Star System Generated (Seed: 1766171941)
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 (9 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.52 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.28
Radius: 1.61
Gravity: 1.27 G
Time & Orbit
Eccentricity (e): 0.138
Orbit Range: 0.45 AU - 0.59 AU
Year: 242 Days
Day: 42.8 Hours
Environment
Temp: -111 °C
Axial Tilt: 10.7 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 47,858,861 km
- M1: 574,605 km (0.12 R)
Planet 2 - Terrestrial
Semi-Major Axis: 0.61 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 2.25
Radius: 1.38
Gravity: 1.18 G
Time & Orbit
Eccentricity (e): 0.062
Orbit Range: 0.57 AU - 0.65 AU
Year: 308 Days
Day: 42.5 Hours
Environment
Temp: -138 °C
Axial Tilt: 6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 3 - Terrestrial
Semi-Major Axis: 0.62 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.27
Radius: 1.79
Gravity: 1.33 G
Time & Orbit
Eccentricity (e): 0.162
Orbit Range: 0.52 AU - 0.72 AU
Year: 315 Days
Day: 30.8 Hours
Environment
Temp: -124 °C
Axial Tilt: 43.7 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 47,858,861 km
- M1: 222,901 km (0.084 R)
Planet 4 - Gas Giant
Semi-Major Axis: 0.77 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 989.7
Radius: 13.8
Gravity: 5.2 G
Time & Orbit
Eccentricity (e): 0.215
Orbit Range: 0.6 AU - 0.94 AU
Year: 436 Days
Day: 10.8 Hours
Environment
Temp: -135 °C
Axial Tilt: 39.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (43)
Outer Limit: 47,858,861 km
- M1: 171,888 km (0.042 R)
- M2: 275,110 km (0.094 R)
- M3: 460,761 km (0.083 R)
- M4: 638,484 km (0.115 R)
- M5: 778,956 km (0.054 R)
- M6: 870,061 km (0.075 R)
- M7: 989,590 km (0.034 R)
- M8: 1,141,133 km (0.095 R)
- M9: 1,350,570 km (0.11 R)
- M10: 1,457,532 km (0.045 R)
- M11: 1,614,610 km (0.105 R)
- M12: 1,814,622 km (0.119 R)
- M13: 1,902,137 km (0.037 R)
- M14: 1,991,148 km (0.038 R)
- M15: 2,094,520 km (0.097 R)
- M16: 2,354,521 km (0.114 R)
- M17: 2,485,269 km (0.111 R)
- M18: 2,597,169 km (0.111 R)
- M19: 2,725,075 km (0.043 R)
- M20: 2,891,876 km (0.03 R)
- M21: 3,024,869 km (0.118 R)
- M22: 3,167,436 km (0.042 R)
- M23: 3,273,949 km (0.105 R)
- M24: 3,420,406 km (0.12 R)
- M25: 3,537,690 km (0.068 R)
- M26: 3,688,336 km (0.097 R)
- M27: 3,906,000 km (0.093 R)
- M28: 4,004,137 km (0.057 R)
- M29: 4,269,822 km (0.12 R)
- M30: 4,524,288 km (0.059 R)
- M31: 4,610,307 km (0.091 R)
- M32: 4,696,775 km (0.089 R)
- M33: 4,854,002 km (0.098 R)
- M34: 4,959,768 km (0.097 R)
- M35: 5,173,543 km (0.116 R)
- M36: 5,344,982 km (0.105 R)
- M37: 5,445,213 km (0.085 R)
- M38: 5,536,767 km (0.11 R)
- M39: 5,647,469 km (0.103 R)
- M40: 5,927,217 km (0.082 R)
- M41: 6,125,883 km (0.111 R)
- M42: 6,221,177 km (0.071 R)
- M43: 6,666,380 km (0.051 R)
Planet 5 - Gas Giant
Semi-Major Axis: 0.97 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 719
Radius: 10.7
Gravity: 6.28 G
Time & Orbit
Eccentricity (e): 0.003
Orbit Range: 0.97 AU - 0.97 AU
Year: 617 Days
Day: 10.6 Hours
Environment
Temp: -148 °C
Axial Tilt: 23.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (51)
Outer Limit: 47,858,861 km
- M1: 133,292 km (0.102 R)
- M2: 221,704 km (0.045 R)
- M3: 289,621 km (0.088 R)
- M4: 479,312 km (0.11 R)
- M5: 694,134 km (0.103 R)
- M6: 766,539 km (0.092 R)
- M7: 857,196 km (0.053 R)
- M8: 984,204 km (0.088 R)
- M9: 1,072,617 km (0.104 R)
- M10: 1,158,187 km (0.079 R)
- M11: 1,281,904 km (0.102 R)
- M12: 1,479,224 km (0.1 R)
- M13: 1,581,848 km (0.079 R)
- M14: 1,706,762 km (0.103 R)
- M15: 1,801,009 km (0.056 R)
- M16: 1,911,113 km (0.069 R)
- M17: 2,016,280 km (0.073 R)
- M18: 2,174,106 km (0.025 R)
- M19: 2,456,547 km (0.088 R)
- M20: 2,579,067 km (0.103 R)
- M21: 2,854,477 km (0.086 R)
- M22: 2,991,658 km (0.087 R)
- M23: 3,255,848 km (0.044 R)
- M24: 3,382,408 km (0.089 R)
- M25: 3,502,086 km (0.082 R)
- M26: 3,657,818 km (0.071 R)
- M27: 3,904,953 km (0.08 R)
- M28: 4,030,615 km (0.111 R)
- M29: 4,103,021 km (0.092 R)
- M30: 4,230,777 km (0.086 R)
- M31: 4,378,430 km (0.114 R)
- M32: 4,822,138 km (0.111 R)
- M33: 4,889,457 km (0.106 R)
- M34: 5,112,956 km (0.103 R)
- M35: 5,230,839 km (0.098 R)
- M36: 5,399,436 km (0.057 R)
- M37: 5,539,759 km (0.117 R)
- M38: 5,711,647 km (0.062 R)
- M39: 5,844,340 km (0.075 R)
- M40: 6,019,519 km (0.082 R)
- M41: 6,206,816 km (0.116 R)
- M42: 6,385,436 km (0.119 R)
- M43: 6,587,243 km (0.096 R)
- M44: 6,715,748 km (0.101 R)
- M45: 6,791,145 km (0.116 R)
- M46: 6,877,613 km (0.107 R)
- M47: 7,029,754 km (0.096 R)
- M48: 7,117,268 km (0.045 R)
- M49: 7,293,345 km (0.061 R)
- M50: 7,404,047 km (0.05 R)
- M51: 7,593,738 km (0.057 R)
Planet 6 - Gas Giant
Semi-Major Axis: 1.82 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 954.9
Radius: 10.9
Gravity: 8.04 G
Time & Orbit
Eccentricity (e): 0.237
Orbit Range: 1.39 AU - 2.25 AU
Year: 1585 Days
Day: 5.3 Hours
Environment
Temp: -181 °C
Axial Tilt: 37.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 47,858,861 km
- M1: 141,071 km (0.117 R)
- M2: 241,750 km (0.109 R)
- M3: 325,226 km (0.117 R)
- M4: 480,808 km (0.06 R)
- M5: 576,550 km (0.105 R)
- M6: 781,948 km (0.098 R)
- M7: 898,335 km (0.105 R)
- M8: 1,130,661 km (0.087 R)
- M9: 1,206,208 km (0.108 R)
- M10: 1,303,297 km (0.117 R)
- M11: 1,464,114 km (0.072 R)
- M12: 1,536,669 km (0.114 R)
- M13: 1,929,513 km (0.047 R)
- M14: 2,208,813 km (0.069 R)
- M15: 2,292,887 km (0.114 R)
- M16: 2,439,343 km (0.097 R)
- M17: 2,513,693 km (0.027 R)
- M18: 2,937,055 km (0.028 R)
- M19: 3,029,806 km (0.083 R)
- M20: 3,410,532 km (0.117 R)
- M21: 3,480,095 km (0.074 R)
- M22: 3,606,655 km (0.045 R)
- M23: 4,069,212 km (0.07 R)
- M24: 4,217,613 km (0.064 R)
- M25: 4,337,590 km (0.12 R)
- M26: 4,535,209 km (0.115 R)
- M27: 4,627,361 km (0.098 R)
- M28: 4,766,787 km (0.041 R)
- M29: 4,923,416 km (0.107 R)
- M30: 5,177,732 km (0.111 R)
- M31: 5,290,230 km (0.074 R)
- M32: 5,600,047 km (0.107 R)
- M33: 5,832,073 km (0.113 R)
- M34: 5,982,868 km (0.094 R)
- M35: 6,067,241 km (0.115 R)
- M36: 6,254,238 km (0.039 R)
- M37: 6,564,504 km (0.052 R)
- M38: 6,669,073 km (0.12 R)
- M39: 6,844,551 km (0.106 R)
- M40: 6,932,814 km (0.106 R)
- M41: 7,039,328 km (0.115 R)
- M42: 7,217,948 km (0.06 R)
- M43: 7,289,904 km (0.06 R)
- M44: 7,543,473 km (0.12 R)
- M45: 7,689,630 km (0.084 R)
- M46: 7,873,785 km (0.098 R)
- M47: 8,022,036 km (0.082 R)
- M48: 8,096,686 km (0.101 R)
- M49: 8,171,335 km (0.118 R)
- M50: 8,378,079 km (0.099 R)
- M51: 8,624,766 km (0.069 R)
- M52: 8,912,293 km (0.046 R)
- M53: 9,635,000 km (0.08 R)
- M54: 9,734,184 km (0.081 R)
- M55: 9,953,494 km (0.067 R)
- M56: 11,303,166 km (0.117 R)
- M57: 11,765,873 km (0.077 R)
- M58: 12,299,189 km (0.113 R)
- M59: 12,471,526 km (0.074 R)
- M60: 12,796,751 km (0.113 R)
- M61: 12,949,491 km (0.118 R)
- M62: 13,411,449 km (0.11 R)
- M63: 14,035,871 km (0.057 R)
- M64: 14,396,850 km (0.114 R)
- M65: 14,532,984 km (0.073 R)
- M66: 14,944,229 km (0.059 R)
- M67: 15,220,387 km (0.119 R)
- M68: 15,591,240 km (0.088 R)
Planet 7 - Gas Giant
Semi-Major Axis: 2.54 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 497.6
Radius: 10.2
Gravity: 4.78 G
Time & Orbit
Eccentricity (e): 0.249
Orbit Range: 1.91 AU - 3.17 AU
Year: 2614 Days
Day: 12.1 Hours
Environment
Temp: -191 °C
Axial Tilt: 18.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (61)
Outer Limit: 47,858,861 km
- M1: 187,895 km (0.112 R)
- M2: 261,497 km (0.059 R)
- M3: 346,319 km (0.109 R)
- M4: 423,362 km (0.043 R)
- M5: 500,554 km (0.087 R)
- M6: 764,894 km (0.078 R)
- M7: 1,309,580 km (0.115 R)
- M8: 2,055,774 km (0.078 R)
- M9: 2,195,798 km (0.04 R)
- M10: 2,391,920 km (0.065 R)
- M11: 2,499,032 km (0.062 R)
- M12: 3,307,310 km (0.11 R)
- M13: 3,381,959 km (0.045 R)
- M14: 3,716,909 km (0.044 R)
- M15: 4,014,908 km (0.113 R)
- M16: 4,158,821 km (0.074 R)
- M17: 4,255,760 km (0.114 R)
- M18: 4,418,822 km (0.116 R)
- M19: 4,751,528 km (0.096 R)
- M20: 5,057,904 km (0.086 R)
- M21: 5,565,041 km (0.106 R)
- M22: 5,779,714 km (0.05 R)
- M23: 5,924,375 km (0.062 R)
- M24: 6,143,536 km (0.101 R)
- M25: 6,291,189 km (0.076 R)
- M26: 6,722,180 km (0.095 R)
- M27: 6,931,767 km (0.077 R)
- M28: 7,008,511 km (0.118 R)
- M29: 7,085,554 km (0.05 R)
- M30: 7,182,343 km (0.098 R)
- M31: 7,712,069 km (0.064 R)
- M32: 7,991,668 km (0.108 R)
- M33: 8,356,238 km (0.095 R)
- M34: 8,913,191 km (0.069 R)
- M35: 9,101,534 km (0.12 R)
- M36: 9,270,131 km (0.093 R)
- M37: 9,461,018 km (0.111 R)
- M38: 9,911,308 km (0.065 R)
- M39: 10,237,431 km (0.079 R)
- M40: 10,744,119 km (0.118 R)
- M41: 10,877,710 km (0.078 R)
- M42: 10,967,020 km (0.12 R)
- M43: 11,759,141 km (0.084 R)
- M44: 11,873,882 km (0.088 R)
- M45: 12,452,826 km (0.098 R)
- M46: 12,546,325 km (0.033 R)
- M47: 12,757,557 km (0.055 R)
- M48: 12,993,622 km (0.066 R)
- M49: 13,159,825 km (0.11 R)
- M50: 13,255,119 km (0.114 R)
- M51: 13,350,563 km (0.111 R)
- M52: 13,614,304 km (0.085 R)
- M53: 13,831,370 km (0.099 R)
- M54: 14,220,175 km (0.106 R)
- M55: 14,884,390 km (0.106 R)
- M56: 14,958,740 km (0.098 R)
- M57: 15,357,867 km (0.113 R)
- M58: 15,533,495 km (0.092 R)
- M59: 16,473,269 km (0.091 R)
- M60: 17,379,084 km (0.11 R)
- M61: 17,536,012 km (0.118 R)
Planet 8 - Gas Giant
Semi-Major Axis: 5.04 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 316.9
Radius: 12.2
Gravity: 2.13 G
Time & Orbit
Eccentricity (e): 0.026
Orbit Range: 4.91 AU - 5.17 AU
Year: 7306 Days
Day: 13.2 Hours
Environment
Temp: -223 °C
Axial Tilt: 31.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 47,858,861 km
- M1: 152,739 km (0.102 R)
- M2: 242,797 km (0.09 R)
- M3: 347,665 km (0.114 R)
- M4: 437,275 km (0.097 R)
- M5: 537,655 km (0.085 R)
- M6: 693,985 km (0.036 R)
- M7: 893,099 km (0.06 R)
- M8: 1,000,211 km (0.115 R)
- M9: 1,303,297 km (0.042 R)
- M10: 1,426,715 km (0.031 R)
- M11: 1,521,859 km (0.105 R)
- M12: 2,342,104 km (0.104 R)
- M13: 2,513,244 km (0.083 R)
- M14: 2,668,826 km (0.048 R)
- M15: 2,827,849 km (0.114 R)
- M16: 3,239,093 km (0.071 R)
- M17: 3,824,619 km (0.03 R)
- M18: 4,419,420 km (0.109 R)
- M19: 4,560,940 km (0.042 R)
- M20: 5,018,859 km (0.075 R)
- M21: 5,441,323 km (0.117 R)
- M22: 5,542,302 km (0.119 R)
- M23: 6,426,725 km (0.118 R)
- M24: 6,533,687 km (0.102 R)
- M25: 6,641,248 km (0.09 R)
- M26: 7,049,949 km (0.081 R)
- M27: 7,354,830 km (0.057 R)
- M28: 7,777,593 km (0.043 R)
- M29: 8,266,479 km (0.115 R)
- M30: 8,500,001 km (0.077 R)
- M31: 8,824,629 km (0.098 R)
- M32: 9,123,376 km (0.105 R)
- M33: 9,608,222 km (0.107 R)
- M34: 9,761,560 km (0.096 R)
- M35: 9,853,862 km (0.064 R)
- M36: 10,070,480 km (0.091 R)
- M37: 10,194,945 km (0.068 R)
- M38: 10,382,691 km (0.116 R)
- M39: 10,888,930 km (0.106 R)
- M40: 11,016,836 km (0.08 R)
- M41: 12,123,411 km (0.081 R)
- M42: 12,959,664 km (0.116 R)
- M43: 13,538,906 km (0.055 R)
- M44: 13,710,944 km (0.083 R)
- M45: 14,406,125 km (0.083 R)
- M46: 14,546,598 km (0.117 R)
- M47: 14,864,194 km (0.054 R)
- M48: 15,112,826 km (0.065 R)
- M49: 15,362,953 km (0.026 R)
- M50: 15,506,418 km (0.116 R)
- M51: 15,903,301 km (0.087 R)
- M52: 16,523,384 km (0.08 R)
- M53: 17,262,996 km (0.085 R)
- M54: 17,561,892 km (0.035 R)
- M55: 17,862,584 km (0.12 R)
- M56: 18,468,904 km (0.103 R)
- M57: 18,774,533 km (0.042 R)
- M58: 18,889,574 km (0.074 R)
- M59: 19,779,681 km (0.116 R)
- M60: 19,857,771 km (0.063 R)
- M61: 20,053,295 km (0.075 R)
- M62: 20,643,758 km (0.081 R)
- M63: 20,841,975 km (0.115 R)
- M64: 21,319,941 km (0.095 R)
- M65: 21,600,586 km (0.09 R)
- M66: 21,801,646 km (0.119 R)
- M67: 21,922,670 km (0.075 R)
- M68: 22,775,827 km (0.11 R)
- M69: 23,474,449 km (0.098 R)
- M70: 24,305,465 km (0.078 R)
- M71: 25,569,866 km (0.075 R)
- M72: 26,467,603 km (0.115 R)
- M73: 27,071,979 km (0.06 R)
- M74: 27,986,919 km (0.076 R)
- M75: 28,558,383 km (0.038 R)
- M76: 29,668,250 km (0.077 R)
Planet 9 - Gas Giant
Semi-Major Axis: 5.53 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 967.1
Radius: 8.2
Gravity: 14.38 G
Time & Orbit
Eccentricity (e): 0.018
Orbit Range: 5.43 AU - 5.63 AU
Year: 8397 Days
Day: 14.4 Hours
Environment
Temp: -211 °C
Axial Tilt: 37.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (88)
Outer Limit: 47,858,861 km
- M1: 118,930 km (0.104 R)
- M2: 198,666 km (0.109 R)
- M3: 428,149 km (0.091 R)
- M4: 651,948 km (0.118 R)
- M5: 948,750 km (0.036 R)
- M6: 1,122,433 km (0.031 R)
- M7: 1,306,438 km (0.073 R)
- M8: 1,478,326 km (0.071 R)
- M9: 1,544,748 km (0.092 R)
- M10: 1,964,370 km (0.108 R)
- M11: 2,212,553 km (0.119 R)
- M12: 2,821,117 km (0.084 R)
- M13: 2,932,118 km (0.057 R)
- M14: 3,273,800 km (0.106 R)
- M15: 3,449,428 km (0.058 R)
- M16: 3,508,668 km (0.106 R)
- M17: 3,902,111 km (0.067 R)
- M18: 4,246,036 km (0.118 R)
- M19: 5,301,150 km (0.108 R)
- M20: 5,369,816 km (0.092 R)
- M21: 6,876,715 km (0.057 R)
- M22: 7,139,858 km (0.068 R)
- M23: 7,368,144 km (0.118 R)
- M24: 7,560,228 km (0.064 R)
- M25: 7,676,166 km (0.059 R)
- M26: 7,949,182 km (0.11 R)
- M27: 8,424,754 km (0.071 R)
- M28: 8,545,030 km (0.062 R)
- M29: 9,403,273 km (0.101 R)
- M30: 9,990,595 km (0.096 R)
- M31: 10,374,463 km (0.053 R)
- M32: 10,546,650 km (0.097 R)
- M33: 11,025,064 km (0.086 R)
- M34: 11,112,728 km (0.103 R)
- M35: 12,869,606 km (0.071 R)
- M36: 13,101,034 km (0.071 R)
- M37: 13,333,808 km (0.098 R)
- M38: 13,945,514 km (0.095 R)
- M39: 14,278,668 km (0.092 R)
- M40: 14,952,906 km (0.106 R)
- M41: 15,147,532 km (0.096 R)
- M42: 16,482,544 km (0.086 R)
- M43: 16,582,924 km (0.081 R)
- M44: 16,834,847 km (0.115 R)
- M45: 18,216,682 km (0.113 R)
- M46: 18,528,743 km (0.113 R)
- M47: 19,052,785 km (0.064 R)
- M48: 19,263,718 km (0.042 R)
- M49: 19,369,484 km (0.078 R)
- M50: 19,475,399 km (0.109 R)
- M51: 21,033,461 km (0.106 R)
- M52: 21,360,781 km (0.11 R)
- M53: 21,689,746 km (0.059 R)
- M54: 22,297,413 km (0.057 R)
- M55: 22,464,065 km (0.095 R)
- M56: 23,078,763 km (0.032 R)
- M57: 25,128,852 km (0.056 R)
- M58: 25,708,544 km (0.07 R)
- M59: 25,883,424 km (0.085 R)
- M60: 26,117,095 km (0.112 R)
- M61: 26,292,723 km (0.061 R)
- M62: 26,410,158 km (0.078 R)
- M63: 27,117,905 km (0.106 R)
- M64: 27,177,146 km (0.117 R)
- M65: 28,793,701 km (0.065 R)
- M66: 29,827,422 km (0.05 R)
- M67: 30,072,314 km (0.119 R)
- M68: 30,564,341 km (0.108 R)
- M69: 31,680,939 km (0.118 R)
- M70: 31,930,918 km (0.074 R)
- M71: 32,118,812 km (0.119 R)
- M72: 32,307,156 km (0.041 R)
- M73: 33,190,532 km (0.112 R)
- M74: 33,762,743 km (0.087 R)
- M75: 34,466,452 km (0.097 R)
- M76: 35,368,976 km (0.101 R)
- M77: 36,606,449 km (0.112 R)
- M78: 36,671,973 km (0.089 R)
- M79: 37,000,041 km (0.112 R)
- M80: 38,855,803 km (0.108 R)
- M81: 39,929,766 km (0.086 R)
- M82: 41,490,670 km (0.103 R)
- M83: 43,556,467 km (0.103 R)
- M84: 44,531,845 km (0.067 R)
- M85: 45,233,011 km (0.083 R)
- M86: 46,433,384 km (0.098 R)
- M87: 46,646,262 km (0.052 R)
- M88: 47,715,737 km (0.095 R)
Kuiper Belt
Range: 30 - 49 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 325 - 19,263 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.