🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.56 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.95

Radius: 1.9

Gravity: 1.37 G

Time & Orbit

Eccentricity (e): 0.058

Orbit Range: 0.53 AU - 0.59 AU

Year: 275 Days

Day: 39.3 Hours

Environment

Temp: -122 °C

Axial Tilt: 3.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 64,667,883 km

• M1: 667,805 km (0.081 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.65 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.19

Radius: 1.77

Gravity: 1.34 G

Time & Orbit

Eccentricity (e): 0.162

Orbit Range: 0.54 AU - 0.76 AU

Year: 344 Days

Day: 36 Hours

Environment

Temp: -124 °C

Axial Tilt: 21.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 64,667,883 km

• M1: 614,099 km (0.117 R)

Planet 3 - Gas Giant

Semi-Major Axis: 0.94 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 543.4

Radius: 13.4

Gravity: 3.03 G

Time & Orbit

Eccentricity (e): 0.118

Orbit Range: 0.83 AU - 1.05 AU

Year: 598 Days

Day: 14.2 Hours

Environment

Temp: -151 °C

Axial Tilt: 39.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (45)

Outer Limit: 64,667,883 km

• M1: 170,542 km (0.084 R)
• M2: 363,523 km (0.108 R)
• M3: 455,675 km (0.094 R)
• M4: 562,638 km (0.063 R)
• M5: 697,575 km (0.113 R)
• M6: 780,901 km (0.077 R)
• M7: 920,476 km (0.091 R)
• M8: 1,023,848 km (0.084 R)
• M9: 1,243,158 km (0.074 R)
• M10: 1,353,412 km (0.055 R)
• M11: 1,438,384 km (0.106 R)
• M12: 1,531,134 km (0.103 R)
• M13: 1,704,668 km (0.112 R)
• M14: 1,809,536 km (0.027 R)
• M15: 1,923,081 km (0.118 R)
• M16: 2,058,766 km (0.097 R)
• M17: 2,285,407 km (0.052 R)
• M18: 2,388,031 km (0.115 R)
• M19: 2,471,357 km (0.103 R)
• M20: 2,612,428 km (0.117 R)
• M21: 2,727,319 km (0.111 R)
• M22: 3,014,547 km (0.072 R)
• M23: 3,173,420 km (0.118 R)
• M24: 3,311,798 km (0.111 R)
• M25: 3,467,978 km (0.115 R)
• M26: 3,714,964 km (0.118 R)
• M27: 3,804,124 km (0.118 R)
• M28: 4,034,056 km (0.107 R)
• M29: 4,125,760 km (0.092 R)
• M30: 4,268,775 km (0.101 R)
• M31: 4,534,012 km (0.114 R)
• M32: 4,638,132 km (0.104 R)
• M33: 4,848,766 km (0.109 R)
• M34: 4,937,478 km (0.111 R)
• M35: 5,035,764 km (0.106 R)
• M36: 5,252,381 km (0.072 R)
• M37: 5,416,939 km (0.09 R)
• M38: 5,509,091 km (0.071 R)
• M39: 5,648,367 km (0.089 R)
• M40: 5,760,565 km (0.106 R)
• M41: 5,892,511 km (0.119 R)
• M42: 6,025,353 km (0.089 R)
• M43: 6,342,800 km (0.12 R)
• M44: 6,518,129 km (0.12 R)
• M45: 6,784,413 km (0.037 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.38 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 145.1

Radius: 14.4

Gravity: 0.7 G

Time & Orbit

Eccentricity (e): 0.165

Orbit Range: 1.15 AU - 1.61 AU

Year: 1063 Days

Day: 7.7 Hours

Environment

Temp: -181 °C

Axial Tilt: 36.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (33)

