🌌 Stone's Star System Generator

Planet 1 - Gas Giant

Semi-Major Axis: 0.8 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 26.7

Radius: 14

Gravity: 0.14 G

Time & Orbit

Eccentricity (e): 0.008

Orbit Range: 0.79 AU - 0.81 AU

Year: 494 Days

Day: 7.5 Hours

Environment

Temp: -162 °C

Axial Tilt: 28.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (15)

Outer Limit: 63,320,657 km

• M1: 176,825 km (0.072 R)
• M2: 315,203 km (0.104 R)
• M3: 453,431 km (0.057 R)
• M4: 562,787 km (0.098 R)
• M5: 718,369 km (0.088 R)
• M6: 831,315 km (0.096 R)
• M7: 951,143 km (0.105 R)
• M8: 1,159,533 km (0.104 R)
• M9: 1,256,323 km (0.103 R)
• M10: 1,378,844 km (0.098 R)
• M11: 1,534,725 km (0.104 R)
• M12: 1,623,137 km (0.088 R)
• M13: 1,901,987 km (0.079 R)
• M14: 1,997,580 km (0.11 R)
• M15: 2,094,819 km (0.06 R)

Planet 2 - Gas Giant

Semi-Major Axis: 3.21 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 919.1

Radius: 11.4

Gravity: 7.07 G

Time & Orbit

Eccentricity (e): 0.055

Orbit Range: 3.03 AU - 3.39 AU

Year: 3970 Days

Day: 7.4 Hours

Environment

Temp: -207 °C

Axial Tilt: 32.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 63,320,657 km

• M1: 194,028 km (0.103 R)
• M2: 569,818 km (0.094 R)
• M3: 656,735 km (0.096 R)
• M4: 845,976 km (0.053 R)
• M5: 1,067,381 km (0.113 R)
• M6: 1,150,258 km (0.102 R)
• M7: 1,337,704 km (0.105 R)
• M8: 1,489,097 km (0.075 R)
• M9: 1,582,596 km (0.089 R)
• M10: 1,726,958 km (0.092 R)
• M11: 1,875,808 km (0.053 R)
• M12: 2,329,837 km (0.069 R)
• M13: 2,439,492 km (0.081 R)
• M14: 2,607,341 km (0.11 R)
• M15: 2,817,825 km (0.092 R)
• M16: 3,053,891 km (0.104 R)
• M17: 3,358,173 km (0.116 R)
• M18: 3,908,843 km (0.093 R)
• M19: 4,284,333 km (0.039 R)
• M20: 4,579,340 km (0.119 R)
• M21: 4,834,106 km (0.066 R)
• M22: 5,309,528 km (0.105 R)
• M23: 5,503,855 km (0.088 R)
• M24: 5,775,076 km (0.12 R)
• M25: 6,075,918 km (0.075 R)
• M26: 6,253,789 km (0.051 R)
• M27: 6,771,548 km (0.07 R)
• M28: 6,929,673 km (0.112 R)
• M29: 7,035,737 km (0.113 R)
• M30: 7,195,807 km (0.119 R)
• M31: 7,519,687 km (0.11 R)
• M32: 8,209,782 km (0.083 R)
• M33: 8,491,624 km (0.118 R)
• M34: 8,662,166 km (0.108 R)
• M35: 8,920,222 km (0.113 R)
• M36: 9,326,679 km (0.036 R)
• M37: 9,768,891 km (0.116 R)
• M38: 9,887,970 km (0.114 R)
• M39: 10,037,568 km (0.025 R)
• M40: 10,612,772 km (0.075 R)
• M41: 11,260,980 km (0.059 R)
• M42: 11,448,575 km (0.12 R)
• M43: 11,922,053 km (0.111 R)
• M44: 12,113,239 km (0.109 R)
• M45: 12,498,752 km (0.106 R)
• M46: 12,790,468 km (0.063 R)
• M47: 13,084,428 km (0.106 R)
• M48: 13,215,925 km (0.084 R)
• M49: 13,479,965 km (0.054 R)
• M50: 14,114,260 km (0.089 R)
• M51: 14,587,887 km (0.119 R)
• M52: 14,826,645 km (0.12 R)
• M53: 15,032,342 km (0.073 R)
• M54: 15,308,051 km (0.103 R)
• M55: 15,446,579 km (0.055 R)
• M56: 15,655,118 km (0.079 R)
• M57: 16,215,811 km (0.061 R)
• M58: 16,427,791 km (0.105 R)
• M59: 16,818,840 km (0.064 R)
• M60: 16,890,198 km (0.072 R)
• M61: 17,176,977 km (0.057 R)
• M62: 17,610,063 km (0.082 R)
• M63: 17,682,618 km (0.105 R)
• M64: 17,827,877 km (0.104 R)
• M65: 18,856,662 km (0.106 R)
• M66: 20,245,379 km (0.045 R)
• M67: 21,048,121 km (0.112 R)
• M68: 22,017,366 km (0.075 R)
• M69: 22,803,353 km (0.114 R)
• M70: 23,120,201 km (0.103 R)
• M71: 23,398,753 km (0.054 R)
• M72: 24,645,651 km (0.095 R)
• M73: 24,726,733 km (0.112 R)
• M74: 26,535,222 km (0.096 R)
• M75: 27,581,808 km (0.104 R)
• M76: 27,708,218 km (0.106 R)
• M77: 28,428,682 km (0.081 R)

Planet 3 - Gas Giant

Semi-Major Axis: 3.51 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 765.7

Radius: 13.1

Gravity: 4.46 G

Time & Orbit

Eccentricity (e): 0.13

Orbit Range: 3.05 AU - 3.97 AU

Year: 4539 Days

Day: 11.6 Hours

Environment

Temp: -213 °C

Axial Tilt: 35.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (70)

Outer Limit: 63,320,657 km

• M1: 206,295 km (0.074 R)
• M2: 387,907 km (0.091 R)
• M3: 470,186 km (0.118 R)
• M4: 571,015 km (0.063 R)
• M5: 836,551 km (0.052 R)
• M6: 991,535 km (0.075 R)
• M7: 1,185,563 km (0.056 R)
• M8: 1,516,623 km (0.035 R)
• M9: 1,693,448 km (0.058 R)
• M10: 1,843,345 km (0.07 R)
• M11: 1,963,173 km (0.115 R)
• M12: 2,103,496 km (0.052 R)
• M13: 2,192,806 km (0.054 R)
• M14: 2,563,659 km (0.103 R)
• M15: 3,136,918 km (0.108 R)
• M16: 3,491,465 km (0.116 R)
• M17: 3,662,904 km (0.119 R)
• M18: 3,793,353 km (0.084 R)
• M19: 3,947,439 km (0.088 R)
• M20: 4,678,823 km (0.085 R)
• M21: 5,084,532 km (0.064 R)
• M22: 5,904,478 km (0.117 R)
• M23: 6,083,846 km (0.119 R)
• M24: 6,579,614 km (0.078 R)
• M25: 6,792,192 km (0.088 R)
• M26: 7,306,510 km (0.119 R)
• M27: 7,526,867 km (0.07 R)
• M28: 7,749,469 km (0.116 R)
• M29: 7,889,792 km (0.112 R)
• M30: 9,517,566 km (0.079 R)
• M31: 9,909,961 km (0.114 R)
• M32: 10,369,526 km (0.117 R)
• M33: 10,555,177 km (0.107 R)
• M34: 10,773,291 km (0.101 R)
• M35: 12,736,763 km (0.083 R)
• M36: 13,069,169 km (0.051 R)
• M37: 14,461,477 km (0.116 R)
• M38: 15,052,687 km (0.111 R)
• M39: 15,157,855 km (0.111 R)
• M40: 15,439,398 km (0.11 R)
• M41: 15,687,132 km (0.094 R)
• M42: 15,829,399 km (0.034 R)
• M43: 16,294,499 km (0.112 R)
• M44: 16,474,615 km (0.117 R)
• M45: 16,619,276 km (0.098 R)
• M46: 16,909,646 km (0.045 R)
• M47: 18,424,175 km (0.051 R)
• M48: 18,951,357 km (0.064 R)
• M49: 19,636,366 km (0.101 R)
• M50: 20,097,576 km (0.113 R)
• M51: 20,562,377 km (0.117 R)
• M52: 20,679,063 km (0.077 R)
• M53: 21,305,579 km (0.079 R)
• M54: 21,581,587 km (0.03 R)
• M55: 21,819,149 km (0.117 R)
• M56: 22,777,921 km (0.071 R)
• M57: 23,060,213 km (0.081 R)
• M58: 23,506,164 km (0.116 R)
• M59: 23,709,767 km (0.09 R)
• M60: 24,118,767 km (0.077 R)
• M61: 24,612,739 km (0.075 R)
• M62: 24,736,756 km (0.059 R)
• M63: 24,860,922 km (0.047 R)
• M64: 26,367,672 km (0.115 R)
• M65: 27,089,482 km (0.075 R)
• M66: 27,774,789 km (0.103 R)
• M67: 28,335,781 km (0.059 R)
• M68: 28,422,399 km (0.081 R)
• M69: 28,639,316 km (0.1 R)
• M70: 29,162,459 km (0.111 R)

Planet 4 - Gas Giant

Semi-Major Axis: 4.13 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 403

Radius: 8.9

Gravity: 5.09 G

Time & Orbit

Eccentricity (e): 0.098

Orbit Range: 3.73 AU - 4.53 AU

Year: 5793 Days

Day: 14.1 Hours

Environment

Temp: -221 °C

Axial Tilt: 14 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (87)

Outer Limit: 63,320,657 km

• M1: 127,009 km (0.075 R)
• M2: 233,971 km (0.107 R)
• M3: 412,292 km (0.056 R)
• M4: 571,464 km (0.073 R)
• M5: 763,548 km (0.069 R)
• M6: 976,724 km (0.114 R)
• M7: 1,237,623 km (0.027 R)
• M8: 1,413,849 km (0.093 R)
• M9: 1,551,480 km (0.092 R)
• M10: 1,725,761 km (0.091 R)
• M11: 1,807,292 km (0.118 R)
• M12: 1,940,284 km (0.087 R)
• M13: 2,216,143 km (0.115 R)
• M14: 2,287,052 km (0.078 R)
• M15: 2,358,859 km (0.103 R)
• M16: 2,767,112 km (0.1 R)
• M17: 2,824,408 km (0.119 R)
• M18: 3,627,599 km (0.108 R)
• M19: 3,732,916 km (0.098 R)
• M20: 3,860,373 km (0.074 R)
• M21: 3,946,242 km (0.079 R)
• M22: 4,119,925 km (0.051 R)
• M23: 4,656,084 km (0.094 R)
• M24: 4,886,016 km (0.118 R)
• M25: 5,166,961 km (0.086 R)
• M26: 5,309,378 km (0.029 R)
• M27: 5,768,943 km (0.093 R)
• M28: 5,916,745 km (0.106 R)
• M29: 6,040,912 km (0.095 R)
• M30: 6,342,501 km (0.093 R)
• M31: 6,418,646 km (0.073 R)
• M32: 6,700,489 km (0.084 R)
• M33: 6,907,981 km (0.075 R)
• M34: 6,986,370 km (0.104 R)
• M35: 7,065,059 km (0.103 R)
• M36: 7,651,033 km (0.09 R)
• M37: 8,224,891 km (0.115 R)
• M38: 9,154,642 km (0.029 R)
• M39: 9,212,087 km (0.111 R)
• M40: 9,385,172 km (0.074 R)
• M41: 9,705,012 km (0.063 R)
• M42: 9,763,655 km (0.099 R)
• M43: 9,822,297 km (0.066 R)
• M44: 9,969,501 km (0.116 R)
• M45: 10,355,763 km (0.072 R)
• M46: 10,415,602 km (0.104 R)
• M47: 10,777,180 km (0.118 R)
• M48: 10,868,136 km (0.09 R)
• M49: 11,142,797 km (0.097 R)
• M50: 11,327,252 km (0.083 R)
• M51: 11,886,448 km (0.06 R)
• M52: 11,949,130 km (0.099 R)
• M53: 12,774,162 km (0.077 R)
• M54: 13,551,922 km (0.099 R)
• M55: 13,650,357 km (0.101 R)
• M56: 14,079,104 km (0.077 R)
• M57: 14,245,158 km (0.079 R)
• M58: 14,311,729 km (0.065 R)
• M59: 14,747,358 km (0.091 R)
• M60: 14,915,955 km (0.106 R)
• M61: 15,769,112 km (0.111 R)
• M62: 16,149,389 km (0.098 R)
• M63: 16,954,525 km (0.106 R)
• M64: 17,202,110 km (0.113 R)
• M65: 17,808,430 km (0.114 R)
• M66: 17,988,097 km (0.107 R)
• M67: 18,132,309 km (0.037 R)
• M68: 18,676,397 km (0.05 R)
• M69: 18,822,404 km (0.117 R)
• M70: 18,968,711 km (0.119 R)
• M71: 19,780,578 km (0.04 R)
• M72: 20,265,575 km (0.071 R)
• M73: 20,415,621 km (0.107 R)
• M74: 20,490,720 km (0.108 R)
• M75: 21,171,390 km (0.073 R)
• M76: 21,629,159 km (0.032 R)
• M77: 22,515,826 km (0.069 R)
• M78: 22,671,258 km (0.094 R)
• M79: 23,061,260 km (0.09 R)
• M80: 23,927,282 km (0.109 R)
• M81: 24,563,821 km (0.111 R)
• M82: 24,683,798 km (0.11 R)
• M83: 25,246,137 km (0.114 R)
• M84: 25,529,026 km (0.088 R)
• M85: 26,424,669 km (0.101 R)
• M86: 26,588,628 km (0.096 R)
• M87: 27,828,944 km (0.05 R)

Planet 5 - Ice Giant

Semi-Major Axis: 7.67 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 354.7

Radius: 4.8

Gravity: 15.39 G

Time & Orbit

Eccentricity (e): 0.219

Orbit Range: 5.99 AU - 9.35 AU

Year: 14662 Days

Day: 15.8 Hours

Environment

Temp: -223 °C

Axial Tilt: 14 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 63,320,657 km

• M1: 64,177 km (0.107 R)
• M2: 486,791 km (0.056 R)
• M3: 631,153 km (0.076 R)
• M4: 752,776 km (0.119 R)
• M5: 844,330 km (0.115 R)
• M6: 901,028 km (0.113 R)
• M7: 978,669 km (0.094 R)
• M8: 1,099,245 km (0.109 R)
• M9: 1,140,534 km (0.101 R)
• M10: 1,723,816 km (0.094 R)
• M11: 1,796,371 km (0.107 R)
• M12: 2,771,001 km (0.117 R)
• M13: 2,884,696 km (0.111 R)
• M14: 3,058,229 km (0.106 R)
• M15: 3,629,992 km (0.115 R)
• M16: 4,039,890 km (0.082 R)
• M17: 4,698,869 km (0.034 R)
• M18: 5,930,060 km (0.096 R)
• M19: 6,411,316 km (0.114 R)
• M20: 6,943,735 km (0.086 R)
• M21: 7,137,165 km (0.073 R)
• M22: 7,176,210 km (0.114 R)
• M23: 7,254,150 km (0.09 R)
• M24: 7,332,540 km (0.076 R)
• M25: 7,450,572 km (0.095 R)
• M26: 7,728,525 km (0.118 R)
• M27: 7,888,745 km (0.084 R)
• M28: 8,212,774 km (0.055 R)
• M29: 9,809,880 km (0.049 R)
• M30: 10,821,760 km (0.031 R)
• M31: 11,590,843 km (0.03 R)
• M32: 11,682,547 km (0.1 R)
• M33: 12,051,455 km (0.056 R)
• M34: 12,706,394 km (0.119 R)
• M35: 13,420,724 km (0.108 R)
• M36: 13,468,895 km (0.085 R)
• M37: 14,050,382 km (0.051 R)
• M38: 14,987,911 km (0.098 R)
• M39: 15,187,774 km (0.079 R)
• M40: 15,438,949 km (0.065 R)
• M41: 15,590,342 km (0.108 R)
• M42: 16,405,800 km (0.119 R)
• M43: 16,818,840 km (0.119 R)
• M44: 19,042,163 km (0.11 R)
• M45: 19,476,147 km (0.096 R)
• M46: 20,519,592 km (0.117 R)
• M47: 21,412,242 km (0.114 R)
• M48: 22,203,765 km (0.031 R)
