Star System Generated (Seed: 1766163854)
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 (6 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.66 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.4
Radius: 0.69
Gravity: 0.84 G
Time & Orbit
Eccentricity (e): 0.085
Orbit Range: 0.6 AU - 0.72 AU
Year: 341 Days
Day: 14.9 Hours
Environment
Temp: -128 °C
Axial Tilt: 111.4 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Asteroid Belt
Center: 2.79 AU
Composition
Type: Far Outer (Icy/Cometary)
A dense region of planetesimals and debris.
Boundary
Planet 2 - Gas Giant
Semi-Major Axis: 4.92 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 719.6
Radius: 9.1
Gravity: 8.69 G
Time & Orbit
Eccentricity (e): 0.087
Orbit Range: 4.49 AU - 5.35 AU
Year: 6939 Days
Day: 9.4 Hours
Environment
Temp: -222 °C
Axial Tilt: 21.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (71)
Outer Limit: 68,429,926 km
- M1: 140,472 km (0.118 R)
- M2: 212,878 km (0.091 R)
- M3: 311,014 km (0.102 R)
- M4: 476,619 km (0.094 R)
- M5: 617,839 km (0.106 R)
- M6: 701,016 km (0.086 R)
- M7: 1,090,269 km (0.102 R)
- M8: 1,228,049 km (0.075 R)
- M9: 1,502,262 km (0.118 R)
- M10: 2,022,862 km (0.095 R)
- M11: 2,259,227 km (0.082 R)
- M12: 2,948,574 km (0.036 R)
- M13: 3,341,717 km (0.12 R)
- M14: 3,725,286 km (0.118 R)
- M15: 4,478,661 km (0.101 R)
- M16: 5,132,105 km (0.104 R)
- M17: 5,366,524 km (0.059 R)
- M18: 5,425,616 km (0.069 R)
- M19: 5,906,573 km (0.115 R)
- M20: 6,401,143 km (0.083 R)
- M21: 6,621,800 km (0.058 R)
- M22: 6,973,654 km (0.076 R)
- M23: 7,168,132 km (0.109 R)
- M24: 7,795,695 km (0.094 R)
- M25: 8,717,666 km (0.079 R)
- M26: 8,787,379 km (0.101 R)
- M27: 9,103,180 km (0.054 R)
- M28: 9,566,036 km (0.082 R)
- M29: 10,182,678 km (0.105 R)
- M30: 10,403,485 km (0.041 R)
- M31: 10,588,687 km (0.116 R)
- M32: 11,340,416 km (0.1 R)
- M33: 11,492,707 km (0.102 R)
- M34: 11,838,128 km (0.04 R)
- M35: 12,186,991 km (0.075 R)
- M36: 12,617,982 km (0.092 R)
- M37: 14,022,257 km (0.118 R)
- M38: 14,103,938 km (0.107 R)
- M39: 14,473,744 km (0.114 R)
- M40: 16,027,317 km (0.088 R)
- M41: 16,198,457 km (0.099 R)
- M42: 16,542,533 km (0.11 R)
- M43: 17,589,119 km (0.071 R)
- M44: 17,721,513 km (0.085 R)
- M45: 18,972,600 km (0.071 R)
- M46: 19,153,614 km (0.096 R)
- M47: 19,426,181 km (0.077 R)
- M48: 21,464,751 km (0.117 R)
- M49: 22,652,858 km (0.109 R)
- M50: 23,182,434 km (0.105 R)
- M51: 23,279,224 km (0.084 R)
- M52: 24,548,861 km (0.101 R)
- M53: 25,391,097 km (0.056 R)
- M54: 25,740,707 km (0.115 R)