Outer Limit: 64,667,883 km

• M1: 195,375 km (0.094 R)
• M2: 299,495 km (0.05 R)
• M3: 409,599 km (0.063 R)
• M4: 516,262 km (0.03 R)
• M5: 647,310 km (0.083 R)
• M6: 774,767 km (0.105 R)
• M7: 893,847 km (0.112 R)
• M8: 1,078,152 km (0.079 R)
• M9: 1,250,040 km (0.027 R)
• M10: 1,442,423 km (0.119 R)
• M11: 1,628,074 km (0.092 R)
• M12: 1,967,810 km (0.068 R)
• M13: 2,117,857 km (0.102 R)
• M14: 2,245,913 km (0.102 R)
• M15: 2,463,129 km (0.103 R)
• M16: 2,756,939 km (0.057 R)
• M17: 2,862,106 km (0.119 R)
• M18: 3,156,665 km (0.108 R)
• M19: 3,386,148 km (0.115 R)
• M20: 3,575,389 km (0.071 R)
• M21: 3,667,392 km (0.087 R)
• M22: 3,846,161 km (0.109 R)
• M23: 4,228,683 km (0.117 R)
• M24: 4,375,289 km (0.115 R)
• M25: 4,615,094 km (0.094 R)
• M26: 4,774,715 km (0.085 R)
• M27: 5,064,935 km (0.104 R)
• M28: 5,255,822 km (0.094 R)
• M29: 5,484,557 km (0.091 R)
• M30: 5,671,704 km (0.066 R)
• M31: 5,788,690 km (0.045 R)
• M32: 6,172,109 km (0.111 R)
• M33: 6,413,710 km (0.084 R)

Planet 5 - Gas Giant

Semi-Major Axis: 4.94 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 142.8

Radius: 12.9

Gravity: 0.86 G

Time & Orbit

Eccentricity (e): 0.122

Orbit Range: 4.34 AU - 5.54 AU

Year: 7203 Days

Day: 11.6 Hours

Environment

Temp: -223 °C

Axial Tilt: 32.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (67)

Outer Limit: 64,667,883 km

• M1: 272,418 km (0.074 R)
• M2: 406,457 km (0.052 R)
• M3: 732,282 km (0.104 R)
• M4: 834,906 km (0.07 R)
• M5: 1,033,272 km (0.033 R)
• M6: 1,247,945 km (0.079 R)
• M7: 1,399,638 km (0.076 R)
• M8: 1,491,042 km (0.107 R)
• M9: 1,611,767 km (0.11 R)
• M10: 1,722,021 km (0.077 R)
• M11: 1,906,625 km (0.084 R)
• M12: 2,053,380 km (0.113 R)
• M13: 2,249,802 km (0.12 R)
• M14: 2,421,092 km (0.071 R)
• M15: 2,678,101 km (0.068 R)
• M16: 3,097,723 km (0.089 R)
• M17: 3,359,669 km (0.093 R)
• M18: 3,793,802 km (0.078 R)
• M19: 3,923,952 km (0.078 R)
• M20: 4,036,599 km (0.092 R)
• M21: 4,246,186 km (0.057 R)
• M22: 4,997,616 km (0.042 R)
• M23: 5,099,492 km (0.106 R)
• M24: 5,264,199 km (0.117 R)
• M25: 5,641,037 km (0.076 R)
• M26: 6,201,131 km (0.101 R)
• M27: 6,310,786 km (0.12 R)
• M28: 6,733,849 km (0.099 R)
• M29: 7,028,706 km (0.101 R)
• M30: 7,212,263 km (0.105 R)
• M31: 7,514,002 km (0.112 R)
• M32: 7,890,988 km (0.11 R)
• M33: 8,153,832 km (0.109 R)
• M34: 8,517,056 km (0.102 R)
• M35: 9,133,997 km (0.111 R)
• M36: 9,284,343 km (0.096 R)
• M37: 9,536,565 km (0.095 R)
• M38: 9,740,018 km (0.112 R)
• M39: 9,970,698 km (0.065 R)
• M40: 10,073,771 km (0.048 R)
• M41: 10,594,521 km (0.08 R)
• M42: 10,699,689 km (0.118 R)
• M43: 11,097,469 km (0.07 R)
• M44: 11,365,249 km (0.078 R)
• M45: 12,236,657 km (0.117 R)
• M46: 13,469,942 km (0.1 R)
• M47: 13,555,512 km (0.1 R)
• M48: 13,755,674 km (0.054 R)
• M49: 13,841,842 km (0.115 R)
• M50: 14,362,443 km (0.108 R)
• M51: 14,625,137 km (0.096 R)
• M52: 15,244,472 km (0.058 R)
• M53: 16,356,283 km (0.107 R)
• M54: 16,661,313 km (0.078 R)
• M55: 16,814,501 km (0.042 R)
• M56: 17,060,590 km (0.07 R)
• M57: 17,837,452 km (0.094 R)
• M58: 17,931,399 km (0.048 R)
• M59: 18,435,544 km (0.07 R)
• M60: 18,784,855 km (0.105 R)
• M61: 18,976,340 km (0.106 R)
• M62: 20,465,587 km (0.11 R)
• M63: 20,827,315 km (0.102 R)
• M64: 21,158,076 km (0.043 R)
• M65: 21,590,563 km (0.07 R)
• M66: 22,160,531 km (0.056 R)
• M67: 22,769,394 km (0.107 R)

Planet 6 - Ice Giant

Semi-Major Axis: 6.78 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 160.9

Radius: 3.9

Gravity: 10.58 G

Time & Orbit

Eccentricity (e): 0.232

Orbit Range: 5.21 AU - 8.35 AU

Year: 11581 Days

Day: 17.4 Hours

Environment

Temp: -223 °C

Axial Tilt: 31.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 64,667,883 km

• M1: 154,834 km (0.119 R)
• M2: 359,334 km (0.1 R)
• M3: 468,541 km (0.063 R)
• M4: 527,183 km (0.066 R)
• M5: 827,276 km (0.045 R)
• M6: 972,087 km (0.081 R)
• M7: 1,220,419 km (0.107 R)
• M8: 1,285,644 km (0.072 R)
• M9: 1,318,556 km (0.076 R)
• M10: 1,809,536 km (0.091 R)
• M11: 1,865,336 km (0.068 R)
• M12: 2,055,176 km (0.108 R)
• M13: 2,093,772 km (0.114 R)
• M14: 2,271,045 km (0.106 R)
• M15: 2,311,138 km (0.112 R)
• M16: 2,577,123 km (0.068 R)
• M17: 2,788,355 km (0.085 R)
• M18: 2,852,831 km (0.098 R)
• M19: 2,896,065 km (0.116 R)
• M20: 3,049,253 km (0.09 R)
• M21: 3,093,385 km (0.088 R)
• M22: 3,432,074 km (0.09 R)
• M23: 3,806,069 km (0.035 R)
• M24: 4,390,997 km (0.062 R)
• M25: 4,642,920 km (0.058 R)
• M26: 4,951,390 km (0.084 R)
• M27: 5,134,498 km (0.043 R)
• M28: 5,588,228 km (0.117 R)
• M29: 5,888,621 km (0.094 R)
• M30: 6,166,275 km (0.105 R)
• M31: 6,619,257 km (0.113 R)
• M32: 6,849,787 km (0.077 R)
• M33: 7,527,166 km (0.036 R)
• M34: 8,072,002 km (0.068 R)
• M35: 8,318,240 km (0.028 R)
• M36: 8,535,755 km (0.11 R)
• M37: 9,135,493 km (0.066 R)
• M38: 10,275,279 km (0.104 R)
• M39: 10,542,162 km (0.087 R)
• M40: 11,048,401 km (0.11 R)
• M41: 11,287,459 km (0.085 R)
• M42: 11,493,604 km (0.101 R)
• M43: 11,735,803 km (0.107 R)
• M44: 12,084,666 km (0.115 R)
• M45: 12,721,205 km (0.109 R)
• M46: 13,079,491 km (0.096 R)
• M47: 13,769,437 km (0.102 R)
• M48: 13,989,794 km (0.08 R)
• M49: 14,063,397 km (0.096 R)
• M50: 14,285,250 km (0.038 R)
• M51: 15,184,333 km (0.047 R)
• M52: 15,870,539 km (0.109 R)
• M53: 15,908,836 km (0.1 R)
• M54: 16,178,711 km (0.112 R)
• M55: 16,411,186 km (0.047 R)
• M56: 17,194,031 km (0.07 R)
• M57: 17,629,660 km (0.109 R)
• M58: 19,080,909 km (0.1 R)
• M59: 19,573,086 km (0.113 R)
• M60: 19,696,804 km (0.115 R)
• M61: 20,111,040 km (0.076 R)
• M62: 20,695,818 km (0.071 R)
• M63: 20,906,003 km (0.067 R)
• M64: 21,074,600 km (0.05 R)
• M65: 21,116,787 km (0.092 R)
• M66: 21,625,868 km (0.118 R)
• M67: 21,668,504 km (0.081 R)
• M68: 22,181,923 km (0.062 R)
• M69: 22,224,858 km (0.113 R)
• M70: 22,353,961 km (0.047 R)
• M71: 22,440,129 km (0.113 R)
• M72: 22,829,233 km (0.053 R)
• M73: 23,482,827 km (0.115 R)
• M74: 24,585,662 km (0.101 R)
• M75: 24,674,523 km (0.102 R)
• M76: 25,840,788 km (0.076 R)
• M77: 25,885,967 km (0.092 R)
• M78: 26,339,547 km (0.101 R)
• M79: 26,933,002 km (0.093 R)
• M80: 27,116,559 km (0.032 R)
• M81: 27,993,801 km (0.054 R)
• M82: 28,412,675 km (0.066 R)
• M83: 28,646,347 km (0.057 R)
• M84: 29,492,472 km (0.114 R)
• M85: 29,539,745 km (0.071 R)
• M86: 30,013,522 km (0.11 R)
• M87: 30,920,833 km (0.103 R)
• M88: 31,546,750 km (0.115 R)
• M89: 32,566,708 km (0.095 R)