• M49: 22,317,609 km (0.101 R)
• M50: 22,603,041 km (0.074 R)
• M51: 22,947,266 km (0.079 R)
• M52: 23,177,647 km (0.111 R)
• M53: 23,524,714 km (0.05 R)
• M54: 25,583,181 km (0.086 R)
• M55: 25,642,870 km (0.117 R)
• M56: 26,362,286 km (0.103 R)
• M57: 26,724,612 km (0.12 R)
• M58: 27,454,052 km (0.088 R)
• M59: 27,698,644 km (0.099 R)
• M60: 27,943,835 km (0.104 R)
• M61: 28,005,320 km (0.033 R)
• M62: 28,189,924 km (0.036 R)
• M63: 28,374,976 km (0.105 R)
• M64: 28,808,212 km (0.12 R)
• M65: 29,305,924 km (0.11 R)
• M66: 29,555,902 km (0.076 R)
• M67: 29,743,946 km (0.05 R)
• M68: 30,373,155 km (0.062 R)
• M69: 32,934,121 km (0.12 R)
• M70: 34,767,443 km (0.047 R)
• M71: 35,098,353 km (0.109 R)
• M72: 35,297,318 km (0.085 R)
• M73: 35,629,874 km (0.052 R)
• M74: 36,365,148 km (0.109 R)
• M75: 36,432,168 km (0.079 R)
• M76: 36,499,337 km (0.075 R)
• M77: 36,970,421 km (0.111 R)
• M78: 37,511,217 km (0.083 R)
• M79: 37,918,572 km (0.062 R)
• M80: 40,254,244 km (0.075 R)
• M81: 40,393,071 km (0.057 R)
• M82: 40,880,311 km (0.117 R)
• M83: 41,159,610 km (0.062 R)
• M84: 41,299,484 km (0.084 R)
• M85: 41,930,787 km (0.097 R)
• M86: 42,212,480 km (0.098 R)
• M87: 42,353,551 km (0.113 R)
• M88: 42,565,381 km (0.101 R)
• M89: 43,345,385 km (0.095 R)
• M90: 45,207,429 km (0.081 R)
• M91: 45,279,536 km (0.049 R)
• M92: 46,148,250 km (0.103 R)
• M93: 46,876,343 km (0.094 R)
• M94: 47,608,176 km (0.09 R)
• M95: 48,196,395 km (0.059 R)

Planet 6 - Ice Giant

Semi-Major Axis: 10.41 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 293.8

Radius: 4.1

Gravity: 17.48 G

Time & Orbit

Eccentricity (e): 0.066

Orbit Range: 9.72 AU - 11.1 AU

Year: 23184 Days

Day: 20.6 Hours

Environment

Temp: -240 °C

Axial Tilt: 35 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (92)

Outer Limit: 63,320,657 km

• M1: 105,018 km (0.113 R)
• M2: 229,932 km (0.11 R)
• M3: 483,201 km (0.08 R)
• M4: 576,251 km (0.106 R)
• M5: 822,938 km (0.084 R)
• M6: 1,051,523 km (0.107 R)
• M7: 1,123,779 km (0.11 R)
• M8: 1,222,813 km (0.074 R)
• M9: 1,455,886 km (0.114 R)
• M10: 1,563,896 km (0.048 R)
• M11: 1,787,844 km (0.101 R)
• M12: 2,021,815 km (0.03 R)
• M13: 2,359,308 km (0.061 R)
• M14: 2,486,317 km (0.094 R)
• M15: 2,813,637 km (0.103 R)
• M16: 3,050,899 km (0.082 R)
• M17: 3,874,585 km (0.091 R)
• M18: 4,882,725 km (0.108 R)
• M19: 5,044,739 km (0.077 R)
• M20: 5,167,260 km (0.103 R)
• M21: 5,457,330 km (0.056 R)
• M22: 5,880,543 km (0.116 R)
• M23: 6,579,763 km (0.052 R)
• M24: 6,893,769 km (0.078 R)
• M25: 7,121,158 km (0.118 R)
• M26: 7,770,712 km (0.063 R)
• M27: 7,959,654 km (0.12 R)
• M28: 8,390,645 km (0.111 R)
• M29: 8,584,524 km (0.044 R)
• M30: 9,728,050 km (0.068 R)
• M31: 10,551,437 km (0.055 R)
• M32: 10,918,550 km (0.115 R)
• M33: 12,154,229 km (0.086 R)
• M34: 12,208,981 km (0.057 R)
• M35: 12,373,689 km (0.09 R)
• M36: 12,538,994 km (0.043 R)
• M37: 14,464,169 km (0.084 R)
• M38: 15,877,420 km (0.073 R)
• M39: 16,057,087 km (0.114 R)
• M40: 16,117,076 km (0.07 R)
• M41: 16,177,215 km (0.102 R)
• M42: 16,600,277 km (0.06 R)
• M43: 16,843,673 km (0.05 R)
• M44: 16,965,895 km (0.094 R)
• M45: 17,088,266 km (0.103 R)
• M46: 17,519,107 km (0.104 R)
• M47: 18,015,772 km (0.103 R)
• M48: 18,391,263 km (0.085 R)
• M49: 19,405,387 km (0.119 R)
• M50: 19,533,443 km (0.106 R)
• M51: 21,421,218 km (0.093 R)
• M52: 23,502,424 km (0.072 R)
• M53: 24,740,197 km (0.11 R)
• M54: 26,281,504 km (0.107 R)
• M55: 27,493,695 km (0.1 R)
• M56: 28,070,395 km (0.099 R)
• M57: 29,162,459 km (0.063 R)
• M58: 30,046,134 km (0.101 R)
• M59: 30,714,537 km (0.108 R)
• M60: 31,764,116 km (0.118 R)
• M61: 32,066,154 km (0.09 R)
• M62: 32,673,073 km (0.083 R)
• M63: 33,513,813 km (0.09 R)
• M64: 33,744,343 km (0.061 R)
• M65: 34,206,900 km (0.108 R)
• M66: 37,105,657 km (0.051 R)
• M67: 37,264,530 km (0.12 R)
• M68: 37,423,703 km (0.103 R)
• M69: 38,303,039 km (0.113 R)
• M70: 39,756,532 km (0.114 R)
• M71: 40,082,057 km (0.071 R)
• M72: 40,571,840 km (0.113 R)
• M73: 43,050,677 km (0.114 R)
• M74: 43,971,751 km (0.103 R)
• M75: 46,516,710 km (0.066 R)
• M76: 46,859,588 km (0.054 R)
• M77: 47,634,206 km (0.094 R)
• M78: 48,934,660 km (0.039 R)
• M79: 49,021,726 km (0.12 R)
• M80: 49,545,468 km (0.081 R)
• M81: 50,334,597 km (0.079 R)
• M82: 52,102,994 km (0.101 R)
• M83: 53,711,769 km (0.054 R)
• M84: 55,246,194 km (0.081 R)
• M85: 58,265,678 km (0.104 R)
• M86: 58,635,185 km (0.07 R)
• M87: 58,727,786 km (0.062 R)
• M88: 59,098,340 km (0.107 R)
• M89: 59,469,791 km (0.065 R)
• M90: 60,588,484 km (0.088 R)
• M91: 61,526,014 km (0.104 R)
• M92: 61,808,305 km (0.061 R)

Kuiper Belt

Range: 30 - 51 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 393 - 18,815 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit