G6V Star System Generated (Seed: 1768447180)
Star Details
Spectral Class: G0V
Temperature: 5,920 K
Mass: 1.08 sol
Luminosity: 1.31 lux
Habitable Zone (HZ)
Inner Boundary: 1.09 AU
Outer Boundary: 1.57 AU
Physical Limits
Snow Line: 5.49 AU
Max System Radius: 20.8 AU
Planetary System (10 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 0.55 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.38
Radius: 1.14
Gravity: 1.06 G
Time & Orbit
Eccentricity (e): 0.066
Orbit Range: 0.51 AU - 0.59 AU
Year: 143 Days
Day: 32.3 Hours
Environment
Temp: 276 °C
Axial Tilt: 49.1 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Satellites (2)
Outer Limit: 53,748,034 km
- M1: 292,613 km (0.074 R)
- M2: 346,917 km (0.109 R)
Planet 2 - Terrestrial
Semi-Major Axis: 0.99 AU
Status: Inner (Hot)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.55
Radius: 1.66
Gravity: 1.29 G
Time & Orbit
Eccentricity (e): 0.113
Orbit Range: 0.88 AU - 1.1 AU
Year: 346 Days
Day: 46.7 Hours
Environment
Temp: 147 °C
Axial Tilt: 6.1 °
Atmosphere: Dense COâ‚‚
Biome: Volcanic/Barren
Planet 3 - Terrestrial
Semi-Major Axis: 1.58 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.16
Radius: 0.48
Gravity: 0.69 G
Time & Orbit
Eccentricity (e): 0.136
Orbit Range: 1.37 AU - 1.79 AU
Year: 698 Days
Day: 20.6 Hours
Environment
Temp: -17 °C
Axial Tilt: 22.5 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 4 - Terrestrial
Semi-Major Axis: 2.86 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.36
Radius: 1.8
Gravity: 1.35 G
Time & Orbit
Eccentricity (e): 0.139
Orbit Range: 2.46 AU - 3.26 AU
Year: 1700 Days
Day: 15.7 Hours
Environment
Temp: -90 °C
Axial Tilt: 41.3 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 5 - Terrestrial
Semi-Major Axis: 3.42 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 4.97
Radius: 1.9
Gravity: 1.38 G
Time & Orbit
Eccentricity (e): 0.109
Orbit Range: 3.05 AU - 3.79 AU
Year: 2223 Days
Day: 41.4 Hours
Environment
Temp: -96 °C
Axial Tilt: 13.6 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 53,748,034 km
- M1: 216,618 km (0.104 R)
Planet 6 - Gas Giant
Semi-Major Axis: 6.01 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 189.2
Radius: 12.6
Gravity: 1.19 G
Time & Orbit
Eccentricity (e): 0.128
Orbit Range: 5.24 AU - 6.78 AU
Year: 5178 Days
Day: 9.3 Hours
Environment
Temp: -136 °C
Axial Tilt: 10.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 53,748,034 km
- M1: 176,675 km (0.043 R)
- M2: 276,457 km (0.119 R)
- M3: 386,710 km (0.105 R)
- M4: 526,585 km (0.087 R)
- M5: 608,564 km (0.105 R)
