G8V Star System Generated (Seed: 1767024784)
Star Details
Spectral Class: G3V
Temperature: 5,720 K
Mass: 1.03 sol
Luminosity: 1.11 lux
Habitable Zone (HZ)
Inner Boundary: 1 AU
Outer Boundary: 1.45 AU
Physical Limits
Snow Line: 5.06 AU
Max System Radius: 20.3 AU
Planetary System (9 Planets)
Planet 1 - Terrestrial
Semi-Major Axis: 1.56 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.41
Radius: 1.63
Gravity: 1.28 G
Time & Orbit
Eccentricity (e): 0.122
Orbit Range: 1.37 AU - 1.75 AU
Year: 701 Days
Day: 42.2 Hours
Environment
Temp: -25 °C
Axial Tilt: 29.2 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (2)
Outer Limit: 61,304,411 km
- M1: 920,775 km (0.09 R)
- M2: 1,299,407 km (0.114 R)
Planet 2 - Terrestrial
Semi-Major Axis: 1.63 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 1.85
Radius: 1.28
Gravity: 1.13 G
Time & Orbit
Eccentricity (e): 0.203
Orbit Range: 1.3 AU - 1.96 AU
Year: 749 Days
Day: 38.7 Hours
Environment
Temp: -44 °C
Axial Tilt: 39.5 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 61,304,411 km
- M1: 401,221 km (0.072 R)
Planet 3 - Terrestrial
Semi-Major Axis: 1.87 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 0.51
Radius: 0.76
Gravity: 0.88 G
Time & Orbit
Eccentricity (e): 0.159
Orbit Range: 1.57 AU - 2.17 AU
Year: 920 Days
Day: 37.1 Hours
Environment
Temp: -63 °C
Axial Tilt: 8.9 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Satellites (1)
Outer Limit: 61,304,411 km
- M1: 223,350 km (0.047 R)
Planet 4 - Terrestrial
Semi-Major Axis: 4.79 AU
Status: Outer (Cold)
Composition: Rocky (Silicates/Metals)
Physical Data
Mass: 3.75
Radius: 1.7
Gravity: 1.3 G
Time & Orbit
Eccentricity (e): 0.06
Orbit Range: 4.5 AU - 5.08 AU
Year: 3773 Days
Day: 21.4 Hours
Environment
Temp: -133 °C
Axial Tilt: 23.3 °
Atmosphere: Thin Nâ‚‚/CHâ‚„
Biome: Ice Cap/Desert
Planet 5 - Gas Giant
Semi-Major Axis: 8.31 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 497
Radius: 10.1
Gravity: 4.87 G
Time & Orbit
Eccentricity (e): 0.109
Orbit Range: 7.4 AU - 9.22 AU
Year: 8621 Days
Day: 9.6 Hours
Environment
Temp: -162 °C
Axial Tilt: 35.8 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (72)
Outer Limit: 61,304,411 km
- M1: 358,736 km (0.111 R)
- M2: 436,676 km (0.042 R)
- M3: 861,385 km (0.07 R)
- M4: 1,089,372 km (0.094 R)
- M5: 1,246,449 km (0.101 R)
- M6: 1,505,852 km (0.104 R)
- M7: 1,701,975 km (0.093 R)
- M8: 1,844,243 km (0.114 R)
- M9: 1,948,512 km (0.091 R)
- M10: 2,228,559 km (0.109 R)
- M11: 2,295,131 km (0.086 R)
- M12: 2,661,346 km (0.032 R)
- M13: 2,779,678 km (0.108 R)
- M14: 3,195,111 km (0.067 R)
- M15: 3,270,509 km (0.078 R)
- M16: 3,603,962 km (0.066 R)
- M17: 4,111,249 km (0.075 R)
- M18: 4,221,054 km (0.051 R)
- M19: 4,359,432 km (0.095 R)
- M20: 4,499,455 km (0.085 R)
- M21: 4,755,417 km (0.042 R)
- M22: 4,899,629 km (0.063 R)
- M23: 5,551,427 km (0.113 R)
- M24: 5,733,937 km (0.074 R)
- M25: 6,676,254 km (0.114 R)
- M26: 6,870,581 km (0.081 R)
- M27: 7,869,596 km (0.098 R)
- M28: 8,143,809 km (0.05 R)
- M29: 8,842,730 km (0.109 R)
- M30: 9,127,864 km (0.113 R)
- M31: 9,307,531 km (0.055 R)
- M32: 9,379,637 km (0.104 R)
- M33: 10,074,968 km (0.051 R)
- M34: 12,258,798 km (0.087 R)
- M35: 13,139,480 km (0.047 R)
- M36: 13,301,794 km (0.025 R)
- M37: 13,546,536 km (0.092 R)
- M38: 16,075,039 km (0.1 R)
- M39: 16,161,806 km (0.048 R)
- M40: 16,423,004 km (0.116 R)
- M41: 17,170,694 km (0.052 R)
- M42: 17,526,438 km (0.075 R)
- M43: 17,839,696 km (0.119 R)
- M44: 18,335,762 km (0.113 R)
- M45: 18,517,224 km (0.116 R)
- M46: 18,608,180 km (0.075 R)
- M47: 19,572,338 km (0.1 R)
- M48: 20,411,732 km (0.103 R)
- M49: 20,977,810 km (0.106 R)
- M50: 21,262,794 km (0.068 R)
- M51: 22,222,165 km (0.094 R)
- M52: 23,885,095 km (0.091 R)
- M53: 25,032,511 km (0.115 R)
- M54: 26,351,216 km (0.094 R)
- M55: 26,556,165 km (0.104 R)
- M56: 27,122,393 km (0.114 R)
- M57: 27,484,719 km (0.082 R)
- M58: 27,744,571 km (0.084 R)
- M59: 28,266,667 km (0.11 R)
- M60: 28,423,895 km (0.116 R)
- M61: 28,791,905 km (0.102 R)
- M62: 29,426,649 km (0.059 R)
- M63: 30,333,661 km (0.104 R)
- M64: 30,817,461 km (0.119 R)
- M65: 31,141,490 km (0.117 R)
- M66: 34,275,565 km (0.074 R)
- M67: 35,286,099 km (0.113 R)
- M68: 35,398,895 km (0.116 R)
- M69: 35,568,539 km (0.116 R)
- M70: 36,477,197 km (0.098 R)
- M71: 38,028,078 km (0.085 R)
- M72: 38,317,550 km (0.102 R)
Planet 6 - Gas Giant
Semi-Major Axis: 11.02 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 885.6
Radius: 14.9
Gravity: 3.99 G
Time & Orbit
Eccentricity (e): 0.154
Orbit Range: 9.32 AU - 12.72 AU
Year: 13166 Days
Day: 14.2 Hours
Environment
Temp: -169 °C
Axial Tilt: 26.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (82)
Outer Limit: 61,304,411 km
- M1: 187,297 km (0.113 R)
- M2: 630,405 km (0.096 R)
- M3: 742,903 km (0.113 R)
- M4: 1,269,936 km (0.117 R)
- M5: 2,016,579 km (0.105 R)
- M6: 2,163,036 km (0.046 R)
- M7: 2,404,935 km (0.087 R)
- M8: 3,082,913 km (0.084 R)
- M9: 3,710,177 km (0.1 R)
- M10: 4,842,483 km (0.103 R)
- M11: 5,121,483 km (0.082 R)
- M12: 6,507,208 km (0.065 R)
- M13: 6,726,967 km (0.111 R)
- M14: 7,862,565 km (0.077 R)
- M15: 8,524,386 km (0.075 R)
- M16: 8,668,598 km (0.12 R)
- M17: 9,253,526 km (0.043 R)
- M18: 9,451,444 km (0.119 R)
- M19: 9,952,148 km (0.083 R)
- M20: 10,410,366 km (0.106 R)
- M21: 10,667,974 km (0.119 R)
- M22: 11,506,320 km (0.118 R)
- M23: 11,987,277 km (0.118 R)
- M24: 12,094,988 km (0.08 R)
- M25: 12,203,147 km (0.077 R)
- M26: 12,858,535 km (0.036 R)
- M27: 15,009,005 km (0.1 R)
- M28: 15,711,217 km (0.083 R)
- M29: 16,304,522 km (0.066 R)
- M30: 18,376,303 km (0.115 R)
- M31: 21,505,442 km (0.089 R)
- M32: 21,899,782 km (0.112 R)
- M33: 22,164,121 km (0.111 R)
- M34: 22,296,665 km (0.03 R)
- M35: 22,562,500 km (0.107 R)
- M36: 23,097,462 km (0.059 R)
- M37: 23,704,231 km (0.073 R)
- M38: 23,839,767 km (0.068 R)
- M39: 24,179,803 km (0.031 R)
- M40: 25,002,442 km (0.07 R)
- M41: 25,694,930 km (0.065 R)
- M42: 26,043,643 km (0.051 R)
- M43: 27,098,906 km (0.08 R)
- M44: 28,744,184 km (0.113 R)
- M45: 29,396,879 km (0.083 R)
- M46: 30,864,584 km (0.117 R)
- M47: 32,130,930 km (0.113 R)
- M48: 33,262,339 km (0.11 R)
- M49: 33,490,176 km (0.093 R)
- M50: 34,945,315 km (0.119 R)
- M51: 35,331,726 km (0.074 R)
- M52: 37,442,552 km (0.114 R)
- M53: 38,393,695 km (0.069 R)
- M54: 38,712,488 km (0.113 R)
- M55: 39,835,519 km (0.081 R)
- M56: 40,563,014 km (0.113 R)
- M57: 43,516,674 km (0.053 R)
- M58: 44,182,534 km (0.106 R)
- M59: 44,432,961 km (0.092 R)
- M60: 46,284,684 km (0.113 R)
- M61: 46,539,150 km (0.081 R)
- M62: 47,219,969 km (0.119 R)
- M63: 49,109,241 km (0.051 R)
- M64: 49,889,244 km (0.114 R)
- M65: 51,110,711 km (0.037 R)
- M66: 53,405,243 km (0.041 R)
- M67: 53,672,275 km (0.117 R)
- M68: 55,643,078 km (0.103 R)
- M69: 55,913,700 km (0.12 R)
- M70: 56,184,771 km (0.097 R)
- M71: 56,637,455 km (0.09 R)
- M72: 56,909,723 km (0.103 R)
- M73: 58,460,305 km (0.062 R)
- M74: 59,471,138 km (0.114 R)
- M75: 59,655,592 km (0.118 R)
- M76: 59,840,195 km (0.062 R)
- M77: 60,024,949 km (0.076 R)
- M78: 60,580,406 km (0.101 R)
- M79: 61,044,608 km (0.104 R)
- M80: 61,603,356 km (0.089 R)
- M81: 61,789,905 km (0.09 R)
- M82: 62,257,248 km (0.097 R)
Planet 7 - Gas Giant
Semi-Major Axis: 12 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 131.8
Radius: 10.8
Gravity: 1.13 G
Time & Orbit
Eccentricity (e): 0.192
Orbit Range: 9.7 AU - 14.3 AU
Year: 14960 Days
Day: 12 Hours
Environment
Temp: -172 °C
Axial Tilt: 28 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (50)
Outer Limit: 61,304,411 km
- M1: 137,480 km (0.114 R)
- M2: 260,151 km (0.031 R)
- M3: 390,899 km (0.059 R)
- M4: 773,720 km (0.08 R)
- M5: 860,188 km (0.091 R)
- M6: 1,108,071 km (0.104 R)
- M7: 2,003,115 km (0.113 R)
- M8: 2,104,992 km (0.11 R)
- M9: 3,050,450 km (0.097 R)
- M10: 3,335,733 km (0.102 R)
- M11: 3,804,872 km (0.071 R)
- M12: 3,931,881 km (0.092 R)
- M13: 4,832,759 km (0.108 R)
- M14: 4,970,539 km (0.097 R)
- M15: 6,089,681 km (0.049 R)
- M16: 7,032,895 km (0.071 R)
- M17: 7,252,206 km (0.043 R)
- M18: 8,615,192 km (0.102 R)
- M19: 8,985,147 km (0.118 R)
- M20: 9,950,203 km (0.097 R)
- M21: 10,196,591 km (0.091 R)
- M22: 10,767,456 km (0.094 R)
- M23: 10,875,616 km (0.111 R)
- M24: 11,129,483 km (0.071 R)
- M25: 11,902,904 km (0.113 R)
- M26: 12,541,687 km (0.12 R)
- M27: 12,693,529 km (0.065 R)
- M28: 13,540,103 km (0.069 R)
- M29: 13,774,074 km (0.086 R)
- M30: 14,444,572 km (0.083 R)
- M31: 14,884,091 km (0.092 R)
- M32: 15,612,632 km (0.072 R)
- M33: 16,978,461 km (0.115 R)
- M34: 17,484,700 km (0.054 R)
- M35: 19,734,802 km (0.078 R)
- M36: 20,311,501 km (0.084 R)
- M37: 20,669,190 km (0.069 R)
- M38: 20,983,794 km (0.066 R)
- M39: 23,933,415 km (0.106 R)
- M40: 24,027,662 km (0.033 R)
- M41: 24,500,840 km (0.101 R)
- M42: 24,595,835 km (0.093 R)
- M43: 25,120,474 km (0.087 R)
- M44: 26,132,354 km (0.047 R)
- M45: 29,096,187 km (0.026 R)
- M46: 29,499,354 km (0.066 R)
- M47: 30,413,247 km (0.054 R)
- M48: 32,634,028 km (0.102 R)
- M49: 33,262,937 km (0.115 R)
- M50: 34,533,023 km (0.061 R)
Planet 8 - Gas Giant
Semi-Major Axis: 12.45 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 909.5
Radius: 13
Gravity: 5.38 G
Time & Orbit
Eccentricity (e): 0.228
Orbit Range: 9.61 AU - 15.29 AU
Year: 15810 Days
Day: 12.8 Hours
Environment
Temp: -192 °C
Axial Tilt: 75.1 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (84)
Outer Limit: 61,304,411 km
- M1: 167,998 km (0.103 R)
- M2: 279,898 km (0.101 R)
- M3: 378,782 km (0.04 R)
- M4: 797,805 km (0.056 R)
- M5: 983,307 km (0.057 R)
- M6: 1,343,838 km (0.083 R)
- M7: 2,152,265 km (0.059 R)
- M8: 2,283,462 km (0.07 R)
- M9: 3,621,764 km (0.097 R)
- M10: 3,818,635 km (0.053 R)
- M11: 4,899,330 km (0.111 R)
- M12: 5,837,907 km (0.071 R)
- M13: 6,116,309 km (0.117 R)
- M14: 6,494,343 km (0.114 R)
- M15: 6,686,127 km (0.088 R)
- M16: 7,472,563 km (0.095 R)
- M17: 8,184,649 km (0.081 R)
- M18: 8,548,920 km (0.033 R)
- M19: 9,783,102 km (0.098 R)
- M20: 9,893,057 km (0.109 R)
- M21: 10,337,063 km (0.036 R)
- M22: 10,505,211 km (0.11 R)
- M23: 11,941,949 km (0.107 R)
- M24: 12,833,403 km (0.066 R)
- M25: 13,135,291 km (0.051 R)
- M26: 14,995,990 km (0.107 R)
- M27: 15,377,913 km (0.102 R)
- M28: 15,505,969 km (0.12 R)
- M29: 16,216,559 km (0.108 R)
- M30: 16,346,859 km (0.094 R)
- M31: 17,202,708 km (0.06 R)
- M32: 17,602,583 km (0.115 R)
- M33: 17,803,792 km (0.047 R)
- M34: 18,684,026 km (0.099 R)
- M35: 19,163,936 km (0.082 R)
- M36: 20,698,511 km (0.071 R)
- M37: 21,480,609 km (0.086 R)
- M38: 22,708,358 km (0.049 R)
- M39: 24,181,598 km (0.116 R)
- M40: 25,382,570 km (0.104 R)
- M41: 25,990,236 km (0.069 R)
- M42: 26,142,976 km (0.073 R)
- M43: 26,602,690 km (0.112 R)
- M44: 26,833,669 km (0.028 R)
- M45: 27,297,572 km (0.111 R)
- M46: 27,452,705 km (0.098 R)
- M47: 27,686,078 km (0.076 R)
- M48: 28,076,528 km (0.112 R)
- M49: 28,468,774 km (0.106 R)
- M50: 29,100,077 km (0.098 R)
- M51: 29,497,110 km (0.112 R)
- M52: 33,315,296 km (0.065 R)
- M53: 39,195,689 km (0.034 R)
- M54: 39,898,051 km (0.093 R)
- M55: 39,986,015 km (0.11 R)
- M56: 45,387,844 km (0.077 R)
- M57: 45,940,459 km (0.089 R)
- M58: 47,238,669 km (0.069 R)
- M59: 47,331,869 km (0.108 R)
- M60: 47,611,766 km (0.085 R)
- M61: 48,079,559 km (0.071 R)
- M62: 48,454,900 km (0.082 R)
- M63: 48,548,847 km (0.114 R)
- M64: 48,925,385 km (0.088 R)
- M65: 49,208,574 km (0.037 R)
- M66: 49,681,453 km (0.098 R)
- M67: 51,588,377 km (0.067 R)
- M68: 51,876,502 km (0.083 R)
- M69: 53,810,803 km (0.09 R)
- M70: 54,395,731 km (0.117 R)
- M71: 54,591,255 km (0.117 R)
- M72: 56,657,351 km (0.108 R)
- M73: 57,053,786 km (0.1 R)
- M74: 59,653,198 km (0.101 R)
- M75: 60,258,621 km (0.04 R)
- M76: 61,678,903 km (0.025 R)
- M77: 62,291,057 km (0.085 R)
- M78: 63,624,274 km (0.113 R)
- M79: 63,727,197 km (0.097 R)
- M80: 66,422,951 km (0.098 R)
- M81: 70,004,174 km (0.088 R)
- M82: 70,429,630 km (0.117 R)
- M83: 71,069,460 km (0.059 R)
- M84: 71,283,086 km (0.041 R)
Planet 9 - Ice Giant
Semi-Major Axis: 13.51 AU
Status: Outer (Cold)
Composition: Methane/Ammonia Ices
Physical Data
Mass: 448.7
Radius: 3.6
Gravity: 34.62 G
Time & Orbit
Eccentricity (e): 0.128
Orbit Range: 11.78 AU - 15.24 AU
Year: 17871 Days
Day: 23.9 Hours
Environment
Temp: -185 °C
Axial Tilt: 16.3 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (95)
Outer Limit: 61,304,411 km
- M1: 97,089 km (0.094 R)
- M2: 157,377 km (0.088 R)
- M3: 205,248 km (0.116 R)
- M4: 258,505 km (0.097 R)
- M5: 286,929 km (0.118 R)
- M6: 316,549 km (0.105 R)
- M7: 428,897 km (0.049 R)
- M8: 480,808 km (0.096 R)
- M9: 689,048 km (0.112 R)
- M10: 1,083,537 km (0.107 R)
- M11: 1,155,045 km (0.05 R)
- M12: 1,698,833 km (0.09 R)
- M13: 2,752,152 km (0.114 R)
- M14: 3,117,171 km (0.116 R)
- M15: 3,568,059 km (0.108 R)
- M16: 3,710,925 km (0.104 R)
- M17: 4,300,789 km (0.094 R)
- M18: 4,414,633 km (0.099 R)
- M19: 5,360,391 km (0.106 R)
- M20: 5,442,071 km (0.103 R)
- M21: 6,366,137 km (0.104 R)
- M22: 6,452,455 km (0.063 R)
- M23: 7,656,269 km (0.116 R)
- M24: 7,886,800 km (0.099 R)
- M25: 8,354,443 km (0.099 R)
- M26: 8,401,566 km (0.062 R)
- M27: 8,496,411 km (0.113 R)
- M28: 8,734,870 km (0.12 R)
- M29: 8,975,573 km (0.078 R)
- M30: 10,010,192 km (0.115 R)
- M31: 10,110,722 km (0.104 R)
- M32: 11,394,870 km (0.107 R)
- M33: 12,029,314 km (0.038 R)
- M34: 13,221,759 km (0.113 R)
- M35: 13,332,013 km (0.116 R)
- M36: 13,999,967 km (0.027 R)
- M37: 14,056,216 km (0.088 R)
- M38: 14,735,839 km (0.099 R)
- M39: 15,022,319 km (0.037 R)
- M40: 15,542,321 km (0.068 R)
- M41: 15,775,395 km (0.067 R)
- M42: 16,838,288 km (0.117 R)
- M43: 17,438,773 km (0.113 R)
- M44: 17,620,236 km (0.093 R)
- M45: 19,532,096 km (0.096 R)
- M46: 20,353,239 km (0.111 R)
- M47: 21,898,585 km (0.107 R)
- M48: 22,029,034 km (0.11 R)
- M49: 22,422,028 km (0.06 R)
- M50: 22,685,171 km (0.067 R)
- M51: 24,353,636 km (0.114 R)
- M52: 24,556,490 km (0.099 R)
- M53: 25,305,078 km (0.074 R)
- M54: 26,130,260 km (0.06 R)
- M55: 26,685,268 km (0.107 R)
- M56: 27,034,130 km (0.07 R)
- M57: 27,314,327 km (0.084 R)
- M58: 28,586,956 km (0.09 R)
- M59: 29,806,478 km (0.08 R)
- M60: 29,950,990 km (0.077 R)
- M61: 30,023,395 km (0.05 R)
- M62: 30,313,465 km (0.113 R)
- M63: 32,965,985 km (0.115 R)
- M64: 33,791,167 km (0.055 R)
- M65: 33,941,962 km (0.114 R)
- M66: 34,319,846 km (0.116 R)
- M67: 34,699,226 km (0.067 R)
- M68: 36,153,168 km (0.069 R)
- M69: 36,693,815 km (0.094 R)
- M70: 36,926,290 km (0.095 R)
- M71: 37,237,154 km (0.094 R)
- M72: 37,314,945 km (0.083 R)
- M73: 38,725,204 km (0.083 R)
- M74: 38,883,030 km (0.073 R)
- M75: 39,675,001 km (0.04 R)
- M76: 39,913,609 km (0.086 R)
- M77: 41,678,416 km (0.102 R)
- M78: 44,207,816 km (0.119 R)
- M79: 45,615,832 km (0.104 R)
- M80: 48,390,872 km (0.089 R)
- M81: 48,645,787 km (0.067 R)
- M82: 49,242,533 km (0.057 R)
- M83: 50,184,999 km (0.034 R)
- M84: 50,443,056 km (0.083 R)
- M85: 50,529,224 km (0.116 R)
- M86: 50,874,197 km (0.071 R)
- M87: 51,826,986 km (0.106 R)
- M88: 53,048,153 km (0.1 R)
- M89: 54,543,533 km (0.087 R)
- M90: 55,607,473 km (0.107 R)
- M91: 57,485,824 km (0.119 R)
- M92: 57,575,882 km (0.111 R)
- M93: 57,846,056 km (0.083 R)
- M94: 58,930,940 km (0.111 R)
- M95: 59,840,046 km (0.108 R)
Kuiper Belt
Range: 30.5 - 57.5 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 162 - 11,908 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.