Planet 7 - Ice Giant

Semi-Major Axis: 7.06 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 241.9

Radius: 6

Gravity: 6.72 G

Time & Orbit

Eccentricity (e): 0.01

Orbit Range: 6.99 AU - 7.13 AU

Year: 12306 Days

Day: 20.8 Hours

Environment

Temp: -227 °C

Axial Tilt: 14.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (88)

Outer Limit: 64,667,883 km

• M1: 97,388 km (0.106 R)
• M2: 228,137 km (0.094 R)
• M3: 286,630 km (0.109 R)
• M4: 408,851 km (0.067 R)
• M5: 457,769 km (0.072 R)
• M6: 617,091 km (0.12 R)
• M7: 936,931 km (0.06 R)
• M8: 1,158,187 km (0.074 R)
• M9: 1,247,796 km (0.041 R)
• M10: 1,395,898 km (0.083 R)
• M11: 1,628,672 km (0.047 R)
• M12: 1,668,764 km (0.078 R)
• M13: 1,749,697 km (0.058 R)
• M14: 1,811,481 km (0.097 R)
• M15: 1,873,863 km (0.073 R)
• M16: 2,087,040 km (0.117 R)
• M17: 2,174,555 km (0.069 R)
• M18: 2,263,266 km (0.065 R)
• M19: 2,583,256 km (0.096 R)
• M20: 2,677,353 km (0.064 R)
• M21: 2,796,433 km (0.109 R)
• M22: 3,811,604 km (0.11 R)
• M23: 4,442,010 km (0.069 R)
• M24: 4,583,380 km (0.038 R)
• M25: 4,783,691 km (0.088 R)
• M26: 5,045,637 km (0.036 R)
• M27: 5,133,900 km (0.096 R)
• M28: 5,252,531 km (0.08 R)
• M29: 5,312,071 km (0.108 R)
• M30: 5,462,267 km (0.117 R)
• M31: 6,045,250 km (0.086 R)
• M32: 6,455,447 km (0.087 R)
• M33: 6,972,607 km (0.095 R)
• M34: 7,103,954 km (0.056 R)
• M35: 7,302,620 km (0.114 R)
• M36: 8,323,027 km (0.118 R)
• M37: 8,814,307 km (0.056 R)
• M38: 9,387,266 km (0.079 R)
• M39: 9,641,732 km (0.106 R)
• M40: 10,231,896 km (0.06 R)
• M41: 10,418,744 km (0.112 R)
• M42: 10,947,871 km (0.09 R)
• M43: 10,986,019 km (0.085 R)
• M44: 11,369,737 km (0.027 R)
• M45: 11,446,930 km (0.116 R)
• M46: 11,914,274 km (0.071 R)
• M47: 12,032,157 km (0.102 R)
• M48: 12,348,107 km (0.091 R)
• M49: 12,467,337 km (0.084 R)
• M50: 12,507,130 km (0.079 R)
• M51: 12,706,993 km (0.101 R)
• M52: 12,787,177 km (0.093 R)
• M53: 12,867,511 km (0.071 R)
• M54: 13,353,256 km (0.071 R)
• M55: 13,721,565 km (0.059 R)
• M56: 14,930,915 km (0.084 R)
• M57: 15,569,548 km (0.052 R)
• M58: 16,087,007 km (0.117 R)
• M59: 17,094,549 km (0.085 R)
• M60: 18,212,494 km (0.102 R)
• M61: 18,438,985 km (0.026 R)
• M62: 19,215,846 km (0.096 R)
• M63: 20,283,826 km (0.113 R)
• M64: 20,330,650 km (0.083 R)
• M65: 23,208,165 km (0.075 R)
• M66: 24,394,326 km (0.118 R)
• M67: 24,744,086 km (0.103 R)
• M68: 27,237,883 km (0.114 R)
• M69: 27,808,599 km (0.101 R)
• M70: 28,383,354 km (0.101 R)
• M71: 29,014,657 km (0.066 R)
• M72: 29,279,146 km (0.098 R)
• M73: 29,863,774 km (0.095 R)
• M74: 30,077,400 km (0.085 R)
• M75: 30,130,806 km (0.107 R)
• M76: 30,667,264 km (0.071 R)
• M77: 30,882,685 km (0.091 R)
• M78: 32,185,832 km (0.049 R)
• M79: 32,459,596 km (0.09 R)
• M80: 33,009,369 km (0.025 R)
• M81: 33,174,973 km (0.12 R)
• M82: 34,901,632 km (0.115 R)
• M83: 35,070,378 km (0.11 R)
• M84: 35,182,876 km (0.08 R)
• M85: 35,521,416 km (0.11 R)
• M86: 36,943,344 km (0.073 R)
• M87: 38,036,455 km (0.05 R)
• M88: 38,674,042 km (0.085 R)

Planet 8 - Ice Giant

Semi-Major Axis: 9.13 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 513.6

Radius: 6

Gravity: 14.27 G

Time & Orbit

Eccentricity (e): 0.161

Orbit Range: 7.66 AU - 10.6 AU

Year: 18097 Days

Day: 16.2 Hours

Environment

Temp: -226 °C

Axial Tilt: 31.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (87)

Outer Limit: 64,667,883 km

• M1: 129,701 km (0.12 R)
• M2: 243,845 km (0.117 R)
• M3: 393,592 km (0.066 R)
• M4: 610,808 km (0.034 R)
• M5: 1,481,767 km (0.096 R)
• M6: 1,760,767 km (0.072 R)
• M7: 1,847,833 km (0.062 R)
• M8: 2,303,807 km (0.057 R)
• M9: 2,463,428 km (0.09 R)
• M10: 2,560,816 km (0.09 R)
• M11: 2,793,291 km (0.086 R)
• M12: 2,998,091 km (0.027 R)
• M13: 3,385,998 km (0.078 R)
• M14: 3,604,261 km (0.091 R)
• M15: 3,940,258 km (0.089 R)
• M16: 4,403,862 km (0.102 R)
• M17: 4,966,350 km (0.101 R)
• M18: 5,466,456 km (0.107 R)
• M19: 5,982,419 km (0.09 R)
• M20: 6,113,915 km (0.114 R)
• M21: 6,379,751 km (0.105 R)
• M22: 6,785,460 km (0.084 R)
• M23: 7,106,796 km (0.09 R)
• M24: 7,292,597 km (0.065 R)
• M25: 7,433,069 km (0.111 R)
• M26: 7,764,279 km (0.113 R)
• M27: 9,338,946 km (0.105 R)
• M28: 9,747,648 km (0.051 R)
• M29: 9,954,093 km (0.101 R)
• M30: 10,794,683 km (0.045 R)
• M31: 10,901,346 km (0.058 R)
• M32: 11,494,203 km (0.111 R)
• M33: 11,932,076 km (0.047 R)
• M34: 12,264,033 km (0.108 R)
• M35: 12,598,983 km (0.085 R)
• M36: 12,993,473 km (0.084 R)
• M37: 13,050,320 km (0.065 R)
• M38: 13,335,005 km (0.081 R)
• M39: 13,737,124 km (0.038 R)
• M40: 14,553,180 km (0.107 R)
• M41: 15,565,210 km (0.109 R)
• M42: 17,218,565 km (0.103 R)
• M43: 18,351,470 km (0.041 R)
• M44: 18,734,590 km (0.083 R)
• M45: 18,862,796 km (0.061 R)
• M46: 21,488,238 km (0.08 R)
• M47: 22,094,558 km (0.11 R)
• M48: 22,706,563 km (0.06 R)
• M49: 22,774,929 km (0.091 R)
• M50: 24,505,478 km (0.11 R)
• M51: 25,138,875 km (0.118 R)
• M52: 26,709,503 km (0.039 R)
• M53: 28,385,298 km (0.117 R)
• M54: 29,870,057 km (0.114 R)
• M55: 30,170,001 km (0.08 R)
• M56: 30,999,970 km (0.105 R)
• M57: 31,227,658 km (0.059 R)
• M58: 32,528,262 km (0.03 R)
• M59: 33,768,428 km (0.075 R)
• M60: 33,924,459 km (0.105 R)
• M61: 34,159,178 km (0.084 R)
• M62: 38,066,674 km (0.054 R)
• M63: 39,045,044 km (0.103 R)
• M64: 39,784,207 km (0.067 R)
• M65: 41,276,296 km (0.117 R)
• M66: 41,610,349 km (0.108 R)
• M67: 41,861,523 km (0.084 R)
• M68: 44,485,919 km (0.082 R)
• M69: 44,657,059 km (0.031 R)
• M70: 45,774,854 km (0.071 R)
• M71: 46,553,960 km (0.092 R)
• M72: 47,774,828 km (0.052 R)
• M73: 48,037,821 km (0.086 R)
• M74: 48,829,643 km (0.103 R)
• M75: 49,271,405 km (0.115 R)
• M76: 49,625,653 km (0.039 R)
• M77: 50,336,991 km (0.083 R)
• M78: 51,230,838 km (0.118 R)
• M79: 51,769,540 km (0.043 R)
• M80: 53,034,091 km (0.096 R)
• M81: 53,397,165 km (0.102 R)
• M82: 59,790,080 km (0.063 R)
• M83: 63,316,252 km (0.092 R)
• M84: 63,701,466 km (0.107 R)
• M85: 63,894,298 km (0.117 R)
• M86: 64,087,429 km (0.091 R)
• M87: 64,184,069 km (0.043 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: 544 - 12,336 AU

Composition

Type: Cometary Reservoir

System's final boundary, containing trillions of icy planetesimals.

Gravitational Limit