- M55: 25,891,053 km (0.102 R)
- M56: 27,614,869 km (0.089 R)
- M57: 28,542,376 km (0.097 R)
- M58: 28,957,959 km (0.055 R)
- M59: 30,216,526 km (0.117 R)
- M60: 30,375,100 km (0.088 R)
- M61: 31,868,386 km (0.067 R)
- M62: 32,245,522 km (0.107 R)
- M63: 33,604,319 km (0.113 R)
- M64: 33,768,578 km (0.067 R)
- M65: 33,933,135 km (0.119 R)
- M66: 34,318,200 km (0.107 R)
- M67: 34,594,059 km (0.084 R)
- M68: 34,870,815 km (0.09 R)
- M69: 35,092,669 km (0.11 R)
- M70: 35,203,670 km (0.084 R)
- M71: 36,771,456 km (0.088 R)
Planet 3 - Gas Giant
Semi-Major Axis: 5.61 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 372.1
Radius: 8.7
Gravity: 4.92 G
Time & Orbit
Eccentricity (e): 0.187
Orbit Range: 4.56 AU - 6.66 AU
Year: 8448 Days
Day: 11 Hours
Environment
Temp: -218 °C
Axial Tilt: 41.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 68,429,926 km
- M1: 120,576 km (0.043 R)
- M2: 326,572 km (0.06 R)
- M3: 795,412 km (0.096 R)
- M4: 1,080,545 km (0.088 R)
- M5: 1,177,186 km (0.049 R)
- M6: 1,722,619 km (0.109 R)
- M7: 1,894,507 km (0.11 R)
- M8: 2,234,543 km (0.078 R)
- M9: 2,835,927 km (0.074 R)
- M10: 3,108,644 km (0.076 R)
- M11: 3,178,057 km (0.059 R)
- M12: 3,654,826 km (0.1 R)
- M13: 3,876,679 km (0.075 R)
- M14: 4,027,025 km (0.086 R)
- M15: 4,437,522 km (0.099 R)
- M16: 4,595,048 km (0.096 R)
- M17: 4,754,370 km (0.111 R)
- M18: 5,326,133 km (0.117 R)
- M19: 5,862,292 km (0.098 R)
- M20: 6,122,293 km (0.091 R)
- M21: 6,356,563 km (0.084 R)
- M22: 6,743,573 km (0.106 R)
- M23: 6,834,080 km (0.089 R)
- M24: 7,077,176 km (0.116 R)
- M25: 8,270,369 km (0.09 R)
- M26: 8,594,697 km (0.062 R)
- M27: 8,758,357 km (0.111 R)
- M28: 10,243,265 km (0.116 R)
- M29: 10,486,661 km (0.084 R)
- M30: 11,121,255 km (0.065 R)
- M31: 11,443,190 km (0.025 R)
- M32: 12,059,683 km (0.062 R)
- M33: 13,666,962 km (0.034 R)
- M34: 14,398,346 km (0.119 R)
- M35: 14,592,973 km (0.119 R)
- M36: 14,671,063 km (0.099 R)
- M37: 14,749,303 km (0.117 R)
- M38: 16,913,236 km (0.06 R)
- M39: 17,407,507 km (0.059 R)
- M40: 17,990,191 km (0.093 R)
- M41: 18,494,635 km (0.103 R)
- M42: 19,217,342 km (0.1 R)
- M43: 19,949,175 km (0.116 R)
- M44: 20,953,875 km (0.109 R)
- M45: 21,218,663 km (0.054 R)
- M46: 21,573,509 km (0.092 R)
- M47: 21,840,840 km (0.107 R)
- M48: 22,109,369 km (0.105 R)
- M49: 22,514,180 km (0.106 R)
- M50: 22,830,580 km (0.084 R)
- M51: 22,921,386 km (0.083 R)
- M52: 23,194,252 km (0.101 R)
- M53: 24,528,067 km (0.115 R)
- M54: 24,900,416 km (0.095 R)
- M55: 26,646,822 km (0.059 R)
- M56: 26,837,858 km (0.082 R)
