Star System Generated (Seed: 1766681430)
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 (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 1.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 40.7
Radius: 12.3
Gravity: 0.27 G
Time & Orbit
Eccentricity (e): 0.011
Orbit Range: 1 AU - 1.02 AU
Year: 655 Days
Day: 11.7 Hours
Environment
Temp: -167 °C
Axial Tilt: 16.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (27)
Outer Limit: 33,039,053 km
- M1: 156,779 km (0.11 R)
- M2: 238,908 km (0.082 R)
- M3: 319,092 km (0.045 R)
- M4: 471,532 km (0.103 R)
- M5: 553,512 km (0.111 R)
- M6: 733,030 km (0.087 R)
- M7: 858,991 km (0.038 R)
- M8: 941,719 km (0.064 R)
- M9: 1,080,396 km (0.102 R)
- M10: 1,198,429 km (0.099 R)
- M11: 1,279,660 km (0.1 R)
- M12: 1,379,292 km (0.042 R)
- M13: 1,491,640 km (0.056 R)
- M14: 1,586,485 km (0.073 R)
- M15: 1,694,196 km (0.066 R)
- M16: 1,822,401 km (0.104 R)
- M17: 1,953,898 km (0.048 R)
- M18: 2,043,507 km (0.119 R)
- M19: 2,130,573 km (0.063 R)
- M20: 2,211,356 km (0.11 R)
- M21: 2,300,965 km (0.045 R)
- M22: 2,391,771 km (0.092 R)
- M23: 2,471,955 km (0.066 R)
- M24: 2,569,194 km (0.051 R)
- M25: 2,725,972 km (0.055 R)
- M26: 2,894,420 km (0.028 R)
- M27: 2,971,463 km (0.102 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.21 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 159.7
Radius: 10.1
Gravity: 1.57 G
Time & Orbit
Eccentricity (e): 0.175
Orbit Range: 1 AU - 1.42 AU
Year: 859 Days
Day: 8 Hours
Environment
Temp: -165 °C
Axial Tilt: 24.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (39)
Outer Limit: 33,039,053 km
- M1: 127,607 km (0.098 R)
- M2: 223,050 km (0.11 R)
- M3: 512,522 km (0.074 R)
- M4: 613,202 km (0.083 R)
- M5: 681,867 km (0.038 R)
- M6: 802,892 km (0.105 R)
- M7: 985,102 km (0.057 R)
- M8: 1,048,980 km (0.085 R)
- M9: 1,284,148 km (0.115 R)
- M10: 1,447,210 km (0.036 R)
- M11: 1,526,048 km (0.109 R)
- M12: 1,649,765 km (0.03 R)
- M13: 1,805,048 km (0.062 R)
- M14: 1,919,041 km (0.066 R)
- M15: 2,006,107 km (0.11 R)
- M16: 2,118,306 km (0.04 R)
- M17: 2,184,428 km (0.093 R)
- M18: 2,275,533 km (0.078 R)
- M19: 2,386,535 km (0.043 R)
- M20: 2,461,633 km (0.098 R)
- M21: 2,659,401 km (0.09 R)
- M22: 2,763,521 km (0.048 R)
- M23: 2,895,616 km (0.081 R)
- M24: 3,077,228 km (0.116 R)
- M25: 3,235,054 km (0.099 R)
- M26: 3,339,473 km (0.115 R)
- M27: 3,587,507 km (0.041 R)
- M28: 3,659,463 km (0.057 R)
- M29: 3,761,040 km (0.103 R)
- M30: 3,944,746 km (0.025 R)
- M31: 4,063,976 km (0.075 R)
- M32: 4,267,878 km (0.096 R)
- M33: 4,701,562 km (0.095 R)
- M34: 4,851,908 km (0.108 R)
- M35: 5,230,690 km (0.046 R)
- M36: 5,328,975 km (0.075 R)
- M37: 5,436,087 km (0.115 R)
- M38: 5,569,080 km (0.036 R)
- M39: 5,677,838 km (0.098 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.6 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 248.3
Radius: 14.3
Gravity: 1.21 G
Time & Orbit
Eccentricity (e): 0.03
Orbit Range: 1.55 AU - 1.65 AU
Year: 1307 Days
Day: 5.3 Hours
Environment
Temp: -174 °C
Axial Tilt: 15.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (47)
Outer Limit: 33,039,053 km
- M1: 182,958 km (0.05 R)
- M2: 280,047 km (0.103 R)
- M3: 422,464 km (0.091 R)
- M4: 558,898 km (0.111 R)
- M5: 649,105 km (0.081 R)
- M6: 745,297 km (0.036 R)
- M7: 869,612 km (0.1 R)
- M8: 1,197,980 km (0.065 R)
- M9: 1,545,496 km (0.101 R)
- M10: 1,687,763 km (0.101 R)
- M11: 1,827,338 km (0.102 R)
- M12: 2,110,676 km (0.11 R)
- M13: 2,253,842 km (0.077 R)
- M14: 2,375,764 km (0.103 R)
- M15: 2,550,195 km (0.071 R)
- M16: 2,677,503 km (0.093 R)
- M17: 2,929,725 km (0.032 R)
- M18: 3,081,417 km (0.062 R)
- M19: 3,355,480 km (0.092 R)
- M20: 3,533,352 km (0.076 R)
- M21: 3,628,197 km (0.094 R)
- M22: 3,752,812 km (0.073 R)
- M23: 3,869,199 km (0.093 R)
- M24: 4,006,530 km (0.041 R)
- M25: 4,165,403 km (0.095 R)
- M26: 4,306,324 km (0.086 R)
- M27: 4,418,074 km (0.114 R)
- M28: 4,728,041 km (0.079 R)
- M29: 4,938,675 km (0.111 R)
- M30: 5,130,908 km (0.113 R)
- M31: 5,336,605 km (0.108 R)
- M32: 5,545,144 km (0.114 R)
- M33: 5,655,847 km (0.045 R)
- M34: 5,823,546 km (0.119 R)
- M35: 5,913,604 km (0.108 R)
- M36: 6,004,111 km (0.102 R)
- M37: 6,175,251 km (0.086 R)
- M38: 6,313,329 km (0.036 R)
- M39: 6,651,271 km (0.057 R)
- M40: 6,780,972 km (0.102 R)
- M41: 6,911,571 km (0.077 R)
- M42: 7,163,195 km (0.086 R)
- M43: 7,308,454 km (0.086 R)
- M44: 7,663,301 km (0.059 R)
- M45: 7,811,851 km (0.079 R)
- M46: 7,998,998 km (0.065 R)
- M47: 8,111,945 km (0.084 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.04 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 407.3
Radius: 8.6
Gravity: 5.51 G
Time & Orbit
Eccentricity (e): 0.208
Orbit Range: 1.62 AU - 2.46 AU
Year: 1881 Days
Day: 5.4 Hours
Environment
Temp: -182 °C
Axial Tilt: 21.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (74)
Outer Limit: 33,039,053 km
- M1: 113,096 km (0.098 R)
- M2: 204,201 km (0.065 R)
- M3: 280,945 km (0.081 R)
- M4: 360,531 km (0.113 R)
- M5: 485,295 km (0.111 R)
- M6: 566,378 km (0.092 R)
- M7: 693,985 km (0.102 R)
- M8: 1,051,523 km (0.091 R)
- M9: 1,370,167 km (0.089 R)
- M10: 1,433,896 km (0.062 R)
- M11: 1,507,947 km (0.109 R)
- M12: 1,573,770 km (0.071 R)
- M13: 1,708,557 km (0.109 R)
- M14: 1,847,235 km (0.098 R)
- M15: 1,989,652 km (0.055 R)
- M16: 2,372,622 km (0.108 R)
- M17: 2,471,955 km (0.097 R)
- M18: 2,629,482 km (0.097 R)
- M19: 2,720,886 km (0.09 R)
- M20: 2,860,012 km (0.09 R)
- M21: 3,073,339 km (0.066 R)
- M22: 3,328,702 km (0.119 R)
- M23: 3,527,967 km (0.043 R)
- M24: 3,641,661 km (0.11 R)
- M25: 4,149,097 km (0.117 R)
- M26: 4,269,224 km (0.091 R)
- M27: 4,404,311 km (0.093 R)
- M28: 4,554,358 km (0.115 R)
- M29: 4,664,611 km (0.112 R)
- M30: 4,958,421 km (0.109 R)
- M31: 5,157,536 km (0.101 R)
- M32: 5,243,705 km (0.11 R)
- M33: 5,402,877 km (0.105 R)
- M34: 5,563,844 km (0.036 R)
- M35: 5,920,186 km (0.043 R)
- M36: 6,101,200 km (0.117 R)
- M37: 6,192,454 km (0.076 R)
- M38: 6,284,158 km (0.112 R)
- M39: 6,686,576 km (0.105 R)
- M40: 7,081,514 km (0.057 R)
- M41: 7,145,393 km (0.051 R)
- M42: 7,338,224 km (0.086 R)
- M43: 7,402,851 km (0.08 R)
- M44: 7,532,702 km (0.078 R)
- M45: 7,630,688 km (0.044 R)
- M46: 7,745,430 km (0.052 R)
- M47: 7,844,314 km (0.113 R)
- M48: 7,943,497 km (0.118 R)
- M49: 8,059,884 km (0.117 R)
- M50: 8,260,645 km (0.116 R)
- M51: 8,378,528 km (0.086 R)
- M52: 8,497,009 km (0.102 R)
- M53: 8,701,360 km (0.094 R)
- M54: 8,838,541 km (0.074 R)
- M55: 8,993,674 km (0.09 R)
- M56: 9,376,645 km (0.037 R)
- M57: 9,800,605 km (0.107 R)
- M58: 9,889,766 km (0.105 R)
- M59: 9,943,471 km (0.092 R)
- M60: 10,998,735 km (0.099 R)
- M61: 11,147,136 km (0.083 R)
- M62: 11,370,934 km (0.103 R)
- M63: 11,558,530 km (0.033 R)
- M64: 11,671,626 km (0.099 R)
- M65: 11,766,022 km (0.066 R)
- M66: 11,841,868 km (0.032 R)
- M67: 11,917,864 km (0.063 R)
- M68: 12,089,303 km (0.088 R)
- M69: 12,204,045 km (0.112 R)
- M70: 12,300,087 km (0.104 R)
- M71: 12,357,682 km (0.1 R)
- M72: 12,415,426 km (0.118 R)
- M73: 12,473,321 km (0.028 R)
- M74: 12,763,990 km (0.086 R)
Planet 5 - Gas Giant
Semi-Major Axis: 4.31 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 945.4
Radius: 12.6
Gravity: 5.95 G
Time & Orbit
Eccentricity (e): 0.182
Orbit Range: 3.53 AU - 5.09 AU
Year: 5777 Days
Day: 8.3 Hours
Environment
Temp: -219 °C
Axial Tilt: 34.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (78)
Outer Limit: 33,039,053 km
- M1: 285,283 km (0.117 R)
- M2: 429,795 km (0.103 R)
- M3: 698,472 km (0.088 R)
- M4: 929,003 km (0.099 R)
- M5: 1,022,352 km (0.07 R)
- M6: 1,135,448 km (0.084 R)
- M7: 1,357,601 km (0.106 R)
- M8: 1,501,514 km (0.108 R)
- M9: 1,650,962 km (0.079 R)
- M10: 2,026,004 km (0.072 R)
- M11: 2,276,880 km (0.113 R)
- M12: 2,538,077 km (0.028 R)
- M13: 2,672,416 km (0.027 R)
- M14: 2,855,375 km (0.106 R)
- M15: 3,066,158 km (0.108 R)
- M16: 3,478,599 km (0.071 R)
- M17: 3,780,488 km (0.112 R)
- M18: 4,117,233 km (0.101 R)
- M19: 4,275,956 km (0.061 R)
- M20: 4,382,918 km (0.034 R)
- M21: 4,709,341 km (0.097 R)
- M22: 4,931,344 km (0.11 R)
- M23: 5,271,081 km (0.101 R)
- M24: 5,530,783 km (0.074 R)
- M25: 5,647,619 km (0.061 R)
- M26: 6,304,952 km (0.119 R)
- M27: 6,549,993 km (0.099 R)
- M28: 7,018,085 km (0.028 R)
- M29: 7,208,373 km (0.06 R)
- M30: 7,594,186 km (0.071 R)
- M31: 7,887,997 km (0.109 R)
- M32: 8,118,976 km (0.118 R)
- M33: 8,385,858 km (0.114 R)
- M34: 8,587,965 km (0.083 R)
- M35: 9,412,399 km (0.118 R)
- M36: 10,334,071 km (0.106 R)
- M37: 10,696,248 km (0.072 R)
- M38: 11,470,417 km (0.099 R)
- M39: 11,770,061 km (0.118 R)
- M40: 12,072,399 km (0.112 R)
- M41: 12,492,170 km (0.076 R)
- M42: 13,033,565 km (0.076 R)
- M43: 13,820,150 km (0.074 R)
- M44: 14,339,704 km (0.068 R)
- M45: 14,581,753 km (0.108 R)
- M46: 14,703,227 km (0.031 R)
- M47: 14,906,530 km (0.109 R)
- M48: 15,069,742 km (0.082 R)
- M49: 15,853,485 km (0.081 R)
- M50: 16,103,762 km (0.108 R)
- M51: 16,397,423 km (0.089 R)
- M52: 17,160,671 km (0.116 R)
- M53: 17,503,549 km (0.051 R)
- M54: 17,589,568 km (0.104 R)
- M55: 18,589,779 km (0.119 R)
- M56: 19,118,907 km (0.114 R)
- M57: 19,207,619 km (0.093 R)
- M58: 19,653,121 km (0.118 R)
- M59: 19,877,069 km (0.113 R)
- M60: 19,966,977 km (0.101 R)
- M61: 21,838,297 km (0.088 R)
- M62: 22,490,245 km (0.026 R)
- M63: 25,258,104 km (0.111 R)
- M64: 25,355,493 km (0.109 R)
- M65: 25,746,093 km (0.112 R)
- M66: 26,484,059 km (0.113 R)
- M67: 27,029,642 km (0.112 R)
- M68: 27,528,851 km (0.118 R)
- M69: 27,729,312 km (0.092 R)
- M70: 28,942,700 km (0.12 R)
- M71: 29,453,278 km (0.115 R)
- M72: 29,555,902 km (0.11 R)
- M73: 31,316,369 km (0.08 R)
- M74: 32,314,935 km (0.044 R)
- M75: 32,685,489 km (0.104 R)
- M76: 33,644,860 km (0.116 R)
- M77: 33,751,972 km (0.088 R)
- M78: 35,754,938 km (0.097 R)
Planet 6 - Gas Giant
Semi-Major Axis: 5.22 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 947.8
Radius: 12.1
Gravity: 6.47 G
Time & Orbit
Eccentricity (e): 0.137
Orbit Range: 4.5 AU - 5.94 AU
Year: 7701 Days
Day: 12.3 Hours
Environment
Temp: -210 °C
Axial Tilt: 33.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (77)
Outer Limit: 33,039,053 km
- M1: 176,675 km (0.086 R)
- M2: 494,870 km (0.111 R)
- M3: 961,017 km (0.089 R)
- M4: 1,069,026 km (0.085 R)
- M5: 1,418,936 km (0.112 R)
- M6: 1,522,458 km (0.1 R)
- M7: 1,849,329 km (0.046 R)
- M8: 2,271,045 km (0.094 R)
- M9: 2,443,232 km (0.109 R)
- M10: 2,568,895 km (0.073 R)
- M11: 2,722,681 km (0.12 R)
- M12: 2,932,567 km (0.099 R)
- M13: 3,285,169 km (0.117 R)
- M14: 3,796,046 km (0.083 R)
- M15: 4,060,984 km (0.085 R)
- M16: 5,943,374 km (0.088 R)
- M17: 7,535,993 km (0.085 R)
- M18: 7,981,944 km (0.098 R)
- M19: 8,246,134 km (0.08 R)
- M20: 8,705,848 km (0.119 R)
- M21: 9,490,489 km (0.108 R)
- M22: 9,610,018 km (0.092 R)
- M23: 9,850,870 km (0.032 R)
- M24: 10,420,688 km (0.106 R)
- M25: 11,337,574 km (0.095 R)
- M26: 11,720,096 km (0.12 R)
- M27: 12,893,242 km (0.071 R)
- M28: 13,831,370 km (0.09 R)
- M29: 14,837,715 km (0.117 R)
- M30: 15,302,965 km (0.111 R)
- M31: 16,009,964 km (0.09 R)
- M32: 16,775,606 km (0.111 R)
- M33: 17,065,975 km (0.05 R)
- M34: 17,553,365 km (0.076 R)
- M35: 17,700,570 km (0.052 R)
- M36: 18,342,793 km (0.108 R)
- M37: 18,741,920 km (0.118 R)
- M38: 18,942,531 km (0.116 R)
- M39: 19,143,890 km (0.037 R)
- M40: 19,905,343 km (0.112 R)
- M41: 20,161,305 km (0.05 R)
- M42: 20,676,520 km (0.112 R)
- M43: 20,780,191 km (0.106 R)
- M44: 21,091,953 km (0.067 R)
- M45: 22,089,472 km (0.077 R)
- M46: 22,887,876 km (0.093 R)
- M47: 23,858,317 km (0.089 R)
- M48: 24,512,808 km (0.102 R)
- M49: 26,567,834 km (0.09 R)
- M50: 26,849,826 km (0.11 R)
- M51: 26,962,772 km (0.073 R)
- M52: 27,416,652 km (0.118 R)
- M53: 27,930,222 km (0.064 R)
- M54: 28,331,892 km (0.093 R)
- M55: 29,140,768 km (0.074 R)
- M56: 29,548,123 km (0.077 R)
- M57: 30,192,141 km (0.108 R)
- M58: 31,732,551 km (0.113 R)
- M59: 32,031,746 km (0.093 R)
- M60: 32,452,116 km (0.08 R)
- M61: 32,572,543 km (0.103 R)
- M62: 33,846,369 km (0.118 R)
- M63: 34,581,493 km (0.059 R)
- M64: 34,827,731 km (0.112 R)
- M65: 35,012,783 km (0.06 R)
- M66: 35,136,351 km (0.092 R)
- M67: 35,756,285 km (0.104 R)
- M68: 36,944,092 km (0.066 R)
- M69: 37,637,777 km (0.07 R)
- M70: 38,526,688 km (0.067 R)
- M71: 38,654,295 km (0.054 R)
- M72: 40,714,407 km (0.052 R)
- M73: 42,348,614 km (0.049 R)
- M74: 42,809,974 km (0.089 R)
- M75: 43,339,401 km (0.052 R)
- M76: 43,604,937 km (0.086 R)
- M77: 43,804,351 km (0.114 R)
Planet 7 - Ice Giant
Semi-Major Axis: 6.41 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 204.3
Radius: 3.8
Gravity: 14.15 G
Time & Orbit
Eccentricity (e): 0.229
Orbit Range: 4.94 AU - 7.88 AU
Year: 10479 Days
Day: 19.5 Hours
Environment
Temp: -225 °C
Axial Tilt: 24.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 33,039,053 km
- M1: 55,650 km (0.104 R)
- M2: 405,111 km (0.082 R)
- M3: 752,178 km (0.112 R)
- M4: 1,812,677 km (0.109 R)
- M5: 1,983,069 km (0.114 R)
- M6: 2,380,252 km (0.079 R)
- M7: 2,503,969 km (0.071 R)
- M8: 2,998,091 km (0.104 R)
- M9: 3,405,296 km (0.114 R)
- M10: 3,662,754 km (0.088 R)
- M11: 3,781,685 km (0.096 R)
- M12: 4,072,652 km (0.065 R)
- M13: 4,171,237 km (0.104 R)
- M14: 4,395,933 km (0.072 R)
- M15: 4,421,066 km (0.112 R)
- M16: 5,441,323 km (0.077 R)
- M17: 5,577,158 km (0.06 R)
- M18: 6,273,088 km (0.095 R)
- M19: 6,559,119 km (0.054 R)
- M20: 6,616,863 km (0.057 R)
- M21: 6,674,758 km (0.091 R)
- M22: 7,143,747 km (0.067 R)
- M23: 7,593,139 km (0.083 R)
- M24: 7,775,499 km (0.057 R)
- M25: 8,051,657 km (0.04 R)
- M26: 8,613,696 km (0.067 R)
- M27: 8,740,256 km (0.111 R)
- M28: 8,931,292 km (0.105 R)
- M29: 9,059,348 km (0.104 R)
- M30: 9,252,778 km (0.094 R)
- M31: 10,139,594 km (0.059 R)
- M32: 10,474,843 km (0.056 R)
- M33: 12,063,273 km (0.114 R)
- M34: 12,705,048 km (0.105 R)
- M35: 12,885,313 km (0.098 R)
- M36: 13,139,031 km (0.115 R)
- M37: 13,651,404 km (0.082 R)
- M38: 14,170,359 km (0.083 R)
- M39: 14,733,445 km (0.102 R)
- M40: 17,336,448 km (0.069 R)
- M41: 17,456,276 km (0.113 R)
- M42: 17,737,072 km (0.067 R)
- M43: 18,100,146 km (0.036 R)
- M44: 18,547,144 km (0.079 R)
- M45: 18,587,984 km (0.101 R)
- M46: 18,956,743 km (0.064 R)
- M47: 20,245,229 km (0.116 R)
- M48: 20,751,618 km (0.089 R)
- M49: 20,878,926 km (0.09 R)
- M50: 21,304,831 km (0.051 R)
- M51: 21,733,728 km (0.073 R)
- M52: 22,556,367 km (0.119 R)
- M53: 22,949,660 km (0.08 R)
- M54: 23,037,324 km (0.096 R)
- M55: 23,081,156 km (0.054 R)
- M56: 23,742,828 km (0.112 R)
- M57: 23,787,109 km (0.109 R)
- M58: 24,500,242 km (0.112 R)
- M59: 24,634,730 km (0.033 R)
- M60: 25,265,584 km (0.074 R)
- M61: 25,764,942 km (0.051 R)
- M62: 26,267,441 km (0.089 R)
- M63: 26,313,368 km (0.105 R)
- M64: 27,328,838 km (0.052 R)
- M65: 27,421,738 km (0.069 R)
- M66: 27,607,988 km (0.082 R)
- M67: 27,654,662 km (0.102 R)
- M68: 28,639,764 km (0.104 R)
- M69: 31,030,937 km (0.058 R)
- M70: 31,370,823 km (0.053 R)
- M71: 31,858,512 km (0.054 R)
- M72: 32,250,459 km (0.105 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: 378 - 17,844 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.