Star System Generated (Seed: 1768175210)
Star Details
Spectral Class: M5V
Temperature: 3,050 K
Mass: 0.3 sol
Luminosity: 0.01 lux
Habitable Zone (HZ)
Inner Boundary: 0.1 AU
Outer Boundary: 0.14 AU
Physical Limits
Snow Line: 0.48 AU
Max System Radius: 11 AU
Planetary System (5 Planets)
Asteroid Belt
Center: 1.02 AU
Composition
Type: Far Outer (Icy/Cometary)
A dense region of planetesimals and debris.
Boundary
Planet 1 - Gas Giant
Semi-Major Axis: 2.03 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 751.4
Radius: 9
Gravity: 9.28 G
Time & Orbit
Eccentricity (e): 0.236
Orbit Range: 1.55 AU - 2.51 AU
Year: 1929 Days
Day: 12.3 Hours
Environment
Temp: -197 °C
Axial Tilt: 8.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (70)
Outer Limit: 65,872,370 km
- M1: 121,473 km (0.096 R)
- M2: 233,373 km (0.072 R)
- M3: 300,692 km (0.115 R)
- M4: 389,852 km (0.074 R)
- M5: 518,057 km (0.12 R)
- M6: 607,068 km (0.092 R)
- M7: 853,755 km (0.062 R)
- M8: 1,007,542 km (0.09 R)
- M9: 1,180,626 km (0.104 R)
- M10: 1,416,093 km (0.107 R)
- M11: 1,545,047 km (0.1 R)
- M12: 1,633,310 km (0.08 R)
- M13: 1,931,608 km (0.071 R)
- M14: 1,990,998 km (0.096 R)
- M15: 2,087,339 km (0.06 R)
- M16: 2,185,326 km (0.093 R)
- M17: 2,259,825 km (0.071 R)
- M18: 2,385,936 km (0.111 R)
- M19: 2,632,025 km (0.116 R)
- M20: 2,886,341 km (0.098 R)
- M21: 2,954,558 km (0.059 R)
- M22: 3,261,533 km (0.062 R)
- M23: 3,361,315 km (0.049 R)
- M24: 3,462,144 km (0.07 R)
- M25: 3,711,374 km (0.111 R)
- M26: 4,227,337 km (0.106 R)
- M27: 4,493,770 km (0.119 R)
- M28: 4,685,256 km (0.096 R)
- M29: 4,814,359 km (0.088 R)
- M30: 4,960,965 km (0.105 R)
- M31: 5,026,638 km (0.114 R)
- M32: 5,309,079 km (0.105 R)
- M33: 5,460,771 km (0.107 R)
- M34: 5,579,701 km (0.071 R)
- M35: 6,151,913 km (0.115 R)
- M36: 6,525,758 km (0.117 R)
- M37: 6,688,222 km (0.077 R)
- M38: 6,943,735 km (0.092 R)
- M39: 7,146,739 km (0.09 R)
- M40: 7,314,289 km (0.072 R)
- M41: 8,113,441 km (0.066 R)
- M42: 8,366,411 km (0.112 R)
- M43: 8,760,751 km (0.092 R)
- M44: 9,424,516 km (0.099 R)
- M45: 9,547,037 km (0.066 R)
- M46: 9,731,641 km (0.082 R)
- M47: 9,896,797 km (0.09 R)
- M48: 9,979,824 km (0.066 R)
- M49: 10,062,850 km (0.07 R)
- M50: 10,355,763 km (0.078 R)
- M51: 11,251,256 km (0.101 R)
- M52: 11,468,023 km (0.052 R)
- M53: 11,533,397 km (0.036 R)
- M54: 11,620,613 km (0.078 R)
- M55: 11,839,923 km (0.026 R)
- M56: 11,905,896 km (0.086 R)
- M57: 12,104,712 km (0.12 R)
- M58: 12,327,014 km (0.067 R)
- M59: 12,483,344 km (0.108 R)
- M60: 12,572,953 km (0.116 R)
- M61: 12,979,111 km (0.102 R)
- M62: 13,275,016 km (0.112 R)
- M63: 13,989,794 km (0.117 R)
- M64: 14,059,657 km (0.058 R)
- M65: 14,622,444 km (0.09 R)
- M66: 15,168,775 km (0.117 R)
- M67: 15,264,518 km (0.079 R)
- M68: 15,576,878 km (0.09 R)
- M69: 15,794,394 km (0.086 R)
- M70: 15,964,337 km (0.03 R)
Planet 2 - Ice Giant
Semi-Major Axis: 7.76 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 187
Radius: 6
Gravity: 5.19 G
Time & Orbit
Eccentricity (e): 0.234
Orbit Range: 5.94 AU - 9.58 AU
Year: 14415 Days
Day: 15.2 Hours
Environment
Temp: -235 °C
Axial Tilt: 23.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 65,872,370 km
- M1: 88,562 km (0.112 R)
- M2: 240,703 km (0.091 R)
- M3: 356,492 km (0.087 R)
- M4: 491,130 km (0.076 R)
- M5: 613,650 km (0.062 R)
- M6: 953,986 km (0.088 R)
- M7: 1,327,083 km (0.11 R)
- M8: 1,499,868 km (0.092 R)
- M9: 2,017,327 km (0.061 R)
- M10: 2,329,538 km (0.085 R)
- M11: 2,398,503 km (0.034 R)
- M12: 2,875,121 km (0.116 R)
- M13: 2,974,006 km (0.107 R)
- M14: 3,149,634 km (0.077 R)
- M15: 3,380,613 km (0.092 R)
- M16: 3,750,718 km (0.086 R)
- M17: 3,885,954 km (0.072 R)
- M18: 3,995,310 km (0.038 R)
- M19: 4,133,539 km (0.06 R)
- M20: 4,965,901 km (0.093 R)
- M21: 5,114,602 km (0.101 R)
- M22: 5,204,510 km (0.072 R)
- M23: 5,661,980 km (0.043 R)
- M24: 5,974,041 km (0.092 R)
- M25: 6,037,172 km (0.085 R)
- M26: 6,680,143 km (0.093 R)
- M27: 6,943,585 km (0.072 R)
- M28: 7,143,298 km (0.108 R)
- M29: 7,480,342 km (0.028 R)
- M30: 7,616,626 km (0.094 R)
- M31: 7,719,400 km (0.112 R)
- M32: 8,310,461 km (0.031 R)
- M33: 9,242,306 km (0.085 R)
- M34: 9,351,961 km (0.049 R)
- M35: 9,535,667 km (0.109 R)
- M36: 11,950,476 km (0.098 R)
- M37: 11,990,269 km (0.114 R)
- M38: 12,109,948 km (0.073 R)
- M39: 12,310,110 km (0.066 R)
- M40: 12,592,251 km (0.114 R)
- M41: 12,754,565 km (0.112 R)
- M42: 12,795,255 km (0.076 R)
- M43: 12,835,946 km (0.113 R)
- M44: 12,958,317 km (0.063 R)
- M45: 14,711,903 km (0.077 R)
- M46: 15,269,604 km (0.098 R)
- M47: 15,485,923 km (0.068 R)
- M48: 16,582,774 km (0.069 R)
- M49: 16,760,646 km (0.102 R)
- M50: 16,805,226 km (0.082 R)
- M51: 17,433,089 km (0.084 R)
- M52: 17,977,475 km (0.091 R)
- M53: 18,619,549 km (0.093 R)
- M54: 18,711,851 km (0.101 R)
- M55: 18,896,904 km (0.103 R)
- M56: 19,362,452 km (0.08 R)
- M57: 20,781,538 km (0.034 R)
- M58: 21,648,906 km (0.108 R)
- M59: 22,380,739 km (0.102 R)
- M60: 22,675,746 km (0.059 R)
- M61: 22,823,698 km (0.079 R)
- M62: 23,269,650 km (0.105 R)
- M63: 23,369,132 km (0.092 R)
- M64: 23,969,020 km (0.09 R)
- M65: 24,019,135 km (0.109 R)
- M66: 26,263,103 km (0.109 R)
