🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.63 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.96

Radius: 1.9

Gravity: 1.37 G

Time & Orbit

Eccentricity (e): 0.051

Orbit Range: 0.6 AU - 0.66 AU

Year: 328 Days

Day: 17.6 Hours

Environment

Temp: -124 °C

Axial Tilt: 126 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 83,033,798 km

• M1: 52,658 km (0.071 R)

Planet 2 - Terrestrial

Semi-Major Axis: 0.63 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.88

Radius: 1.53

Gravity: 1.23 G

Time & Orbit

Eccentricity (e): 0.124

Orbit Range: 0.55 AU - 0.71 AU

Year: 328 Days

Day: 14.3 Hours

Environment

Temp: -140 °C

Axial Tilt: 3.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 83,033,798 km

• M1: 122,969 km (0.102 R)

Planet 3 - Gas Giant

Semi-Major Axis: 4.65 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 437.7

Radius: 14.7

Gravity: 2.03 G

Time & Orbit

Eccentricity (e): 0.11

Orbit Range: 4.14 AU - 5.16 AU

Year: 6578 Days

Day: 6.8 Hours

Environment

Temp: -208 °C

Axial Tilt: 15.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 83,033,798 km

• M1: 187,895 km (0.055 R)
• M2: 449,990 km (0.103 R)
• M3: 639,082 km (0.06 R)
• M4: 938,577 km (0.09 R)
• M5: 1,149,809 km (0.111 R)
• M6: 1,362,089 km (0.119 R)
• M7: 1,861,446 km (0.056 R)
• M8: 2,320,413 km (0.083 R)
• M9: 2,416,604 km (0.068 R)
• M10: 2,533,739 km (0.116 R)
• M11: 2,753,798 km (0.108 R)
• M12: 3,213,063 km (0.098 R)
• M13: 3,562,524 km (0.109 R)
• M14: 4,040,040 km (0.089 R)
• M15: 4,393,689 km (0.096 R)
• M16: 4,513,966 km (0.11 R)
• M17: 5,030,827 km (0.115 R)
• M18: 5,131,506 km (0.116 R)
• M19: 6,148,173 km (0.097 R)
• M20: 6,256,033 km (0.068 R)
• M21: 6,364,492 km (0.092 R)
• M22: 7,056,532 km (0.105 R)
• M23: 7,368,742 km (0.07 R)
• M24: 7,627,547 km (0.119 R)
• M25: 8,154,430 km (0.1 R)
• M26: 8,422,211 km (0.069 R)
• M27: 8,632,545 km (0.111 R)
• M28: 8,783,938 km (0.082 R)
• M29: 8,905,711 km (0.073 R)
• M30: 10,026,348 km (0.104 R)
• M31: 10,121,792 km (0.108 R)
• M32: 10,700,586 km (0.096 R)
• M33: 10,798,124 km (0.11 R)
• M34: 10,994,097 km (0.112 R)
• M35: 11,589,197 km (0.055 R)
• M36: 11,689,428 km (0.072 R)
• M37: 11,924,297 km (0.083 R)
• M38: 12,160,811 km (0.117 R)
• M39: 12,535,703 km (0.043 R)
• M40: 12,810,664 km (0.058 R)
• M41: 13,296,708 km (0.07 R)
• M42: 13,753,579 km (0.101 R)
• M43: 13,859,794 km (0.081 R)
• M44: 14,358,852 km (0.084 R)
• M45: 14,972,802 km (0.094 R)
• M46: 15,228,016 km (0.11 R)
• M47: 15,521,677 km (0.049 R)
• M48: 15,669,031 km (0.099 R)
• M49: 15,891,183 km (0.106 R)
• M50: 16,301,082 km (0.101 R)
• M51: 17,093,501 km (0.04 R)
• M52: 17,475,126 km (0.117 R)
• M53: 17,667,060 km (0.103 R)
• M54: 18,676,397 km (0.109 R)
• M55: 18,912,013 km (0.071 R)
• M56: 19,904,296 km (0.074 R)
• M57: 20,225,333 km (0.119 R)
• M58: 20,426,841 km (0.039 R)
• M59: 20,954,174 km (0.071 R)
• M60: 21,732,681 km (0.105 R)
• M61: 22,562,500 km (0.085 R)
• M62: 23,191,709 km (0.105 R)
• M63: 24,167,835 km (0.09 R)
• M64: 24,984,191 km (0.076 R)
• M65: 25,243,893 km (0.062 R)
• M66: 25,417,576 km (0.099 R)
• M67: 25,809,672 km (0.091 R)
• M68: 26,159,880 km (0.097 R)
• M69: 26,423,621 km (0.076 R)
• M70: 27,220,081 km (0.106 R)
• M71: 27,800,221 km (0.099 R)
• M72: 28,204,285 km (0.103 R)
• M73: 29,291,263 km (0.12 R)
• M74: 29,656,731 km (0.071 R)
• M75: 29,885,765 km (0.106 R)
• M76: 30,345,778 km (0.063 R)
• M77: 30,900,936 km (0.081 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.75 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 590.4

Radius: 12.6

Gravity: 3.72 G

Time & Orbit

Eccentricity (e): 0.152

Orbit Range: 4.03 AU - 5.47 AU

Year: 6791 Days

Day: 13.9 Hours

Environment

Temp: -220 °C

Axial Tilt: 9.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 83,033,798 km

• M1: 159,771 km (0.059 R)
• M2: 295,456 km (0.112 R)
• M3: 426,952 km (0.105 R)
• M4: 672,442 km (0.109 R)
• M5: 751,580 km (0.057 R)
• M6: 965,505 km (0.117 R)
• M7: 1,088,325 km (0.114 R)
• M8: 1,419,385 km (0.119 R)
• M9: 1,579,006 km (0.108 R)
• M10: 1,726,060 km (0.115 R)
• M11: 2,277,179 km (0.078 R)
• M12: 2,487,065 km (0.094 R)
• M13: 2,681,392 km (0.064 R)
• M14: 4,027,025 km (0.084 R)
• M15: 4,179,465 km (0.105 R)
• M16: 4,970,389 km (0.079 R)
• M17: 5,216,627 km (0.076 R)
• M18: 5,299,654 km (0.099 R)
• M19: 5,439,079 km (0.116 R)
• M20: 5,523,303 km (0.064 R)
• M21: 5,951,003 km (0.07 R)
• M22: 7,051,595 km (0.114 R)
• M23: 7,767,121 km (0.033 R)
• M24: 7,989,573 km (0.046 R)
• M25: 8,834,203 km (0.055 R)
• M26: 9,401,777 km (0.084 R)
• M27: 10,223,369 km (0.111 R)
• M28: 11,390,232 km (0.094 R)
• M29: 11,607,000 km (0.105 R)
• M30: 11,971,270 km (0.057 R)
• M31: 13,618,493 km (0.039 R)
• M32: 13,810,127 km (0.104 R)
• M33: 14,703,376 km (0.075 R)
• M34: 14,899,948 km (0.089 R)
• M35: 15,535,140 km (0.112 R)
• M36: 15,695,360 km (0.106 R)
• M37: 15,775,694 km (0.06 R)
• M38: 16,341,623 km (0.106 R)
• M39: 16,423,004 km (0.091 R)
• M40: 16,627,205 km (0.103 R)
• M41: 16,832,154 km (0.118 R)
• M42: 17,203,157 km (0.025 R)
• M43: 17,702,066 km (0.119 R)
• M44: 17,911,353 km (0.042 R)
• M45: 18,459,330 km (0.07 R)
• M46: 18,628,974 km (0.119 R)
• M47: 18,714,095 km (0.066 R)
• M48: 18,841,852 km (0.111 R)
• M49: 19,442,338 km (0.069 R)
• M50: 19,571,740 km (0.119 R)
• M51: 20,574,046 km (0.106 R)
• M52: 20,662,009 km (0.089 R)
• M53: 20,750,122 km (0.12 R)
• M54: 20,838,235 km (0.032 R)
• M55: 21,503,647 km (0.032 R)
• M56: 22,356,654 km (0.117 R)
• M57: 22,764,458 km (0.111 R)
• M58: 23,358,062 km (0.032 R)
• M59: 23,495,692 km (0.115 R)
• M60: 23,679,697 km (0.094 R)
• M61: 24,934,375 km (0.114 R)
• M62: 26,976,685 km (0.119 R)
• M63: 28,042,420 km (0.096 R)
• M64: 28,482,238 km (0.074 R)
• M65: 28,629,442 km (0.114 R)
• M66: 28,924,449 km (0.065 R)
• M67: 29,319,387 km (0.074 R)
• M68: 29,468,088 km (0.098 R)
• M69: 29,765,937 km (0.11 R)
• M70: 30,615,503 km (0.115 R)
• M71: 31,371,721 km (0.08 R)
• M72: 32,645,696 km (0.05 R)
• M73: 32,748,320 km (0.048 R)
• M74: 33,728,785 km (0.117 R)
• M75: 34,353,057 km (0.103 R)
• M76: 34,509,686 km (0.1 R)
• M77: 34,666,614 km (0.049 R)

Planet 5 - Ice Giant

Semi-Major Axis: 7.84 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 251.1

Radius: 4.3

Gravity: 13.58 G

Time & Orbit

Eccentricity (e): 0.233

Orbit Range: 6.01 AU - 9.67 AU

Year: 14401 Days

Day: 17.4 Hours

Environment

Temp: -223 °C

Axial Tilt: 33.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 83,033,798 km

• M1: 79,137 km (0.103 R)
• M2: 110,852 km (0.093 R)
• M3: 269,276 km (0.091 R)
• M4: 339,587 km (0.11 R)
• M5: 556,654 km (0.101 R)
• M6: 1,393,953 km (0.03 R)
• M7: 1,476,830 km (0.067 R)
• M8: 1,561,353 km (0.107 R)
• M9: 1,604,288 km (0.039 R)
• M10: 1,691,204 km (0.116 R)
• M11: 1,892,563 km (0.106 R)
• M12: 2,317,720 km (0.082 R)
• M13: 2,516,087 km (0.044 R)
• M14: 3,008,563 km (0.079 R)
• M15: 3,224,732 km (0.097 R)
• M16: 3,418,012 km (0.105 R)
• M17: 3,815,793 km (0.113 R)
• M18: 4,020,293 km (0.091 R)
• M19: 4,198,315 km (0.038 R)
• M20: 4,873,001 km (0.109 R)
• M21: 4,967,547 km (0.095 R)
• M22: 5,094,705 km (0.028 R)
• M23: 5,158,583 km (0.091 R)
• M24: 5,319,700 km (0.073 R)
• M25: 5,913,005 km (0.097 R)
• M26: 6,423,284 km (0.062 R)
• M27: 7,340,917 km (0.055 R)
• M28: 7,925,695 km (0.118 R)
• M29: 8,869,059 km (0.032 R)
• M30: 9,451,893 km (0.096 R)
• M31: 10,127,177 km (0.03 R)
• M32: 10,248,053 km (0.081 R)
• M33: 10,531,840 km (0.084 R)
• M34: 10,695,051 km (0.087 R)
• M35: 11,524,122 km (0.089 R)
• M36: 12,201,950 km (0.102 R)
• M37: 12,330,604 km (0.081 R)
• M38: 12,373,539 km (0.08 R)
• M39: 12,762,344 km (0.094 R)
• M40: 12,805,727 km (0.091 R)
• M41: 13,067,524 km (0.102 R)
• M42: 13,551,922 km (0.088 R)
• M43: 14,948,418 km (0.115 R)
• M44: 15,408,581 km (0.117 R)
• M45: 16,201,599 km (0.04 R)
• M46: 16,674,179 km (0.086 R)
• M47: 16,912,189 km (0.095 R)
• M48: 17,972,688 km (0.102 R)
• M49: 18,070,076 km (0.096 R)
• M50: 19,403,143 km (0.106 R)
• M51: 19,503,224 km (0.049 R)
• M52: 19,703,685 km (0.037 R)
• M53: 20,921,113 km (0.109 R)
• M54: 21,023,587 km (0.091 R)
• M55: 21,590,563 km (0.069 R)
• M56: 21,797,906 km (0.05 R)
• M57: 21,901,876 km (0.082 R)
• M58: 22,371,763 km (0.04 R)
• M59: 22,424,122 km (0.108 R)
• M60: 23,056,323 km (0.071 R)
• M61: 24,015,395 km (0.098 R)
• M62: 24,445,938 km (0.087 R)
• M63: 25,752,376 km (0.085 R)
• M64: 26,691,551 km (0.091 R)
• M65: 28,773,954 km (0.095 R)
• M66: 29,173,829 km (0.071 R)
• M67: 29,748,135 km (0.064 R)
• M68: 31,141,789 km (0.117 R)
• M69: 31,317,566 km (0.11 R)
• M70: 31,434,851 km (0.074 R)
• M71: 32,141,701 km (0.119 R)
• M72: 32,913,476 km (0.028 R)
• M73: 34,475,278 km (0.066 R)
• M74: 35,693,005 km (0.064 R)
• M75: 37,920,068 km (0.095 R)
• M76: 39,429,511 km (0.074 R)
• M77: 39,556,220 km (0.088 R)
• M78: 40,830,495 km (0.067 R)
• M79: 41,151,083 km (0.098 R)
• M80: 42,507,038 km (0.085 R)
• M81: 42,962,115 km (0.1 R)

