Star System Generated (Seed: 1768390047)
Star Details
Spectral Class: M9V
Temperature: 2,400 K
Mass: 0.27 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: 10.4 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.57 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 253.6
Radius: 13.9
Gravity: 1.31 G
Time & Orbit
Eccentricity (e): 0.117
Orbit Range: 0.5 AU - 0.64 AU
Year: 302 Days
Day: 14.6 Hours
Environment
Temp: -153 °C
Axial Tilt: 48.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (28)
Outer Limit: 48,261,439 km
- M1: 177,573 km (0.09 R)
- M2: 285,283 km (0.117 R)
- M3: 373,695 km (0.112 R)
- M4: 493,224 km (0.117 R)
- M5: 593,006 km (0.1 R)
- M6: 680,521 km (0.095 R)
- M7: 778,956 km (0.097 R)
- M8: 906,264 km (0.113 R)
- M9: 998,566 km (0.067 R)
- M10: 1,088,175 km (0.033 R)
- M11: 1,236,426 km (0.073 R)
- M12: 1,374,804 km (0.085 R)
- M13: 1,489,995 km (0.039 R)
- M14: 1,590,674 km (0.117 R)
- M15: 1,689,858 km (0.037 R)
- M16: 1,844,841 km (0.098 R)
- M17: 1,934,001 km (0.111 R)
- M18: 2,024,658 km (0.049 R)
- M19: 2,124,888 km (0.117 R)
- M20: 2,222,725 km (0.112 R)
- M21: 2,385,039 km (0.099 R)
- M22: 2,487,065 km (0.116 R)
- M23: 2,586,098 km (0.036 R)
- M24: 2,686,628 km (0.048 R)
- M25: 2,833,234 km (0.069 R)
- M26: 2,937,055 km (0.098 R)
- M27: 3,097,574 km (0.111 R)
- M28: 3,209,323 km (0.067 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.74 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 819.3
Radius: 13.2
Gravity: 4.7 G
Time & Orbit
Eccentricity (e): 0.163
Orbit Range: 0.62 AU - 0.86 AU
Year: 447 Days
Day: 14.2 Hours
Environment
Temp: -165 °C
Axial Tilt: 34.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (41)
Outer Limit: 48,261,439 km
- M1: 164,707 km (0.116 R)
- M2: 253,718 km (0.068 R)
- M3: 341,382 km (0.064 R)
- M4: 495,019 km (0.041 R)
- M5: 649,404 km (0.102 R)
- M6: 744,100 km (0.12 R)
- M7: 894,296 km (0.113 R)
- M8: 1,050,626 km (0.063 R)
- M9: 1,150,108 km (0.098 R)
- M10: 1,284,747 km (0.118 R)
- M11: 1,424,920 km (0.101 R)
- M12: 1,513,930 km (0.068 R)
- M13: 1,792,631 km (0.05 R)
- M14: 1,889,421 km (0.092 R)
- M15: 2,037,972 km (0.115 R)
- M16: 2,132,817 km (0.109 R)
- M17: 2,268,203 km (0.085 R)
- M18: 2,664,488 km (0.102 R)
- M19: 2,796,882 km (0.116 R)
- M20: 3,010,358 km (0.098 R)
- M21: 3,155,917 km (0.099 R)
- M22: 3,326,159 km (0.1 R)
- M23: 3,431,177 km (0.043 R)
- M24: 3,583,467 km (0.032 R)
- M25: 3,668,140 km (0.096 R)
- M26: 3,784,677 km (0.061 R)
- M27: 4,093,596 km (0.093 R)
- M28: 4,394,437 km (0.083 R)
- M29: 4,526,832 km (0.096 R)
- M30: 4,804,186 km (0.046 R)
- M31: 4,914,888 km (0.116 R)
- M32: 5,035,165 km (0.09 R)
- M33: 5,191,196 km (0.066 R)
- M34: 5,331,369 km (0.114 R)
- M35: 5,446,110 km (0.043 R)
- M36: 5,534,972 km (0.118 R)
- M37: 5,741,267 km (0.091 R)
- M38: 5,886,377 km (0.085 R)
- M39: 6,124,537 km (0.111 R)
- M40: 6,226,413 km (0.096 R)
- M41: 6,403,537 km (0.093 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.83 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 24.5
Radius: 9.6
Gravity: 0.27 G
Time & Orbit
Eccentricity (e): 0.114
Orbit Range: 0.74 AU - 0.92 AU
Year: 532 Days
Day: 5.6 Hours
Environment
Temp: -157 °C
Axial Tilt: 20.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (16)
Outer Limit: 48,261,439 km
- M1: 123,717 km (0.095 R)
- M2: 184,155 km (0.052 R)
- M3: 377,286 km (0.066 R)
- M4: 454,478 km (0.056 R)
- M5: 553,213 km (0.097 R)
- M6: 738,265 km (0.105 R)
- M7: 809,025 km (0.11 R)
- M8: 953,238 km (0.054 R)
- M9: 1,033,572 km (0.117 R)
- M10: 1,211,444 km (0.116 R)
- M11: 1,309,580 km (0.097 R)
- M12: 1,389,016 km (0.066 R)
- M13: 1,522,308 km (0.099 R)
- M14: 1,840,203 km (0.116 R)
- M15: 2,023,760 km (0.1 R)
- M16: 2,125,786 km (0.095 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.24 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 795.1
Radius: 8.1
Gravity: 12.12 G
Time & Orbit
Eccentricity (e): 0.012
Orbit Range: 1.23 AU - 1.25 AU
Year: 971 Days
Day: 10 Hours
Environment
Temp: -186 °C
Axial Tilt: 42.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (63)
Outer Limit: 48,261,439 km
- M1: 105,616 km (0.111 R)
- M2: 259,552 km (0.038 R)
- M3: 343,626 km (0.066 R)
- M4: 409,300 km (0.116 R)
- M5: 611,855 km (0.062 R)
- M6: 750,084 km (0.057 R)
- M7: 819,946 km (0.087 R)
- M8: 1,050,327 km (0.112 R)
- M9: 1,158,636 km (0.093 R)
- M10: 1,301,202 km (0.052 R)
- M11: 1,363,136 km (0.079 R)
- M12: 1,457,682 km (0.098 R)
- M13: 1,538,315 km (0.071 R)
- M14: 1,620,444 km (0.079 R)
- M15: 1,695,692 km (0.094 R)
- M16: 1,972,747 km (0.099 R)
- M17: 2,044,255 km (0.082 R)
- M18: 2,189,963 km (0.115 R)
- M19: 2,264,164 km (0.094 R)
- M20: 2,329,688 km (0.069 R)
- M21: 2,511,150 km (0.085 R)
- M22: 2,588,791 km (0.101 R)
- M23: 2,746,767 km (0.097 R)
- M24: 3,187,033 km (0.097 R)
- M25: 3,474,710 km (0.118 R)
- M26: 3,528,864 km (0.102 R)
- M27: 3,616,229 km (0.11 R)
- M28: 3,860,223 km (0.062 R)
- M29: 3,927,692 km (0.072 R)
- M30: 4,018,199 km (0.075 R)
- M31: 4,098,084 km (0.071 R)
- M32: 4,178,418 km (0.044 R)
- M33: 4,236,163 km (0.099 R)