- M67: 26,834,417 km (0.098 R)
- M68: 27,305,052 km (0.085 R)
- M69: 27,883,846 km (0.084 R)
- M70: 28,786,221 km (0.074 R)
- M71: 28,839,627 km (0.111 R)
- M72: 28,893,034 km (0.088 R)
- M73: 29,321,631 km (0.115 R)
- M74: 29,590,459 km (0.112 R)
- M75: 29,752,174 km (0.113 R)
- M76: 31,826,049 km (0.084 R)
- M77: 32,268,560 km (0.103 R)
- M78: 32,992,015 km (0.111 R)
- M79: 34,966,258 km (0.107 R)
- M80: 35,651,865 km (0.112 R)
- M81: 35,938,794 km (0.094 R)
- M82: 37,268,869 km (0.105 R)
- M83: 37,327,062 km (0.059 R)
- M84: 37,501,793 km (0.026 R)
- M85: 38,262,199 km (0.091 R)
- M86: 38,968,600 km (0.048 R)
Planet 3 - Ice Giant
Semi-Major Axis: 7.81 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 860.1
Radius: 5.3
Gravity: 30.62 G
Time & Orbit
Eccentricity (e): 0.183
Orbit Range: 6.38 AU - 9.24 AU
Year: 14555 Days
Day: 24.2 Hours
Environment
Temp: -232 °C
Axial Tilt: 16 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (93)
Outer Limit: 65,872,370 km
- M1: 410,646 km (0.102 R)
- M2: 500,405 km (0.093 R)
- M3: 1,065,436 km (0.052 R)
- M4: 1,165,367 km (0.117 R)
- M5: 2,039,318 km (0.11 R)
- M6: 2,962,935 km (0.076 R)
- M7: 2,998,091 km (0.092 R)
- M8: 3,958,958 km (0.094 R)
- M9: 3,997,704 km (0.06 R)
- M10: 4,798,651 km (0.112 R)
- M11: 5,302,497 km (0.111 R)
- M12: 5,604,235 km (0.106 R)
- M13: 5,735,134 km (0.111 R)
- M14: 6,179,140 km (0.071 R)
- M15: 7,915,523 km (0.1 R)
- M16: 8,062,577 km (0.06 R)
- M17: 8,359,379 km (0.097 R)
- M18: 8,760,601 km (0.104 R)
- M19: 9,738,522 km (0.088 R)
- M20: 10,213,795 km (0.088 R)
- M21: 10,913,464 km (0.063 R)
- M22: 10,967,917 km (0.109 R)
- M23: 11,241,682 km (0.093 R)
- M24: 11,851,592 km (0.05 R)
- M25: 12,358,729 km (0.118 R)
- M26: 12,415,426 km (0.107 R)
- M27: 13,103,577 km (0.097 R)
- M28: 13,335,753 km (0.1 R)
- M29: 13,862,935 km (0.087 R)
- M30: 14,337,310 km (0.1 R)
- M31: 16,662,211 km (0.076 R)
- M32: 16,725,042 km (0.101 R)
- M33: 17,166,356 km (0.114 R)
- M34: 18,904,683 km (0.091 R)
- M35: 19,364,397 km (0.117 R)
- M36: 19,496,342 km (0.079 R)
- M37: 19,562,465 km (0.047 R)
- M38: 20,428,936 km (0.116 R)
- M39: 24,301,725 km (0.079 R)
- M40: 25,160,417 km (0.078 R)
- M41: 26,393,852 km (0.035 R)
- M42: 27,350,231 km (0.09 R)
- M43: 27,498,333 km (0.111 R)
- M44: 29,070,008 km (0.048 R)
- M45: 31,287,796 km (0.074 R)
- M46: 31,909,076 km (0.11 R)
- M47: 31,987,017 km (0.072 R)
- M48: 32,299,527 km (0.119 R)
- M49: 32,534,545 km (0.116 R)
- M50: 33,242,891 km (0.117 R)
- M51: 34,275,116 km (0.118 R)
- M52: 34,755,026 km (0.065 R)
- M53: 35,559,863 km (0.067 R)
- M54: 36,452,214 km (0.083 R)
- M55: 36,860,317 km (0.08 R)
- M56: 37,681,011 km (0.056 R)
- M57: 37,845,868 km (0.103 R)
- M58: 38,176,329 km (0.03 R)
- M59: 38,507,689 km (0.116 R)
- M60: 38,673,742 km (0.117 R)
- M61: 38,756,769 km (0.07 R)
- M62: 39,089,924 km (0.103 R)
- M63: 39,591,226 km (0.106 R)
- M64: 41,108,148 km (0.03 R)
- M65: 41,192,970 km (0.112 R)
- M66: 41,959,061 km (0.114 R)
- M67: 42,987,696 km (0.079 R)
- M68: 43,851,325 km (0.03 R)
- M69: 44,111,475 km (0.057 R)
- M70: 45,157,464 km (0.091 R)
- M71: 46,123,417 km (0.087 R)
- M72: 46,387,906 km (0.074 R)
- M73: 47,540,408 km (0.114 R)
- M74: 49,061,669 km (0.077 R)
- M75: 50,780,698 km (0.115 R)
- M76: 51,419,032 km (0.104 R)
- M77: 51,784,949 km (0.107 R)
- M78: 53,072,537 km (0.1 R)
- M79: 55,117,091 km (0.11 R)
- M80: 55,585,333 km (0.092 R)
- M81: 56,149,018 km (0.072 R)
- M82: 57,092,681 km (0.12 R)
- M83: 57,281,922 km (0.052 R)
- M84: 57,566,457 km (0.11 R)
- M85: 58,804,380 km (0.061 R)
- M86: 58,995,566 km (0.109 R)
- M87: 60,050,979 km (0.109 R)
- M88: 60,243,511 km (0.074 R)
- M89: 61,209,465 km (0.086 R)
- M90: 62,375,281 km (0.11 R)
- M91: 63,156,631 km (0.104 R)
- M92: 64,137,843 km (0.069 R)
- M93: 65,916,562 km (0.051 R)
Planet 4 - Ice Giant
Semi-Major Axis: 9.96 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 852.8
Radius: 7.9
Gravity: 13.66 G
Time & Orbit
Eccentricity (e): 0.184
Orbit Range: 8.13 AU - 11.79 AU
Year: 20961 Days
Day: 17.8 Hours
Environment
Temp: -243 °C
Axial Tilt: 34.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 65,872,370 km
- M1: 238,010 km (0.104 R)
- M2: 336,894 km (0.031 R)
- M3: 558,748 km (0.117 R)
- M4: 798,553 km (0.041 R)
- M5: 1,069,774 km (0.106 R)
- M6: 1,186,311 km (0.096 R)
- M7: 1,307,186 km (0.093 R)
- M8: 1,796,371 km (0.066 R)
- M9: 1,865,635 km (0.067 R)
- M10: 2,115,463 km (0.107 R)
- M11: 2,413,911 km (0.069 R)
- M12: 2,806,007 km (0.089 R)
- M13: 3,009,460 km (0.046 R)
- M14: 3,133,926 km (0.069 R)
- M15: 3,474,261 km (0.083 R)
- M16: 3,605,009 km (0.106 R)
- M17: 3,871,144 km (0.051 R)
- M18: 3,961,352 km (0.059 R)
- M19: 4,375,887 km (0.025 R)
- M20: 5,048,031 km (0.093 R)
- M21: 5,146,765 km (0.053 R)
- M22: 5,196,282 km (0.065 R)
- M23: 5,700,876 km (0.108 R)
- M24: 5,959,082 km (0.054 R)
- M25: 6,063,351 km (0.074 R)
- M26: 10,016,625 km (0.104 R)
- M27: 10,453,750 km (0.116 R)
- M28: 10,516,730 km (0.034 R)
- M29: 10,897,008 km (0.101 R)
- M30: 11,736,701 km (0.094 R)
- M31: 14,028,989 km (0.108 R)
- M32: 14,588,036 km (0.065 R)
- M33: 15,297,130 km (0.093 R)
- M34: 15,368,638 km (0.096 R)
- M35: 16,308,561 km (0.106 R)
- M36: 16,381,715 km (0.064 R)
- M37: 17,044,284 km (0.093 R)
- M38: 18,395,601 km (0.064 R)
- M39: 20,960,906 km (0.056 R)
- M40: 21,519,355 km (0.113 R)
- M41: 21,760,207 km (0.081 R)
- M42: 22,082,740 km (0.107 R)
- M43: 23,801,769 km (0.111 R)
- M44: 24,134,026 km (0.065 R)
- M45: 24,217,352 km (0.102 R)
- M46: 24,719,253 km (0.081 R)
- M47: 24,971,475 km (0.034 R)
- M48: 25,393,790 km (0.072 R)
- M49: 25,563,284 km (0.117 R)
- M50: 26,159,731 km (0.106 R)
- M51: 27,801,867 km (0.095 R)
- M52: 28,151,776 km (0.058 R)
- M53: 30,102,383 km (0.104 R)
- M54: 31,821,861 km (0.106 R)
- M55: 32,187,927 km (0.088 R)
- M56: 32,555,339 km (0.074 R)
- M57: 33,294,353 km (0.113 R)
- M58: 33,480,003 km (0.117 R)
- M59: 35,829,139 km (0.077 R)
- M60: 36,592,088 km (0.111 R)
- M61: 38,133,993 km (0.107 R)
- M62: 38,425,410 km (0.106 R)
- M63: 38,815,262 km (0.115 R)
- M64: 40,387,386 km (0.081 R)
- M65: 40,882,854 km (0.043 R)
- M66: 41,880,074 km (0.11 R)
- M67: 43,390,713 km (0.109 R)
- M68: 44,000,025 km (0.097 R)
- M69: 44,203,777 km (0.104 R)
- M70: 45,329,800 km (0.099 R)
- M71: 46,776,561 km (0.049 R)
- M72: 47,923,977 km (0.046 R)
- M73: 48,869,585 km (0.087 R)
- M74: 51,314,164 km (0.109 R)
- M75: 52,497,184 km (0.036 R)
- M76: 54,234,165 km (0.05 R)
- M77: 55,659,234 km (0.114 R)
- M78: 56,542,310 km (0.071 R)
- M79: 57,541,325 km (0.092 R)
- M80: 59,106,867 km (0.117 R)
- M81: 60,007,745 km (0.047 R)
- M82: 60,120,691 km (0.098 R)
- M83: 61,026,656 km (0.108 R)
- M84: 62,165,545 km (0.101 R)
- M85: 65,856,573 km (0.072 R)
- M86: 68,081,692 km (0.1 R)
- M87: 68,907,622 km (0.106 R)
- M88: 71,644,664 km (0.113 R)
- M89: 72,845,786 km (0.109 R)
- M90: 75,633,392 km (0.077 R)
- M91: 78,332,437 km (0.155 R)
- M92: 79,817,944 km (0.051 R)
- M93: 80,564,138 km (0.032 R)
- M94: 81,437,640 km (0.076 R)
Planet 5 - Ice Giant
Semi-Major Axis: 9.99 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 401
Radius: 4.6
Gravity: 18.95 G
Time & Orbit
Eccentricity (e): 0.102
Orbit Range: 8.97 AU - 11.01 AU
Year: 21056 Days
Day: 19.3 Hours
Environment
Temp: -235 °C
Axial Tilt: 5.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 65,872,370 km
- M1: 301,889 km (0.104 R)
- M2: 749,336 km (0.116 R)
- M3: 860,188 km (0.098 R)
- M4: 1,355,357 km (0.103 R)
- M5: 1,717,084 km (0.059 R)
- M6: 1,804,749 km (0.055 R)
- M7: 1,984,266 km (0.117 R)
- M8: 3,213,512 km (0.069 R)
- M9: 3,249,565 km (0.095 R)
- M10: 4,308,867 km (0.094 R)
- M11: 5,251,783 km (0.086 R)
- M12: 5,988,104 km (0.1 R)
- M13: 6,300,614 km (0.082 R)
- M14: 6,345,642 km (0.073 R)
- M15: 6,802,365 km (0.102 R)
- M16: 6,941,491 km (0.108 R)
- M17: 7,795,395 km (0.118 R)
- M18: 8,383,016 km (0.081 R)
- M19: 8,432,682 km (0.084 R)
- M20: 9,600,294 km (0.117 R)
- M21: 9,860,744 km (0.118 R)
- M22: 10,018,270 km (0.086 R)
- M23: 10,656,156 km (0.086 R)
- M24: 10,871,726 km (0.078 R)
- M25: 11,361,958 km (0.117 R)
- M26: 11,803,870 km (0.108 R)
- M27: 12,026,921 km (0.11 R)
- M28: 12,364,114 km (0.045 R)
- M29: 14,332,523 km (0.062 R)
- M30: 14,391,914 km (0.115 R)
- M31: 14,570,533 km (0.107 R)
- M32: 14,809,740 km (0.117 R)
- M33: 15,779,583 km (0.05 R)
- M34: 17,971,491 km (0.061 R)
- M35: 18,163,725 km (0.089 R)
- M36: 18,679,837 km (0.117 R)
- M37: 18,744,763 km (0.087 R)
- M38: 19,726,424 km (0.093 R)
- M39: 19,924,791 km (0.112 R)
- M40: 20,323,469 km (0.113 R)
- M41: 20,926,349 km (0.106 R)
- M42: 21,467,294 km (0.104 R)
- M43: 22,218,425 km (0.059 R)
- M44: 22,908,820 km (0.11 R)
- M45: 23,256,635 km (0.089 R)
- M46: 23,466,072 km (0.103 R)
- M47: 23,957,501 km (0.111 R)
- M48: 25,667,703 km (0.107 R)
- M49: 26,975,787 km (0.119 R)
- M50: 27,416,802 km (0.107 R)
- M51: 27,786,009 km (0.117 R)
- M52: 28,231,213 km (0.113 R)
- M53: 30,492,534 km (0.069 R)
- M54: 30,568,829 km (0.105 R)
- M55: 31,182,180 km (0.096 R)
- M56: 31,413,159 km (0.116 R)
- M57: 31,954,554 km (0.099 R)
- M58: 32,889,541 km (0.073 R)
- M59: 35,106,132 km (0.118 R)
- M60: 35,186,167 km (0.111 R)
- M61: 36,313,238 km (0.1 R)
- M62: 36,881,111 km (0.038 R)
- M63: 37,125,554 km (0.043 R)
- M64: 37,697,616 km (0.093 R)
- M65: 39,182,226 km (0.108 R)
- M66: 39,265,252 km (0.098 R)
- M67: 39,764,760 km (0.104 R)
- M68: 40,350,136 km (0.09 R)
- M69: 40,517,835 km (0.092 R)
- M70: 41,022,579 km (0.111 R)
- M71: 42,208,291 km (0.03 R)
- M72: 43,921,636 km (0.059 R)
- M73: 45,221,492 km (0.119 R)
- M74: 46,797,954 km (0.047 R)
- M75: 48,303,208 km (0.056 R)
- M76: 48,838,319 km (0.117 R)
- M77: 49,554,743 km (0.05 R)
- M78: 50,364,966 km (0.104 R)
- M79: 50,636,037 km (0.085 R)
- M80: 50,726,544 km (0.046 R)
- M81: 52,272,488 km (0.069 R)
- M82: 52,638,404 km (0.108 R)
- M83: 53,005,218 km (0.109 R)
- M84: 53,097,071 km (0.08 R)
- M85: 56,157,545 km (0.058 R)
- M86: 56,344,841 km (0.08 R)
- M87: 57,002,025 km (0.119 R)
- M88: 57,567,505 km (0.052 R)
- M89: 59,179,422 km (0.032 R)
- M90: 59,465,453 km (0.096 R)
- M91: 63,810,074 km (0.113 R)
- M92: 65,084,199 km (0.107 R)
Kuiper Belt
Range: 30 - 56 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 187 - 19,894 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.