- M57: 27,365,938 km (0.069 R)
- M58: 27,703,730 km (0.07 R)
- M59: 28,578,728 km (0.07 R)
- M60: 29,908,205 km (0.092 R)
- M61: 30,106,871 km (0.063 R)
- M62: 30,355,802 km (0.111 R)
- M63: 31,006,253 km (0.049 R)
- M64: 31,914,462 km (0.109 R)
- M65: 32,626,847 km (0.113 R)
- M66: 33,190,382 km (0.101 R)
- M67: 33,447,541 km (0.041 R)
- M68: 34,430,848 km (0.052 R)
Asteroid Belt
Center: 6.68 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 4 - Ice Giant
Semi-Major Axis: 7.75 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 727.6
Radius: 4
Gravity: 45.48 G
Time & Orbit
Eccentricity (e): 0.099
Orbit Range: 6.98 AU - 8.52 AU
Year: 13718 Days
Day: 19.2 Hours
Environment
Temp: -236 °C
Axial Tilt: 33.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 68,429,926 km
- M1: 85,121 km (0.098 R)
- M2: 274,063 km (0.07 R)
- M3: 363,224 km (0.101 R)
- M4: 479,162 km (0.031 R)
- M5: 569,070 km (0.081 R)
- M6: 684,261 km (0.115 R)
- M7: 724,203 km (0.034 R)
- M8: 849,267 km (0.098 R)
- M9: 914,342 km (0.094 R)
- M10: 1,049,579 km (0.119 R)
- M11: 1,119,590 km (0.051 R)
- M12: 1,215,333 km (0.109 R)
- M13: 1,338,751 km (0.082 R)
- M14: 1,389,315 km (0.041 R)
- M15: 1,597,855 km (0.054 R)
- M16: 1,733,241 km (0.044 R)
- M17: 2,464,176 km (0.086 R)
- M18: 3,660,211 km (0.084 R)
- M19: 4,353,298 km (0.069 R)
- M20: 4,695,428 km (0.087 R)
- M21: 5,567,734 km (0.07 R)
- M22: 5,772,832 km (0.1 R)
- M23: 5,938,736 km (0.078 R)
- M24: 5,980,474 km (0.038 R)
- M25: 6,064,099 km (0.039 R)
- M26: 6,190,509 km (0.111 R)
- M27: 6,445,723 km (0.097 R)
- M28: 6,791,444 km (0.03 R)
- M29: 6,922,641 km (0.11 R)
- M30: 7,143,149 km (0.083 R)
- M31: 8,655,284 km (0.088 R)
- M32: 9,180,522 km (0.081 R)
- M33: 9,277,162 km (0.082 R)
- M34: 9,814,668 km (0.083 R)
- M35: 10,766,559 km (0.076 R)
- M36: 10,919,448 km (0.063 R)
- M37: 11,176,008 km (0.119 R)
- M38: 11,904,999 km (0.107 R)
- M39: 12,168,889 km (0.052 R)
- M40: 15,541,723 km (0.109 R)
- M41: 16,120,367 km (0.045 R)
- M42: 16,353,890 km (0.106 R)
- M43: 17,061,039 km (0.029 R)
- M44: 17,657,785 km (0.108 R)
- M45: 17,717,923 km (0.045 R)
- M46: 18,504,808 km (0.113 R)
- M47: 18,749,251 km (0.049 R)
- M48: 18,810,586 km (0.097 R)
- M49: 19,800,026 km (0.112 R)
- M50: 20,050,004 km (0.097 R)
- M51: 20,426,991 km (0.095 R)
- M52: 22,411,556 km (0.12 R)
- M53: 22,541,706 km (0.114 R)
- M54: 22,737,380 km (0.085 R)
- M55: 23,790,549 km (0.085 R)
- M56: 23,989,814 km (0.09 R)
- M57: 24,256,248 km (0.105 R)
- M58: 25,264,238 km (0.095 R)
- M59: 26,767,397 km (0.067 R)
