Star System Generated (Seed: 1767242156)
Star Details
Spectral Class: M8V
Temperature: 2,617 K
Mass: 0.28 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: 10.6 AU
Planetary System (6 Planets)
Asteroid Belt
Center: 0.53 AU
Composition
Type: Main (Rocky/Icy Mix)
A dense region of planetesimals and debris.
Boundary
Planet 1 - Gas Giant
Semi-Major Axis: 1.05 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 772.9
Radius: 9.2
Gravity: 9.13 G
Time & Orbit
Eccentricity (e): 0.11
Orbit Range: 0.93 AU - 1.17 AU
Year: 743 Days
Day: 8.1 Hours
Environment
Temp: -168 °C
Axial Tilt: 39.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (61)
Outer Limit: 46,636,870 km
- M1: 114,742 km (0.043 R)
- M2: 272,119 km (0.028 R)
- M3: 357,240 km (0.065 R)
- M4: 419,024 km (0.097 R)
- M5: 494,421 km (0.103 R)
- M6: 555,756 km (0.055 R)
- M7: 635,193 km (0.097 R)
- M8: 697,724 km (0.097 R)
- M9: 762,500 km (0.092 R)
- M10: 835,205 km (0.047 R)
- M11: 957,875 km (0.066 R)
- M12: 1,018,462 km (0.119 R)
- M13: 1,417,589 km (0.044 R)
- M14: 1,508,695 km (0.113 R)
- M15: 1,573,022 km (0.112 R)
- M16: 1,645,577 km (0.041 R)
- M17: 1,832,125 km (0.1 R)
- M18: 1,924,128 km (0.098 R)
- M19: 2,025,555 km (0.101 R)
- M20: 2,096,913 km (0.068 R)
- M21: 2,242,023 km (0.055 R)
- M22: 2,525,511 km (0.103 R)
- M23: 2,602,554 km (0.062 R)
- M24: 2,671,668 km (0.083 R)
- M25: 2,758,884 km (0.108 R)
- M26: 2,855,973 km (0.077 R)
- M27: 2,945,283 km (0.085 R)
- M28: 3,026,515 km (0.072 R)
- M29: 3,387,045 km (0.116 R)
- M30: 3,491,166 km (0.091 R)
- M31: 3,548,461 km (0.102 R)
- M32: 3,673,675 km (0.064 R)
- M33: 3,761,190 km (0.118 R)
- M34: 4,018,199 km (0.119 R)
- M35: 4,189,189 km (0.054 R)
- M36: 4,570,065 km (0.102 R)
- M37: 4,972,633 km (0.115 R)
- M38: 5,102,185 km (0.116 R)
- M39: 5,189,251 km (0.083 R)
- M40: 5,386,720 km (0.084 R)
- M41: 5,553,372 km (0.087 R)
- M42: 5,654,052 km (0.04 R)
- M43: 5,925,721 km (0.075 R)
- M44: 6,097,759 km (0.049 R)
- M45: 6,341,304 km (0.08 R)
- M46: 6,517,231 km (0.064 R)
- M47: 6,576,322 km (0.044 R)
- M48: 6,778,280 km (0.119 R)
- M49: 6,874,022 km (0.035 R)
- M50: 6,934,161 km (0.07 R)
- M51: 6,994,299 km (0.115 R)
- M52: 7,139,708 km (0.105 R)
- M53: 7,200,594 km (0.088 R)
- M54: 7,656,269 km (0.118 R)
- M55: 7,793,600 km (0.119 R)
- M56: 8,108,803 km (0.107 R)
- M57: 8,235,961 km (0.11 R)
- M58: 8,492,522 km (0.073 R)
- M59: 8,621,624 km (0.078 R)
- M60: 8,738,460 km (0.101 R)
- M61: 8,816,700 km (0.093 R)
Planet 2 - Gas Giant
Semi-Major Axis: 1.68 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 707.4
Radius: 13.1
Gravity: 4.12 G
Time & Orbit
Eccentricity (e): 0.143
Orbit Range: 1.44 AU - 1.92 AU
Year: 1503 Days
Day: 8.2 Hours
Environment
Temp: -196 °C
Axial Tilt: 1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (60)
Outer Limit: 46,636,870 km
- M1: 167,699 km (0.077 R)
- M2: 259,253 km (0.062 R)
- M3: 342,280 km (0.101 R)
- M4: 546,780 km (0.117 R)
- M5: 690,693 km (0.113 R)
- M6: 782,696 km (0.112 R)
- M7: 964,906 km (0.096 R)
- M8: 1,069,924 km (0.119 R)
- M9: 1,187,807 km (0.07 R)
- M10: 1,355,207 km (0.047 R)
- M11: 1,446,761 km (0.041 R)
- M12: 1,784,104 km (0.113 R)
- M13: 1,946,717 km (0.067 R)
- M14: 2,040,515 km (0.113 R)
- M15: 2,331,333 km (0.056 R)
- M16: 2,442,484 km (0.1 R)
- M17: 2,647,284 km (0.098 R)
- M18: 2,857,768 km (0.079 R)
- M19: 3,013,350 km (0.098 R)
- M20: 3,110,589 km (0.108 R)
- M21: 3,295,641 km (0.115 R)
- M22: 3,484,434 km (0.11 R)
- M23: 3,767,922 km (0.084 R)
- M24: 3,872,939 km (0.1 R)
- M25: 4,126,358 km (0.116 R)
- M26: 4,344,023 km (0.098 R)
- M27: 4,440,364 km (0.079 R)
- M28: 4,691,688 km (0.067 R)
- M29: 4,904,716 km (0.115 R)
- M30: 5,281,702 km (0.119 R)
- M31: 5,414,396 km (0.115 R)
- M32: 5,713,292 km (0.053 R)
- M33: 5,864,835 km (0.109 R)
- M34: 6,079,209 km (0.099 R)
- M35: 6,280,567 km (0.109 R)
- M36: 7,568,306 km (0.056 R)
- M37: 7,835,637 km (0.105 R)
- M38: 8,004,234 km (0.06 R)
- M39: 8,140,069 km (0.087 R)
- M40: 8,345,168 km (0.06 R)
- M41: 8,534,708 km (0.098 R)
- M42: 8,673,385 km (0.058 R)
- M43: 8,777,954 km (0.102 R)
- M44: 8,918,127 km (0.071 R)
- M45: 9,342,836 km (0.071 R)
- M46: 9,521,755 km (0.076 R)
- M47: 9,683,769 km (0.106 R)
- M48: 9,846,681 km (0.118 R)
- M49: 10,396,454 km (0.089 R)
- M50: 11,069,494 km (0.1 R)
- M51: 11,239,886 km (0.105 R)
- M52: 11,411,326 km (0.081 R)
- M53: 11,526,067 km (0.101 R)
- M54: 11,795,194 km (0.066 R)
- M55: 12,536,302 km (0.054 R)
- M56: 12,674,530 km (0.058 R)
- M57: 12,932,437 km (0.109 R)
- M58: 13,052,115 km (0.087 R)
- M59: 13,352,807 km (0.118 R)
- M60: 13,514,223 km (0.082 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.74 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 370.6
Radius: 8.5
Gravity: 5.13 G
Time & Orbit
Eccentricity (e): 0.152
Orbit Range: 1.48 AU - 2 AU
Year: 1584 Days
Day: 9.5 Hours
Environment
Temp: -202 °C
Axial Tilt: 44 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (68)
Outer Limit: 46,636,870 km
- M1: 118,781 km (0.101 R)
- M2: 221,106 km (0.047 R)
- M3: 280,646 km (0.112 R)
- M4: 357,240 km (0.103 R)
- M5: 469,438 km (0.115 R)
- M6: 547,528 km (0.062 R)
- M7: 750,832 km (0.082 R)
- M8: 803,789 km (0.105 R)
- M9: 1,021,903 km (0.061 R)
- M10: 1,134,401 km (0.071 R)
- M11: 1,290,880 km (0.091 R)
- M12: 1,355,506 km (0.105 R)
- M13: 1,421,180 km (0.113 R)
- M14: 1,504,955 km (0.113 R)
- M15: 1,668,914 km (0.116 R)
- M16: 1,865,934 km (0.037 R)
- M17: 2,421,690 km (0.114 R)
- M18: 2,492,001 km (0.11 R)
- M19: 2,563,210 km (0.107 R)
- M20: 2,635,017 km (0.059 R)
- M21: 2,717,894 km (0.101 R)
- M22: 2,812,290 km (0.068 R)
- M23: 2,907,734 km (0.095 R)
- M24: 3,015,145 km (0.049 R)
- M25: 3,167,585 km (0.041 R)
- M26: 3,267,068 km (0.111 R)
- M27: 3,345,158 km (0.115 R)
- M28: 3,469,025 km (0.116 R)
- M29: 3,606,057 km (0.12 R)
- M30: 3,675,171 km (0.072 R)
- M31: 3,768,071 km (0.082 R)
- M32: 4,293,010 km (0.105 R)
- M33: 4,354,196 km (0.09 R)
- M34: 4,564,231 km (0.104 R)
- M35: 4,664,162 km (0.052 R)
- M36: 4,802,989 km (0.111 R)
- M37: 4,955,878 km (0.072 R)
- M38: 5,058,652 km (0.069 R)
- M39: 5,123,278 km (0.072 R)
- M40: 5,424,120 km (0.101 R)
- M41: 5,530,184 km (0.088 R)
- M42: 5,703,868 km (0.118 R)
- M43: 5,933,800 km (0.113 R)
- M44: 6,125,584 km (0.116 R)
- M45: 6,222,224 km (0.099 R)
- M46: 6,305,401 km (0.06 R)
- M47: 6,402,938 km (0.113 R)
- M48: 6,458,888 km (0.091 R)
- M49: 6,613,722 km (0.101 R)
- M50: 6,684,482 km (0.11 R)
- M51: 6,798,176 km (0.084 R)
- M52: 6,955,703 km (0.057 R)
- M53: 7,042,021 km (0.094 R)
- M54: 7,259,685 km (0.109 R)
- M55: 7,746,178 km (0.083 R)
- M56: 8,197,515 km (0.036 R)
- M57: 8,626,711 km (0.039 R)
- M58: 8,875,043 km (0.12 R)
- M59: 9,125,919 km (0.039 R)
- M60: 9,410,903 km (0.118 R)
- M61: 9,747,199 km (0.066 R)
- M62: 9,843,989 km (0.111 R)
- M63: 9,924,921 km (0.075 R)
- M64: 10,006,003 km (0.103 R)
- M65: 10,729,458 km (0.044 R)
- M66: 10,929,620 km (0.082 R)
- M67: 11,181,693 km (0.117 R)
- M68: 11,367,793 km (0.076 R)
Planet 4 - Gas Giant
Semi-Major Axis: 1.8 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 868.6
Radius: 12.3
Gravity: 5.74 G
Time & Orbit
Eccentricity (e): 0.103
Orbit Range: 1.61 AU - 1.99 AU
Year: 1667 Days
Day: 14.3 Hours
Environment
Temp: -202 °C
Axial Tilt: 40 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (62)
Outer Limit: 46,636,870 km
- M1: 176,077 km (0.11 R)
- M2: 272,867 km (0.084 R)
- M3: 393,143 km (0.118 R)
- M4: 472,580 km (0.066 R)
- M5: 630,405 km (0.107 R)
- M6: 840,740 km (0.101 R)
- M7: 1,195,885 km (0.081 R)
- M8: 1,272,629 km (0.049 R)
- M9: 1,361,191 km (0.086 R)
- M10: 1,555,219 km (0.102 R)
- M11: 1,813,725 km (0.118 R)
- M12: 2,239,779 km (0.092 R)
- M13: 2,384,889 km (0.11 R)
- M14: 2,558,124 km (0.064 R)
- M15: 2,864,799 km (0.095 R)
- M16: 3,022,775 km (0.09 R)
- M17: 3,102,959 km (0.106 R)
- M18: 3,320,026 km (0.106 R)
- M19: 3,612,639 km (0.082 R)
- M20: 3,870,247 km (0.116 R)
- M21: 4,060,236 km (0.061 R)
- M22: 4,208,338 km (0.095 R)
- M23: 4,586,671 km (0.088 R)
- M24: 4,756,763 km (0.06 R)
- M25: 4,992,081 km (0.089 R)
- M26: 5,150,954 km (0.094 R)
- M27: 5,539,460 km (0.091 R)
- M28: 5,887,275 km (0.095 R)
- M29: 5,971,199 km (0.102 R)
- M30: 6,327,840 km (0.113 R)
- M31: 6,500,177 km (0.061 R)
- M32: 6,604,297 km (0.08 R)
- M33: 6,691,513 km (0.09 R)
- M34: 7,115,623 km (0.085 R)
- M35: 7,403,150 km (0.098 R)
- M36: 7,989,873 km (0.042 R)
- M37: 8,101,622 km (0.1 R)
- M38: 8,572,556 km (0.116 R)
- M39: 8,763,593 km (0.082 R)
- M40: 9,266,541 km (0.056 R)
- M41: 9,462,514 km (0.115 R)
- M42: 9,600,593 km (0.03 R)
- M43: 9,898,592 km (0.055 R)
- M44: 9,998,523 km (0.117 R)
- M45: 10,078,857 km (0.102 R)
- M46: 10,401,989 km (0.081 R)
- M47: 10,564,901 km (0.097 R)
- M48: 10,955,202 km (0.079 R)
- M49: 11,058,723 km (0.104 R)
- M50: 11,141,750 km (0.07 R)
- M51: 11,308,552 km (0.113 R)
- M52: 11,476,101 km (0.064 R)
- M53: 11,581,119 km (0.108 R)
- M54: 11,877,323 km (0.092 R)
- M55: 12,026,322 km (0.065 R)
- M56: 12,455,369 km (0.114 R)
- M57: 12,845,969 km (0.1 R)
- M58: 13,196,477 km (0.113 R)
- M59: 13,505,845 km (0.073 R)
- M60: 13,750,587 km (0.098 R)
- M61: 14,493,491 km (0.052 R)
- M62: 14,698,440 km (0.099 R)
Planet 5 - Gas Giant
Semi-Major Axis: 5.11 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 216.5
Radius: 8.8
Gravity: 2.8 G
Time & Orbit
Eccentricity (e): 0.199
Orbit Range: 4.09 AU - 6.13 AU
Year: 7973 Days
Day: 12.7 Hours
Environment
Temp: -222 °C
Axial Tilt: 1.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (86)
Outer Limit: 46,636,870 km
- M1: 155,731 km (0.08 R)
- M2: 562,189 km (0.026 R)
- M3: 638,484 km (0.075 R)
- M4: 839,543 km (0.099 R)
- M5: 1,060,948 km (0.109 R)
- M6: 1,171,651 km (0.076 R)
- M7: 1,228,647 km (0.106 R)
- M8: 1,527,544 km (0.04 R)
- M9: 1,701,676 km (0.104 R)
- M10: 1,799,513 km (0.112 R)
- M11: 1,949,859 km (0.092 R)
- M12: 2,280,769 km (0.074 R)
- M13: 2,462,231 km (0.119 R)
- M14: 2,724,177 km (0.114 R)
- M15: 2,839,218 km (0.061 R)
- M16: 2,955,904 km (0.03 R)
- M17: 3,710,476 km (0.12 R)
- M18: 3,838,382 km (0.095 R)
- M19: 3,945,943 km (0.082 R)
- M20: 4,076,542 km (0.104 R)
- M21: 4,297,348 km (0.051 R)
- M22: 4,386,808 km (0.056 R)
- M23: 5,171,748 km (0.077 R)
- M24: 5,314,764 km (0.044 R)
- M25: 5,410,805 km (0.075 R)
- M26: 5,875,307 km (0.108 R)
- M27: 6,250,947 km (0.06 R)
- M28: 6,352,374 km (0.092 R)
- M29: 6,480,131 km (0.102 R)
- M30: 6,557,174 km (0.11 R)
- M31: 7,104,702 km (0.108 R)
- M32: 7,263,874 km (0.111 R)
- M33: 7,424,243 km (0.093 R)
- M34: 7,504,876 km (0.115 R)
- M35: 8,022,335 km (0.096 R)
- M36: 8,243,740 km (0.045 R)
- M37: 8,410,991 km (0.061 R)
- M38: 8,834,353 km (0.061 R)
- M39: 9,091,661 km (0.067 R)
- M40: 9,409,407 km (0.117 R)
- M41: 10,294,877 km (0.105 R)
- M42: 10,565,649 km (0.059 R)
- M43: 11,206,676 km (0.077 R)
- M44: 12,271,065 km (0.044 R)
- M45: 12,462,251 km (0.108 R)
- M46: 12,686,498 km (0.099 R)
- M47: 13,662,923 km (0.079 R)
- M48: 13,860,991 km (0.083 R)
- M49: 14,394,158 km (0.091 R)
- M50: 14,730,753 km (0.103 R)
- M51: 15,172,366 km (0.105 R)
- M52: 15,343,356 km (0.092 R)
- M53: 15,790,803 km (0.075 R)
- M54: 16,417,618 km (0.066 R)
- M55: 16,522,786 km (0.052 R)
- M56: 17,087,966 km (0.078 R)
- M57: 17,159,025 km (0.107 R)
- M58: 17,731,387 km (0.066 R)
- M59: 18,419,088 km (0.118 R)
- M60: 18,637,950 km (0.103 R)
- M61: 19,448,322 km (0.055 R)
- M62: 20,989,030 km (0.083 R)
- M63: 21,639,182 km (0.083 R)
- M64: 21,986,249 km (0.095 R)
- M65: 22,140,934 km (0.114 R)
- M66: 22,334,962 km (0.102 R)
- M67: 22,841,949 km (0.102 R)
- M68: 22,920,339 km (0.056 R)
- M69: 23,038,072 km (0.086 R)
- M70: 23,155,955 km (0.1 R)
- M71: 23,234,644 km (0.12 R)
- M72: 23,313,482 km (0.118 R)
- M73: 23,510,801 km (0.06 R)
- M74: 23,788,006 km (0.118 R)
- M75: 24,026,615 km (0.083 R)
- M76: 24,185,937 km (0.116 R)
- M77: 24,345,857 km (0.041 R)
- M78: 25,636,737 km (0.113 R)
- M79: 25,799,798 km (0.032 R)
- M80: 26,208,649 km (0.082 R)
- M81: 26,413,898 km (0.033 R)
- M82: 26,578,455 km (0.075 R)
- M83: 26,867,179 km (0.108 R)
- M84: 27,489,656 km (0.113 R)
- M85: 27,781,671 km (0.091 R)
- M86: 27,907,184 km (0.065 R)
Planet 6 - Ice Giant
Semi-Major Axis: 6.1 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 583.4
Radius: 8
Gravity: 9.12 G
Time & Orbit
Eccentricity (e): 0.192
Orbit Range: 4.93 AU - 7.27 AU
Year: 10399 Days
Day: 24.5 Hours
Environment
Temp: -227 °C
Axial Tilt: 27.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (87)
Outer Limit: 46,636,870 km
- M1: 251,324 km (0.099 R)
- M2: 365,916 km (0.051 R)
- M3: 471,832 km (0.114 R)
- M4: 853,007 km (0.055 R)
- M5: 906,563 km (0.113 R)
- M6: 1,728,304 km (0.081 R)
- M7: 2,205,671 km (0.102 R)
- M8: 2,280,769 km (0.12 R)
- M9: 3,022,176 km (0.032 R)
- M10: 3,247,022 km (0.037 R)
- M11: 3,564,917 km (0.093 R)
- M12: 3,712,870 km (0.079 R)
- M13: 3,772,559 km (0.028 R)
- M14: 3,862,767 km (0.063 R)
- M15: 4,137,728 km (0.041 R)
- M16: 4,199,661 km (0.116 R)
- M17: 4,261,894 km (0.035 R)
- M18: 4,674,335 km (0.1 R)
- M19: 4,836,350 km (0.039 R)
- M20: 5,033,220 km (0.112 R)
- M21: 5,434,891 km (0.1 R)
- M22: 5,605,432 km (0.067 R)
- M23: 7,217,349 km (0.11 R)
- M24: 7,404,795 km (0.095 R)
- M25: 7,708,180 km (0.106 R)
- M26: 7,899,815 km (0.09 R)
- M27: 7,976,858 km (0.116 R)
- M28: 8,921,568 km (0.056 R)
- M29: 9,001,902 km (0.077 R)
- M30: 9,122,927 km (0.069 R)
- M31: 10,109,675 km (0.115 R)
- M32: 11,784,423 km (0.087 R)
- M33: 13,543,394 km (0.073 R)
- M34: 14,241,418 km (0.091 R)
- M35: 14,335,366 km (0.097 R)
- M36: 14,808,394 km (0.12 R)
- M37: 14,998,982 km (0.09 R)
- M38: 15,866,799 km (0.108 R)
- M39: 16,602,372 km (0.107 R)
- M40: 17,198,818 km (0.105 R)
- M41: 17,903,574 km (0.112 R)
- M42: 18,055,715 km (0.087 R)
- M43: 18,106,578 km (0.117 R)
- M44: 20,179,107 km (0.09 R)
- M45: 20,390,489 km (0.083 R)
- M46: 20,602,619 km (0.098 R)
- M47: 22,053,419 km (0.12 R)
- M48: 22,107,723 km (0.094 R)
- M49: 22,653,755 km (0.077 R)
- M50: 22,928,566 km (0.099 R)
- M51: 23,647,983 km (0.092 R)
- M52: 24,599,874 km (0.065 R)
- M53: 24,938,863 km (0.036 R)
- M54: 26,656,845 km (0.096 R)
- M55: 26,830,677 km (0.069 R)
- M56: 26,888,721 km (0.116 R)
- M57: 28,353,584 km (0.057 R)
- M58: 29,483,945 km (0.105 R)
- M59: 30,629,117 km (0.095 R)
- M60: 31,176,645 km (0.073 R)
- M61: 31,298,867 km (0.037 R)
- M62: 32,900,761 km (0.098 R)
- M63: 33,899,625 km (0.093 R)
- M64: 34,088,119 km (0.06 R)
- M65: 34,908,514 km (0.101 R)
- M66: 35,416,697 km (0.082 R)
- M67: 35,927,275 km (0.068 R)
- M68: 36,055,331 km (0.103 R)
- M69: 37,603,519 km (0.11 R)
- M70: 37,993,970 km (0.106 R)
- M71: 38,582,188 km (0.061 R)
- M72: 38,844,583 km (0.084 R)
- M73: 38,976,080 km (0.108 R)
- M74: 40,231,804 km (0.098 R)
- M75: 40,497,939 km (0.055 R)
- M76: 41,031,704 km (0.096 R)
- M77: 41,165,594 km (0.077 R)
- M78: 41,366,654 km (0.097 R)
- M79: 41,836,989 km (0.059 R)
- M80: 42,444,357 km (0.04 R)
- M81: 42,783,046 km (0.077 R)
- M82: 44,078,115 km (0.118 R)
- M83: 44,146,631 km (0.066 R)
- M84: 44,696,104 km (0.066 R)
- M85: 44,833,734 km (0.046 R)
- M86: 46,010,022 km (0.097 R)
- M87: 46,149,148 km (0.038 R)
Kuiper Belt
Range: 30 - 54 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 368 - 12,305 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.