- M6: 1,039,406 km (0.086 R)
- M7: 1,158,486 km (0.076 R)
- M8: 1,293,872 km (0.1 R)
- M9: 1,471,145 km (0.074 R)
- M10: 1,581,399 km (0.051 R)
- M11: 1,943,127 km (0.097 R)
- M12: 2,359,757 km (0.045 R)
- M13: 2,534,487 km (0.052 R)
- M14: 2,683,337 km (0.08 R)
- M15: 3,052,694 km (0.102 R)
- M16: 3,179,553 km (0.091 R)
- M17: 3,373,133 km (0.098 R)
- M18: 3,471,419 km (0.057 R)
- M19: 3,670,982 km (0.029 R)
- M20: 3,942,951 km (0.114 R)
- M21: 4,046,772 km (0.109 R)
- M22: 4,151,341 km (0.071 R)
- M23: 4,274,610 km (0.05 R)
- M24: 4,579,191 km (0.109 R)
- M25: 4,872,253 km (0.096 R)
- M26: 5,058,652 km (0.102 R)
- M27: 5,729,598 km (0.114 R)
- M28: 5,886,975 km (0.071 R)
- M29: 6,469,510 km (0.079 R)
- M30: 6,674,608 km (0.103 R)
- M31: 7,345,704 km (0.07 R)
- M32: 7,603,013 km (0.109 R)
- M33: 7,754,406 km (0.118 R)
- M34: 8,104,315 km (0.117 R)
- M35: 8,236,859 km (0.118 R)
- M36: 8,504,340 km (0.097 R)
- M37: 8,616,538 km (0.045 R)
- M38: 8,751,924 km (0.11 R)
- M39: 9,392,951 km (0.104 R)
- M40: 9,883,632 km (0.105 R)
- M41: 10,167,868 km (0.075 R)
- M42: 10,671,863 km (0.104 R)
- M43: 11,012,348 km (0.053 R)
- M44: 11,679,106 km (0.096 R)
- M45: 12,004,780 km (0.083 R)
- M46: 12,308,165 km (0.11 R)
- M47: 12,486,336 km (0.077 R)
- M48: 12,639,674 km (0.068 R)
- M49: 12,948,294 km (0.098 R)
- M50: 13,285,488 km (0.076 R)
- M51: 13,494,476 km (0.062 R)
- M52: 13,678,182 km (0.08 R)
- M53: 15,150,524 km (0.12 R)
- M54: 15,781,079 km (0.059 R)
- M55: 15,891,632 km (0.067 R)
- M56: 15,974,809 km (0.119 R)
- M57: 16,252,761 km (0.039 R)
- M58: 16,785,330 km (0.111 R)
- M59: 16,870,002 km (0.032 R)
- M60: 17,068,070 km (0.089 R)
- M61: 17,209,889 km (0.116 R)
- M62: 17,695,334 km (0.115 R)
- M63: 17,810,225 km (0.107 R)
- M64: 18,272,333 km (0.079 R)
- M65: 18,592,173 km (0.038 R)
- M66: 19,178,746 km (0.07 R)
- M67: 19,592,833 km (0.094 R)
- M68: 20,069,751 km (0.108 R)
Planet 7 - Gas Giant
Semi-Major Axis: 6.77 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 291
Radius: 11
Gravity: 2.4 G
Time & Orbit
Eccentricity (e): 0.128
Orbit Range: 5.9 AU - 7.64 AU
Year: 6191 Days
Day: 6.6 Hours
Environment
Temp: -148 °C
Axial Tilt: 46.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 53,748,034 km
- M1: 159,023 km (0.033 R)
- M2: 278,850 km (0.084 R)
- M3: 410,646 km (0.106 R)
- M4: 548,575 km (0.091 R)
- M5: 650,302 km (0.089 R)
- M6: 759,359 km (0.098 R)
- M7: 997,519 km (0.113 R)
- M8: 1,343,239 km (0.099 R)
- M9: 1,413,999 km (0.088 R)
- M10: 1,559,558 km (0.067 R)
- M11: 1,725,761 km (0.074 R)
- M12: 2,175,153 km (0.078 R)
- M13: 2,327,294 km (0.086 R)
- M14: 2,642,497 km (0.037 R)
- M15: 2,768,757 km (0.093 R)
- M16: 2,934,213 km (0.071 R)
- M17: 3,159,956 km (0.112 R)
- M18: 3,430,578 km (0.072 R)
- M19: 3,568,807 km (0.108 R)
- M20: 3,729,026 km (0.119 R)
- M21: 3,891,639 km (0.114 R)
- M22: 4,015,207 km (0.092 R)
- M23: 4,098,383 km (0.067 R)
- M24: 4,266,382 km (0.11 R)
- M25: 4,718,167 km (0.098 R)
- M26: 4,916,534 km (0.104 R)
- M27: 5,005,545 km (0.081 R)
- M28: 5,367,272 km (0.107 R)
- M29: 5,620,841 km (0.114 R)
- M30: 6,260,072 km (0.105 R)
- M31: 6,748,510 km (0.11 R)
- M32: 6,922,492 km (0.082 R)
- M33: 7,325,509 km (0.065 R)
- M34: 7,658,663 km (0.074 R)
- M35: 8,101,772 km (0.06 R)
- M36: 8,260,196 km (0.065 R)
- M37: 8,366,411 km (0.061 R)
- M38: 8,473,074 km (0.063 R)
- M39: 8,687,597 km (0.097 R)
- M40: 8,985,746 km (0.081 R)
- M41: 9,259,659 km (0.064 R)
- M42: 9,675,841 km (0.05 R)
- M43: 10,041,458 km (0.088 R)
- M44: 10,583,900 km (0.082 R)
- M45: 10,699,389 km (0.108 R)
- M46: 11,224,029 km (0.082 R)
- M47: 11,637,966 km (0.097 R)
- M48: 11,846,805 km (0.064 R)
- M49: 12,207,635 km (0.065 R)
- M50: 12,298,441 km (0.081 R)
- M51: 13,187,800 km (0.058 R)
- M52: 14,002,660 km (0.053 R)
- M53: 14,384,284 km (0.096 R)
- M54: 14,995,541 km (0.114 R)
- M55: 15,516,890 km (0.102 R)
- M56: 17,935,588 km (0.09 R)
- M57: 18,523,657 km (0.104 R)
- M58: 18,942,681 km (0.092 R)
- M59: 19,153,315 km (0.097 R)
- M60: 19,294,236 km (0.078 R)
- M61: 19,932,271 km (0.109 R)
- M62: 20,325,713 km (0.111 R)
- M63: 21,229,284 km (0.071 R)
- M64: 21,411,644 km (0.11 R)
- M65: 21,594,453 km (0.059 R)
- M66: 21,704,407 km (0.084 R)
- M67: 22,182,971 km (0.118 R)
- M68: 24,170,079 km (0.09 R)
- M69: 24,551,255 km (0.107 R)
- M70: 24,972,971 km (0.081 R)
- M71: 25,551,915 km (0.033 R)
- M72: 25,668,302 km (0.089 R)
- M73: 26,018,211 km (0.091 R)
Planet 8 - Gas Giant
Semi-Major Axis: 7.41 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 547.1
Radius: 13.4
Gravity: 3.05 G
Time & Orbit
Eccentricity (e): 0.176
Orbit Range: 6.11 AU - 8.71 AU
Year: 7089 Days
Day: 12.2 Hours
Environment
Temp: -157 °C
Axial Tilt: 36.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 53,748,034 km
- M1: 167,699 km (0.056 R)
- M2: 266,135 km (0.069 R)
- M3: 349,461 km (0.103 R)
- M4: 560,094 km (0.095 R)
- M5: 1,038,808 km (0.109 R)
- M6: 1,180,926 km (0.094 R)
- M7: 1,279,511 km (0.102 R)
- M8: 1,415,645 km (0.109 R)
- M9: 2,440,091 km (0.037 R)
- M10: 2,568,296 km (0.118 R)
- M11: 2,809,448 km (0.096 R)
- M12: 3,058,229 km (0.089 R)
- M13: 3,314,341 km (0.119 R)
- M14: 3,433,122 km (0.098 R)
- M15: 3,748,623 km (0.06 R)
- M16: 3,872,640 km (0.091 R)
- M17: 4,408,200 km (0.081 R)
- M18: 4,994,624 km (0.04 R)
- M19: 5,131,357 km (0.085 R)
- M20: 5,549,333 km (0.09 R)
- M21: 6,507,208 km (0.026 R)
- M22: 6,717,094 km (0.116 R)
- M23: 7,236,049 km (0.101 R)
- M24: 7,422,448 km (0.075 R)
- M25: 7,516,096 km (0.078 R)
- M26: 7,958,906 km (0.069 R)
- M27: 8,475,467 km (0.026 R)
- M28: 8,704,950 km (0.113 R)
- M29: 8,870,107 km (0.104 R)
- M30: 9,103,030 km (0.062 R)
- M31: 9,643,228 km (0.089 R)
- M32: 10,055,071 km (0.07 R)
- M33: 10,508,054 km (0.062 R)
- M34: 10,825,500 km (0.098 R)
- M35: 11,578,576 km (0.101 R)
- M36: 12,385,657 km (0.095 R)
- M37: 12,758,454 km (0.12 R)
- M38: 12,946,349 km (0.094 R)
- M39: 13,172,990 km (0.12 R)
- M40: 13,477,272 km (0.094 R)
- M41: 15,751,758 km (0.055 R)
- M42: 16,277,744 km (0.113 R)
- M43: 16,481,497 km (0.066 R)
- M44: 17,890,110 km (0.086 R)
- M45: 19,121,899 km (0.054 R)
- M46: 19,683,041 km (0.071 R)
- M47: 20,162,053 km (0.066 R)
- M48: 20,249,568 km (0.085 R)
- M49: 20,644,955 km (0.054 R)
- M50: 21,936,134 km (0.097 R)
- M51: 22,206,607 km (0.09 R)
- M52: 22,887,577 km (0.074 R)
- M53: 23,483,275 km (0.083 R)
- M54: 24,409,585 km (0.036 R)
- M55: 25,018,299 km (0.1 R)
- M56: 25,537,105 km (0.117 R)
- M57: 26,345,980 km (0.106 R)
- M58: 26,681,528 km (0.097 R)
- M59: 28,086,701 km (0.112 R)
- M60: 28,527,566 km (0.101 R)
- M61: 29,714,775 km (0.064 R)
- M62: 30,114,051 km (0.087 R)
- M63: 30,766,747 km (0.083 R)
- M64: 31,322,503 km (0.071 R)
- M65: 31,423,930 km (0.063 R)
- M66: 31,576,371 km (0.07 R)
- M67: 31,728,960 km (0.12 R)
- M68: 31,830,837 km (0.089 R)
- M69: 32,598,274 km (0.116 R)
- M70: 33,268,472 km (0.12 R)
- M71: 34,151,548 km (0.063 R)
- M72: 34,727,051 km (0.116 R)
- M73: 35,042,404 km (0.039 R)
Planet 9 - Gas Giant
Semi-Major Axis: 10.28 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 290.5
Radius: 12
Gravity: 2.02 G
Time & Orbit
Eccentricity (e): 0.163
Orbit Range: 8.6 AU - 11.96 AU
Year: 11584 Days
Day: 14.5 Hours
Environment
Temp: -163 °C
Axial Tilt: 8.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (79)
Outer Limit: 53,748,034 km
- M1: 188,793 km (0.07 R)
- M2: 397,332 km (0.12 R)
- M3: 477,816 km (0.112 R)
- M4: 591,660 km (0.074 R)
- M5: 789,877 km (0.118 R)
- M6: 1,438,384 km (0.069 R)
- M7: 1,514,978 km (0.095 R)
- M8: 2,047,097 km (0.092 R)
- M9: 2,199,986 km (0.093 R)
- M10: 2,289,147 km (0.087 R)
- M11: 2,425,281 km (0.072 R)
- M12: 2,874,224 km (0.086 R)
- M13: 3,662,156 km (0.094 R)
- M14: 4,039,442 km (0.078 R)
- M15: 4,316,497 km (0.061 R)
- M16: 5,214,982 km (0.062 R)
- M17: 5,547,687 km (0.084 R)
- M18: 5,701,175 km (0.101 R)
- M19: 6,043,904 km (0.066 R)
- M20: 6,716,795 km (0.056 R)
- M21: 6,814,931 km (0.095 R)
- M22: 7,178,753 km (0.071 R)
- M23: 7,582,966 km (0.09 R)
- M24: 7,960,103 km (0.114 R)
- M25: 8,098,630 km (0.106 R)
- M26: 8,378,378 km (0.038 R)
- M27: 8,519,449 km (0.092 R)
- M28: 8,661,418 km (0.113 R)
- M29: 8,803,984 km (0.118 R)
- M30: 9,055,608 km (0.113 R)
- M31: 9,935,991 km (0.104 R)
- M32: 10,010,641 km (0.1 R)
- M33: 10,273,335 km (0.091 R)
- M34: 10,767,008 km (0.07 R)
- M35: 11,229,863 km (0.112 R)
- M36: 11,659,658 km (0.05 R)
- M37: 13,063,335 km (0.074 R)
- M38: 13,145,165 km (0.088 R)
- M39: 13,432,842 km (0.105 R)
- M40: 14,562,156 km (0.114 R)
- M41: 14,646,978 km (0.109 R)
- M42: 14,817,220 km (0.11 R)
- M43: 15,202,584 km (0.066 R)
- M44: 15,939,653 km (0.12 R)
- M45: 16,866,262 km (0.072 R)
- M46: 16,955,423 km (0.069 R)
- M47: 17,810,225 km (0.118 R)
- M48: 19,234,995 km (0.115 R)
- M49: 20,410,535 km (0.067 R)
- M50: 20,553,102 km (0.105 R)
- M51: 20,743,839 km (0.052 R)
- M52: 21,464,153 km (0.084 R)
- M53: 22,437,287 km (0.091 R)
- M54: 22,781,362 km (0.104 R)
- M55: 22,929,314 km (0.086 R)
- M56: 23,723,978 km (0.045 R)
- M57: 23,823,910 km (0.073 R)
- M58: 24,174,866 km (0.077 R)
- M59: 24,325,811 km (0.108 R)
- M60: 24,882,015 km (0.114 R)
- M61: 25,340,084 km (0.06 R)
- M62: 25,493,422 km (0.089 R)
- M63: 25,595,896 km (0.098 R)
- M64: 26,368,270 km (0.058 R)
- M65: 28,731,019 km (0.116 R)
- M66: 29,104,715 km (0.088 R)
- M67: 29,426,200 km (0.078 R)
- M68: 30,560,751 km (0.108 R)
- M69: 31,379,949 km (0.067 R)
- M70: 31,599,708 km (0.042 R)
- M71: 32,984,236 km (0.115 R)
- M72: 33,937,025 km (0.091 R)
- M73: 35,583,200 km (0.061 R)
- M74: 35,869,680 km (0.099 R)
- M75: 36,444,884 km (0.072 R)
- M76: 37,023,079 km (0.113 R)
- M77: 37,429,686 km (0.09 R)
- M78: 39,188,957 km (0.05 R)
- M79: 39,307,140 km (0.104 R)
Planet 10 - Gas Giant
Semi-Major Axis: 11.12 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 568.6
Radius: 11
Gravity: 4.7 G
Time & Orbit
Eccentricity (e): 0.072
Orbit Range: 10.32 AU - 11.92 AU
Year: 13033 Days
Day: 6.2 Hours
Environment
Temp: -179 °C
Axial Tilt: 10.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (81)
Outer Limit: 53,748,034 km
- M1: 245,341 km (0.078 R)
- M2: 388,057 km (0.113 R)
- M3: 1,129,763 km (0.109 R)
- M4: 1,560,306 km (0.087 R)
- M5: 1,832,125 km (0.087 R)
- M6: 2,477,790 km (0.047 R)
- M7: 2,915,064 km (0.076 R)
- M8: 3,345,158 km (0.1 R)
- M9: 4,196,819 km (0.086 R)
- M10: 5,973,443 km (0.11 R)
- M11: 6,322,305 km (0.079 R)
- M12: 6,400,844 km (0.102 R)
- M13: 6,479,533 km (0.078 R)
- M14: 7,326,406 km (0.11 R)
- M15: 7,450,273 km (0.096 R)
- M16: 7,658,214 km (0.06 R)
- M17: 7,952,623 km (0.066 R)
- M18: 8,596,043 km (0.063 R)
- M19: 8,726,642 km (0.098 R)
- M20: 9,434,988 km (0.088 R)
- M21: 9,705,311 km (0.044 R)
- M22: 9,841,446 km (0.04 R)
- M23: 9,978,328 km (0.116 R)
- M24: 10,718,538 km (0.063 R)
- M25: 11,000,679 km (0.094 R)
- M26: 11,190,220 km (0.038 R)
- M27: 12,349,753 km (0.117 R)
- M28: 12,645,508 km (0.098 R)
- M29: 12,893,990 km (0.081 R)
- M30: 14,057,114 km (0.098 R)
- M31: 15,253,597 km (0.04 R)
- M32: 15,783,922 km (0.067 R)
- M33: 16,051,403 km (0.108 R)
- M34: 16,428,389 km (0.113 R)
- M35: 17,136,286 km (0.111 R)
- M36: 17,632,203 km (0.114 R)
- M37: 17,798,556 km (0.063 R)
- M38: 18,694,648 km (0.072 R)
- M39: 19,720,141 km (0.117 R)
- M40: 21,292,564 km (0.111 R)
- M41: 23,451,112 km (0.028 R)
- M42: 23,878,962 km (0.091 R)
- M43: 24,556,341 km (0.089 R)
- M44: 24,742,291 km (0.113 R)
- M45: 25,490,280 km (0.099 R)
- M46: 25,678,475 km (0.077 R)
- M47: 25,804,286 km (0.114 R)
- M48: 26,562,897 km (0.088 R)
- M49: 26,944,970 km (0.117 R)
- M50: 27,778,978 km (0.092 R)
- M51: 27,908,081 km (0.095 R)
- M52: 29,275,256 km (0.105 R)
- M53: 29,669,895 km (0.1 R)
- M54: 30,066,330 km (0.109 R)
- M55: 30,397,988 km (0.109 R)
- M56: 30,998,175 km (0.054 R)
- M57: 31,132,065 km (0.106 R)
- M58: 31,266,105 km (0.103 R)
- M59: 32,074,681 km (0.038 R)
- M60: 32,617,422 km (0.119 R)
- M61: 33,094,939 km (0.065 R)
- M62: 33,918,924 km (0.115 R)
- M63: 33,987,888 km (0.117 R)
- M64: 34,333,459 km (0.066 R)
- M65: 35,167,467 km (0.054 R)
- M66: 35,516,928 km (0.098 R)
- M67: 35,586,940 km (0.1 R)
- M68: 38,713,835 km (0.085 R)
- M69: 40,822,417 km (0.107 R)
- M70: 41,116,227 km (0.078 R)
- M71: 41,189,679 km (0.059 R)
- M72: 43,192,047 km (0.099 R)
- M73: 43,866,584 km (0.068 R)
- M74: 44,771,352 km (0.113 R)
- M75: 46,983,006 km (0.066 R)
- M76: 48,451,459 km (0.102 R)
- M77: 49,074,086 km (0.1 R)
- M78: 49,308,356 km (0.061 R)
- M79: 49,464,686 km (0.099 R)
- M80: 51,274,521 km (0.076 R)
- M81: 53,025,863 km (0.079 R)
Kuiper Belt
Range: 31.2 - 53.2 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 357 - 14,103 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.