- M34: 4,317,395 km (0.113 R)
- M35: 4,422,711 km (0.114 R)
- M36: 4,493,322 km (0.069 R)
- M37: 4,695,578 km (0.11 R)
- M38: 5,171,000 km (0.118 R)
- M39: 5,382,980 km (0.096 R)
- M40: 5,483,660 km (0.03 R)
- M41: 5,880,094 km (0.104 R)
- M42: 6,088,484 km (0.037 R)
- M43: 6,140,843 km (0.08 R)
- M44: 6,232,995 km (0.112 R)
- M45: 6,458,738 km (0.111 R)
- M46: 6,741,329 km (0.097 R)
- M47: 6,890,927 km (0.1 R)
- M48: 7,041,721 km (0.115 R)
- M49: 7,472,414 km (0.092 R)
- M50: 7,712,219 km (0.102 R)
- M51: 7,797,490 km (0.098 R)
- M52: 7,925,845 km (0.049 R)
- M53: 8,476,066 km (0.109 R)
- M54: 8,578,839 km (0.034 R)
- M55: 8,681,912 km (0.118 R)
- M56: 8,948,945 km (0.074 R)
- M57: 9,068,623 km (0.087 R)
- M58: 9,173,641 km (0.105 R)
- M59: 9,339,545 km (0.092 R)
- M60: 9,430,500 km (0.119 R)
- M61: 9,951,250 km (0.119 R)
- M62: 10,308,939 km (0.063 R)
- M63: 10,402,886 km (0.039 R)
Planet 5 - Gas Giant
Semi-Major Axis: 4.74 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 916.8
Radius: 9.3
Gravity: 10.6 G
Time & Orbit
Eccentricity (e): 0.093
Orbit Range: 4.3 AU - 5.18 AU
Year: 7254 Days
Day: 6.9 Hours
Environment
Temp: -213 °C
Axial Tilt: 28.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 48,261,439 km
- M1: 126,410 km (0.112 R)
- M2: 293,960 km (0.073 R)
- M3: 591,211 km (0.026 R)
- M4: 740,659 km (0.026 R)
- M5: 853,306 km (0.076 R)
- M6: 1,420,432 km (0.072 R)
- M7: 2,017,926 km (0.094 R)
- M8: 2,272,242 km (0.098 R)
- M9: 2,812,141 km (0.095 R)
- M10: 2,992,107 km (0.119 R)
- M11: 3,175,963 km (0.082 R)
- M12: 3,637,921 km (0.085 R)
- M13: 4,063,228 km (0.104 R)
- M14: 4,150,144 km (0.093 R)
- M15: 4,296,600 km (0.09 R)
- M16: 4,504,392 km (0.111 R)
- M17: 4,564,381 km (0.047 R)
- M18: 4,868,214 km (0.071 R)
- M19: 4,991,632 km (0.063 R)
- M20: 5,527,941 km (0.08 R)
- M21: 5,884,731 km (0.088 R)
- M22: 6,383,341 km (0.05 R)
- M23: 6,484,619 km (0.059 R)
- M24: 7,314,737 km (0.061 R)
- M25: 7,742,438 km (0.12 R)
- M26: 8,288,320 km (0.12 R)
- M27: 8,473,074 km (0.106 R)
- M28: 8,846,769 km (0.063 R)
- M29: 9,960,525 km (0.032 R)
- M30: 10,553,980 km (0.073 R)
- M31: 10,834,775 km (0.114 R)
- M32: 11,158,804 km (0.099 R)
- M33: 11,609,393 km (0.107 R)
- M34: 12,486,336 km (0.064 R)
- M35: 13,125,867 km (0.116 R)
- M36: 13,775,870 km (0.076 R)
- M37: 13,863,384 km (0.104 R)
- M38: 14,347,782 km (0.054 R)
- M39: 14,614,366 km (0.061 R)
- M40: 15,834,187 km (0.114 R)
- M41: 17,039,347 km (0.068 R)
- M42: 17,558,152 km (0.103 R)
- M43: 17,652,998 km (0.083 R)
- M44: 18,273,829 km (0.092 R)
- M45: 19,389,829 km (0.111 R)
- M46: 19,783,271 km (0.108 R)
- M47: 20,478,004 km (0.039 R)
- M48: 20,778,097 km (0.092 R)
- M49: 21,484,199 km (0.072 R)
- M50: 21,942,268 km (0.042 R)
- M51: 22,609,624 km (0.103 R)
- M52: 23,964,233 km (0.105 R)
- M53: 24,757,700 km (0.098 R)
- M54: 25,237,909 km (0.119 R)
- M55: 26,045,139 km (0.072 R)
- M56: 27,574,328 km (0.049 R)
- M57: 28,796,244 km (0.092 R)
- M58: 28,908,293 km (0.11 R)
- M59: 29,470,182 km (0.052 R)
- M60: 29,583,129 km (0.105 R)
- M61: 29,865,719 km (0.078 R)
- M62: 30,719,324 km (0.104 R)
- M63: 31,292,733 km (0.083 R)
- M64: 31,465,369 km (0.055 R)
- M65: 31,811,838 km (0.098 R)
- M66: 31,927,626 km (0.079 R)
- M67: 32,101,459 km (0.071 R)
- M68: 32,508,515 km (0.12 R)
- M69: 32,741,738 km (0.106 R)
- M70: 33,034,202 km (0.081 R)
- M71: 33,327,563 km (0.096 R)
- M72: 34,153,343 km (0.098 R)
- M73: 35,584,696 km (0.117 R)
- M74: 36,792,400 km (0.062 R)
- M75: 36,853,136 km (0.047 R)
- M76: 37,401,412 km (0.062 R)
- M77: 37,584,670 km (0.072 R)
- M78: 38,075,052 km (0.103 R)
- M79: 38,876,298 km (0.109 R)
- M80: 39,000,015 km (0.077 R)
- M81: 39,932,608 km (0.12 R)
- M82: 39,994,991 km (0.053 R)
- M83: 40,244,969 km (0.109 R)
- M84: 40,998,194 km (0.097 R)
- M85: 41,692,777 km (0.119 R)
- M86: 41,882,766 km (0.11 R)
Planet 6 - Ice Giant
Semi-Major Axis: 6.15 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 397.6
Radius: 7.9
Gravity: 6.37 G
Time & Orbit
Eccentricity (e): 0.048
Orbit Range: 5.85 AU - 6.45 AU
Year: 10721 Days
Day: 19.5 Hours
Environment
Temp: -224 °C
Axial Tilt: 12.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (89)
Outer Limit: 48,261,439 km
- M1: 133,890 km (0.109 R)
- M2: 199,115 km (0.062 R)
- M3: 407,804 km (0.098 R)
- M4: 651,948 km (0.104 R)
- M5: 839,244 km (0.115 R)
- M6: 1,008,439 km (0.067 R)
- M7: 1,226,403 km (0.034 R)
- M8: 1,519,914 km (0.12 R)
- M9: 1,856,958 km (0.102 R)
- M10: 2,381,449 km (0.077 R)
- M11: 3,130,934 km (0.087 R)
- M12: 3,183,443 km (0.071 R)
- M13: 3,613,537 km (0.083 R)
- M14: 3,668,589 km (0.082 R)
- M15: 4,062,031 km (0.071 R)
- M16: 4,380,525 km (0.113 R)
- M17: 4,888,709 km (0.098 R)
- M18: 5,041,747 km (0.088 R)
- M19: 5,103,382 km (0.06 R)
- M20: 5,196,432 km (0.084 R)
- M21: 5,384,027 km (0.063 R)
- M22: 5,637,745 km (0.066 R)
- M23: 6,289,094 km (0.119 R)
- M24: 6,589,936 km (0.1 R)
- M25: 7,101,860 km (0.083 R)
- M26: 7,733,013 km (0.118 R)
- M27: 7,947,387 km (0.073 R)
- M28: 8,272,613 km (0.096 R)
- M29: 9,086,126 km (0.096 R)
- M30: 9,161,224 km (0.084 R)
- M31: 9,693,643 km (0.07 R)
- M32: 10,079,905 km (0.057 R)
- M33: 10,431,908 km (0.092 R)
- M34: 10,668,871 km (0.098 R)
- M35: 11,471,614 km (0.109 R)
- M36: 11,880,165 km (0.073 R)
- M37: 13,049,422 km (0.101 R)
- M38: 14,211,499 km (0.086 R)
- M39: 14,474,192 km (0.113 R)
- M40: 14,650,119 km (0.101 R)
- M41: 14,738,532 km (0.114 R)
- M42: 14,826,944 km (0.087 R)
- M43: 15,093,378 km (0.109 R)
- M44: 15,361,457 km (0.079 R)
- M45: 16,174,971 km (0.082 R)
- M46: 17,468,095 km (0.111 R)
- M47: 18,032,378 km (0.109 R)
- M48: 18,698,387 km (0.079 R)
- M49: 19,372,326 km (0.08 R)
- M50: 19,663,593 km (0.064 R)
- M51: 19,858,669 km (0.095 R)
- M52: 20,005,274 km (0.092 R)
- M53: 20,103,261 km (0.027 R)
- M54: 20,595,588 km (0.112 R)
- M55: 20,843,322 km (0.077 R)
- M56: 20,892,988 km (0.12 R)
- M57: 21,141,769 km (0.116 R)
- M58: 21,894,097 km (0.039 R)
- M59: 22,910,914 km (0.058 R)
- M60: 23,064,850 km (0.107 R)
- M61: 24,151,379 km (0.075 R)
- M62: 24,517,296 km (0.09 R)
- M63: 24,674,673 km (0.038 R)
- M64: 24,885,007 km (0.07 R)
- M65: 25,785,587 km (0.076 R)
- M66: 25,945,656 km (0.058 R)
- M67: 26,427,810 km (0.066 R)
- M68: 26,750,942 km (0.028 R)
- M69: 26,858,802 km (0.118 R)
- M70: 27,455,398 km (0.072 R)
- M71: 27,509,702 km (0.033 R)
- M72: 27,837,172 km (0.08 R)
- M73: 28,440,799 km (0.061 R)
- M74: 28,827,210 km (0.029 R)
- M75: 28,882,412 km (0.05 R)
- M76: 29,326,419 km (0.098 R)
- M77: 30,052,716 km (0.06 R)
- M78: 30,502,557 km (0.117 R)
- M79: 31,238,429 km (0.1 R)
- M80: 31,352,123 km (0.117 R)
- M81: 32,381,805 km (0.111 R)
- M82: 33,248,276 km (0.087 R)
- M83: 33,771,869 km (0.111 R)
- M84: 34,532,873 km (0.109 R)
- M85: 34,650,457 km (0.117 R)
- M86: 35,063,198 km (0.117 R)
- M87: 37,754,314 km (0.093 R)
- M88: 38,849,370 km (0.073 R)
- M89: 39,339,303 km (0.109 R)
Planet 7 - Ice Giant
Semi-Major Axis: 7.89 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 288.1
Radius: 7.6
Gravity: 4.99 G
Time & Orbit
Eccentricity (e): 0.072
Orbit Range: 7.32 AU - 8.46 AU
Year: 15578 Days
Day: 23 Hours
Environment
Temp: -235 °C
Axial Tilt: 77.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 48,261,439 km
- M1: 98,884 km (0.098 R)
- M2: 383,270 km (0.073 R)
- M3: 465,549 km (0.102 R)
- M4: 732,880 km (0.118 R)
- M5: 784,790 km (0.09 R)
- M6: 874,400 km (0.117 R)
- M7: 1,064,090 km (0.116 R)
- M8: 1,330,523 km (0.087 R)
- M9: 2,096,764 km (0.064 R)
- M10: 2,326,247 km (0.097 R)
- M11: 2,457,145 km (0.108 R)
- M12: 2,699,194 km (0.118 R)
- M13: 2,781,623 km (0.036 R)
- M14: 2,892,774 km (0.04 R)
- M15: 2,948,873 km (0.115 R)
- M16: 3,206,182 km (0.114 R)
- M17: 3,381,660 km (0.083 R)
- M18: 3,500,441 km (0.095 R)
- M19: 5,166,811 km (0.117 R)
- M20: 6,079,358 km (0.079 R)
- M21: 6,406,678 km (0.117 R)
- M22: 7,116,670 km (0.116 R)
- M23: 7,890,689 km (0.093 R)
- M24: 8,088,458 km (0.12 R)
- M25: 8,327,814 km (0.119 R)
- M26: 8,488,782 km (0.099 R)
- M27: 8,936,528 km (0.119 R)
- M28: 9,392,054 km (0.109 R)
- M29: 9,601,640 km (0.03 R)
- M30: 10,891,174 km (0.115 R)
- M31: 11,199,794 km (0.058 R)
- M32: 11,466,677 km (0.099 R)
- M33: 12,463,148 km (0.081 R)
- M34: 12,693,379 km (0.086 R)
- M35: 13,018,306 km (0.077 R)
- M36: 13,628,815 km (0.1 R)
- M37: 13,676,088 km (0.109 R)
- M38: 13,770,933 km (0.092 R)
- M39: 14,104,686 km (0.116 R)
- M40: 14,344,790 km (0.082 R)
- M41: 14,392,961 km (0.116 R)
- M42: 15,073,033 km (0.089 R)
- M43: 15,269,155 km (0.109 R)
- M44: 15,367,591 km (0.104 R)
- M45: 16,514,707 km (0.11 R)
- M46: 17,021,994 km (0.046 R)
- M47: 17,431,593 km (0.057 R)
- M48: 18,626,880 km (0.08 R)
- M49: 18,784,855 km (0.063 R)
- M50: 18,837,513 km (0.107 R)
- M51: 18,995,938 km (0.055 R)
- M52: 19,048,895 km (0.114 R)
- M53: 19,101,853 km (0.076 R)
- M54: 19,261,175 km (0.079 R)
- M55: 19,794,940 km (0.096 R)
- M56: 20,009,912 km (0.09 R)
- M57: 21,205,648 km (0.073 R)
- M58: 21,370,505 km (0.103 R)
- M59: 23,042,410 km (0.085 R)
- M60: 23,211,905 km (0.115 R)
- M61: 24,065,660 km (0.032 R)
- M62: 25,045,526 km (0.068 R)
- M63: 25,511,224 km (0.112 R)
- M64: 26,332,965 km (0.102 R)
- M65: 27,881,902 km (0.065 R)
- M66: 28,728,326 km (0.106 R)
- M67: 29,032,608 km (0.066 R)
- M68: 29,215,567 km (0.078 R)
- M69: 31,693,206 km (0.073 R)
- M70: 32,386,293 km (0.053 R)
- M71: 33,403,260 km (0.114 R)
- M72: 34,624,577 km (0.115 R)
- M73: 34,689,353 km (0.115 R)
- M74: 35,078,158 km (0.117 R)
- M75: 35,795,031 km (0.109 R)
- M76: 36,385,194 km (0.09 R)
- M77: 36,780,282 km (0.076 R)
- M78: 38,375,145 km (0.066 R)
- M79: 38,979,072 km (0.105 R)
- M80: 39,181,178 km (0.114 R)
- M81: 39,248,497 km (0.077 R)
- M82: 39,856,912 km (0.112 R)
- M83: 40,196,349 km (0.11 R)
- M84: 40,332,334 km (0.054 R)
- M85: 40,604,752 km (0.095 R)
- M86: 41,083,166 km (0.072 R)
- M87: 42,114,493 km (0.108 R)
- M88: 43,712,199 km (0.105 R)
- M89: 44,062,108 km (0.114 R)
- M90: 45,754,958 km (0.104 R)
- M91: 46,323,878 km (0.097 R)
- M92: 46,466,445 km (0.074 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: 163 - 10,873 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.