Star System Generated (Seed: 1766929293)
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: 0.57 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 568.6
Radius: 10.5
Gravity: 5.16 G
Time & Orbit
Eccentricity (e): 0.242
Orbit Range: 0.43 AU - 0.71 AU
Year: 292 Days
Day: 9.2 Hours
Environment
Temp: -140 °C
Axial Tilt: 38.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (41)
Outer Limit: 49,269,767 km
- M1: 132,095 km (0.085 R)
- M2: 205,547 km (0.056 R)
- M3: 315,801 km (0.108 R)
- M4: 392,994 km (0.118 R)
- M5: 460,013 km (0.103 R)
- M6: 537,505 km (0.101 R)
- M7: 605,273 km (0.114 R)
- M8: 717,920 km (0.092 R)
- M9: 790,475 km (0.055 R)
- M10: 944,112 km (0.093 R)
- M11: 1,013,675 km (0.066 R)
- M12: 1,111,811 km (0.075 R)
- M13: 1,185,713 km (0.087 R)
- M14: 1,318,256 km (0.112 R)
- M15: 1,401,134 km (0.112 R)
- M16: 1,515,875 km (0.059 R)
- M17: 1,589,926 km (0.081 R)
- M18: 1,696,440 km (0.067 R)
- M19: 1,809,985 km (0.115 R)
- M20: 1,884,036 km (0.09 R)
- M21: 1,959,283 km (0.105 R)
- M22: 2,064,301 km (0.089 R)
- M23: 2,205,671 km (0.118 R)
- M24: 2,315,177 km (0.083 R)
- M25: 2,405,983 km (0.066 R)
- M26: 2,508,607 km (0.079 R)
- M27: 2,591,634 km (0.111 R)
- M28: 2,792,693 km (0.107 R)
- M29: 2,873,476 km (0.083 R)
- M30: 3,020,979 km (0.116 R)
- M31: 3,092,786 km (0.119 R)
- M32: 3,187,781 km (0.076 R)
- M33: 3,261,084 km (0.108 R)
- M34: 3,363,409 km (0.038 R)
- M35: 3,478,450 km (0.09 R)
- M36: 3,583,168 km (0.112 R)
- M37: 3,783,779 km (0.098 R)
- M38: 3,879,522 km (0.105 R)
- M39: 3,981,996 km (0.088 R)
- M40: 4,085,518 km (0.099 R)
- M41: 4,183,804 km (0.078 R)
Planet 2 - Gas Giant
Semi-Major Axis: 0.6 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 378.4
Radius: 13.2
Gravity: 2.17 G
Time & Orbit
Eccentricity (e): 0.067
Orbit Range: 0.56 AU - 0.64 AU
Year: 315 Days
Day: 7.7 Hours
Environment
Temp: -142 °C
Axial Tilt: 25.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (30)
Outer Limit: 49,269,767 km
- M1: 165,455 km (0.065 R)
- M2: 255,663 km (0.102 R)
- M3: 367,562 km (0.119 R)
- M4: 458,517 km (0.088 R)
- M5: 565,480 km (0.098 R)
- M6: 677,080 km (0.09 R)
- M7: 785,090 km (0.112 R)
- M8: 906,413 km (0.087 R)
- M9: 1,031,178 km (0.051 R)
- M10: 1,147,715 km (0.071 R)
- M11: 1,291,778 km (0.066 R)
- M12: 1,481,767 km (0.082 R)
- M13: 1,606,980 km (0.053 R)
- M14: 1,710,652 km (0.09 R)
- M15: 1,803,851 km (0.116 R)
- M16: 1,955,693 km (0.109 R)
- M17: 2,084,946 km (0.06 R)
- M18: 2,194,302 km (0.116 R)
- M19: 2,291,391 km (0.081 R)
- M20: 2,418,698 km (0.109 R)
- M21: 2,592,082 km (0.094 R)
- M22: 2,719,839 km (0.093 R)
- M23: 2,839,816 km (0.099 R)
- M24: 2,930,921 km (0.052 R)
- M25: 3,043,718 km (0.082 R)
- M26: 3,205,134 km (0.081 R)
- M27: 3,310,900 km (0.119 R)
- M28: 3,569,405 km (0.115 R)
- M29: 3,690,280 km (0.096 R)
- M30: 3,795,597 km (0.109 R)
Planet 3 - Gas Giant
Semi-Major Axis: 0.68 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 201.5
Radius: 11.4
Gravity: 1.55 G
Time & Orbit
Eccentricity (e): 0.032
Orbit Range: 0.66 AU - 0.7 AU
Year: 380 Days
Day: 12.7 Hours
Environment
Temp: -163 °C
Axial Tilt: 33.4 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (34)
Outer Limit: 49,269,767 km
- M1: 148,850 km (0.117 R)
- M2: 223,050 km (0.087 R)
- M3: 300,393 km (0.091 R)
- M4: 380,278 km (0.073 R)
- M5: 467,942 km (0.081 R)
- M6: 538,852 km (0.027 R)
- M7: 614,249 km (0.041 R)
- M8: 708,047 km (0.078 R)
- M9: 789,428 km (0.091 R)
- M10: 865,124 km (0.065 R)
- M11: 1,094,608 km (0.054 R)
- M12: 1,176,886 km (0.095 R)
- M13: 1,279,211 km (0.062 R)
- M14: 1,366,277 km (0.053 R)
- M15: 1,463,067 km (0.084 R)
- M16: 1,546,842 km (0.065 R)
- M17: 1,640,041 km (0.103 R)
- M18: 1,715,289 km (0.093 R)
- M19: 1,799,962 km (0.097 R)
- M20: 1,877,752 km (0.111 R)
- M21: 1,982,022 km (0.117 R)
- M22: 2,122,495 km (0.071 R)
- M23: 2,266,557 km (0.061 R)
- M24: 2,355,418 km (0.115 R)
- M25: 2,432,013 km (0.109 R)
- M26: 2,559,919 km (0.106 R)
- M27: 2,647,882 km (0.104 R)
- M28: 2,737,043 km (0.063 R)
- M29: 2,860,760 km (0.11 R)
- M30: 2,932,866 km (0.065 R)
- M31: 3,089,046 km (0.08 R)
- M32: 3,193,017 km (0.092 R)
- M33: 3,486,378 km (0.096 R)
- M34: 3,579,279 km (0.112 R)
Asteroid Belt
Center: 1.34 AU
Composition
Type: Outer System (Icy)
A dense region of planetesimals and debris.
Boundary
Planet 4 - Gas Giant
Semi-Major Axis: 1.99 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 644.6
Radius: 9.9
Gravity: 6.58 G
Time & Orbit
Eccentricity (e): 0.197
Orbit Range: 1.6 AU - 2.38 AU
Year: 1904 Days
Day: 7 Hours
Environment
Temp: -197 °C
Axial Tilt: 35.9 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (75)
Outer Limit: 49,269,767 km
- M1: 136,284 km (0.12 R)
- M2: 232,924 km (0.047 R)
- M3: 344,075 km (0.07 R)
- M4: 472,131 km (0.08 R)
- M5: 546,481 km (0.119 R)
- M6: 640,428 km (0.101 R)
- M7: 1,010,085 km (0.11 R)
- M8: 1,119,441 km (0.108 R)
- M9: 1,523,355 km (0.084 R)
- M10: 1,607,280 km (0.062 R)
- M11: 2,120,849 km (0.117 R)
- M12: 2,371,575 km (0.092 R)
- M13: 2,469,711 km (0.115 R)
- M14: 2,556,628 km (0.059 R)
- M15: 2,657,307 km (0.105 R)
- M16: 2,733,751 km (0.115 R)
- M17: 2,901,899 km (0.067 R)
- M18: 2,980,588 km (0.09 R)
- M19: 3,046,860 km (0.072 R)
- M20: 3,357,724 km (0.105 R)
- M21: 3,454,364 km (0.089 R)
- M22: 3,608,301 km (0.103 R)
- M23: 3,850,500 km (0.066 R)
- M24: 3,966,438 km (0.063 R)
- M25: 4,054,102 km (0.094 R)
- M26: 4,381,123 km (0.109 R)
- M27: 4,593,851 km (0.113 R)
- M28: 4,670,595 km (0.065 R)
- M29: 4,794,313 km (0.083 R)
- M30: 4,934,785 km (0.089 R)
- M31: 5,300,103 km (0.092 R)
- M32: 5,364,580 km (0.068 R)
- M33: 5,429,356 km (0.089 R)
- M34: 5,494,281 km (0.119 R)
- M35: 5,707,308 km (0.107 R)
- M36: 5,839,702 km (0.111 R)
- M37: 6,226,114 km (0.045 R)
- M38: 6,328,289 km (0.111 R)
- M39: 6,413,859 km (0.068 R)
- M40: 6,534,435 km (0.117 R)
- M41: 6,988,465 km (0.116 R)
- M42: 7,183,690 km (0.032 R)
- M43: 7,308,903 km (0.084 R)
- M44: 7,634,129 km (0.047 R)
- M45: 7,853,589 km (0.11 R)
- M46: 7,927,191 km (0.077 R)
- M47: 8,261,393 km (0.097 R)
- M48: 8,355,041 km (0.117 R)
- M49: 8,448,989 km (0.062 R)
- M50: 8,524,535 km (0.095 R)
- M51: 8,771,222 km (0.076 R)
- M52: 9,059,049 km (0.094 R)
- M53: 9,174,987 km (0.083 R)
- M54: 9,447,554 km (0.043 R)
- M55: 9,584,736 km (0.087 R)
- M56: 9,821,699 km (0.098 R)
- M57: 9,980,572 km (0.101 R)
- M58: 10,260,918 km (0.102 R)
- M59: 10,482,921 km (0.044 R)
- M60: 10,747,410 km (0.073 R)
- M61: 11,096,721 km (0.075 R)
- M62: 11,449,623 km (0.073 R)
- M63: 12,081,524 km (0.039 R)
- M64: 12,294,701 km (0.074 R)
- M65: 12,573,701 km (0.101 R)
- M66: 12,724,795 km (0.119 R)
- M67: 12,854,795 km (0.118 R)
- M68: 12,985,245 km (0.107 R)
- M69: 13,555,512 km (0.108 R)
- M70: 13,843,787 km (0.112 R)
- M71: 14,607,185 km (0.12 R)
- M72: 14,766,058 km (0.069 R)
- M73: 14,834,274 km (0.076 R)
- M74: 15,269,006 km (0.105 R)
- M75: 15,384,196 km (0.12 R)
Planet 5 - Gas Giant
Semi-Major Axis: 2.04 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 457.1
Radius: 10.9
Gravity: 3.85 G
Time & Orbit
Eccentricity (e): 0.065
Orbit Range: 1.91 AU - 2.17 AU
Year: 1976 Days
Day: 9.2 Hours
Environment
Temp: -198 °C
Axial Tilt: 33.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (62)
Outer Limit: 49,269,767 km
- M1: 139,126 km (0.117 R)
- M2: 327,171 km (0.115 R)
- M3: 454,030 km (0.094 R)
- M4: 554,260 km (0.08 R)
- M5: 825,930 km (0.086 R)
- M6: 928,853 km (0.066 R)
- M7: 1,028,037 km (0.076 R)
- M8: 1,201,570 km (0.051 R)
- M9: 1,282,951 km (0.09 R)
- M10: 1,519,316 km (0.089 R)
- M11: 1,688,212 km (0.116 R)
- M12: 1,937,442 km (0.089 R)
- M13: 2,232,150 km (0.062 R)
- M14: 2,322,357 km (0.084 R)
- M15: 2,390,873 km (0.066 R)
- M16: 2,576,823 km (0.109 R)
- M17: 2,659,701 km (0.073 R)
- M18: 2,731,508 km (0.08 R)
- M19: 2,938,401 km (0.098 R)
- M20: 3,303,420 km (0.082 R)
- M21: 3,458,852 km (0.087 R)
- M22: 3,776,897 km (0.08 R)
- M23: 3,885,057 km (0.054 R)
- M24: 4,076,841 km (0.11 R)
- M25: 5,127,018 km (0.064 R)
- M26: 5,337,652 km (0.06 R)
- M27: 5,643,580 km (0.071 R)
- M28: 5,783,154 km (0.092 R)
- M29: 6,034,180 km (0.077 R)
- M30: 6,145,181 km (0.101 R)
- M31: 6,224,767 km (0.059 R)
- M32: 6,612,076 km (0.112 R)
- M33: 6,924,137 km (0.053 R)
- M34: 7,073,735 km (0.079 R)
- M35: 7,224,380 km (0.092 R)
- M36: 7,376,073 km (0.084 R)
- M37: 7,528,962 km (0.098 R)
- M38: 7,682,748 km (0.109 R)
- M39: 7,768,617 km (0.062 R)
- M40: 7,889,493 km (0.106 R)
- M41: 8,028,319 km (0.035 R)
- M42: 8,168,044 km (0.059 R)
- M43: 8,379,126 km (0.118 R)
- M44: 9,095,700 km (0.091 R)
- M45: 9,186,656 km (0.113 R)
- M46: 9,351,213 km (0.087 R)
- M47: 9,590,570 km (0.092 R)
- M48: 9,794,621 km (0.095 R)
- M49: 9,887,970 km (0.11 R)
- M50: 10,019,018 km (0.071 R)
- M51: 10,112,966 km (0.047 R)
- M52: 10,226,211 km (0.108 R)
- M53: 11,049,448 km (0.086 R)
- M54: 11,244,075 km (0.115 R)
- M55: 11,814,641 km (0.043 R)
- M56: 12,053,549 km (0.083 R)
- M57: 12,334,344 km (0.106 R)
- M58: 12,596,889 km (0.088 R)
- M59: 13,066,028 km (0.085 R)
- M60: 13,375,246 km (0.039 R)
- M61: 13,478,768 km (0.111 R)
- M62: 14,063,696 km (0.066 R)
Planet 6 - Gas Giant
Semi-Major Axis: 4.73 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 558.2
Radius: 12.6
Gravity: 3.52 G
Time & Orbit
Eccentricity (e): 0.151
Orbit Range: 4.02 AU - 5.44 AU
Year: 6977 Days
Day: 7.1 Hours
Environment
Temp: -217 °C
Axial Tilt: 23.2 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (80)
Outer Limit: 49,269,767 km
- M1: 234,420 km (0.098 R)
- M2: 329,863 km (0.095 R)
- M3: 426,803 km (0.059 R)
- M4: 514,018 km (0.093 R)
- M5: 633,846 km (0.113 R)
- M6: 834,158 km (0.066 R)
- M7: 1,041,052 km (0.061 R)
- M8: 2,112,771 km (0.078 R)
- M9: 2,358,859 km (0.118 R)
- M10: 2,614,372 km (0.046 R)
- M11: 2,834,431 km (0.043 R)
- M12: 3,152,775 km (0.084 R)
- M13: 3,435,066 km (0.106 R)
- M14: 3,999,050 km (0.101 R)
- M15: 4,227,785 km (0.1 R)
- M16: 4,461,009 km (0.105 R)
- M17: 4,565,877 km (0.086 R)
- M18: 4,858,939 km (0.085 R)
- M19: 4,939,871 km (0.086 R)
- M20: 5,130,758 km (0.117 R)
- M21: 5,323,889 km (0.03 R)
- M22: 5,407,514 km (0.057 R)
- M23: 5,519,563 km (0.116 R)
- M24: 5,689,207 km (0.106 R)
- M25: 5,975,837 km (0.063 R)
- M26: 6,773,492 km (0.065 R)
- M27: 7,169,478 km (0.1 R)
- M28: 8,144,258 km (0.034 R)
- M29: 8,467,688 km (0.098 R)
- M30: 8,598,138 km (0.11 R)
- M31: 9,093,755 km (0.043 R)
- M32: 9,429,154 km (0.036 R)
- M33: 9,940,180 km (0.052 R)
- M34: 10,285,901 km (0.113 R)
- M35: 10,635,511 km (0.106 R)
- M36: 11,707,978 km (0.086 R)
- M37: 11,999,844 km (0.112 R)
- M38: 12,442,055 km (0.109 R)
- M39: 12,590,606 km (0.101 R)
- M40: 12,777,304 km (0.048 R)
- M41: 13,153,243 km (0.076 R)
- M42: 13,418,630 km (0.076 R)
- M43: 13,723,959 km (0.099 R)
- M44: 13,954,639 km (0.104 R)
- M45: 15,087,244 km (0.112 R)
- M46: 15,206,175 km (0.091 R)
- M47: 15,564,611 km (0.112 R)
- M48: 16,168,239 km (0.099 R)
- M49: 16,289,862 km (0.116 R)
- M50: 16,656,676 km (0.098 R)
- M51: 17,232,777 km (0.04 R)
- M52: 17,481,708 km (0.091 R)
- M53: 17,857,199 km (0.101 R)
- M54: 18,025,047 km (0.057 R)
- M55: 19,644,893 km (0.106 R)
- M56: 20,297,140 km (0.089 R)
- M57: 21,846,525 km (0.103 R)
- M58: 21,981,163 km (0.046 R)
- M59: 22,431,752 km (0.119 R)
- M60: 22,658,243 km (0.054 R)
- M61: 23,204,724 km (0.1 R)
- M62: 23,617,614 km (0.1 R)
- M63: 24,125,349 km (0.112 R)
- M64: 24,311,000 km (0.078 R)
- M65: 24,776,998 km (0.117 R)
- M66: 25,198,864 km (0.103 R)
- M67: 25,954,782 km (0.106 R)
- M68: 26,622,437 km (0.063 R)
- M69: 29,497,409 km (0.102 R)
- M70: 30,494,329 km (0.054 R)
- M71: 30,745,205 km (0.09 R)
- M72: 31,148,072 km (0.1 R)
- M73: 31,451,456 km (0.029 R)
- M74: 31,755,738 km (0.032 R)
- M75: 32,061,068 km (0.04 R)
- M76: 33,034,351 km (0.109 R)
- M77: 33,705,747 km (0.108 R)
- M78: 34,069,269 km (0.071 R)
- M79: 34,225,450 km (0.096 R)
- M80: 34,695,337 km (0.099 R)
Planet 7 - Gas Giant
Semi-Major Axis: 5.63 AU
Status: Outer (Cold)
Composition: Hydrogen/Helium Atmosphere
Physical Data
Mass: 906.2
Radius: 9
Gravity: 11.19 G
Time & Orbit
Eccentricity (e): 0.051
Orbit Range: 5.34 AU - 5.92 AU
Year: 9061 Days
Day: 9.2 Hours
Environment
Temp: -223 °C
Axial Tilt: 39.6 °
Atmosphere: Hâ‚‚, CHâ‚„
Biome: None
Satellites (90)
Outer Limit: 49,269,767 km
- M1: 184,753 km (0.107 R)
- M2: 261,497 km (0.106 R)
- M3: 694,882 km (0.084 R)
- M4: 926,609 km (0.044 R)
- M5: 1,061,696 km (0.061 R)
- M6: 1,351,766 km (0.054 R)
- M7: 1,760,617 km (0.091 R)
- M8: 1,880,894 km (0.066 R)
- M9: 1,954,496 km (0.032 R)
- M10: 2,079,261 km (0.064 R)
- M11: 2,659,401 km (0.094 R)
- M12: 2,826,203 km (0.076 R)
- M13: 2,939,299 km (0.112 R)
- M14: 3,406,643 km (0.112 R)
- M15: 3,834,792 km (0.079 R)
- M16: 3,928,739 km (0.105 R)
- M17: 4,247,532 km (0.09 R)
- M18: 4,741,505 km (0.025 R)
- M19: 5,253,877 km (0.097 R)
- M20: 5,393,452 km (0.094 R)
- M21: 5,534,224 km (0.071 R)
- M22: 6,000,371 km (0.112 R)
- M23: 6,183,030 km (0.111 R)
- M24: 7,278,535 km (0.101 R)
- M25: 8,596,642 km (0.113 R)
- M26: 9,219,866 km (0.09 R)
- M27: 9,388,463 km (0.083 R)
- M28: 9,558,107 km (0.116 R)
- M29: 9,686,163 km (0.063 R)
- M30: 10,334,371 km (0.079 R)
- M31: 10,730,057 km (0.055 R)
- M32: 11,175,559 km (0.09 R)
- M33: 11,536,240 km (0.109 R)
- M34: 11,672,523 km (0.09 R)
- M35: 11,992,513 km (0.086 R)
- M36: 12,969,986 km (0.062 R)
- M37: 13,111,805 km (0.076 R)
- M38: 13,828,079 km (0.12 R)
- M39: 14,215,388 km (0.111 R)
- M40: 14,459,233 km (0.054 R)
- M41: 14,704,573 km (0.102 R)
- M42: 15,900,907 km (0.06 R)
- M43: 16,001,886 km (0.083 R)
- M44: 16,612,993 km (0.079 R)
- M45: 16,921,464 km (0.101 R)
- M46: 17,335,700 km (0.106 R)
- M47: 17,596,300 km (0.096 R)
- M48: 18,864,890 km (0.107 R)
- M49: 19,510,405 km (0.086 R)
- M50: 19,672,868 km (0.089 R)
- M51: 19,781,326 km (0.117 R)
- M52: 20,217,703 km (0.035 R)
- M53: 21,489,585 km (0.044 R)
- M54: 21,881,830 km (0.105 R)
- M55: 22,219,921 km (0.097 R)
- M56: 23,589,639 km (0.105 R)
- M57: 24,110,240 km (0.064 R)
- M58: 26,350,019 km (0.117 R)
- M59: 27,798,576 km (0.086 R)
- M60: 28,840,076 km (0.105 R)
- M61: 29,894,442 km (0.062 R)
- M62: 30,394,996 km (0.117 R)
- M63: 33,391,292 km (0.046 R)
- M64: 33,845,471 km (0.109 R)
- M65: 34,236,520 km (0.113 R)
- M66: 34,694,589 km (0.113 R)
- M67: 35,947,920 km (0.095 R)
- M68: 36,346,897 km (0.105 R)
- M69: 36,747,221 km (0.117 R)
- M70: 37,350,549 km (0.104 R)
- M71: 38,227,791 km (0.108 R)
- M72: 38,431,244 km (0.095 R)
- M73: 38,839,198 km (0.025 R)
- M74: 39,453,746 km (0.092 R)
- M75: 39,727,809 km (0.059 R)
- M76: 40,900,058 km (0.098 R)
- M77: 41,108,148 km (0.066 R)
- M78: 41,525,227 km (0.118 R)
- M79: 41,804,078 km (0.098 R)
- M80: 42,083,676 km (0.038 R)
- M81: 43,278,365 km (0.043 R)
- M82: 43,773,683 km (0.083 R)
- M83: 44,199,588 km (0.032 R)
- M84: 44,769,706 km (0.043 R)
- M85: 44,984,080 km (0.032 R)
- M86: 45,198,902 km (0.082 R)
- M87: 45,773,208 km (0.119 R)
- M88: 46,422,314 km (0.072 R)
- M89: 47,802,504 km (0.105 R)
- M90: 48,167,822 km (0.086 R)
Kuiper Belt
Range: 30 - 58 AU
Composition
Type: Dwarf Planets/TNOs (Ices)
Reservoir of dwarf planets and volatile ices.
Outer System
Oort Cloud
Range: 468 - 13,906 AU
Composition
Type: Cometary Reservoir
System's final boundary, containing trillions of icy planetesimals.