- M60: 28,018,484 km (0.086 R)
- M61: 28,299,130 km (0.056 R)
- M62: 28,792,504 km (0.115 R)
- M63: 29,644,763 km (0.071 R)
- M64: 30,217,573 km (0.091 R)
- M65: 31,884,692 km (0.108 R)
- M66: 33,061,877 km (0.116 R)
- M67: 33,135,779 km (0.083 R)
- M68: 33,581,281 km (0.087 R)
- M69: 35,307,042 km (0.071 R)
- M70: 36,066,401 km (0.102 R)
- M71: 36,295,136 km (0.114 R)
- M72: 36,371,581 km (0.081 R)
- M73: 37,600,976 km (0.071 R)
- M74: 38,610,014 km (0.105 R)
- M75: 38,765,895 km (0.12 R)
- M76: 39,156,943 km (0.108 R)
- M77: 39,627,728 km (0.106 R)
- M78: 40,179,445 km (0.088 R)
- M79: 40,654,418 km (0.106 R)
- M80: 41,769,670 km (0.119 R)
- M81: 43,056,661 km (0.036 R)
- M82: 43,380,391 km (0.118 R)
- M83: 43,867,481 km (0.113 R)
- M84: 44,438,197 km (0.062 R)
- M85: 46,745,146 km (0.119 R)
- M86: 48,669,274 km (0.091 R)
- M87: 49,259,886 km (0.117 R)
- M88: 53,026,760 km (0.107 R)
- M89: 54,594,247 km (0.105 R)
- M90: 54,681,762 km (0.074 R)
- M91: 55,383,675 km (0.101 R)
- M92: 56,973,900 km (0.053 R)
- M93: 57,507,217 km (0.073 R)
- M94: 58,131,638 km (0.057 R)
Planet 5 - Ice Giant
Semi-Major Axis: 8.17 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 345.8
Radius: 3
Gravity: 38.42 G
Time & Orbit
Eccentricity (e): 0.055
Orbit Range: 7.72 AU - 8.62 AU
Year: 14848 Days
Day: 18.2 Hours
Environment
Temp: -222 °C
Axial Tilt: 23.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 68,429,926 km
- M1: 102,624 km (0.081 R)
- M2: 177,722 km (0.079 R)
- M3: 257,458 km (0.091 R)
- M4: 321,486 km (0.066 R)
- M5: 609,013 km (0.095 R)
- M6: 712,834 km (0.097 R)
- M7: 898,186 km (0.118 R)
- M8: 1,139,487 km (0.062 R)
- M9: 1,289,085 km (0.082 R)
- M10: 1,399,937 km (0.103 R)
- M11: 1,678,039 km (0.083 R)
- M12: 1,897,799 km (0.084 R)
- M13: 2,390,724 km (0.071 R)
- M14: 2,637,410 km (0.114 R)
- M15: 3,213,961 km (0.111 R)
- M16: 3,827,910 km (0.101 R)
- M17: 3,859,475 km (0.088 R)
- M18: 3,923,055 km (0.114 R)
- M19: 4,051,110 km (0.074 R)
- M20: 4,083,423 km (0.113 R)
- M21: 4,278,649 km (0.047 R)
- M22: 4,311,411 km (0.077 R)
- M23: 4,410,444 km (0.069 R)
- M24: 4,510,226 km (0.054 R)
- M25: 4,779,951 km (0.063 R)
- M26: 4,882,426 km (0.059 R)
- M27: 4,951,091 km (0.117 R)
- M28: 5,264,349 km (0.051 R)
- M29: 5,583,890 km (0.059 R)
- M30: 6,428,819 km (0.094 R)
- M31: 6,466,518 km (0.115 R)
- M32: 6,541,915 km (0.101 R)
- M33: 6,846,795 km (0.058 R)
- M34: 7,829,055 km (0.04 R)
- M35: 8,234,166 km (0.102 R)
- M36: 8,275,006 km (0.11 R)
- M37: 8,439,265 km (0.053 R)
- M38: 8,938,323 km (0.103 R)
- M39: 9,064,584 km (0.114 R)
- M40: 9,747,797 km (0.117 R)
- M41: 10,536,028 km (0.114 R)
- M42: 10,669,470 km (0.076 R)
- M43: 12,453,275 km (0.096 R)
- M44: 12,783,138 km (0.073 R)
- M45: 15,827,006 km (0.107 R)
- M46: 16,286,720 km (0.057 R)
- M47: 16,802,534 km (0.1 R)
- M48: 17,428,601 km (0.061 R)
- M49: 18,009,190 km (0.065 R)
- M50: 18,918,745 km (0.107 R)
- M51: 19,080,760 km (0.107 R)
- M52: 19,515,192 km (0.052 R)
- M53: 20,172,974 km (0.097 R)
- M54: 20,228,175 km (0.093 R)
- M55: 20,393,930 km (0.114 R)
- M56: 21,173,185 km (0.119 R)
- M57: 21,735,823 km (0.049 R)
- M58: 21,905,616 km (0.113 R)
- M59: 22,075,709 km (0.054 R)
- M60: 22,933,204 km (0.096 R)
- M61: 24,210,471 km (0.107 R)
- M62: 24,857,631 km (0.079 R)
- M63: 25,094,295 km (0.045 R)
- M64: 25,213,076 km (0.111 R)
- M65: 26,409,858 km (0.077 R)
- M66: 27,380,599 km (0.069 R)
- M67: 27,931,718 km (0.078 R)
- M68: 28,734,310 km (0.098 R)
- M69: 29,481,701 km (0.09 R)
- M70: 30,046,583 km (0.061 R)
- M71: 30,614,905 km (0.04 R)
- M72: 32,729,172 km (0.054 R)
- M73: 32,858,873 km (0.093 R)
- M74: 33,118,575 km (0.096 R)
- M75: 33,379,174 km (0.09 R)
- M76: 33,574,998 km (0.094 R)
- M77: 34,164,713 km (0.09 R)
- M78: 34,956,235 km (0.054 R)
- M79: 35,553,879 km (0.088 R)
- M80: 36,961,445 km (0.104 R)
- M81: 37,638,226 km (0.104 R)
- M82: 37,705,994 km (0.077 R)
- M83: 38,797,909 km (0.102 R)
- M84: 39,141,236 km (0.08 R)
- M85: 39,899,996 km (0.11 R)
- M86: 40,385,441 km (0.039 R)
- M87: 42,912,598 km (0.095 R)
- M88: 43,766,353 km (0.099 R)
- M89: 44,553,836 km (0.114 R)
- M90: 46,288,124 km (0.105 R)
- M91: 47,163,421 km (0.12 R)
- M92: 47,823,597 km (0.119 R)
- M93: 48,560,666 km (0.091 R)
- M94: 48,708,468 km (0.034 R)
Planet 6 - Ice Giant
Semi-Major Axis: 11.36 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 336.3
Radius: 5.8
Gravity: 10 G
Time & Orbit
Eccentricity (e): 0.054
Orbit Range: 10.75 AU - 11.97 AU
Year: 24344 Days
Day: 17.2 Hours
Environment
Temp: -222 °C
Axial Tilt: 38.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (94)
Outer Limit: 68,429,926 km
- M1: 83,326 km (0.064 R)
- M2: 280,197 km (0.061 R)
- M3: 358,736 km (0.106 R)
- M4: 427,401 km (0.028 R)
- M5: 558,598 km (0.077 R)
- M6: 768,634 km (0.117 R)
- M7: 929,900 km (0.101 R)
- M8: 1,561,203 km (0.095 R)
- M9: 1,618,948 km (0.067 R)
- M10: 2,364,843 km (0.043 R)
- M11: 2,600,161 km (0.025 R)
- M12: 2,737,940 km (0.119 R)
- M13: 2,842,958 km (0.082 R)
- M14: 3,350,394 km (0.063 R)
- M15: 3,576,436 km (0.088 R)
- M16: 4,365,266 km (0.107 R)
