🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.78 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.86

Radius: 1.72

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.148

Orbit Range: 0.66 AU - 0.9 AU

Year: 291 Days

Day: 38 Hours

Environment

Temp: -15 °C

Axial Tilt: 15.6 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Satellites (2)

Outer Limit: 59,188,693 km

• M1: 179,368 km (0.103 R)
• M2: 394,340 km (0.062 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1.44 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.62

Radius: 1.21

Gravity: 1.11 G

Time & Orbit

Eccentricity (e): 0.069

Orbit Range: 1.34 AU - 1.54 AU

Year: 729 Days

Day: 32.9 Hours

Environment

Temp: -75 °C

Axial Tilt: 34.2 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 59,188,693 km

• M1: 116,088 km (0.073 R)

Asteroid Belt

Center: 3.14 AU

Composition

Type: Main (Rocky/Icy Mix)

A dense region of planetesimals and debris.

Boundary

Planet 3 - Gas Giant

Semi-Major Axis: 4.83 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 64.1

Radius: 9

Gravity: 0.79 G

Time & Orbit

Eccentricity (e): 0.195

Orbit Range: 3.89 AU - 5.77 AU

Year: 4477 Days

Day: 5.1 Hours

Environment

Temp: -171 °C

Axial Tilt: 4.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (58)

Outer Limit: 59,188,693 km

• M1: 115,190 km (0.104 R)
• M2: 194,627 km (0.072 R)
• M3: 297,401 km (0.057 R)
• M4: 381,624 km (0.099 R)
• M5: 511,176 km (0.095 R)
• M6: 572,511 km (0.091 R)
• M7: 689,945 km (0.062 R)
• M8: 816,206 km (0.072 R)
• M9: 889,659 km (0.044 R)
• M10: 988,992 km (0.076 R)
• M11: 1,124,527 km (0.091 R)
• M12: 1,182,272 km (0.116 R)
• M13: 1,326,784 km (0.049 R)
• M14: 1,540,858 km (0.116 R)
• M15: 1,633,459 km (0.091 R)
• M16: 1,689,858 km (0.039 R)
• M17: 1,804,749 km (0.095 R)
• M18: 1,952,252 km (0.081 R)
• M19: 2,022,414 km (0.116 R)
• M20: 2,165,429 km (0.108 R)
• M21: 2,259,227 km (0.118 R)
• M22: 2,505,016 km (0.092 R)
• M23: 2,703,383 km (0.107 R)
• M24: 2,872,728 km (0.034 R)
• M25: 3,329,450 km (0.116 R)
• M26: 3,474,560 km (0.108 R)
• M27: 3,560,130 km (0.03 R)
• M28: 3,783,629 km (0.029 R)
• M29: 3,986,185 km (0.092 R)
• M30: 4,257,555 km (0.081 R)
• M31: 4,388,902 km (0.092 R)
• M32: 4,494,818 km (0.115 R)
• M33: 5,121,034 km (0.105 R)
• M34: 5,430,253 km (0.052 R)
• M35: 5,630,265 km (0.067 R)
• M36: 5,949,507 km (0.093 R)
• M37: 6,008,150 km (0.078 R)
• M38: 6,394,112 km (0.101 R)
• M39: 6,834,379 km (0.118 R)
• M40: 7,081,365 km (0.099 R)
• M41: 7,252,954 km (0.033 R)
• M42: 7,536,741 km (0.053 R)
• M43: 8,525,134 km (0.095 R)
• M44: 9,110,660 km (0.086 R)
• M45: 9,263,250 km (0.114 R)
• M46: 9,640,087 km (0.089 R)
• M47: 9,760,962 km (0.078 R)
• M48: 9,899,789 km (0.111 R)
• M49: 10,267,351 km (0.116 R)
• M50: 10,585,994 km (0.099 R)
• M51: 10,854,074 km (0.065 R)
• M52: 11,070,093 km (0.069 R)
• M53: 11,287,608 km (0.062 R)
• M54: 11,396,815 km (0.081 R)
• M55: 11,689,877 km (0.098 R)
• M56: 11,800,430 km (0.05 R)
• M57: 12,115,632 km (0.101 R)
• M58: 12,621,872 km (0.087 R)

