Star System Generated (Seed: 1766935048)
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 (6 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.73 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 886.7
Radius: 9.3
Gravity: 10.25 G
Time & Orbit
Eccentricity (e): 0.208
Orbit Range: 0.58 AU - 0.88 AU
Year: 403 Days
Day: 14.2 Hours
Environment
Temp: -142 °C
Axial Tilt: 13.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (47)
Outer Limit: 57,405,526 km
- M1: 146,905 km (0.034 R)
- M2: 239,357 km (0.037 R)
- M3: 326,423 km (0.113 R)
- M4: 388,206 km (0.065 R)
- M5: 448,195 km (0.113 R)
- M6: 571,763 km (0.095 R)
- M7: 686,953 km (0.112 R)
- M8: 745,596 km (0.095 R)
- M9: 841,488 km (0.08 R)
- M10: 918,681 km (0.091 R)
- M11: 1,003,054 km (0.065 R)
- M12: 1,105,229 km (0.098 R)
- M13: 1,205,759 km (0.046 R)
- M14: 1,309,580 km (0.055 R)
- M15: 1,367,923 km (0.111 R)
- M16: 1,449,005 km (0.106 R)
- M17: 1,593,666 km (0.077 R)
- M18: 1,690,755 km (0.068 R)
- M19: 1,772,286 km (0.087 R)
- M20: 1,891,216 km (0.038 R)
- M21: 2,000,572 km (0.052 R)
- M22: 2,137,006 km (0.107 R)
- M23: 2,334,774 km (0.065 R)
- M24: 2,673,164 km (0.11 R)
- M25: 2,830,841 km (0.066 R)
- M26: 2,956,503 km (0.059 R)
- M27: 3,069,748 km (0.099 R)
- M28: 3,177,160 km (0.045 R)
- M29: 3,351,890 km (0.118 R)
- M30: 3,492,362 km (0.045 R)
- M31: 3,718,255 km (0.107 R)
- M32: 3,794,700 km (0.069 R)
- M33: 3,925,747 km (0.084 R)
- M34: 4,319,938 km (0.069 R)
- M35: 4,384,265 km (0.049 R)
- M36: 4,456,969 km (0.1 R)
- M37: 4,546,279 km (0.071 R)
- M38: 4,636,337 km (0.111 R)
- M39: 4,784,888 km (0.102 R)
- M40: 4,876,442 km (0.03 R)
- M41: 5,129,262 km (0.117 R)
- M42: 5,308,780 km (0.079 R)
- M43: 5,369,068 km (0.089 R)
- M44: 5,438,182 km (0.083 R)
- M45: 5,753,385 km (0.108 R)
- M46: 5,859,749 km (0.104 R)
- M47: 5,975,687 km (0.097 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.92 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 619.8
Radius: 12
Gravity: 4.3 G
Time & Orbit
Eccentricity (e): 0.035
Orbit Range: 0.89 AU - 0.95 AU
Year: 570 Days
Day: 13.5 Hours
Environment
Temp: -148 °C
Axial Tilt: 33.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (48)
Outer Limit: 57,405,526 km
- M1: 153,188 km (0.095 R)
- M2: 228,885 km (0.094 R)
- M3: 324,478 km (0.112 R)
- M4: 404,363 km (0.075 R)
- M5: 493,523 km (0.052 R)
- M6: 582,983 km (0.05 R)
- M7: 657,782 km (0.104 R)
- M8: 861,235 km (0.109 R)
- M9: 988,692 km (0.047 R)
- M10: 1,070,522 km (0.062 R)
- M11: 1,160,281 km (0.112 R)
- M12: 1,252,733 km (0.102 R)
- M13: 1,359,097 km (0.057 R)
- M14: 1,433,896 km (0.046 R)
- M15: 1,685,220 km (0.053 R)
- M16: 1,828,984 km (0.102 R)
- M17: 1,931,608 km (0.046 R)
- M18: 2,102,598 km (0.111 R)
- M19: 2,292,438 km (0.097 R)
- M20: 2,431,564 km (0.105 R)
- M21: 2,623,947 km (0.059 R)
- M22: 2,843,706 km (0.086 R)
- M23: 3,023,971 km (0.049 R)
- M24: 3,192,568 km (0.09 R)
- M25: 3,293,696 km (0.117 R)
- M26: 3,427,586 km (0.116 R)
- M27: 3,531,258 km (0.084 R)
- M28: 3,644,055 km (0.102 R)
- M29: 3,766,276 km (0.104 R)
- M30: 4,031,812 km (0.074 R)
- M31: 4,175,277 km (0.117 R)
- M32: 4,269,074 km (0.077 R)
- M33: 4,493,621 km (0.111 R)
- M34: 4,616,141 km (0.044 R)
- M35: 4,873,599 km (0.075 R)
- M36: 4,981,459 km (0.103 R)
- M37: 5,117,444 km (0.062 R)
- M38: 5,208,848 km (0.066 R)
- M39: 5,402,578 km (0.1 R)
- M40: 5,551,727 km (0.107 R)
- M41: 5,673,948 km (0.077 R)
- M42: 5,978,829 km (0.063 R)
- M43: 6,065,446 km (0.117 R)
- M44: 6,220,728 km (0.078 R)
- M45: 6,318,266 km (0.111 R)
- M46: 6,525,160 km (0.091 R)
- M47: 6,654,263 km (0.084 R)
- M48: 6,764,217 km (0.063 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.6 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 775.7
Radius: 12.8
Gravity: 4.73 G
Time & Orbit
Eccentricity (e): 0.103
Orbit Range: 1.44 AU - 1.76 AU
Year: 1307 Days
Day: 13.1 Hours
Environment
Temp: -188 °C
Axial Tilt: 19.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (64)
Outer Limit: 57,405,526 km
- M1: 182,509 km (0.112 R)
- M2: 276,457 km (0.117 R)
- M3: 468,541 km (0.096 R)
- M4: 579,243 km (0.08 R)
- M5: 782,397 km (0.07 R)
- M6: 1,089,372 km (0.098 R)
- M7: 1,236,576 km (0.089 R)
- M8: 1,443,619 km (0.079 R)
- M9: 1,569,880 km (0.053 R)
- M10: 1,681,181 km (0.056 R)
- M11: 1,892,563 km (0.109 R)
- M12: 2,082,253 km (0.081 R)
- M13: 2,288,997 km (0.042 R)
- M14: 2,373,520 km (0.068 R)
- M15: 2,546,156 km (0.11 R)
- M16: 2,645,040 km (0.114 R)
- M17: 2,869,586 km (0.086 R)
- M18: 3,218,299 km (0.092 R)
- M19: 3,519,440 km (0.116 R)
- M20: 3,605,458 km (0.118 R)
- M21: 3,729,475 km (0.1 R)
- M22: 3,829,855 km (0.048 R)
- M23: 4,071,904 km (0.055 R)
- M24: 4,240,352 km (0.032 R)
- M25: 4,345,220 km (0.07 R)
- M26: 4,450,985 km (0.078 R)
- M27: 4,570,963 km (0.026 R)
- M28: 4,841,585 km (0.089 R)
- M29: 5,299,654 km (0.102 R)
- M30: 5,498,320 km (0.101 R)
- M31: 5,699,380 km (0.05 R)
- M32: 5,800,807 km (0.052 R)
- M33: 6,183,179 km (0.091 R)
- M34: 6,482,824 km (0.085 R)
- M35: 6,588,739 km (0.061 R)
- M36: 7,049,800 km (0.084 R)
- M37: 7,190,122 km (0.093 R)
- M38: 7,426,188 km (0.08 R)
- M39: 7,584,911 km (0.099 R)
- M40: 7,664,797 km (0.103 R)
- M41: 7,905,948 km (0.108 R)
- M42: 8,182,256 km (0.089 R)
- M43: 8,428,793 km (0.036 R)
- M44: 8,561,337 km (0.099 R)
- M45: 8,727,839 km (0.099 R)
- M46: 8,979,762 km (0.11 R)
- M47: 9,285,241 km (0.074 R)
- M48: 9,490,938 km (0.111 R)
- M49: 9,576,956 km (0.062 R)
- M50: 10,099,203 km (0.09 R)
- M51: 10,187,166 km (0.098 R)
- M52: 10,381,494 km (0.106 R)
- M53: 10,505,810 km (0.119 R)
- M54: 10,755,937 km (0.078 R)
- M55: 10,990,058 km (0.102 R)
- M56: 11,116,767 km (0.116 R)
- M57: 11,207,723 km (0.089 R)
- M58: 11,298,678 km (0.094 R)
- M59: 11,463,236 km (0.1 R)
- M60: 11,720,844 km (0.091 R)
- M61: 11,924,596 km (0.113 R)
- M62: 12,110,995 km (0.056 R)
- M63: 12,335,691 km (0.118 R)
- M64: 12,580,882 km (0.096 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.74 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 825.1
Radius: 8
Gravity: 12.89 G
Time & Orbit
Eccentricity (e): 0.091
Orbit Range: 2.49 AU - 2.99 AU
Year: 2928 Days
Day: 5.7 Hours
Environment
Temp: -201 °C
Axial Tilt: 9.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (80)
Outer Limit: 57,405,526 km
- M1: 121,922 km (0.105 R)
- M2: 188,045 km (0.074 R)
- M3: 278,551 km (0.102 R)
- M4: 523,144 km (0.102 R)
- M5: 683,961 km (0.088 R)
- M6: 883,226 km (0.073 R)
- M7: 938,727 km (0.07 R)
- M8: 1,018,612 km (0.029 R)
- M9: 1,210,097 km (0.091 R)
- M10: 1,348,625 km (0.036 R)
- M11: 1,586,635 km (0.055 R)
- M12: 1,655,151 km (0.088 R)
- M13: 1,766,900 km (0.097 R)
- M14: 1,910,215 km (0.115 R)
- M15: 2,285,107 km (0.101 R)
- M16: 2,347,340 km (0.062 R)
- M17: 2,601,657 km (0.102 R)
- M18: 2,666,582 km (0.086 R)
- M19: 3,016,791 km (0.084 R)
- M20: 3,119,564 km (0.1 R)
- M21: 3,171,325 km (0.119 R)
- M22: 3,632,535 km (0.06 R)
- M23: 3,742,041 km (0.114 R)
- M24: 4,001,593 km (0.101 R)
- M25: 4,915,786 km (0.083 R)
- M26: 5,220,816 km (0.108 R)
- M27: 5,282,600 km (0.118 R)
- M28: 5,870,520 km (0.068 R)
- M29: 6,413,111 km (0.12 R)
- M30: 6,545,655 km (0.077 R)
- M31: 7,107,993 km (0.098 R)
- M32: 7,245,324 km (0.081 R)
- M33: 7,499,192 km (0.084 R)
- M34: 7,615,579 km (0.108 R)
- M35: 7,850,298 km (0.113 R)
- M36: 8,015,903 km (0.045 R)
- M37: 8,087,261 km (0.092 R)
- M38: 8,278,597 km (0.115 R)
- M39: 8,812,362 km (0.119 R)
- M40: 9,382,479 km (0.117 R)
- M41: 9,608,821 km (0.087 R)
- M42: 10,041,159 km (0.104 R)
- M43: 10,272,587 km (0.062 R)
- M44: 11,322,764 km (0.079 R)
- M45: 11,402,798 km (0.054 R)
- M46: 11,510,060 km (0.079 R)
- M47: 11,779,336 km (0.11 R)
- M48: 11,941,949 km (0.063 R)
- M49: 12,077,934 km (0.109 R)
- M50: 12,187,140 km (0.089 R)
- M51: 12,324,172 km (0.12 R)
- M52: 12,682,758 km (0.115 R)
- M53: 12,961,010 km (0.12 R)
- M54: 13,128,859 km (0.081 R)
- M55: 13,950,450 km (0.108 R)
- M56: 14,151,211 km (0.102 R)
- M57: 14,497,679 km (0.081 R)
- M58: 14,613,767 km (0.1 R)
- M59: 15,228,465 km (0.047 R)
- M60: 15,613,231 km (0.104 R)
- M61: 15,732,310 km (0.083 R)
- M62: 16,181,254 km (0.1 R)
- M63: 16,604,316 km (0.062 R)
- M64: 16,908,599 km (0.051 R)
- M65: 17,122,673 km (0.103 R)
- M66: 17,214,825 km (0.119 R)
- M67: 17,894,748 km (0.106 R)
- M68: 18,113,011 km (0.086 R)
- M69: 18,457,684 km (0.061 R)
- M70: 18,583,646 km (0.079 R)
- M71: 18,899,597 km (0.084 R)
- M72: 20,571,054 km (0.062 R)
- M73: 20,701,503 km (0.078 R)
- M74: 20,996,211 km (0.062 R)
- M75: 21,061,884 km (0.12 R)
- M76: 21,259,353 km (0.063 R)
- M77: 21,391,299 km (0.066 R)
- M78: 21,589,815 km (0.103 R)
- M79: 21,788,930 km (0.119 R)
- M80: 22,022,003 km (0.116 R)
Planet 5 - Ice Giant
Semi-Major Axis: 6.19 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 736.1
Radius: 7.5
Gravity: 13.09 G
Time & Orbit
Eccentricity (e): 0.174
Orbit Range: 5.11 AU - 7.27 AU
Year: 9944 Days
Day: 20.5 Hours
Environment
Temp: -228 °C
Axial Tilt: 15.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (92)
Outer Limit: 57,405,526 km
- M1: 97,687 km (0.098 R)
- M2: 157,377 km (0.073 R)
- M3: 723,007 km (0.089 R)
- M4: 775,216 km (0.104 R)
- M5: 1,156,691 km (0.087 R)
- M6: 1,433,447 km (0.111 R)
- M7: 1,660,237 km (0.098 R)
- M8: 2,173,507 km (0.078 R)
- M9: 2,407,927 km (0.099 R)
- M10: 2,650,575 km (0.114 R)
- M11: 2,788,804 km (0.08 R)
- M12: 2,901,002 km (0.084 R)
- M13: 3,217,701 km (0.066 R)
- M14: 3,305,963 km (0.099 R)
- M15: 3,545,320 km (0.097 R)
- M16: 3,606,057 km (0.086 R)
- M17: 4,791,321 km (0.113 R)
- M18: 5,234,280 km (0.091 R)
- M19: 5,303,544 km (0.068 R)
- M20: 5,941,130 km (0.032 R)
- M21: 6,013,535 km (0.083 R)
- M22: 7,249,064 km (0.085 R)
- M23: 8,765,238 km (0.078 R)
- M24: 8,930,394 km (0.084 R)
- M25: 9,643,976 km (0.119 R)
- M26: 9,857,303 km (0.079 R)
- M27: 10,115,359 km (0.093 R)
- M28: 12,074,942 km (0.034 R)
- M29: 12,582,827 km (0.12 R)
- M30: 13,523,947 km (0.093 R)
- M31: 13,954,789 km (0.079 R)
- M32: 14,732,099 km (0.101 R)
- M33: 14,781,018 km (0.077 R)
- M34: 14,879,303 km (0.108 R)
- M35: 14,928,521 km (0.084 R)
- M36: 15,373,874 km (0.051 R)
- M37: 15,423,540 km (0.101 R)
- M38: 15,773,300 km (0.084 R)
- M39: 16,582,475 km (0.113 R)
- M40: 16,992,074 km (0.118 R)
- M41: 17,612,905 km (0.105 R)
- M42: 17,978,373 km (0.108 R)
- M43: 18,030,882 km (0.081 R)
- M44: 18,188,408 km (0.054 R)
- M45: 18,241,067 km (0.08 R)
- M46: 18,293,725 km (0.067 R)
- M47: 19,090,035 km (0.117 R)
- M48: 19,897,564 km (0.053 R)
- M49: 20,661,261 km (0.101 R)
- M50: 21,212,679 km (0.094 R)
- M51: 21,713,084 km (0.045 R)
- M52: 21,992,682 km (0.076 R)
- M53: 22,048,781 km (0.085 R)
- M54: 22,668,865 km (0.052 R)
- M55: 22,838,957 km (0.104 R)
- M56: 24,388,791 km (0.114 R)
- M57: 25,617,588 km (0.101 R)
- M58: 27,226,812 km (0.056 R)
- M59: 27,287,100 km (0.096 R)
- M60: 27,891,775 km (0.079 R)
- M61: 28,623,309 km (0.045 R)
- M62: 28,929,984 km (0.092 R)
- M63: 29,608,560 km (0.105 R)
- M64: 29,918,677 km (0.092 R)
- M65: 30,042,992 km (0.032 R)
- M66: 31,801,964 km (0.116 R)
- M67: 31,928,973 km (0.041 R)
- M68: 32,694,016 km (0.047 R)
- M69: 34,372,205 km (0.116 R)
- M70: 34,567,730 km (0.079 R)
- M71: 35,946,124 km (0.12 R)
- M72: 36,476,000 km (0.108 R)
- M73: 36,808,406 km (0.112 R)
- M74: 37,141,860 km (0.042 R)
- M75: 38,756,470 km (0.105 R)
- M76: 38,959,923 km (0.048 R)
- M77: 39,708,810 km (0.119 R)
- M78: 40,600,114 km (0.056 R)
- M79: 40,737,894 km (0.099 R)
- M80: 40,806,709 km (0.095 R)
- M81: 41,151,831 km (0.09 R)
- M82: 42,123,320 km (0.107 R)
- M83: 42,332,457 km (0.045 R)
- M84: 44,301,315 km (0.083 R)
- M85: 44,869,338 km (0.075 R)
- M86: 45,011,606 km (0.116 R)
- M87: 45,368,247 km (0.075 R)
- M88: 45,940,758 km (0.064 R)
- M89: 46,803,938 km (0.047 R)
- M90: 47,745,208 km (0.114 R)
- M91: 48,473,450 km (0.038 R)
- M92: 48,692,611 km (0.03 R)
Planet 6 - Ice Giant
Semi-Major Axis: 7.49 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 671.7
Radius: 7.4
Gravity: 12.27 G
Time & Orbit
Eccentricity (e): 0.151
Orbit Range: 6.36 AU - 8.62 AU
Year: 13235 Days
Day: 20.3 Hours
Environment
Temp: -218 °C
Axial Tilt: 41.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (96)
Outer Limit: 57,405,526 km
- M1: 125,662 km (0.076 R)
- M2: 219,011 km (0.107 R)
- M3: 533,466 km (0.1 R)
- M4: 732,880 km (0.112 R)
- M5: 811,269 km (0.103 R)
- M6: 1,904,381 km (0.047 R)
- M7: 2,240,228 km (0.069 R)
- M8: 2,327,144 km (0.1 R)
- M9: 2,385,787 km (0.083 R)
- M10: 2,934,961 km (0.094 R)
- M11: 3,623,410 km (0.117 R)
- M12: 3,863,664 km (0.119 R)
- M13: 4,073,849 km (0.115 R)
- M14: 4,216,117 km (0.089 R)
- M15: 4,838,743 km (0.12 R)
- M16: 4,951,540 km (0.084 R)
- M17: 5,103,382 km (0.099 R)
- M18: 5,686,514 km (0.068 R)
- M19: 6,127,529 km (0.047 R)
- M20: 7,084,955 km (0.078 R)
- M21: 8,766,286 km (0.104 R)
- M22: 9,321,892 km (0.072 R)
- M23: 10,466,914 km (0.028 R)
- M24: 11,304,513 km (0.09 R)
- M25: 11,454,559 km (0.118 R)
- M26: 11,655,619 km (0.116 R)
- M27: 12,265,978 km (0.029 R)
- M28: 12,317,290 km (0.083 R)
- M29: 12,782,540 km (0.09 R)
- M30: 14,428,565 km (0.118 R)
- M31: 14,537,023 km (0.098 R)
- M32: 14,864,044 km (0.089 R)
- M33: 14,973,550 km (0.114 R)
- M34: 15,083,355 km (0.116 R)
- M35: 15,359,213 km (0.107 R)
- M36: 15,469,916 km (0.096 R)
- M37: 15,803,818 km (0.042 R)
- M38: 16,196,363 km (0.069 R)
- M39: 16,535,352 km (0.044 R)
- M40: 16,991,027 km (0.08 R)
- M41: 17,740,363 km (0.117 R)
- M42: 17,973,137 km (0.103 R)
- M43: 18,441,528 km (0.101 R)
- M44: 19,151,819 km (0.1 R)
- M45: 20,904,956 km (0.118 R)
- M46: 22,394,203 km (0.065 R)
- M47: 22,645,826 km (0.111 R)
- M48: 23,725,175 km (0.077 R)
- M49: 23,789,203 km (0.038 R)
- M50: 24,174,567 km (0.082 R)
- M51: 24,756,353 km (0.099 R)
- M52: 25,539,348 km (0.091 R)
- M53: 26,862,242 km (0.039 R)
- M54: 27,129,424 km (0.062 R)
- M55: 27,734,099 km (0.091 R)
- M56: 28,478,947 km (0.082 R)
- M57: 28,751,514 km (0.069 R)
- M58: 29,161,861 km (0.085 R)
- M59: 29,230,526 km (0.089 R)
- M60: 29,299,042 km (0.059 R)
- M61: 30,057,653 km (0.116 R)
- M62: 30,752,984 km (0.085 R)
- M63: 34,018,705 km (0.104 R)
- M64: 34,743,058 km (0.118 R)
- M65: 34,888,467 km (0.055 R)
- M66: 35,253,187 km (0.117 R)
- M67: 35,326,191 km (0.11 R)
- M68: 36,207,023 km (0.118 R)
- M69: 36,280,775 km (0.091 R)
- M70: 36,428,428 km (0.1 R)
- M71: 37,243,736 km (0.119 R)
- M72: 37,616,385 km (0.097 R)
- M73: 38,817,207 km (0.099 R)
- M74: 38,892,604 km (0.094 R)
- M75: 39,194,941 km (0.049 R)
- M76: 39,346,484 km (0.108 R)
- M77: 39,954,300 km (0.098 R)
- M78: 40,106,740 km (0.097 R)
- M79: 40,183,035 km (0.041 R)
- M80: 40,335,625 km (0.114 R)
- M81: 40,488,664 km (0.089 R)
- M82: 40,871,784 km (0.119 R)
- M83: 43,195,787 km (0.052 R)
- M84: 45,482,839 km (0.078 R)
- M85: 46,600,934 km (0.074 R)
- M86: 46,841,636 km (0.071 R)
- M87: 46,921,971 km (0.119 R)
- M88: 47,405,022 km (0.112 R)
- M89: 47,970,801 km (0.056 R)
- M90: 48,782,669 km (0.088 R)
- M91: 49,762,984 km (0.108 R)
- M92: 50,997,615 km (0.05 R)
- M93: 52,492,247 km (0.084 R)
- M94: 54,761,198 km (0.076 R)
- M95: 56,206,164 km (0.101 R)
- M96: 57,147,883 km (0.034 R)
Kuiper Belt
Range: 30 - 59 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 497 - 19,574 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.