- M17: 4,447,096 km (0.074 R)
- M18: 5,205,707 km (0.113 R)
- M19: 5,778,218 km (0.109 R)
- M20: 6,650,523 km (0.104 R)
- M21: 7,174,115 km (0.119 R)
- M22: 7,514,151 km (0.116 R)
- M23: 8,361,773 km (0.109 R)
- M24: 8,463,500 km (0.049 R)
- M25: 9,082,386 km (0.12 R)
- M26: 10,582,254 km (0.072 R)
- M27: 10,692,358 km (0.117 R)
- M28: 11,529,807 km (0.078 R)
- M29: 12,795,854 km (0.1 R)
- M30: 12,971,931 km (0.079 R)
- M31: 13,148,755 km (0.113 R)
- M32: 13,803,994 km (0.093 R)
- M33: 16,021,633 km (0.108 R)
- M34: 16,211,323 km (0.039 R)
- M35: 16,401,911 km (0.1 R)
- M36: 17,235,919 km (0.097 R)
- M37: 17,886,819 km (0.104 R)
- M38: 17,952,343 km (0.084 R)
- M39: 19,684,088 km (0.102 R)
- M40: 21,398,928 km (0.116 R)
- M41: 22,098,149 km (0.114 R)
- M42: 22,521,211 km (0.091 R)
- M43: 23,089,534 km (0.08 R)
- M44: 24,023,024 km (0.083 R)
- M45: 25,188,990 km (0.073 R)
- M46: 25,262,443 km (0.027 R)
- M47: 25,557,001 km (0.098 R)
- M48: 25,630,902 km (0.085 R)
- M49: 26,597,155 km (0.091 R)
- M50: 26,746,902 km (0.064 R)
- M51: 26,971,898 km (0.068 R)
- M52: 28,872,090 km (0.118 R)
- M53: 29,103,069 km (0.116 R)
- M54: 29,334,497 km (0.059 R)
- M55: 29,644,164 km (0.12 R)
- M56: 30,110,760 km (0.106 R)
- M57: 30,344,881 km (0.08 R)
- M58: 30,658,139 km (0.105 R)
- M59: 30,972,294 km (0.114 R)
- M60: 31,129,821 km (0.1 R)
- M61: 32,000,929 km (0.119 R)
- M62: 32,160,251 km (0.028 R)
- M63: 32,960,300 km (0.087 R)
- M64: 35,153,405 km (0.097 R)
- M65: 36,391,926 km (0.09 R)
- M66: 39,764,012 km (0.088 R)
- M67: 40,106,740 km (0.083 R)
- M68: 40,708,722 km (0.067 R)
- M69: 42,707,799 km (0.097 R)
- M70: 43,498,573 km (0.087 R)
- M71: 44,916,611 km (0.055 R)
- M72: 46,981,211 km (0.091 R)
- M73: 47,434,194 km (0.11 R)
- M74: 48,435,751 km (0.105 R)
- M75: 49,628,346 km (0.069 R)
- M76: 50,645,013 km (0.077 R)
- M77: 51,855,409 km (0.105 R)
- M78: 52,605,044 km (0.084 R)
- M79: 53,263,723 km (0.07 R)
- M80: 53,358,120 km (0.079 R)
- M81: 53,925,395 km (0.113 R)
- M82: 54,399,471 km (0.1 R)
- M83: 54,970,336 km (0.063 R)
- M84: 55,161,073 km (0.11 R)
- M85: 57,370,335 km (0.072 R)
- M86: 61,379,408 km (0.113 R)
- M87: 62,669,390 km (0.053 R)
- M88: 62,968,437 km (0.106 R)
- M89: 64,068,579 km (0.074 R)
- M90: 65,175,155 km (0.118 R)
- M91: 66,288,013 km (0.102 R)
- M92: 66,795,898 km (0.102 R)
- M93: 66,999,501 km (0.055 R)
- M94: 67,407,155 km (0.11 R)
Kuiper Belt
Range: 30 - 54 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 423 - 15,687 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.