Planet 4 - Gas Giant

Semi-Major Axis: 7.91 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 273

Radius: 14.9

Gravity: 1.23 G

Time & Orbit

Eccentricity (e): 0.163

Orbit Range: 6.62 AU - 9.2 AU

Year: 9383 Days

Day: 8.4 Hours

Environment

Temp: -188 °C

Axial Tilt: 29.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 59,188,693 km

• M1: 193,879 km (0.086 R)
• M2: 454,329 km (0.1 R)
• M3: 607,218 km (0.066 R)
• M4: 729,738 km (0.093 R)
• M5: 903,721 km (0.09 R)
• M6: 1,003,802 km (0.084 R)
• M7: 1,123,480 km (0.075 R)
• M8: 1,984,416 km (0.094 R)
• M9: 2,237,087 km (0.066 R)
• M10: 2,377,559 km (0.117 R)
• M11: 2,731,508 km (0.045 R)
• M12: 3,192,568 km (0.116 R)
• M13: 3,328,852 km (0.041 R)
• M14: 3,490,418 km (0.092 R)
• M15: 3,821,627 km (0.104 R)
• M16: 4,362,872 km (0.106 R)
• M17: 4,591,308 km (0.118 R)
• M18: 4,981,160 km (0.107 R)
• M19: 5,220,218 km (0.066 R)
• M20: 5,354,706 km (0.063 R)
• M21: 6,016,527 km (0.061 R)
• M22: 6,300,015 km (0.082 R)
• M23: 6,443,479 km (0.059 R)
• M24: 6,880,305 km (0.058 R)
• M25: 7,117,268 km (0.063 R)
• M26: 7,357,074 km (0.11 R)
• M27: 7,629,940 km (0.106 R)
• M28: 7,782,979 km (0.115 R)
• M29: 8,563,730 km (0.117 R)
• M30: 8,979,612 km (0.093 R)
• M31: 9,500,811 km (0.093 R)
• M32: 10,199,583 km (0.105 R)
• M33: 10,470,355 km (0.097 R)
• M34: 10,674,855 km (0.113 R)
• M35: 11,541,476 km (0.11 R)
• M36: 12,683,805 km (0.065 R)
• M37: 12,829,065 km (0.12 R)
• M38: 13,378,986 km (0.063 R)
• M39: 13,675,489 km (0.105 R)
• M40: 14,049,185 km (0.117 R)
• M41: 14,350,625 km (0.074 R)
• M42: 14,540,015 km (0.114 R)
• M43: 14,654,159 km (0.051 R)
• M44: 15,538,581 km (0.09 R)
• M45: 15,733,208 km (0.047 R)
• M46: 16,837,839 km (0.045 R)
• M47: 17,278,704 km (0.077 R)
• M48: 17,561,294 km (0.066 R)
• M49: 17,886,071 km (0.038 R)
• M50: 18,212,793 km (0.038 R)
• M51: 18,335,912 km (0.103 R)
• M52: 18,624,037 km (0.1 R)
• M53: 19,038,423 km (0.105 R)
• M54: 19,581,613 km (0.104 R)
• M55: 19,960,694 km (0.053 R)
• M56: 20,854,691 km (0.089 R)
• M57: 21,457,870 km (0.093 R)
• M58: 22,285,894 km (0.102 R)
• M59: 23,391,123 km (0.105 R)
• M60: 23,614,323 km (0.108 R)
• M61: 24,152,875 km (0.063 R)
• M62: 24,468,976 km (0.032 R)
• M63: 25,196,470 km (0.106 R)
• M64: 25,562,985 km (0.098 R)
• M65: 26,347,626 km (0.115 R)
• M66: 26,533,277 km (0.061 R)
• M67: 26,719,526 km (0.107 R)
• M68: 27,609,933 km (0.096 R)
• M69: 28,414,919 km (0.107 R)
• M70: 28,939,858 km (0.077 R)
• M71: 29,083,621 km (0.037 R)
• M72: 30,047,929 km (0.114 R)
• M73: 30,339,196 km (0.107 R)
• M74: 30,631,510 km (0.03 R)
• M75: 30,729,198 km (0.081 R)
• M76: 30,826,885 km (0.081 R)
• M77: 30,924,722 km (0.12 R)
• M78: 31,513,988 km (0.101 R)
• M79: 31,612,573 km (0.099 R)
• M80: 32,305,511 km (0.058 R)
• M81: 33,253,811 km (0.118 R)

Planet 5 - Ice Giant

Semi-Major Axis: 10.65 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 767.3

Radius: 6.1

Gravity: 20.62 G

Time & Orbit

Eccentricity (e): 0.005

Orbit Range: 10.6 AU - 10.7 AU

Year: 14658 Days

Day: 20.5 Hours

Environment

Temp: -188 °C

Axial Tilt: 32.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 59,188,693 km

• M1: 86,468 km (0.115 R)
• M2: 285,283 km (0.105 R)
• M3: 514,168 km (0.057 R)
• M4: 628,161 km (0.099 R)
• M5: 729,589 km (0.093 R)
• M6: 995,275 km (0.05 R)
• M7: 1,163,722 km (0.111 R)
• M8: 1,610,122 km (0.088 R)
• M9: 1,665,922 km (0.104 R)
• M10: 2,227,811 km (0.057 R)
• M11: 2,290,044 km (0.1 R)
• M12: 2,610,782 km (0.064 R)
• M13: 2,709,666 km (0.1 R)
• M14: 2,776,387 km (0.057 R)
• M15: 3,293,846 km (0.093 R)
• M16: 3,915,575 km (0.108 R)
• M17: 4,067,117 km (0.08 R)
• M18: 5,098,595 km (0.08 R)
• M19: 5,181,173 km (0.118 R)
• M20: 5,814,570 km (0.097 R)
• M21: 5,987,505 km (0.066 R)
• M22: 6,031,038 km (0.115 R)
• M23: 6,651,421 km (0.052 R)
• M24: 6,832,434 km (0.1 R)
• M25: 8,532,913 km (0.075 R)
• M26: 9,684,069 km (0.047 R)
• M27: 9,837,706 km (0.108 R)
• M28: 10,044,001 km (0.119 R)
• M29: 10,830,138 km (0.039 R)
• M30: 11,257,389 km (0.119 R)
• M31: 13,761,658 km (0.114 R)
• M32: 14,282,408 km (0.101 R)
• M33: 15,224,127 km (0.103 R)
• M34: 16,003,980 km (0.104 R)
• M35: 16,185,742 km (0.118 R)
• M36: 16,551,359 km (0.12 R)
• M37: 17,043,237 km (0.06 R)
• M38: 17,477,519 km (0.065 R)
• M39: 17,978,223 km (0.109 R)
• M40: 18,420,285 km (0.116 R)
• M41: 18,738,180 km (0.095 R)
• M42: 18,865,787 km (0.078 R)
• M43: 19,573,236 km (0.099 R)
• M44: 20,420,409 km (0.114 R)
• M45: 20,617,579 km (0.086 R)
• M46: 21,279,400 km (0.075 R)
• M47: 21,479,412 km (0.114 R)
• M48: 22,015,571 km (0.099 R)
• M49: 22,150,358 km (0.065 R)
• M50: 22,285,296 km (0.115 R)
• M51: 23,375,266 km (0.106 R)
• M52: 23,857,569 km (0.111 R)
• M53: 25,323,928 km (0.102 R)
• M54: 25,394,538 km (0.09 R)
• M55: 25,535,908 km (0.052 R)
• M56: 26,317,706 km (0.08 R)
• M57: 29,078,685 km (0.069 R)
• M58: 29,820,391 km (0.093 R)
• M59: 31,095,713 km (0.085 R)
• M60: 31,171,260 km (0.074 R)
• M61: 31,625,887 km (0.102 R)
• M62: 31,930,170 km (0.098 R)
• M63: 32,618,619 km (0.097 R)
• M64: 33,389,048 km (0.071 R)
• M65: 34,087,670 km (0.1 R)
• M66: 35,341,450 km (0.07 R)
• M67: 38,785,193 km (0.064 R)
• M68: 39,029,336 km (0.062 R)
• M69: 39,601,249 km (0.109 R)
• M70: 40,422,990 km (0.105 R)
• M71: 41,001,485 km (0.116 R)
• M72: 41,582,823 km (0.075 R)
• M73: 42,166,703 km (0.119 R)
• M74: 42,417,878 km (0.107 R)
• M75: 45,985,338 km (0.106 R)
• M76: 48,504,267 km (0.046 R)
• M77: 50,711,285 km (0.053 R)
• M78: 51,156,637 km (0.086 R)
• M79: 51,424,418 km (0.064 R)
• M80: 53,041,271 km (0.104 R)
• M81: 53,131,479 km (0.104 R)
• M82: 54,401,266 km (0.085 R)
• M83: 56,508,651 km (0.037 R)
• M84: 56,693,255 km (0.036 R)
• M85: 57,340,565 km (0.1 R)
• M86: 57,990,418 km (0.108 R)
• M87: 59,578,848 km (0.068 R)
• M88: 59,954,638 km (0.109 R)
• M89: 60,519,819 km (0.096 R)
• M90: 60,803,007 km (0.117 R)
• M91: 63,372,201 km (0.085 R)
• M92: 64,044,045 km (0.049 R)
• M93: 64,140,087 km (0.088 R)

Planet 6 - Ice Giant

Semi-Major Axis: 11.19 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 583.6

Radius: 4.7

Gravity: 26.42 G

Time & Orbit

Eccentricity (e): 0.08

Orbit Range: 10.29 AU - 12.09 AU

Year: 15787 Days

Day: 20.7 Hours

Environment

Temp: -191 °C

Axial Tilt: 0.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 59,188,693 km

• M1: 94,546 km (0.096 R)
• M2: 160,369 km (0.102 R)
• M3: 232,475 km (0.097 R)
• M4: 346,768 km (0.093 R)
• M5: 985,700 km (0.112 R)
• M6: 1,503,758 km (0.077 R)
• M7: 1,556,865 km (0.069 R)
• M8: 2,585,201 km (0.085 R)
• M9: 2,617,065 km (0.043 R)
• M10: 3,352,039 km (0.028 R)
• M11: 3,705,988 km (0.116 R)
• M12: 3,960,753 km (0.066 R)
• M13: 4,109,005 km (0.075 R)
• M14: 4,259,051 km (0.108 R)
• M15: 4,296,750 km (0.051 R)
• M16: 4,410,893 km (0.095 R)
• M17: 4,487,338 km (0.108 R)
• M18: 4,641,872 km (0.115 R)
• M19: 6,151,764 km (0.119 R)
• M20: 8,360,127 km (0.117 R)
• M21: 8,789,922 km (0.115 R)
• M22: 9,275,816 km (0.03 R)
• M23: 9,571,571 km (0.098 R)
• M24: 10,121,792 km (0.109 R)
• M25: 10,426,224 km (0.073 R)
• M26: 10,630,724 km (0.073 R)
• M27: 10,992,003 km (0.096 R)
• M28: 11,200,243 km (0.088 R)
• M29: 11,992,813 km (0.102 R)
• M30: 12,261,041 km (0.097 R)
• M31: 12,912,690 km (0.111 R)
• M32: 13,408,756 km (0.088 R)
• M33: 16,276,398 km (0.114 R)
• M34: 16,335,639 km (0.115 R)
• M35: 20,208,428 km (0.118 R)
• M36: 20,335,736 km (0.087 R)
• M37: 21,429,297 km (0.104 R)
• M38: 21,754,672 km (0.079 R)
• M39: 21,885,271 km (0.099 R)
• M40: 22,016,019 km (0.101 R)
• M41: 23,072,031 km (0.094 R)
• M42: 23,807,454 km (0.072 R)
• M43: 24,076,880 km (0.1 R)
• M44: 24,211,967 km (0.078 R)
• M45: 24,822,775 km (0.087 R)
• M46: 25,027,574 km (0.09 R)
• M47: 25,301,488 km (0.094 R)
• M48: 25,852,158 km (0.116 R)
• M49: 25,990,536 km (0.027 R)
• M50: 26,059,799 km (0.027 R)
• M51: 26,267,890 km (0.049 R)
• M52: 27,669,323 km (0.099 R)
• M53: 28,736,105 km (0.103 R)
• M54: 28,879,420 km (0.068 R)
• M55: 29,599,285 km (0.114 R)
• M56: 30,397,988 km (0.106 R)
• M57: 31,203,872 km (0.09 R)
• M58: 31,424,828 km (0.062 R)
• M59: 31,572,331 km (0.106 R)
• M60: 34,040,995 km (0.025 R)
• M61: 34,877,547 km (0.05 R)
• M62: 35,030,286 km (0.085 R)
• M63: 35,259,919 km (0.053 R)
• M64: 39,239,821 km (0.114 R)
• M65: 39,398,843 km (0.117 R)
• M66: 39,478,429 km (0.067 R)
• M67: 41,242,039 km (0.08 R)
• M68: 42,296,255 km (0.115 R)
• M69: 42,459,316 km (0.119 R)
• M70: 43,441,576 km (0.067 R)
• M71: 44,596,920 km (0.047 R)
• M72: 44,928,878 km (0.081 R)
• M73: 46,013,463 km (0.09 R)
• M74: 46,685,157 km (0.12 R)
• M75: 47,868,327 km (0.036 R)
• M76: 48,634,118 km (0.107 R)
• M77: 49,747,575 km (0.089 R)
• M78: 50,609,708 km (0.101 R)
• M79: 51,563,843 km (0.109 R)
• M80: 52,436,298 km (0.067 R)
• M81: 52,698,992 km (0.102 R)
• M82: 52,874,320 km (0.054 R)
• M83: 53,049,799 km (0.059 R)
• M84: 53,842,368 km (0.046 R)
• M85: 55,260,705 km (0.087 R)
• M86: 55,617,197 km (0.098 R)
• M87: 55,974,586 km (0.096 R)
• M88: 57,050,943 km (0.106 R)
• M89: 57,321,117 km (0.103 R)
• M90: 57,591,739 km (0.049 R)
• M91: 58,224,838 km (0.108 R)
• M92: 60,688,116 km (0.09 R)
• M93: 60,871,972 km (0.101 R)
• M94: 61,332,285 km (0.11 R)

Planet 7 - Ice Giant

Semi-Major Axis: 11.39 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 490.7

Radius: 5.1

Gravity: 18.87 G

Time & Orbit

Eccentricity (e): 0.078

Orbit Range: 10.5 AU - 12.28 AU

Year: 16212 Days

Day: 16.7 Hours

Environment

Temp: -206 °C

Axial Tilt: 19.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 59,188,693 km

• M1: 97,987 km (0.11 R)
• M2: 131,646 km (0.106 R)
• M3: 724,502 km (0.092 R)
• M4: 1,088,773 km (0.107 R)
• M5: 1,181,973 km (0.07 R)
• M6: 1,351,467 km (0.089 R)
• M7: 1,877,304 km (0.102 R)
• M8: 2,220,481 km (0.106 R)
• M9: 2,279,572 km (0.116 R)
• M10: 2,802,866 km (0.105 R)
• M11: 3,127,493 km (0.114 R)
• M12: 3,327,954 km (0.029 R)
• M13: 3,812,053 km (0.101 R)
• M14: 3,918,567 km (0.078 R)
• M15: 4,026,127 km (0.105 R)
• M16: 4,098,533 km (0.109 R)
• M17: 4,134,736 km (0.104 R)
• M18: 4,317,843 km (0.09 R)
• M19: 4,466,244 km (0.08 R)
• M20: 4,998,813 km (0.064 R)
• M21: 5,631,761 km (0.063 R)
• M22: 5,753,235 km (0.085 R)
• M23: 5,998,875 km (0.098 R)
• M24: 6,289,693 km (0.114 R)
• M25: 6,457,990 km (0.087 R)
• M26: 6,842,008 km (0.049 R)
• M27: 7,632,184 km (0.104 R)
• M28: 7,721,793 km (0.077 R)
• M29: 8,358,482 km (0.094 R)
• M30: 8,776,608 km (0.083 R)
• M31: 8,870,555 km (0.079 R)
• M32: 9,876,003 km (0.097 R)
• M33: 12,044,723 km (0.101 R)
• M34: 12,516,555 km (0.065 R)
• M35: 12,675,128 km (0.112 R)
• M36: 12,781,343 km (0.111 R)
• M37: 13,586,628 km (0.067 R)
• M38: 14,741,524 km (0.106 R)
• M39: 15,021,122 km (0.092 R)
• M40: 15,189,719 km (0.111 R)
• M41: 16,793,109 km (0.059 R)
• M42: 16,968,138 km (0.12 R)
• M43: 17,143,766 km (0.117 R)
• M44: 18,030,583 km (0.059 R)
• M45: 18,209,801 km (0.085 R)
• M46: 18,569,883 km (0.113 R)
• M47: 18,750,896 km (0.102 R)
• M48: 19,114,569 km (0.101 R)
• M49: 20,717,061 km (0.04 R)
• M50: 20,779,443 km (0.108 R)
• M51: 20,842,125 km (0.045 R)
• M52: 21,724,453 km (0.111 R)
• M53: 22,234,133 km (0.063 R)
• M54: 22,554,572 km (0.108 R)
• M55: 25,440,464 km (0.102 R)
• M56: 27,062,853 km (0.104 R)
• M57: 27,748,759 km (0.097 R)
• M58: 30,193,787 km (0.114 R)
• M59: 30,406,515 km (0.095 R)
• M60: 32,054,186 km (0.061 R)
• M61: 32,271,253 km (0.104 R)
• M62: 32,343,808 km (0.075 R)
• M63: 32,488,768 km (0.089 R)
• M64: 32,561,473 km (0.112 R)
• M65: 32,634,177 km (0.094 R)
• M66: 33,510,372 km (0.039 R)
• M67: 36,110,233 km (0.113 R)
• M68: 36,562,318 km (0.063 R)
• M69: 36,864,805 km (0.116 R)
• M70: 37,244,035 km (0.088 R)
• M71: 37,472,322 km (0.103 R)
• M72: 38,697,080 km (0.107 R)
• M73: 40,715,155 km (0.11 R)
• M74: 41,028,712 km (0.071 R)
• M75: 44,771,950 km (0.112 R)
• M76: 45,582,322 km (0.072 R)
• M77: 46,561,290 km (0.073 R)
• M78: 46,643,120 km (0.071 R)
• M79: 47,629,568 km (0.052 R)
• M80: 50,293,308 km (0.06 R)
• M81: 50,629,604 km (0.109 R)
• M82: 50,882,425 km (0.118 R)
• M83: 52,152,510 km (0.086 R)
• M84: 53,604,507 km (0.095 R)
• M85: 54,206,190 km (0.109 R)
• M86: 54,292,358 km (0.035 R)
• M87: 55,416,437 km (0.094 R)
• M88: 56,024,851 km (0.095 R)
• M89: 56,985,419 km (0.111 R)
• M90: 58,568,913 km (0.077 R)
• M91: 59,188,697 km (0.077 R)

Kuiper Belt

Range: 30 - 46 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 374 - 11,231 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit