Star System Generated (Seed: 1766123475)
Star Details
Spectral Class: M5V
Temperature: 3,050 K
Mass: 0.3 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: 11 AU
Planetary System (8 Planets)
Planet 1 - Gas Giant
Semi-Major Axis: 0.5 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 264.9
Radius: 12.3
Gravity: 1.75 G
Time & Orbit
Eccentricity (e): 0.224
Orbit Range: 0.39 AU - 0.61 AU
Year: 236 Days
Day: 13.4 Hours
Environment
Temp: -140 °C
Axial Tilt: 21.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (26)
Outer Limit: 46,603,832 km
- M1: 153,637 km (0.098 R)
- M2: 237,711 km (0.097 R)
- M3: 335,099 km (0.077 R)
- M4: 462,706 km (0.099 R)
- M5: 540,647 km (0.108 R)
- M6: 638,185 km (0.098 R)
- M7: 735,274 km (0.107 R)
- M8: 815,009 km (0.1 R)
- M9: 927,507 km (0.098 R)
- M10: 1,006,644 km (0.094 R)
- M11: 1,137,243 km (0.119 R)
- M12: 1,225,655 km (0.094 R)
- M13: 1,353,711 km (0.11 R)
- M14: 1,448,107 km (0.094 R)
- M15: 1,590,674 km (0.05 R)
- M16: 1,697,487 km (0.032 R)
- M17: 1,820,606 km (0.068 R)
- M18: 1,971,850 km (0.111 R)
- M19: 2,153,013 km (0.118 R)
- M20: 2,264,463 km (0.089 R)
- M21: 2,355,119 km (0.057 R)
- M22: 2,443,083 km (0.06 R)
- M23: 2,543,912 km (0.088 R)
- M24: 2,626,490 km (0.092 R)
- M25: 2,786,111 km (0.046 R)
- M26: 2,871,382 km (0.117 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.84 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 201.7
Radius: 8.4
Gravity: 2.86 G
Time & Orbit
Eccentricity (e): 0.076
Orbit Range: 0.78 AU - 0.9 AU
Year: 513 Days
Day: 9.7 Hours
Environment
Temp: -164 °C
Axial Tilt: 42.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (39)
Outer Limit: 46,603,832 km
- M1: 109,356 km (0.094 R)
- M2: 169,195 km (0.113 R)
- M3: 226,491 km (0.074 R)
- M4: 317,746 km (0.12 R)
- M5: 390,151 km (0.109 R)
- M6: 452,234 km (0.118 R)
- M7: 545,135 km (0.068 R)
- M8: 597,494 km (0.077 R)
- M9: 697,724 km (0.086 R)
- M10: 793,467 km (0.064 R)
- M11: 853,905 km (0.085 R)
- M12: 908,657 km (0.104 R)
- M13: 979,716 km (0.043 R)
- M14: 1,099,993 km (0.063 R)
- M15: 1,258,268 km (0.102 R)
- M16: 1,363,884 km (0.114 R)
- M17: 1,441,824 km (0.064 R)
- M18: 1,534,575 km (0.092 R)
- M19: 1,588,580 km (0.115 R)
- M20: 1,877,752 km (0.116 R)
- M21: 1,945,371 km (0.084 R)
- M22: 2,018,823 km (0.078 R)
- M23: 2,208,962 km (0.082 R)
- M24: 2,270,297 km (0.096 R)
- M25: 2,342,553 km (0.098 R)
- M26: 2,478,837 km (0.113 R)
- M27: 2,537,180 km (0.06 R)
- M28: 2,606,892 km (0.098 R)
- M29: 2,748,262 km (0.092 R)
- M30: 2,886,491 km (0.086 R)
- M31: 3,193,167 km (0.119 R)
- M32: 3,391,683 km (0.057 R)
- M33: 3,450,774 km (0.115 R)
- M34: 3,684,895 km (0.119 R)
- M35: 3,813,100 km (0.084 R)
- M36: 3,868,451 km (0.073 R)
- M37: 3,942,652 km (0.038 R)
- M38: 4,073,849 km (0.079 R)
- M39: 4,289,270 km (0.088 R)
Planet 3 - Gas Giant
Semi-Major Axis: 1.65 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 114.3
Radius: 12.4
Gravity: 0.74 G
Time & Orbit
Eccentricity (e): 0.203
Orbit Range: 1.32 AU - 1.98 AU
Year: 1413 Days
Day: 12.5 Hours
Environment
Temp: -197 °C
Axial Tilt: 38.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (34)
Outer Limit: 46,603,832 km
- M1: 173,982 km (0.076 R)
- M2: 254,616 km (0.1 R)
- M3: 478,863 km (0.042 R)
- M4: 739,013 km (0.119 R)
- M5: 901,926 km (0.071 R)
- M6: 1,093,710 km (0.104 R)
- M7: 1,293,872 km (0.071 R)
- M8: 1,494,483 km (0.115 R)
- M9: 1,654,852 km (0.115 R)
- M10: 1,756,578 km (0.034 R)
- M11: 2,027,201 km (0.1 R)
- M12: 2,178,145 km (0.09 R)
- M13: 2,572,036 km (0.086 R)
- M14: 2,819,321 km (0.059 R)
- M15: 2,988,517 km (0.112 R)
- M16: 3,177,160 km (0.07 R)
- M17: 3,410,233 km (0.083 R)
- M18: 3,674,273 km (0.083 R)
- M19: 3,962,100 km (0.095 R)
- M20: 4,126,208 km (0.115 R)
- M21: 4,336,693 km (0.101 R)
- M22: 4,677,477 km (0.069 R)
- M23: 4,961,862 km (0.104 R)
- M24: 5,139,136 km (0.082 R)
- M25: 5,471,093 km (0.113 R)
- M26: 5,780,761 km (0.119 R)
- M27: 5,878,598 km (0.061 R)
- M28: 6,046,447 km (0.088 R)
- M29: 6,165,975 km (0.116 R)
- M30: 6,336,517 km (0.037 R)
- M31: 6,579,913 km (0.052 R)
- M32: 6,661,892 km (0.117 R)
- M33: 6,919,799 km (0.052 R)
- M34: 7,065,807 km (0.12 R)
Planet 4 - Gas Giant
Semi-Major Axis: 2.16 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 163.3
Radius: 12.6
Gravity: 1.03 G
Time & Orbit
Eccentricity (e): 0.162
Orbit Range: 1.81 AU - 2.51 AU
Year: 2117 Days
Day: 7.4 Hours
Environment
Temp: -206 °C
Axial Tilt: 39.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (54)
Outer Limit: 46,603,832 km
- M1: 177,722 km (0.084 R)
- M2: 273,016 km (0.078 R)
- M3: 456,423 km (0.081 R)
- M4: 599,887 km (0.1 R)
- M5: 689,796 km (0.114 R)
- M6: 797,506 km (0.063 R)
- M7: 892,052 km (0.108 R)
- M8: 1,059,153 km (0.091 R)
- M9: 1,356,703 km (0.092 R)
- M10: 1,441,226 km (0.113 R)
- M11: 1,543,401 km (0.106 R)
- M12: 1,640,191 km (0.106 R)
- M13: 1,730,698 km (0.091 R)
- M14: 1,857,108 km (0.105 R)
- M15: 2,039,318 km (0.108 R)
- M16: 2,164,232 km (0.063 R)
- M17: 2,375,165 km (0.074 R)
- M18: 2,748,412 km (0.083 R)
- M19: 2,887,089 km (0.096 R)
- M20: 2,967,423 km (0.086 R)
- M21: 3,068,851 km (0.109 R)
- M22: 3,161,153 km (0.028 R)
- M23: 3,254,502 km (0.082 R)
- M24: 3,348,748 km (0.093 R)
- M25: 3,454,514 km (0.041 R)
- M26: 3,658,715 km (0.095 R)
- M27: 3,944,597 km (0.055 R)
- M28: 4,112,894 km (0.085 R)
- M29: 4,620,629 km (0.091 R)
- M30: 4,893,945 km (0.11 R)
- M31: 5,087,225 km (0.069 R)
- M32: 5,184,913 km (0.091 R)
- M33: 5,270,931 km (0.076 R)
- M34: 5,394,499 km (0.099 R)
- M35: 5,796,618 km (0.109 R)
- M36: 5,885,928 km (0.103 R)
- M37: 6,001,418 km (0.08 R)
- M38: 6,156,551 km (0.11 R)
- M39: 6,683,434 km (0.047 R)
- M40: 6,777,232 km (0.095 R)
- M41: 6,857,866 km (0.107 R)
- M42: 6,966,025 km (0.092 R)
- M43: 7,266,118 km (0.083 R)
- M44: 7,348,846 km (0.1 R)
- M45: 7,682,449 km (0.109 R)
- M46: 7,808,859 km (0.111 R)
- M47: 8,063,624 km (0.119 R)
- M48: 8,163,556 km (0.063 R)
- M49: 8,393,488 km (0.034 R)
- M50: 9,229,740 km (0.112 R)
- M51: 9,484,206 km (0.071 R)
- M52: 9,635,150 km (0.081 R)
- M53: 9,725,956 km (0.081 R)
- M54: 10,184,773 km (0.107 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.3 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 350
Radius: 14.8
Gravity: 1.6 G
Time & Orbit
Eccentricity (e): 0.18
Orbit Range: 1.89 AU - 2.71 AU
Year: 2326 Days
Day: 10.6 Hours
Environment
Temp: -200 °C
Axial Tilt: 31.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (58)
Outer Limit: 46,603,832 km
- M1: 224,546 km (0.087 R)
- M2: 778,956 km (0.106 R)
- M3: 1,074,262 km (0.073 R)
- M4: 1,240,615 km (0.105 R)
- M5: 1,341,145 km (0.116 R)
- M6: 1,444,816 km (0.067 R)
- M7: 1,551,330 km (0.114 R)
- M8: 1,762,413 km (0.106 R)
- M9: 1,919,341 km (0.067 R)
- M10: 2,059,215 km (0.034 R)
- M11: 2,169,319 km (0.087 R)
- M12: 2,535,385 km (0.112 R)
- M13: 2,823,061 km (0.073 R)
- M14: 3,339,473 km (0.095 R)
- M15: 3,575,838 km (0.034 R)
- M16: 3,844,964 km (0.106 R)
- M17: 3,940,707 km (0.112 R)
- M18: 4,120,823 km (0.034 R)
- M19: 4,247,084 km (0.085 R)
- M20: 4,460,560 km (0.086 R)
- M21: 4,561,389 km (0.049 R)
- M22: 4,721,458 km (0.071 R)
- M23: 4,853,703 km (0.117 R)
- M24: 5,380,437 km (0.088 R)
- M25: 5,534,373 km (0.105 R)
- M26: 5,627,423 km (0.083 R)
- M27: 6,342,052 km (0.04 R)
- M28: 6,455,747 km (0.106 R)
- M29: 6,586,645 km (0.115 R)
- M30: 6,701,985 km (0.119 R)
- M31: 7,001,480 km (0.115 R)
- M32: 7,102,309 km (0.038 R)
- M33: 7,237,545 km (0.108 R)
- M34: 7,356,475 km (0.043 R)
- M35: 7,787,018 km (0.099 R)
- M36: 8,066,766 km (0.117 R)
- M37: 8,332,153 km (0.046 R)
- M38: 8,546,676 km (0.071 R)
- M39: 8,762,845 km (0.077 R)
- M40: 8,871,752 km (0.118 R)
- M41: 9,017,460 km (0.084 R)
- M42: 9,385,471 km (0.108 R)
- M43: 9,758,568 km (0.098 R)
- M44: 9,965,761 km (0.111 R)
- M45: 10,155,451 km (0.078 R)
- M46: 10,365,487 km (0.117 R)
- M47: 10,751,150 km (0.079 R)
- M48: 11,082,659 km (0.051 R)
- M49: 11,377,965 km (0.08 R)
- M50: 11,536,689 km (0.066 R)
- M51: 12,198,659 km (0.108 R)
- M52: 12,687,844 km (0.074 R)
- M53: 12,811,262 km (0.059 R)
- M54: 13,017,558 km (0.115 R)
- M55: 13,142,023 km (0.084 R)
- M56: 13,580,495 km (0.074 R)
- M57: 13,875,651 km (0.03 R)
- M58: 14,429,163 km (0.087 R)
Planet 6 - Gas Giant
Semi-Major Axis: 2.35 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 196.2
Radius: 14.2
Gravity: 0.97 G
Time & Orbit
Eccentricity (e): 0.025
Orbit Range: 2.29 AU - 2.41 AU
Year: 2402 Days
Day: 9.4 Hours
Environment
Temp: -207 °C
Axial Tilt: 26.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (60)
Outer Limit: 46,603,832 km
- M1: 177,722 km (0.099 R)
- M2: 269,276 km (0.082 R)
- M3: 385,215 km (0.111 R)
- M4: 545,733 km (0.072 R)
- M5: 676,781 km (0.103 R)
- M6: 766,839 km (0.065 R)
- M7: 882,627 km (0.104 R)
- M8: 1,020,108 km (0.071 R)
- M9: 1,141,881 km (0.105 R)
- M10: 1,521,261 km (0.057 R)
- M11: 1,698,833 km (0.083 R)
- M12: 1,855,462 km (0.112 R)
- M13: 2,124,290 km (0.063 R)
- M14: 2,213,600 km (0.113 R)
- M15: 2,365,142 km (0.093 R)
- M16: 2,457,743 km (0.084 R)
- M17: 2,604,499 km (0.1 R)
- M18: 2,721,933 km (0.1 R)
- M19: 2,852,083 km (0.112 R)
- M20: 3,141,256 km (0.086 R)
- M21: 3,266,619 km (0.05 R)
- M22: 3,451,971 km (0.041 R)
- M23: 3,581,523 km (0.067 R)
- M24: 3,748,773 km (0.093 R)
- M25: 4,091,203 km (0.083 R)
- M26: 4,329,362 km (0.105 R)
- M27: 4,443,954 km (0.115 R)
- M28: 4,585,175 km (0.095 R)
- M29: 4,688,996 km (0.088 R)
- M30: 4,793,415 km (0.081 R)
- M31: 5,125,223 km (0.105 R)
- M32: 5,547,089 km (0.078 R)
- M33: 5,769,391 km (0.12 R)
- M34: 5,937,988 km (0.034 R)
- M35: 6,366,736 km (0.118 R)
- M36: 6,497,335 km (0.104 R)
- M37: 6,954,207 km (0.106 R)
- M38: 7,360,664 km (0.093 R)
- M39: 7,574,439 km (0.036 R)
- M40: 7,697,558 km (0.051 R)
- M41: 7,961,449 km (0.067 R)
- M42: 8,086,662 km (0.108 R)
- M43: 8,212,474 km (0.086 R)
- M44: 8,354,891 km (0.104 R)
- M45: 8,530,071 km (0.093 R)
- M46: 8,900,475 km (0.071 R)
- M47: 9,030,475 km (0.096 R)
- M48: 9,193,986 km (0.113 R)
- M49: 9,391,306 km (0.042 R)
- M50: 9,507,244 km (0.091 R)
- M51: 9,891,262 km (0.083 R)
- M52: 10,110,572 km (0.082 R)
- M53: 10,639,999 km (0.087 R)
- M54: 10,986,468 km (0.108 R)
- M55: 11,126,192 km (0.031 R)
- M56: 11,407,137 km (0.115 R)
- M57: 11,513,202 km (0.088 R)
- M58: 11,744,031 km (0.106 R)
- M59: 11,958,405 km (0.037 R)
- M60: 12,048,164 km (0.051 R)
Planet 7 - Gas Giant
Semi-Major Axis: 3 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 375.9
Radius: 13.8
Gravity: 1.97 G
Time & Orbit
Eccentricity (e): 0.052
Orbit Range: 2.84 AU - 3.16 AU
Year: 3465 Days
Day: 6.2 Hours
Environment
Temp: -216 °C
Axial Tilt: 11.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (69)
Outer Limit: 46,603,832 km
- M1: 174,730 km (0.089 R)
- M2: 313,707 km (0.063 R)
- M3: 412,441 km (0.099 R)
- M4: 664,065 km (0.119 R)
- M5: 815,159 km (0.088 R)
- M6: 949,348 km (0.116 R)
- M7: 1,040,004 km (0.078 R)
- M8: 1,220,120 km (0.054 R)
- M9: 1,411,157 km (0.086 R)
- M10: 2,018,225 km (0.088 R)
- M11: 2,357,513 km (0.069 R)
- M12: 3,183,742 km (0.067 R)
- M13: 3,612,489 km (0.073 R)
- M14: 3,809,211 km (0.043 R)
- M15: 3,908,843 km (0.116 R)
- M16: 4,093,746 km (0.11 R)
- M17: 4,684,209 km (0.101 R)
- M18: 4,791,171 km (0.105 R)
- M19: 5,153,946 km (0.12 R)
- M20: 5,264,499 km (0.08 R)
- M21: 5,582,095 km (0.053 R)
- M22: 5,829,380 km (0.031 R)
- M23: 6,060,808 km (0.098 R)
- M24: 6,177,644 km (0.109 R)
- M25: 6,552,686 km (0.083 R)
- M26: 6,813,734 km (0.119 R)
- M27: 6,955,703 km (0.102 R)
- M28: 7,057,728 km (0.106 R)
- M29: 7,283,920 km (0.08 R)
- M30: 7,387,592 km (0.09 R)
- M31: 7,512,506 km (0.084 R)
- M32: 7,743,635 km (0.084 R)
- M33: 8,019,643 km (0.096 R)
- M34: 8,472,625 km (0.11 R)
- M35: 8,581,682 km (0.108 R)
- M36: 8,801,292 km (0.113 R)
- M37: 9,089,567 km (0.096 R)
- M38: 9,178,877 km (0.104 R)
- M39: 9,561,698 km (0.098 R)
- M40: 9,881,089 km (0.114 R)
- M41: 10,671,265 km (0.092 R)
- M42: 10,765,512 km (0.106 R)
- M43: 10,883,843 km (0.09 R)
- M44: 11,193,361 km (0.111 R)
- M45: 11,530,106 km (0.072 R)
- M46: 11,723,985 km (0.065 R)
- M47: 11,918,911 km (0.107 R)
- M48: 12,016,748 km (0.091 R)
- M49: 12,609,754 km (0.108 R)
- M50: 12,834,600 km (0.111 R)
- M51: 12,960,112 km (0.097 R)
- M52: 13,237,766 km (0.049 R)
- M53: 13,364,475 km (0.049 R)
- M54: 13,517,215 km (0.035 R)
- M55: 13,747,446 km (0.078 R)
- M56: 14,030,485 km (0.092 R)
- M57: 14,341,499 km (0.117 R)
- M58: 14,733,595 km (0.111 R)
- M59: 15,049,695 km (0.097 R)
- M60: 15,235,197 km (0.088 R)
- M61: 15,394,818 km (0.117 R)
- M62: 15,501,481 km (0.115 R)
- M63: 16,418,516 km (0.064 R)
- M64: 16,746,285 km (0.101 R)
- M65: 16,856,090 km (0.062 R)