Planet 6 - Ice Giant

Semi-Major Axis: 8.64 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 776.2

Radius: 3.8

Gravity: 53.75 G

Time & Orbit

Eccentricity (e): 0.058

Orbit Range: 8.14 AU - 9.14 AU

Year: 16660 Days

Day: 19.4 Hours

Environment

Temp: -220 °C

Axial Tilt: 21.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 83,033,798 km

• M1: 88,412 km (0.079 R)
• M2: 139,575 km (0.069 R)
• M3: 163,510 km (0.051 R)
• M4: 260,899 km (0.111 R)
• M5: 358,586 km (0.066 R)
• M6: 546,780 km (0.109 R)
• M7: 651,349 km (0.085 R)
• M8: 952,490 km (0.071 R)
• M9: 1,002,306 km (0.098 R)
• M10: 1,053,019 km (0.095 R)
• M11: 1,078,750 km (0.089 R)
• M12: 1,104,631 km (0.114 R)
• M13: 1,291,778 km (0.051 R)
• M14: 1,517,670 km (0.076 R)
• M15: 1,910,664 km (0.099 R)
• M16: 2,005,659 km (0.031 R)
• M17: 2,266,557 km (0.063 R)
• M18: 3,037,884 km (0.105 R)
• M19: 4,002,790 km (0.115 R)
• M20: 6,137,103 km (0.089 R)
• M21: 6,656,956 km (0.093 R)
• M22: 7,043,816 km (0.111 R)
• M23: 7,190,721 km (0.077 R)
• M24: 7,338,673 km (0.029 R)
• M25: 7,738,099 km (0.09 R)
• M26: 7,839,078 km (0.11 R)
• M27: 8,662,465 km (0.098 R)
• M28: 9,031,373 km (0.038 R)
• M29: 9,084,480 km (0.059 R)
• M30: 9,137,588 km (0.117 R)
• M31: 9,405,218 km (0.028 R)
• M32: 10,223,518 km (0.048 R)
• M33: 10,501,172 km (0.085 R)
• M34: 11,292,096 km (0.09 R)
• M35: 11,464,134 km (0.108 R)
• M36: 12,395,829 km (0.089 R)
• M37: 12,930,492 km (0.073 R)
• M38: 13,777,216 km (0.1 R)
• M39: 14,641,592 km (0.101 R)
• M40: 15,587,051 km (0.111 R)
• M41: 15,650,780 km (0.054 R)
• M42: 15,906,592 km (0.117 R)
• M43: 17,403,917 km (0.117 R)
• M44: 17,668,855 km (0.046 R)
• M45: 18,337,258 km (0.108 R)
• M46: 18,809,838 km (0.116 R)
• M47: 20,600,524 km (0.118 R)
• M48: 23,095,218 km (0.105 R)
• M49: 23,532,343 km (0.085 R)
• M50: 24,119,515 km (0.099 R)
• M51: 24,562,923 km (0.051 R)
• M52: 24,860,174 km (0.109 R)
• M53: 27,433,557 km (0.118 R)
• M54: 28,439,752 km (0.098 R)
• M55: 29,143,311 km (0.056 R)
• M56: 29,300,389 km (0.029 R)
• M57: 30,567,632 km (0.042 R)
• M58: 30,647,368 km (0.117 R)
• M59: 30,887,173 km (0.107 R)
• M60: 31,690,963 km (0.117 R)
• M61: 32,095,475 km (0.112 R)
• M62: 32,176,557 km (0.09 R)
• M63: 32,339,021 km (0.104 R)
• M64: 32,501,633 km (0.083 R)
• M65: 32,827,906 km (0.093 R)
• M66: 33,648,002 km (0.068 R)
• M67: 34,724,359 km (0.064 R)
• M68: 35,727,861 km (0.061 R)
• M69: 35,896,009 km (0.116 R)
• M70: 37,421,309 km (0.071 R)
• M71: 39,140,787 km (0.059 R)
• M72: 39,227,404 km (0.102 R)
• M73: 40,798,032 km (0.105 R)
• M74: 42,923,967 km (0.066 R)
• M75: 44,722,732 km (0.109 R)
• M76: 46,271,070 km (0.107 R)
• M77: 46,454,328 km (0.103 R)
• M78: 48,393,714 km (0.109 R)
• M79: 49,607,402 km (0.065 R)
• M80: 50,830,963 km (0.104 R)
• M81: 50,925,509 km (0.118 R)
• M82: 52,924,286 km (0.095 R)
• M83: 53,788,812 km (0.09 R)
• M84: 54,077,985 km (0.105 R)
• M85: 57,588,448 km (0.115 R)
• M86: 58,973,276 km (0.04 R)
• M87: 61,372,826 km (0.057 R)
• M88: 61,473,505 km (0.066 R)
• M89: 61,876,671 km (0.056 R)
• M90: 62,179,757 km (0.107 R)
• M91: 63,498,462 km (0.088 R)
• M92: 68,133,752 km (0.062 R)
• M93: 68,864,537 km (0.1 R)

Planet 7 - Ice Giant

Semi-Major Axis: 9.39 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 999.4

Radius: 4.9

Gravity: 41.62 G

Time & Orbit

Eccentricity (e): 0.061

Orbit Range: 8.82 AU - 9.96 AU

Year: 18876 Days

Day: 24.4 Hours

Environment

Temp: -231 °C

Axial Tilt: 34 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 83,033,798 km

• M1: 90,208 km (0.117 R)
• M2: 261,347 km (0.08 R)
• M3: 1,073,365 km (0.083 R)
• M4: 1,435,990 km (0.114 R)
• M5: 1,597,556 km (0.095 R)
• M6: 1,903,334 km (0.087 R)
• M7: 2,414,210 km (0.108 R)
• M8: 3,596,632 km (0.099 R)
• M9: 3,771,961 km (0.115 R)
• M10: 4,130,996 km (0.119 R)
• M11: 4,547,775 km (0.061 R)
• M12: 4,737,316 km (0.043 R)
• M13: 5,271,979 km (0.099 R)
• M14: 5,321,495 km (0.072 R)
• M15: 5,571,623 km (0.096 R)
• M16: 5,774,478 km (0.09 R)
• M17: 6,292,086 km (0.093 R)
• M18: 6,878,510 km (0.064 R)
• M19: 7,762,334 km (0.03 R)
• M20: 8,160,115 km (0.084 R)
• M21: 8,217,411 km (0.05 R)
• M22: 8,332,601 km (0.035 R)
• M23: 8,916,332 km (0.104 R)
• M24: 9,034,664 km (0.096 R)
• M25: 9,272,974 km (0.116 R)
• M26: 11,572,592 km (0.058 R)
• M27: 12,288,567 km (0.072 R)
• M28: 12,420,214 km (0.076 R)
• M29: 12,751,573 km (0.106 R)
• M30: 13,355,350 km (0.074 R)
• M31: 14,312,926 km (0.072 R)
• M32: 14,940,040 km (0.076 R)
• M33: 15,151,123 km (0.042 R)
• M34: 15,292,343 km (0.063 R)
• M35: 15,505,071 km (0.096 R)
• M36: 16,005,177 km (0.091 R)
• M37: 16,076,984 km (0.092 R)
• M38: 16,365,558 km (0.115 R)
• M39: 17,168,001 km (0.104 R)
• M40: 17,241,603 km (0.074 R)
• M41: 17,315,206 km (0.109 R)
• M42: 18,508,398 km (0.1 R)
• M43: 19,267,458 km (0.054 R)
• M44: 21,446,351 km (0.105 R)
• M45: 23,293,735 km (0.108 R)
• M46: 24,941,107 km (0.111 R)
• M47: 25,947,451 km (0.066 R)
• M48: 26,201,020 km (0.095 R)
• M49: 27,653,914 km (0.104 R)
• M50: 27,826,550 km (0.12 R)
• M51: 28,346,553 km (0.117 R)
• M52: 30,369,714 km (0.097 R)
• M53: 32,986,031 km (0.104 R)
• M54: 33,812,560 km (0.098 R)
• M55: 34,274,667 km (0.077 R)
• M56: 34,925,119 km (0.1 R)
• M57: 35,298,665 km (0.093 R)
• M58: 36,806,163 km (0.031 R)
• M59: 36,901,008 km (0.085 R)
• M60: 38,623,178 km (0.109 R)
• M61: 39,785,853 km (0.12 R)
• M62: 39,980,779 km (0.111 R)
• M63: 42,642,574 km (0.056 R)
• M64: 43,041,851 km (0.065 R)
• M65: 43,342,093 km (0.066 R)
• M66: 44,045,203 km (0.103 R)
• M67: 45,157,912 km (0.105 R)
• M68: 47,617,451 km (0.107 R)
• M69: 49,804,871 km (0.12 R)
• M70: 51,281,402 km (0.071 R)
• M71: 54,493,268 km (0.088 R)
• M72: 54,601,428 km (0.113 R)
• M73: 56,560,861 km (0.088 R)
• M74: 59,988,896 km (0.1 R)
• M75: 60,100,645 km (0.103 R)
• M76: 61,671,722 km (0.107 R)
• M77: 62,010,113 km (0.058 R)
• M78: 63,939,476 km (0.12 R)
• M79: 64,510,641 km (0.105 R)
• M80: 65,198,342 km (0.12 R)
• M81: 66,928,143 km (0.086 R)
• M82: 68,439,380 km (0.068 R)
• M83: 69,140,695 km (0.074 R)
• M84: 70,668,389 km (0.037 R)
• M85: 71,377,183 km (0.096 R)
• M86: 72,801,953 km (0.116 R)
• M87: 73,040,263 km (0.071 R)
• M88: 73,996,343 km (0.11 R)
• M89: 79,328,160 km (0.047 R)
• M90: 79,573,501 km (0.086 R)
• M91: 80,927,063 km (0.03 R)
• M92: 81,173,899 km (0.112 R)

Kuiper Belt

Range: 30 - 56 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 303 - 18,341 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit