076 R)
- M30: 3,835,390 km (0.117 R)
- M31: 4,027,773 km (0.113 R)
- M32: 4,101,824 km (0.106 R)
- M33: 4,298,545 km (0.031 R)
- M34: 4,507,833 km (0.101 R)
- M35: 4,633,196 km (0.086 R)
- M36: 4,779,353 km (0.08 R)
- M37: 5,146,167 km (0.108 R)
- M38: 5,348,423 km (0.086 R)
- M39: 5,419,781 km (0.079 R)
- M40: 5,553,223 km (0.117 R)
- M41: 5,687,711 km (0.059 R)
- M42: 6,065,894 km (0.113 R)
- M43: 6,193,801 km (0.067 R)
- M44: 6,398,151 km (0.068 R)
- M45: 6,714,401 km (0.055 R)
- M46: 6,780,523 km (0.071 R)
- M47: 6,924,437 km (0.103 R)
- M48: 7,147,786 km (0.03 R)
- M49: 7,249,064 km (0.075 R)
- M50: 7,350,791 km (0.105 R)
- M51: 7,464,485 km (0.081 R)
- M52: 7,613,185 km (0.1 R)
- M53: 7,693,669 km (0.114 R)
Planet 3 - Gas Giant
Semi-Major Axis: 3.52 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 215.1
Radius: 10.9
Gravity: 1.81 G
Time & Orbit
Eccentricity (e): 0.075
Orbit Range: 3.26 AU - 3.78 AU
Year: 4264 Days
Day: 14.5 Hours
Environment
Temp: -200 °C
Axial Tilt: 9.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 58,746,057 km
- M1: 140,173 km (0.105 R)
- M2: 230,830 km (0.102 R)
- M3: 322,234 km (0.054 R)
- M4: 398,080 km (0.083 R)
- M5: 519,404 km (0.102 R)
- M6: 605,722 km (0.087 R)
- M7: 732,431 km (0.088 R)
- M8: 878,289 km (0.117 R)
- M9: 1,085,033 km (0.108 R)
- M10: 1,297,163 km (0.078 R)
- M11: 1,442,572 km (0.112 R)
- M12: 1,534,725 km (0.06 R)
- M13: 1,761,964 km (0.069 R)
- M14: 1,974,841 km (0.113 R)
- M15: 2,276,281 km (0.11 R)
- M16: 2,370,977 km (0.112 R)
- M17: 2,564,556 km (0.119 R)
- M18: 2,720,288 km (0.103 R)
- M19: 2,821,117 km (0.112 R)
- M20: 2,952,613 km (0.097 R)
- M21: 3,267,367 km (0.092 R)
- M22: 3,593,042 km (0.09 R)
- M23: 4,092,998 km (0.107 R)
- M24: 4,292,561 km (0.117 R)
- M25: 4,410,444 km (0.12 R)
- M26: 4,597,891 km (0.12 R)
- M27: 4,927,903 km (0.061 R)
- M28: 5,051,471 km (0.106 R)
- M29: 5,446,559 km (0.118 R)
- M30: 5,647,918 km (0.084 R)
- M31: 6,001,418 km (0.081 R)
- M32: 6,555,079 km (0.112 R)
- M33: 6,867,589 km (0.082 R)
- M34: 7,125,047 km (0.029 R)
- M35: 7,224,979 km (0.052 R)
- M36: 7,486,925 km (0.042 R)
- M37: 8,061,680 km (0.107 R)
- M38: 8,375,536 km (0.106 R)
- M39: 8,502,245 km (0.035 R)
- M40: 8,586,918 km (0.027 R)
- M41: 8,843,029 km (0.114 R)
- M42: 9,015,216 km (0.025 R)
- M43: 9,188,451 km (0.116 R)
- M44: 9,781,457 km (0.108 R)
- M45: 9,937,188 km (0.047 R)
- M46: 10,183,576 km (0.107 R)
- M47: 11,004,270 km (0.09 R)
- M48: 11,096,721 km (0.056 R)
- M49: 11,329,047 km (0.103 R)
- M50: 11,516,194 km (0.076 R)
- M51: 11,940,902 km (0.103 R)
- M52: 12,012,111 km (0.117 R)
- M53: 12,635,934 km (0.067 R)
- M54: 12,878,581 km (0.115 R)
- M55: 14,065,042 km (0.086 R)
- M56: 14,341,948 km (0.088 R)
- M57: 14,722,226 km (0.077 R)
- M58: 14,849,833 km (0.036 R)
- M59: 14,952,158 km (0.102 R)
- M60: 15,080,363 km (0.06 R)
- M61: 15,544,864 km (0.114 R)
- M62: 15,752,955 km (0.106 R)
- M63: 16,014,153 km (0.094 R)
- M64: 16,250,667 km (0.086 R)
- M65: 16,382,463 km (0.118 R)
- M66: 16,514,707 km (0.036 R)
- M67: 16,806,722 km (0.065 R)
- M68: 17,342,133 km (0.102 R)
- M69: 17,449,993 km (0.109 R)
- M70: 17,693,239 km (0.045 R)
- M71: 18,101,193 km (0.078 R)
- M72: 18,374,957 km (0.056 R)
- M73: 18,457,385 km (0.068 R)
Planet 4 - Gas Giant
Semi-Major Axis: 5.36 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 505.7
Radius: 10.2
Gravity: 4.86 G
Time & Orbit
Eccentricity (e): 0.193
Orbit Range: 4.33 AU - 6.39 AU
Year: 8012 Days
Day: 8.5 Hours
Environment
Temp: -213 °C
Axial Tilt: 43.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (81)
Outer Limit: 58,746,057 km
- M1: 164,109 km (0.107 R)
- M2: 310,715 km (0.046 R)
- M3: 458,966 km (0.104 R)
- M4: 555,756 km (0.092 R)
- M5: 715,826 km (0.076 R)
- M6: 831,465 km (0.084 R)
- M7: 1,066,184 km (0.042 R)
- M8: 1,358,049 km (0.099 R)
- M9: 1,430,455 km (0.103 R)
- M10: 1,655,749 km (0.078 R)
- M11: 1,974,243 km (0.106 R)
- M12: 2,876,917 km (0.066 R)
- M13: 3,090,542 km (0.085 R)
- M14: 3,383,455 km (0.074 R)
- M15: 3,685,493 km (0.085 R)
- M16: 4,235,116 km (0.111 R)
- M17: 6,216,240 km (0.093 R)
- M18: 6,555,379 km (0.066 R)
- M19: 6,742,825 km (0.096 R)
- M20: 6,963,930 km (0.09 R)
- M21: 7,251,607 km (0.082 R)
- M22: 7,445,636 km (0.03 R)
- M23: 7,641,459 km (0.048 R)
- M24: 7,706,983 km (0.108 R)
- M25: 7,905,051 km (0.055 R)
- M26: 8,851,407 km (0.091 R)
- M27: 10,012,137 km (0.037 R)
- M28: 10,192,253 km (0.056 R)
- M29: 10,519,124 km (0.117 R)
- M30: 10,812,485 km (0.038 R)
- M31: 11,034,339 km (0.088 R)
- M32: 11,108,539 km (0.053 R)
- M33: 11,482,534 km (0.112 R)
- M34: 13,373,900 km (0.11 R)
- M35: 14,254,284 km (0.118 R)
- M36: 14,416,298 km (0.119 R)
- M37: 14,906,231 km (0.057 R)
- M38: 15,153,217 km (0.093 R)
- M39: 16,112,588 km (0.06 R)
- M40: 16,493,464 km (0.08 R)
- M41: 16,877,183 km (0.037 R)
- M42: 17,220,809 km (0.1 R)
- M43: 17,871,261 km (0.063 R)
- M44: 18,618,203 km (0.099 R)
- M45: 19,915,815 km (0.107 R)
- M46: 20,142,456 km (0.101 R)
- M47: 20,461,249 km (0.03 R)
- M48: 20,552,653 km (0.1 R)
- M49: 20,644,057 km (0.12 R)
- M50: 21,149,997 km (0.115 R)
- M51: 21,427,651 km (0.091 R)
- M52: 21,520,402 km (0.076 R)
- M53: 21,706,501 km (0.1 R)
- M54: 21,939,725 km (0.119 R)
- M55: 22,220,819 km (0.061 R)
- M56: 22,786,448 km (0.099 R)
- M57: 22,976,139 km (0.041 R)
- M58: 23,309,143 km (0.11 R)
- M59: 23,404,587 km (0.098 R)
- M60: 23,691,815 km (0.101 R)
- M61: 24,901,014 km (0.097 R)
- M62: 25,439,417 km (0.067 R)
- M63: 26,229,294 km (0.065 R)
- M64: 26,378,293 km (0.117 R)
- M65: 26,627,374 km (0.091 R)
- M66: 27,077,514 km (0.095 R)
- M67: 27,177,894 km (0.05 R)
- M68: 27,278,274 km (0.114 R)
- M69: 27,681,590 km (0.062 R)
- M70: 29,211,228 km (0.099 R)
- M71: 30,925,321 km (0.106 R)
- M72: 32,885,801 km (0.076 R)
- M73: 33,046,469 km (0.114 R)
- M74: 33,422,558 km (0.088 R)
- M75: 33,962,157 km (0.112 R)
- M76: 34,178,775 km (0.094 R)
- M77: 34,287,383 km (0.114 R)
- M78: 34,995,430 km (0.053 R)
- M79: 35,653,212 km (0.093 R)
- M80: 35,818,368 km (0.116 R)
- M81: 36,038,875 km (0.045 R)
Planet 5 - Gas Giant
Semi-Major Axis: 5.78 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 618.1
Radius: 12.9
Gravity: 3.71 G
Time & Orbit
Eccentricity (e): 0.162
Orbit Range: 4.84 AU - 6.72 AU
Year: 8972 Days
Day: 7.5 Hours
Environment
Temp: -223 °C
Axial Tilt: 34.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (83)
Outer Limit: 58,746,057 km
- M1: 203,304 km (0.081 R)
- M2: 310,116 km (0.109 R)
- M3: 699,071 km (0.042 R)
- M4: 1,281,007 km (0.112 R)
- M5: 1,397,543 km (0.106 R)
- M6: 1,579,454 km (0.07 R)
- M7: 1,662,930 km (0.084 R)
- M8: 2,012,241 km (0.09 R)
- M9: 2,126,235 km (0.11 R)
- M10: 2,729,563 km (0.071 R)
- M11: 2,985,525 km (0.086 R)
- M12: 3,090,094 km (0.089 R)
- M13: 4,000,097 km (0.103 R)
- M14: 4,115,737 km (0.065 R)
- M15: 4,262,043 km (0.068 R)
- M16: 4,499,904 km (0.061 R)
- M17: 4,681,067 km (0.111 R)
- M18: 4,772,621 km (0.112 R)
- M19: 4,895,590 km (0.102 R)
- M20: 5,207,651 km (0.109 R)
- M21: 5,430,104 km (0.115 R)
- M22: 5,558,608 km (0.099 R)
- M23: 5,884,432 km (0.099 R)
- M24: 6,049,738 km (0.067 R)
- M25: 6,283,709 km (0.092 R)
- M26: 6,452,755 km (0.062 R)
- M27: 6,623,296 km (0.079 R)
- M28: 6,864,448 km (0.05 R)
- M29: 7,108,741 km (0.074 R)
- M30: 7,355,727 km (0.055 R)
- M31: 7,677,662 km (0.057 R)
- M32: 7,931,230 km (0.062 R)
- M33: 8,821,637 km (0.069 R)
- M34: 9,471,490 km (0.093 R)
- M35: 9,782,803 km (0.095 R)
- M36: 10,176,545 km (0.064 R)
- M37: 10,736,639 km (0.117 R)
- M38: 11,061,267 km (0.04 R)
- M39: 11,306,757 km (0.117 R)
- M40: 11,389,035 km (0.105 R)
- M41: 11,595,630 km (0.11 R)
- M42: 13,205,602 km (0.076 R)
- M43: 15,749,365 km (0.083 R)
- M44: 16,396,974 km (0.103 R)
- M45: 16,677,171 km (0.082 R)
- M46: 17,195,078 km (0.081 R)
- M47: 19,122,348 km (0.043 R)
- M48: 19,516,089 km (0.114 R)
- M49: 19,614,824 km (0.106 R)
- M50: 19,763,375 km (0.117 R)
- M51: 19,912,374 km (0.113 R)
- M52: 21,016,107 km (0.046 R)
- M53: 21,320,539 km (0.029 R)
- M54: 22,552,926 km (0.087 R)
- M55: 23,335,024 km (0.119 R)
- M56: 23,545,059 km (0.076 R)
- M57: 25,247,932 km (0.081 R)
- M58: 25,788,130 km (0.052 R)
- M59: 26,114,104 km (0.096 R)
- M60: 26,441,573 km (0.089 R)
- M61: 26,935,097 km (0.039 R)
- M62: 28,771,111 km (0.118 R)
- M63: 29,222,149 km (0.068 R)
- M64: 29,505,338 km (0.109 R)
- M65: 31,165,575 km (0.09 R)
- M66: 31,687,073 km (0.116 R)
- M67: 32,036,234 km (0.081 R)
- M68: 32,152,921 km (0.094 R)
- M69: 32,738,596 km (0.069 R)
- M70: 33,091,647 km (0.042 R)
- M71: 34,158,280 km (0.108 R)
- M72: 34,516,418 km (0.116 R)
- M73: 35,537,722 km (0.064 R)
- M74: 36,143,145 km (0.113 R)
- M75: 36,325,355 km (0.084 R)
- M76: 37,302,827 km (0.096 R)
- M77: 38,847,276 km (0.094 R)
- M78: 39,783,908 km (0.1 R)
- M79: 41,107,849 km (0.046 R)
- M80: 41,679,612 km (0.098 R)
- M81: 41,807,070 km (0.047 R)
- M82: 42,382,124 km (0.11 R)
- M83: 42,702,712 km (0.084 R)
Planet 6 - Ice Giant
Semi-Major Axis: 7.8 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 637.4
Radius: 4.4
Gravity: 32.92 G
Time & Orbit
Eccentricity (e): 0.194
Orbit Range: 6.29 AU - 9.31 AU
Year: 14066 Days
Day: 19.7 Hours
Environment
Temp: -219 °C
Axial Tilt: 36.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 58,746,057 km
- M1: 64,327 km (0.086 R)
- M2: 96,790 km (0.042 R)
- M3: 131,945 km (0.108 R)
- M4: 315,053 km (0.079 R)
- M5: 1,049,878 km (0.091 R)
- M6: 1,095,505 km (0.1 R)
- M7: 1,855,313 km (0.111 R)
- M8: 2,464,027 km (0.096 R)
- M9: 2,617,514 km (0.102 R)
- M10: 2,773,993 km (0.057 R)
- M11: 3,601,718 km (0.064 R)
- M12: 3,670,982 km (0.053 R)
- M13: 3,775,850 km (0.045 R)
- M14: 3,952,675 km (0.067 R)
- M15: 4,241,399 km (0.12 R)
- M16: 5,264,947 km (0.118 R)
- M17: 5,743,212 km (0.085 R)
- M18: 7,215,704 km (0.116 R)
- M19: 8,472,475 km (0.111 R)
- M20: 9,892,159 km (0.098 R)
- M21: 9,940,779 km (0.117 R)
- M22: 10,038,167 km (0.116 R)
- M23: 10,135,854 km (0.086 R)
- M24: 10,480,378 km (0.086 R)
- M25: 10,579,561 km (0.061 R)
- M26: 11,029,552 km (0.064 R)
- M27: 12,311,755 km (0.095 R)
- M28: 12,416,474 km (0.11 R)
- M29: 13,532,623 km (0.107 R)
- M30: 14,129,968 km (0.112 R)
- M31: 14,569,785 km (0.106 R)
- M32: 15,406,486 km (0.107 R)
- M33: 15,519,283 km (0.108 R)
- M34: 15,632,229 km (0.063 R)
- M35: 15,859,169 km (0.058 R)
- M36: 16,835,296 km (0.105 R)
- M37: 17,009,727 km (0.065 R)
- M38: 17,949,351 km (0.091 R)
- M39: 18,067,982 km (0.115 R)
- M40: 18,785,154 km (0.097 R)
- M41: 20,185,839 km (0.075 R)
- M42: 22,828,785 km (0.088 R)
- M43: 23,150,719 km (0.04 R)
- M44: 23,279,822 km (0.082 R)
- M45: 24,914,179 km (0.101 R)
- M46: 25,046,573 km (0.086 R)
- M47: 25,578,244 km (0.055 R)
- M48: 26,113,804 km (0.114 R)
- M49: 26,517,719 km (0.081 R)
- M50: 27,263,763 km (0.089 R)
- M51: 27,742,177 km (0.031 R)
- M52: 29,124,013 km (0.072 R)
- M53: 29,263,438 km (0.113 R)
- M54: 29,753,221 km (0.084 R)
- M55: 29,823,383 km (0.118 R)
- M56: 29,964,005 km (0.105 R)
- M57: 30,528,288 km (0.098 R)
- M58: 33,986,991 km (0.09 R)
- M59: 34,575,359 km (0.109 R)
- M60: 35,315,719 km (0.097 R)
- M61: 38,099,586 km (0.092 R)
- M62: 38,940,775 km (0.1 R)
- M63: 39,325,241 km (0.107 R)
- M64: 40,485,821 km (0.046 R)
- M65: 40,563,612 km (0.068 R)
- M66: 41,109,495 km (0.07 R)
- M67: 41,265,825 km (0.1 R)
- M68: 41,344,064 km (0.116 R)
- M69: 44,595,574 km (0.077 R)
- M70: 45,320,226 km (0.093 R)
- M71: 45,967,686 km (0.103 R)
- M72: 46,292,612 km (0.101 R)
- M73: 46,944,560 km (0.05 R)
- M74: 49,416,515 km (0.116 R)
- M75: 49,499,542 km (0.06 R)
- M76: 49,999,348 km (0.075 R)
- M77: 50,500,651 km (0.097 R)
- M78: 50,751,975 km (0.092 R)
- M79: 51,508,492 km (0.096 R)
- M80: 52,014,880 km (0.063 R)
- M81: 52,777,530 km (0.065 R)
- M82: 52,947,474 km (0.101 R)
- M83: 53,287,958 km (0.088 R)
- M84: 53,543,920 km (0.078 R)
- M85: 53,629,191 km (0.118 R)
- M86: 53,885,602 km (0.112 R)
- M87: 55,346,275 km (0.09 R)
- M88: 55,951,548 km (0.102 R)
- M89: 56,471,999 km (0.086 R)
- M90: 57,430,473 km (0.059 R)
- M91: 58,218,555 km (0.084 R)
- M92: 58,394,332 km (0.118 R)
Kuiper Belt
Range: 30 - 53 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 371 - 17,718 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.