- M66: 17,048,772 km (0.096 R)
- M67: 17,575,356 km (0.073 R)
- M68: 18,079,351 km (0.076 R)
- M69: 18,958,239 km (0.103 R)
Planet 8 - Ice Giant
Semi-Major Axis: 10.18 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 134.2
Radius: 7.9
Gravity: 2.15 G
Time & Orbit
Eccentricity (e): 0.161
Orbit Range: 8.54 AU - 11.82 AU
Year: 21660 Days
Day: 23.9 Hours
Environment
Temp: -233 °C
Axial Tilt: 15.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (63)
Outer Limit: 46,603,832 km
- M1: 339,886 km (0.059 R)
- M2: 665,711 km (0.105 R)
- M3: 1,438,533 km (0.112 R)
- M4: 1,503,159 km (0.071 R)
- M5: 2,800,023 km (0.107 R)
- M6: 3,186,883 km (0.065 R)
- M7: 3,798,739 km (0.059 R)
- M8: 3,949,833 km (0.056 R)
- M9: 4,041,386 km (0.078 R)
- M10: 4,383,218 km (0.113 R)
- M11: 4,509,927 km (0.085 R)
- M12: 5,911,509 km (0.108 R)
- M13: 5,981,372 km (0.055 R)
- M14: 6,228,208 km (0.099 R)
- M15: 7,211,216 km (0.117 R)
- M16: 9,034,814 km (0.091 R)
- M17: 9,196,380 km (0.103 R)
- M18: 10,018,121 km (0.113 R)
- M19: 10,269,295 km (0.066 R)
- M20: 10,777,779 km (0.107 R)
- M21: 11,512,155 km (0.088 R)
- M22: 12,801,838 km (0.06 R)
- M23: 13,074,405 km (0.073 R)
- M24: 13,257,214 km (0.117 R)
- M25: 13,440,770 km (0.113 R)
- M26: 15,515,543 km (0.098 R)
- M27: 15,709,123 km (0.059 R)
- M28: 16,589,805 km (0.116 R)
- M29: 18,398,893 km (0.077 R)
- M30: 18,603,692 km (0.038 R)
- M31: 18,706,466 km (0.098 R)
- M32: 19,170,967 km (0.044 R)
- M33: 21,173,933 km (0.03 R)
- M34: 21,604,176 km (0.102 R)
- M35: 22,363,685 km (0.047 R)
- M36: 22,911,662 km (0.047 R)
- M37: 23,797,580 km (0.097 R)
- M38: 24,076,730 km (0.114 R)
- M39: 24,694,719 km (0.075 R)
- M40: 25,147,402 km (0.088 R)
- M41: 27,568,644 km (0.061 R)
- M42: 28,155,965 km (0.108 R)
- M43: 28,688,084 km (0.06 R)
- M44: 28,925,795 km (0.111 R)
- M45: 30,546,539 km (0.096 R)
- M46: 31,643,241 km (0.092 R)
- M47: 31,704,576 km (0.086 R)
- M48: 31,827,396 km (0.106 R)
- M49: 32,011,700 km (0.088 R)
- M50: 33,624,814 km (0.07 R)
- M51: 34,126,416 km (0.12 R)
- M52: 35,137,099 km (0.105 R)
- M53: 36,671,524 km (0.116 R)
- M54: 37,641,667 km (0.074 R)
- M55: 37,706,592 km (0.112 R)
- M56: 40,004,116 km (0.091 R)
- M57: 40,602,208 km (0.1 R)
- M58: 41,941,857 km (0.052 R)
- M59: 42,009,176 km (0.079 R)
- M60: 42,820,296 km (0.075 R)
- M61: 44,733,054 km (0.087 R)
- M62: 46,534,063 km (0.104 R)
- M63: 46,603,776 km (0.073 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: 196 - 19,331 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.