Star System Generated (Seed: 1768784921)
Star Details
Spectral Class: M6V
Temperature: 2,833 K
Mass: 0.29 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: 10.8 AU
Planetary System (7 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.56 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 656.6
Radius: 11.3
Gravity: 5.14 G
Time & Orbit
Eccentricity (e): 0.176
Orbit Range: 0.46 AU - 0.66 AU
Year: 284 Days
Day: 10.5 Hours
Environment
Temp: -153 °C
Axial Tilt: 10.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (36)
Outer Limit: 22,638,805 km
- M1: 144,212 km (0.111 R)
- M2: 236,963 km (0.045 R)
- M3: 347,217 km (0.085 R)
- M4: 423,512 km (0.111 R)
- M5: 501,751 km (0.084 R)
- M6: 580,290 km (0.109 R)
- M7: 679,623 km (0.052 R)
- M8: 802,593 km (0.028 R)
- M9: 904,618 km (0.089 R)
- M10: 1,003,951 km (0.118 R)
- M11: 1,146,518 km (0.078 R)
- M12: 1,255,126 km (0.114 R)
- M13: 1,329,476 km (0.119 R)
- M14: 1,418,337 km (0.046 R)
- M15: 1,517,970 km (0.061 R)
- M16: 1,602,044 km (0.11 R)
- M17: 1,683,425 km (0.087 R)
- M18: 1,756,877 km (0.091 R)
- M19: 1,916,648 km (0.116 R)
- M20: 2,066,695 km (0.094 R)
- M21: 2,246,062 km (0.087 R)
- M22: 2,332,530 km (0.116 R)
- M23: 2,414,958 km (0.041 R)
- M24: 2,588,193 km (0.113 R)
- M25: 2,662,842 km (0.101 R)
- M26: 2,738,389 km (0.099 R)
- M27: 2,936,008 km (0.091 R)
- M28: 3,025,318 km (0.034 R)
- M29: 3,368,495 km (0.066 R)
- M30: 3,556,689 km (0.114 R)
- M31: 3,646,149 km (0.101 R)
- M32: 3,718,255 km (0.095 R)
- M33: 3,863,963 km (0.116 R)
- M34: 3,962,249 km (0.094 R)
- M35: 4,055,000 km (0.097 R)
- M36: 4,148,648 km (0.091 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.17 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 133.9
Radius: 11.6
Gravity: 1 G
Time & Orbit
Eccentricity (e): 0.065
Orbit Range: 1.09 AU - 1.25 AU
Year: 858 Days
Day: 7.3 Hours
Environment
Temp: -177 °C
Axial Tilt: 20.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (36)
Outer Limit: 22,638,805 km
- M1: 148,700 km (0.046 R)
- M2: 225,594 km (0.047 R)
- M3: 308,321 km (0.112 R)
- M4: 423,212 km (0.09 R)
- M5: 503,846 km (0.034 R)
- M6: 721,660 km (0.12 R)
- M7: 875,297 km (0.099 R)
- M8: 954,285 km (0.076 R)
- M9: 1,049,279 km (0.114 R)
- M10: 1,165,816 km (0.09 R)
- M11: 1,291,778 km (0.107 R)
- M12: 1,373,608 km (0.076 R)
- M13: 1,492,239 km (0.115 R)
- M14: 1,666,371 km (0.108 R)
- M15: 1,750,744 km (0.1 R)
- M16: 1,923,829 km (0.106 R)
- M17: 2,051,884 km (0.076 R)
- M18: 2,148,525 km (0.106 R)
- M19: 2,648,331 km (0.115 R)
- M20: 2,804,062 km (0.092 R)
- M21: 2,962,935 km (0.065 R)
- M22: 3,157,562 km (0.116 R)
- M23: 3,309,703 km (0.071 R)
- M24: 3,518,692 km (0.099 R)
- M25: 3,697,311 km (0.078 R)
- M26: 3,836,886 km (0.114 R)
- M27: 3,921,409 km (0.087 R)
- M28: 4,099,580 km (0.072 R)
- M29: 4,273,263 km (0.077 R)
- M30: 4,353,597 km (0.075 R)
- M31: 4,456,670 km (0.097 R)
- M32: 4,582,931 km (0.07 R)
- M33: 4,695,428 km (0.106 R)
- M34: 4,801,194 km (0.115 R)
- M35: 4,953,784 km (0.057 R)
- M36: 5,232,335 km (0.057 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.61 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 422.6
Radius: 12.2
Gravity: 2.84 G
Time & Orbit
Eccentricity (e): 0.09
Orbit Range: 1.47 AU - 1.75 AU
Year: 1386 Days
Day: 9.8 Hours
Environment
Temp: -191 °C
Axial Tilt: 19.5 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 22,638,805 km
- M1: 169,644 km (0.104 R)
- M2: 251,175 km (0.111 R)
- M3: 472,131 km (0.11 R)
- M4: 771,476 km (0.073 R)
- M5: 1,058,106 km (0.087 R)
- M6: 1,240,914 km (0.074 R)
- M7: 1,530,985 km (0.11 R)
- M8: 1,638,246 km (0.096 R)
- M9: 1,756,578 km (0.106 R)
- M10: 1,886,878 km (0.072 R)
- M11: 2,011,343 km (0.109 R)
- M12: 2,111,275 km (0.105 R)
- M13: 2,306,650 km (0.087 R)
- M14: 2,411,518 km (0.07 R)
- M15: 2,527,606 km (0.1 R)
- M16: 3,063,465 km (0.062 R)
- M17: 3,147,539 km (0.036 R)
- M18: 3,339,324 km (0.084 R)
- M19: 3,469,474 km (0.093 R)
- M20: 3,869,947 km (0.118 R)
- M21: 4,215,219 km (0.062 R)
- M22: 4,297,199 km (0.119 R)
- M23: 4,486,739 km (0.073 R)
- M24: 4,582,482 km (0.11 R)
- M25: 4,960,217 km (0.067 R)
- M26: 5,109,216 km (0.092 R)
- M27: 5,488,147 km (0.102 R)
- M28: 5,603,637 km (0.059 R)
- M29: 5,745,905 km (0.12 R)
- M30: 5,941,878 km (0.101 R)
- M31: 6,087,137 km (0.111 R)
- M32: 6,394,411 km (0.12 R)
- M33: 6,693,158 km (0.073 R)
- M34: 6,816,726 km (0.095 R)
- M35: 7,093,931 km (0.106 R)
- M36: 7,248,166 km (0.067 R)
- M37: 7,346,751 km (0.054 R)
- M38: 7,431,723 km (0.095 R)
- M39: 7,702,794 km (0.119 R)
- M40: 7,817,985 km (0.117 R)
- M41: 8,254,811 km (0.061 R)
- M42: 8,461,405 km (0.096 R)
- M43: 8,565,376 km (0.052 R)
- M44: 8,684,755 km (0.043 R)
- M45: 8,834,801 km (0.104 R)
- M46: 9,000,705 km (0.097 R)
- M47: 9,335,805 km (0.078 R)
- M48: 9,504,850 km (0.09 R)
- M49: 9,582,043 km (0.119 R)
- M50: 9,799,259 km (0.071 R)
- M51: 10,365,487 km (0.085 R)
- M52: 10,556,523 km (0.064 R)
- M53: 10,636,558 km (0.081 R)
- M54: 10,910,023 km (0.083 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.67 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 743.9
Radius: 9.2
Gravity: 8.79 G
Time & Orbit
Eccentricity (e): 0.15
Orbit Range: 1.42 AU - 1.92 AU
Year: 1464 Days
Day: 14.3 Hours
Environment
Temp: -193 °C
Axial Tilt: 31.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (70)
Outer Limit: 22,638,805 km
- M1: 117,883 km (0.09 R)
- M2: 376,538 km (0.032 R)
- M3: 486,941 km (0.108 R)
- M4: 582,684 km (0.114 R)
- M5: 643,570 km (0.099 R)
- M6: 707,000 km (0.101 R)
- M7: 832,811 km (0.109 R)
- M8: 1,355,506 km (0.119 R)
- M9: 1,467,256 km (0.073 R)
- M10: 1,670,111 km (0.09 R)
- M11: 1,790,387 km (0.117 R)
- M12: 2,366,489 km (0.119 R)
- M13: 2,840,265 km (0.094 R)
- M14: 2,936,307 km (0.064 R)
- M15: 3,033,246 km (0.095 R)
- M16: 3,267,965 km (0.091 R)
- M17: 3,356,079 km (0.112 R)
- M18: 3,483,087 km (0.057 R)
- M19: 3,742,191 km (0.079 R)
- M20: 3,914,079 km (0.091 R)
- M21: 3,994,263 km (0.113 R)
- M22: 4,074,896 km (0.085 R)
- M23: 4,238,108 km (0.062 R)
- M24: 4,486,739 km (0.112 R)
- M25: 4,641,274 km (0.062 R)
- M26: 4,797,305 km (0.097 R)
- M27: 4,912,046 km (0.062 R)
- M28: 4,998,663 km (0.079 R)
- M29: 5,071,218 km (0.029 R)
- M30: 5,202,715 km (0.064 R)
- M31: 5,276,317 km (0.085 R)
- M32: 5,604,235 km (0.104 R)
- M33: 5,892,660 km (0.079 R)
- M34: 5,969,404 km (0.1 R)
- M35: 6,217,288 km (0.075 R)
- M36: 6,311,085 km (0.078 R)
- M37: 6,421,040 km (0.035 R)
- M38: 6,851,582 km (0.099 R)
- M39: 7,143,747 km (0.045 R)
- M40: 7,390,284 km (0.026 R)
- M41: 7,522,978 km (0.1 R)
- M42: 7,740,343 km (0.101 R)
- M43: 7,841,322 km (0.03 R)
- M44: 8,164,154 km (0.099 R)
- M45: 8,422,061 km (0.084 R)
- M46: 8,665,157 km (0.047 R)
- M47: 8,787,529 km (0.118 R)
- M48: 8,892,995 km (0.111 R)
- M49: 9,211,788 km (0.068 R)
- M50: 9,283,146 km (0.063 R)
- M51: 9,408,509 km (0.052 R)
- M52: 9,534,321 km (0.078 R)
- M53: 9,824,092 km (0.111 R)
- M54: 10,098,455 km (0.083 R)
- M55: 10,264,359 km (0.066 R)
- M56: 10,356,810 km (0.047 R)
- M57: 10,449,710 km (0.113 R)
- M58: 10,673,509 km (0.102 R)
- M59: 10,786,006 km (0.055 R)
- M60: 10,993,349 km (0.089 R)
- M61: 11,164,040 km (0.096 R)
- M62: 11,412,074 km (0.09 R)
- M63: 11,488,668 km (0.102 R)
- M64: 11,546,412 km (0.1 R)
- M65: 11,719,796 km (0.117 R)
- M66: 12,088,854 km (0.094 R)
- M67: 12,206,139 km (0.106 R)
- M68: 13,118,237 km (0.045 R)
- M69: 13,198,571 km (0.105 R)
- M70: 13,319,446 km (0.112 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.13 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 750.1
Radius: 11.4
Gravity: 5.77 G
Time & Orbit
Eccentricity (e): 0.246
Orbit Range: 1.61 AU - 2.65 AU
Year: 2108 Days
Day: 7.3 Hours
Environment
Temp: -209 °C
Axial Tilt: 26.7 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (73)
Outer Limit: 22,638,805 km
- M1: 143,315 km (0.096 R)
- M2: 232,026 km (0.032 R)
- M3: 318,643 km (0.117 R)
- M4: 409,749 km (0.101 R)
- M5: 498,311 km (0.097 R)
- M6: 610,509 km (0.051 R)
- M7: 836,551 km (0.106 R)
- M8: 1,012,478 km (0.073 R)
- M9: 1,160,431 km (0.056 R)
- M10: 1,380,190 km (0.102 R)
- M11: 1,523,206 km (0.079 R)
- M12: 1,896,602 km (0.074 R)
- M13: 2,056,672 km (0.098 R)
- M14: 2,550,344 km (0.116 R)
- M15: 2,980,139 km (0.117 R)
- M16: 3,138,115 km (0.068 R)
- M17: 3,447,633 km (0.075 R)
- M18: 3,537,990 km (0.075 R)
- M19: 3,613,836 km (0.064 R)
- M20: 3,736,356 km (0.039 R)
- M21: 3,922,905 km (0.049 R)
- M22: 4,001,444 km (0.047 R)
- M23: 4,080,581 km (0.099 R)
- M24: 4,369,903 km (0.107 R)
- M25: 4,732,678 km (0.067 R)
- M26: 5,139,584 km (0.089 R)
- M27: 5,452,244 km (0.087 R)
- M28: 5,575,513 km (0.078 R)
- M29: 5,717,631 km (0.062 R)
- M30: 5,807,090 km (0.079 R)
- M31: 5,878,897 km (0.098 R)
- M32: 6,078,012 km (0.046 R)
- M33: 6,242,719 km (0.099 R)
- M34: 6,859,062 km (0.1 R)
- M35: 7,126,394 km (0.117 R)
- M36: 7,300,226 km (0.033 R)
- M37: 7,534,048 km (0.09 R)
- M38: 7,730,769 km (0.057 R)
- M39: 7,889,493 km (0.065 R)
- M40: 8,534,858 km (0.081 R)
- M41: 8,760,751 km (0.104 R)
- M42: 8,926,206 km (0.108 R)
- M43: 9,134,446 km (0.095 R)
- M44: 9,323,388 km (0.11 R)
- M45: 9,407,761 km (0.064 R)
- M46: 9,577,256 km (0.071 R)
- M47: 9,747,797 km (0.04 R)
- M48: 9,983,863 km (0.074 R)
- M49: 10,374,313 km (0.092 R)
- M50: 10,483,669 km (0.103 R)
- M51: 10,814,131 km (0.089 R)
- M52: 11,282,372 km (0.073 R)
- M53: 11,485,227 km (0.078 R)
- M54: 11,711,868 km (0.038 R)
- M55: 12,400,915 km (0.097 R)
- M56: 12,914,635 km (0.115 R)
- M57: 13,126,764 km (0.087 R)
- M58: 13,435,235 km (0.078 R)
- M59: 13,698,228 km (0.083 R)
- M60: 13,938,632 km (0.105 R)
- M61: 14,107,827 km (0.06 R)
- M62: 14,448,312 km (0.057 R)
- M63: 14,521,615 km (0.112 R)
- M64: 14,742,272 km (0.059 R)
- M65: 14,840,707 km (0.086 R)
- M66: 15,162,043 km (0.038 R)
- M67: 15,460,790 km (0.106 R)
- M68: 15,560,871 km (0.093 R)
- M69: 15,661,102 km (0.119 R)
- M70: 15,811,897 km (0.117 R)
- M71: 16,368,700 km (0.097 R)
- M72: 16,957,816 km (0.094 R)
- M73: 17,190,291 km (0.079 R)
Planet 6 - Gas Giant
Semi-Major Axis: 2.28 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 659.9
Radius: 8.3
Gravity: 9.58 G
Time & Orbit
Eccentricity (e): 0.173
Orbit Range: 1.89 AU - 2.67 AU
Year: 2335 Days
Day: 12.2 Hours
Environment
Temp: -205 °C
Axial Tilt: 35.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (76)
Outer Limit: 22,638,805 km
- M1: 113,694 km (0.055 R)
- M2: 173,833 km (0.031 R)
- M3: 235,467 km (0.102 R)
- M4: 365,468 km (0.117 R)
- M5: 492,027 km (0.113 R)
- M6: 659,128 km (0.087 R)
- M7: 763,248 km (0.03 R)
- M8: 845,078 km (0.111 R)
- M9: 939,774 km (0.109 R)
- M10: 1,058,255 km (0.096 R)
- M11: 1,266,944 km (0.093 R)
- M12: 1,343,239 km (0.094 R)
- M13: 1,477,578 km (0.118 R)
- M14: 1,604,736 km (0.114 R)
- M15: 1,857,706 km (0.115 R)
- M16: 2,020,768 km (0.097 R)
- M17: 2,254,440 km (0.069 R)
- M18: 2,747,664 km (0.065 R)
- M19: 3,153,972 km (0.048 R)
- M20: 3,425,342 km (0.039 R)
- M21: 3,532,903 km (0.095 R)
- M22: 3,672,927 km (0.052 R)
- M23: 3,990,523 km (0.113 R)
- M24: 4,218,211 km (0.097 R)
- M25: 4,400,122 km (0.096 R)
- M26: 4,483,598 km (0.073 R)
- M27: 5,419,332 km (0.069 R)
- M28: 5,562,946 km (0.119 R)
- M29: 5,671,554 km (0.063 R)
- M30: 5,762,510 km (0.09 R)
- M31: 6,337,863 km (0.067 R)
- M32: 6,527,404 km (0.107 R)
- M33: 6,699,441 km (0.06 R)
- M34: 7,126,693 km (0.12 R)
- M35: 7,205,232 km (0.08 R)
- M36: 7,946,190 km (0.115 R)
- M37: 8,191,680 km (0.062 R)
- M38: 8,356,687 km (0.085 R)
- M39: 8,418,919 km (0.117 R)
- M40: 8,816,401 km (0.042 R)
- M41: 8,900,774 km (0.106 R)
- M42: 9,327,128 km (0.073 R)
- M43: 9,477,923 km (0.102 R)
- M44: 9,564,540 km (0.115 R)
- M45: 10,001,066 km (0.099 R)
- M46: 10,399,595 km (0.041 R)
- M47: 10,466,615 km (0.068 R)
- M48: 10,645,833 km (0.108 R)
- M49: 10,713,302 km (0.081 R)
- M50: 11,212,360 km (0.064 R)
- M51: 11,303,914 km (0.087 R)
- M52: 11,533,846 km (0.117 R)
- M53: 11,695,711 km (0.112 R)
- M54: 11,998,497 km (0.09 R)
- M55: 12,350,950 km (0.109 R)
- M56: 12,564,127 km (0.036 R)
- M57: 12,683,057 km (0.08 R)
- M58: 12,778,501 km (0.037 R)
- M59: 12,946,050 km (0.069 R)
- M60: 13,066,177 km (0.081 R)
- M61: 13,186,753 km (0.107 R)
- M62: 13,331,863 km (0.032 R)
- M63: 13,501,806 km (0.113 R)
- M64: 13,770,334 km (0.094 R)
- M65: 14,188,760 km (0.056 R)
- M66: 14,263,110 km (0.065 R)
- M67: 14,436,943 km (0.092 R)
- M68: 14,661,489 km (0.076 R)
- M69: 14,736,587 km (0.075 R)
- M70: 14,912,365 km (0.034 R)
- M71: 15,164,587 km (0.111 R)
- M72: 16,525,179 km (0.111 R)
- M73: 16,655,479 km (0.112 R)
- M74: 16,707,689 km (0.119 R)
- M75: 17,286,034 km (0.066 R)
- M76: 17,684,114 km (0.106 R)
Planet 7 - Gas Giant
Semi-Major Axis: 3.21 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 474.3
Radius: 12.6
Gravity: 2.99 G
Time & Orbit
Eccentricity (e): 0.022
Orbit Range: 3.14 AU - 3.28 AU
Year: 3901 Days
Day: 14.9 Hours
Environment
Temp: -205 °C
Axial Tilt: 18.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (70)
Outer Limit: 22,638,805 km
- M1: 235,168 km (0.095 R)
- M2: 364,121 km (0.096 R)
- M3: 618,438 km (0.069 R)
- M4: 713,881 km (0.068 R)
- M5: 825,481 km (0.075 R)
- M6: 921,672 km (0.117 R)
- M7: 1,488,948 km (0.107 R)
- M8: 1,732,493 km (0.087 R)
- M9: 2,077,765 km (0.102 R)
- M10: 2,351,230 km (0.096 R)
- M11: 2,556,179 km (0.093 R)
- M12: 2,783,568 km (0.097 R)
- M13: 3,434,318 km (0.081 R)
- M14: 3,541,430 km (0.068 R)
- M15: 3,667,691 km (0.033 R)
- M16: 3,869,349 km (0.088 R)
- M17: 4,264,587 km (0.079 R)
- M18: 4,633,495 km (0.119 R)
- M19: 4,791,919 km (0.093 R)
- M20: 4,871,954 km (0.03 R)
- M21: 4,972,484 km (0.101 R)
- M22: 5,093,957 km (0.051 R)
- M23: 5,298,906 km (0.117 R)
- M24: 5,780,462 km (0.062 R)
- M25: 6,037,321 km (0.063 R)
- M26: 6,518,129 km (0.091 R)
- M27: 6,606,840 km (0.108 R)
- M28: 6,763,170 km (0.055 R)
- M29: 7,216,601 km (0.081 R)
- M30: 7,308,454 km (0.085 R)
- M31: 7,726,880 km (0.113 R)
- M32: 7,962,646 km (0.04 R)
- M33: 8,200,955 km (0.046 R)
- M34: 8,586,918 km (0.09 R)
- M35: 8,979,014 km (0.086 R)
- M36: 9,402,077 km (0.076 R)
- M37: 9,806,140 km (0.106 R)
- M38: 9,908,166 km (0.063 R)
- M39: 10,371,172 km (0.059 R)
- M40: 11,158,804 km (0.077 R)
- M41: 11,318,575 km (0.077 R)
- M42: 11,479,243 km (0.089 R)
- M43: 12,156,622 km (0.05 R)
- M44: 12,376,082 km (0.064 R)
- M45: 12,763,391 km (0.098 R)
- M46: 13,014,416 km (0.037 R)
- M47: 13,408,308 km (0.098 R)
- M48: 13,663,671 km (0.106 R)
- M49: 14,035,272 km (0.096 R)
- M50: 14,179,036 km (0.101 R)
- M51: 14,817,669 km (0.098 R)
- M52: 15,942,944 km (0.059 R)
- M53: 16,213,417 km (0.111 R)
- M54: 16,515,755 km (0.045 R)
- M55: 16,728,632 km (0.074 R)
- M56: 16,820,037 km (0.112 R)
- M57: 16,911,740 km (0.059 R)
- M58: 17,218,416 km (0.096 R)
- M59: 17,310,718 km (0.113 R)
- M60: 17,465,103 km (0.051 R)
- M61: 17,775,069 km (0.106 R)
- M62: 18,526,500 km (0.094 R)
- M63: 18,621,195 km (0.063 R)
- M64: 19,033,187 km (0.094 R)
- M65: 19,448,322 km (0.104 R)
- M66: 20,777,050 km (0.058 R)
- M67: 21,934,339 km (0.076 R)
- M68: 22,034,570 km (0.037 R)
- M69: 22,268,840 km (0.064 R)
- M70: 22,571,327 km (0.114 R)
Kuiper Belt
Range: 30 - 52 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 166 - 14,137 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.