🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 1.49 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.87

Radius: 1.52

Gravity: 1.24 G

Time & Orbit

Eccentricity (e): 0.075

Orbit Range: 1.38 AU - 1.6 AU

Year: 696 Days

Day: 23.7 Hours

Environment

Temp: -49 °C

Axial Tilt: 2.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 80,226,419 km

• M1: 49,666 km (0.114 R)

Planet 2 - Terrestrial

Semi-Major Axis: 2.05 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.42

Radius: 0.71

Gravity: 0.83 G

Time & Orbit

Eccentricity (e): 0.015

Orbit Range: 2.02 AU - 2.08 AU

Year: 1124 Days

Day: 17.5 Hours

Environment

Temp: -83 °C

Axial Tilt: 36.6 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 80,226,419 km

• M1: 732,581 km (0.087 R)

Planet 3 - Terrestrial

Semi-Major Axis: 2.63 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.99

Radius: 1

Gravity: 0.99 G

Time & Orbit

Eccentricity (e): 0.106

Orbit Range: 2.35 AU - 2.91 AU

Year: 1633 Days

Day: 30.4 Hours

Environment

Temp: -110 °C

Axial Tilt: 2.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 2.92 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.37

Radius: 1.13

Gravity: 1.07 G

Time & Orbit

Eccentricity (e): 0.043

Orbit Range: 2.79 AU - 3.05 AU

Year: 1910 Days

Day: 47.3 Hours

Environment

Temp: -117 °C

Axial Tilt: 28.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 80,226,419 km

• M1: 1,264,401 km (0.065 R)

Planet 5 - Terrestrial

Semi-Major Axis: 3.56 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.1

Radius: 1.57

Gravity: 1.26 G

Time & Orbit

Eccentricity (e): 0.191

Orbit Range: 2.88 AU - 4.24 AU

Year: 2572 Days

Day: 45.6 Hours

Environment

Temp: -135 °C

Axial Tilt: 16.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 6 - Gas Giant

Semi-Major Axis: 4.26 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 974.5

Radius: 9.5

Gravity: 10.8 G

Time & Orbit

Eccentricity (e): 0.208

Orbit Range: 3.37 AU - 5.15 AU

Year: 3367 Days

Day: 9.5 Hours

Environment

Temp: -147 °C

Axial Tilt: 47.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 80,226,419 km

• M1: 140,323 km (0.025 R)
• M2: 519,105 km (0.084 R)
• M3: 578,645 km (0.12 R)
• M4: 842,834 km (0.073 R)
• M5: 951,742 km (0.091 R)
• M6: 1,184,217 km (0.112 R)
• M7: 1,293,573 km (0.051 R)
• M8: 1,522,458 km (0.105 R)
• M9: 1,581,848 km (0.097 R)
• M10: 1,843,046 km (0.107 R)
• M11: 2,101,401 km (0.113 R)
• M12: 2,286,005 km (0.112 R)
• M13: 2,511,000 km (0.102 R)
• M14: 2,653,118 km (0.057 R)
• M15: 3,039,081 km (0.109 R)
• M16: 3,152,626 km (0.117 R)
• M17: 3,267,517 km (0.053 R)
• M18: 3,462,293 km (0.052 R)
• M19: 3,541,281 km (0.084 R)
• M20: 3,761,788 km (0.074 R)
• M21: 4,111,249 km (0.057 R)
• M22: 4,215,967 km (0.062 R)
• M23: 4,385,611 km (0.109 R)
• M24: 4,449,789 km (0.109 R)
• M25: 5,426,663 km (0.057 R)
• M26: 5,986,907 km (0.08 R)
• M27: 6,298,070 km (0.028 R)
• M28: 6,467,714 km (0.104 R)
• M29: 6,861,456 km (0.108 R)
• M30: 7,415,566 km (0.047 R)
• M31: 8,141,565 km (0.084 R)
• M32: 8,273,510 km (0.097 R)
• M33: 8,513,016 km (0.105 R)
• M34: 9,080,591 km (0.112 R)
• M35: 9,300,200 km (0.091 R)
• M36: 9,438,279 km (0.087 R)
• M37: 9,912,804 km (0.091 R)
• M38: 10,053,874 km (0.049 R)
• M39: 10,223,967 km (0.103 R)
• M40: 10,366,534 km (0.111 R)
• M41: 10,624,740 km (0.112 R)
• M42: 11,030,749 km (0.089 R)
• M43: 11,235,548 km (0.04 R)
• M44: 11,412,223 km (0.109 R)
• M45: 11,678,807 km (0.119 R)
• M46: 12,188,187 km (0.05 R)
• M47: 12,278,844 km (0.053 R)
• M48: 12,369,650 km (0.089 R)
• M49: 12,582,527 km (0.109 R)
• M50: 13,012,023 km (0.118 R)
• M51: 13,415,039 km (0.095 R)
• M52: 13,696,583 km (0.117 R)
• M53: 14,138,345 km (0.117 R)
• M54: 15,133,021 km (0.081 R)
• M55: 15,328,097 km (0.054 R)
• M56: 16,083,865 km (0.117 R)
• M57: 16,249,770 km (0.107 R)
• M58: 16,316,341 km (0.082 R)
• M59: 16,784,582 km (0.062 R)
• M60: 17,155,435 km (0.119 R)
• M61: 17,257,162 km (0.082 R)
• M62: 17,802,745 km (0.089 R)
• M63: 18,043,149 km (0.085 R)
• M64: 18,319,306 km (0.08 R)
• M65: 18,457,834 km (0.116 R)
• M66: 18,770,942 km (0.087 R)
• M67: 19,120,852 km (0.099 R)
• M68: 19,579,070 km (0.109 R)
• M69: 19,898,312 km (0.11 R)
• M70: 20,470,225 km (0.089 R)
• M71: 20,578,085 km (0.116 R)
• M72: 20,830,456 km (0.101 R)
• M73: 20,938,915 km (0.119 R)
• M74: 21,265,487 km (0.115 R)
• M75: 22,514,330 km (0.098 R)
• M76: 22,737,231 km (0.047 R)
• M77: 23,185,127 km (0.089 R)
• M78: 23,372,573 km (0.089 R)
• M79: 23,485,370 km (0.114 R)
• M80: 23,711,263 km (0.092 R)
• M81: 24,241,437 km (0.119 R)
• M82: 25,120,923 km (0.097 R)
• M83: 25,855,299 km (0.061 R)
• M84: 25,971,986 km (0.06 R)

Planet 7 - Gas Giant

Semi-Major Axis: 7.25 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 559.7

Radius: 15

Gravity: 2.49 G

Time & Orbit

Eccentricity (e): 0.104

Orbit Range: 6.5 AU - 8 AU

Year: 7474 Days

Day: 7.7 Hours

Environment

Temp: -167 °C

Axial Tilt: 32.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (76)

Outer Limit: 80,226,419 km

• M1: 234,869 km (0.068 R)
• M2: 387,010 km (0.074 R)
• M3: 480,359 km (0.098 R)
• M4: 660,175 km (0.093 R)
• M5: 823,387 km (0.069 R)
• M6: 925,712 km (0.115 R)
• M7: 1,064,538 km (0.08 R)
• M8: 1,313,021 km (0.095 R)
• M9: 1,675,047 km (0.047 R)
• M10: 2,007,903 km (0.087 R)
• M11: 2,214,048 km (0.051 R)
• M12: 2,319,814 km (0.112 R)
• M13: 2,692,612 km (0.116 R)
• M14: 2,967,423 km (0.092 R)
• M15: 3,108,494 km (0.087 R)
• M16: 3,545,021 km (0.099 R)
• M17: 3,669,935 km (0.103 R)
• M18: 3,847,208 km (0.059 R)
• M19: 4,263,390 km (0.111 R)
• M20: 4,585,175 km (0.118 R)
• M21: 5,054,762 km (0.112 R)
• M22: 5,482,014 km (0.06 R)
• M23: 5,627,124 km (0.106 R)
• M24: 6,402,190 km (0.05 R)
• M25: 6,555,229 km (0.071 R)
• M26: 6,833,631 km (0.084 R)
• M27: 7,402,252 km (0.115 R)
• M28: 7,530,757 km (0.093 R)
• M29: 8,019,194 km (0.103 R)
• M30: 8,417,423 km (0.099 R)
• M31: 8,992,627 km (0.115 R)
• M32: 9,510,984 km (0.117 R)
• M33: 10,039,064 km (0.072 R)
• M34: 10,217,235 km (0.057 R)
• M35: 11,680,153 km (0.064 R)
• M36: 11,867,599 km (0.101 R)
• M37: 13,599,942 km (0.113 R)
• M38: 13,757,619 km (0.107 R)
• M39: 14,314,871 km (0.071 R)
• M40: 14,475,389 km (0.082 R)
• M41: 14,960,685 km (0.119 R)
• M42: 15,574,784 km (0.077 R)
• M43: 15,822,668 km (0.051 R)
• M44: 15,988,721 km (0.118 R)
• M45: 16,238,849 km (0.104 R)
• M46: 16,827,666 km (0.08 R)
• M47: 18,679,688 km (0.034 R)
• M48: 19,385,341 km (0.05 R)
• M49: 19,652,074 km (0.084 R)
• M50: 20,641,065 km (0.039 R)
• M51: 21,278,801 km (0.109 R)
• M52: 21,784,442 km (0.05 R)
• M53: 22,247,597 km (0.091 R)
• M54: 23,042,410 km (0.075 R)
• M55: 23,325,150 km (0.112 R)
• M56: 25,190,935 km (0.091 R)
• M57: 25,385,113 km (0.093 R)
• M58: 25,921,421 km (0.087 R)
• M59: 27,203,774 km (0.107 R)
• M60: 27,303,407 km (0.114 R)
• M61: 27,552,637 km (0.045 R)
• M62: 29,420,964 km (0.055 R)
• M63: 29,727,790 km (0.077 R)
• M64: 29,933,038 km (0.111 R)
• M65: 30,087,124 km (0.104 R)
• M66: 30,447,954 km (0.092 R)
• M67: 31,017,772 km (0.084 R)
• M68: 31,538,821 km (0.119 R)
• M69: 32,062,863 km (0.075 R)
• M70: 32,589,747 km (0.086 R)
• M71: 32,801,278 km (0.112 R)
• M72: 33,172,580 km (0.115 R)
• M73: 34,833,715 km (0.069 R)
• M74: 35,266,800 km (0.072 R)
• M75: 35,429,713 km (0.083 R)
• M76: 35,756,135 km (0.113 R)

Planet 8 - Gas Giant

Semi-Major Axis: 7.54 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 72.8

Radius: 10

Gravity: 0.73 G

Time & Orbit

Eccentricity (e): 0.11

Orbit Range: 6.71 AU - 8.37 AU

Year: 7927 Days

Day: 10.5 Hours

Environment

Temp: -179 °C

Axial Tilt: 3.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (47)

Outer Limit: 80,226,419 km

• M1: 140,921 km (0.1 R)
• M2: 296,653 km (0.093 R)
• M3: 497,712 km (0.106 R)
• M4: 578,046 km (0.082 R)
• M5: 1,019,659 km (0.115 R)
• M6: 1,246,898 km (0.031 R)
• M7: 1,396,047 km (0.036 R)
• M8: 1,801,158 km (0.078 R)
• M9: 2,131,919 km (0.098 R)
• M10: 2,850,438 km (0.055 R)
• M11: 3,142,004 km (0.07 R)
• M12: 3,638,669 km (0.116 R)
• M13: 3,854,240 km (0.071 R)
• M14: 4,006,081 km (0.048 R)
• M15: 4,142,664 km (0.078 R)
• M16: 4,939,572 km (0.107 R)
• M17: 5,215,879 km (0.108 R)
• M18: 5,327,779 km (0.038 R)
• M19: 5,497,123 km (0.098 R)
• M20: 6,133,363 km (0.115 R)
• M21: 6,530,246 km (0.104 R)
• M22: 7,307,557 km (0.102 R)
• M23: 7,834,740 km (0.087 R)
• M24: 8,027,571 km (0.108 R)
• M25: 8,135,431 km (0.079 R)
• M26: 9,443,814 km (0.089 R)
• M27: 9,694,989 km (0.07 R)
• M28: 10,674,107 km (0.07 R)
• M29: 11,055,432 km (0.052 R)
• M30: 11,271,900 km (0.066 R)
• M31: 11,684,641 km (0.091 R)
• M32: 12,003,584 km (0.115 R)
• M33: 12,077,485 km (0.082 R)
• M34: 12,549,765 km (0.058 R)
• M35: 12,851,205 km (0.093 R)
• M36: 13,180,470 km (0.105 R)
• M37: 13,358,940 km (0.109 R)
• M38: 13,563,889 km (0.055 R)
• M39: 13,666,663 km (0.036 R)
• M40: 15,400,951 km (0.069 R)
• M41: 15,588,996 km (0.119 R)
• M42: 15,669,779 km (0.112 R)
• M43: 16,732,971 km (0.064 R)
• M44: 17,454,481 km (0.061 R)
• M45: 17,706,703 km (0.11 R)
• M46: 18,413,553 km (0.114 R)
• M47: 18,985,615 km (0.096 R)

Planet 9 - Gas Giant

Semi-Major Axis: 7.68 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 723.2

Radius: 12.9

Gravity: 4.35 G

Time & Orbit

Eccentricity (e): 0.175

Orbit Range: 6.34 AU - 9.02 AU

Year: 8149 Days

Day: 14.7 Hours

Environment

Temp: -175 °C

Axial Tilt: 18.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (81)

Outer Limit: 80,226,419 km

• M1: 171,140 km (0.101 R)
• M2: 359,184 km (0.074 R)
• M3: 525,537 km (0.073 R)
• M4: 606,619 km (0.11 R)
• M5: 896,091 km (0.059 R)
• M6: 1,422,227 km (0.07 R)
• M7: 2,406,431 km (0.12 R)
• M8: 2,575,776 km (0.074 R)
• M9: 2,799,425 km (0.068 R)
• M10: 3,055,537 km (0.041 R)
• M11: 3,186,584 km (0.113 R)
• M12: 3,319,427 km (0.073 R)
• M13: 3,563,421 km (0.061 R)
• M14: 3,869,648 km (0.11 R)
• M15: 4,126,807 km (0.091 R)
• M16: 4,809,272 km (0.096 R)
• M17: 5,148,261 km (0.034 R)
• M18: 5,655,248 km (0.115 R)
• M19: 5,849,576 km (0.071 R)
• M20: 6,717,094 km (0.089 R)
• M21: 7,767,720 km (0.1 R)
• M22: 8,906,758 km (0.081 R)
• M23: 10,215,590 km (0.117 R)
• M24: 10,333,922 km (0.079 R)
• M25: 10,892,371 km (0.116 R)
• M26: 11,053,787 km (0.056 R)
• M27: 11,215,951 km (0.108 R)
• M28: 11,379,012 km (0.106 R)
• M29: 11,955,563 km (0.112 R)
• M30: 12,080,477 km (0.088 R)
• M31: 12,541,837 km (0.041 R)
• M32: 12,668,696 km (0.104 R)
• M33: 13,094,601 km (0.12 R)
• M34: 13,309,274 km (0.092 R)
• M35: 13,481,910 km (0.111 R)
• M36: 13,873,108 km (0.099 R)
• M37: 14,048,138 km (0.104 R)
• M38: 14,577,714 km (0.115 R)
• M39: 15,113,873 km (0.086 R)
• M40: 15,248,960 km (0.1 R)
• M41: 15,339,167 km (0.089 R)
• M42: 15,976,005 km (0.117 R)
• M43: 16,297,641 km (0.047 R)
• M44: 16,760,945 km (0.094 R)
• M45: 16,994,169 km (0.069 R)
• M46: 17,747,843 km (0.09 R)
• M47: 18,657,098 km (0.114 R)
• M48: 19,777,886 km (0.11 R)
• M49: 20,421,007 km (0.111 R)
• M50: 20,970,630 km (0.097 R)
• M51: 21,222,104 km (0.113 R)
• M52: 21,525,189 km (0.062 R)
• M53: 22,289,036 km (0.088 R)
• M54: 22,391,510 km (0.055 R)
• M55: 22,751,592 km (0.069 R)
• M56: 23,581,860 km (0.102 R)
• M57: 23,895,717 km (0.119 R)
• M58: 24,580,725 km (0.045 R)
• M59: 24,898,920 km (0.046 R)
• M60: 25,754,470 km (0.107 R)
• M61: 26,673,899 km (0.12 R)
• M62: 26,946,466 km (0.106 R)
• M63: 27,110,425 km (0.096 R)
• M64: 27,494,144 km (0.1 R)
• M65: 28,823,770 km (0.078 R)
• M66: 29,891,151 km (0.117 R)
• M67: 30,743,110 km (0.118 R)
• M68: 31,718,189 km (0.098 R)
• M69: 31,891,274 km (0.092 R)
• M70: 32,122,552 km (0.103 R)
• M71: 32,470,667 km (0.089 R)
• M72: 32,936,664 km (0.109 R)
• M73: 34,822,794 km (0.09 R)
• M74: 35,120,643 km (0.117 R)
• M75: 35,299,862 km (0.103 R)
• M76: 35,839,012 km (0.078 R)
• M77: 36,743,780 km (0.072 R)
• M78: 37,472,920 km (0.098 R)
• M79: 37,839,435 km (0.077 R)
• M80: 39,007,495 km (0.114 R)
• M81: 40,562,565 km (0.118 R)

Planet 10 - Ice Giant

Semi-Major Axis: 14.8 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 675.8

Radius: 7.1

Gravity: 13.41 G

Time & Orbit

Eccentricity (e): 0.241

Orbit Range: 11.23 AU - 18.37 AU

Year: 21800 Days

Day: 16.5 Hours

Environment

Temp: -195 °C

Axial Tilt: 39.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 80,226,419 km

• M1: 116,686 km (0.085 R)
• M2: 525,687 km (0.112 R)
• M3: 878,887 km (0.098 R)
• M4: 1,121,984 km (0.069 R)
• M5: 1,447,060 km (0.083 R)
• M6: 1,509,293 km (0.057 R)
• M7: 2,361,103 km (0.118 R)
• M8: 2,584,602 km (0.116 R)
• M9: 3,132,430 km (0.08 R)
• M10: 3,587,507 km (0.079 R)
• M11: 3,975,264 km (0.108 R)
• M12: 4,107,509 km (0.03 R)
• M13: 4,151,939 km (0.098 R)
• M14: 4,513,069 km (0.114 R)
• M15: 4,978,617 km (0.068 R)
• M16: 5,606,629 km (0.104 R)
• M17: 5,904,778 km (0.084 R)
• M18: 6,005,457 km (0.075 R)
• M19: 8,755,515 km (0.075 R)
• M20: 8,812,811 km (0.087 R)
• M21: 9,043,341 km (0.107 R)
• M22: 9,510,535 km (0.116 R)
• M23: 9,747,049 km (0.046 R)
• M24: 9,806,589 km (0.097 R)
• M25: 9,985,658 km (0.114 R)
• M26: 10,346,937 km (0.101 R)
• M27: 11,519,335 km (0.069 R)
• M28: 11,708,277 km (0.078 R)
• M29: 12,538,845 km (0.046 R)
• M30: 13,987,102 km (0.026 R)
• M31: 14,323,697 km (0.072 R)
• M32: 14,459,083 km (0.087 R)
• M33: 14,662,835 km (0.072 R)
• M34: 14,731,052 km (0.111 R)
• M35: 15,626,694 km (0.099 R)
• M36: 16,327,560 km (0.043 R)
• M37: 16,398,320 km (0.069 R)
• M38: 17,470,339 km (0.116 R)
• M39: 17,905,519 km (0.12 R)
• M40: 18,491,194 km (0.029 R)
• M41: 18,712,450 km (0.113 R)
• M42: 18,786,351 km (0.094 R)
• M43: 19,232,153 km (0.044 R)
• M44: 19,982,835 km (0.051 R)
• M45: 21,049,916 km (0.102 R)
• M46: 22,291,878 km (0.032 R)
• M47: 22,763,710 km (0.077 R)
• M48: 23,398,005 km (0.079 R)
• M49: 23,877,466 km (0.112 R)
• M50: 24,602,866 km (0.061 R)
• M51: 25,090,405 km (0.11 R)
• M52: 26,323,241 km (0.078 R)
• M53: 27,239,827 km (0.099 R)
• M54: 29,619,630 km (0.091 R)
• M55: 32,508,814 km (0.12 R)
• M56: 33,222,695 km (0.09 R)
• M57: 33,491,672 km (0.1 R)
• M58: 33,581,580 km (0.065 R)
• M59: 34,484,254 km (0.066 R)
• M60: 34,847,627 km (0.094 R)
• M61: 35,029,688 km (0.109 R)
• M62: 35,395,006 km (0.044 R)
• M63: 35,945,227 km (0.069 R)
• M64: 36,868,545 km (0.115 R)
• M65: 37,706,143 km (0.11 R)
• M66: 38,361,980 km (0.118 R)
• M67: 38,456,077 km (0.087 R)
• M68: 38,738,518 km (0.113 R)
• M69: 40,256,637 km (0.089 R)
• M70: 42,764,646 km (0.061 R)
• M71: 43,840,853 km (0.085 R)
• M72: 44,234,445 km (0.06 R)
• M73: 46,620,381 km (0.107 R)
• M74: 49,661,108 km (0.072 R)
• M75: 50,688,995 km (0.049 R)
• M76: 51,619,942 km (0.1 R)
• M77: 54,129,895 km (0.095 R)
• M78: 54,340,978 km (0.075 R)
• M79: 56,893,716 km (0.118 R)
• M80: 57,430,473 km (0.086 R)
• M81: 57,538,034 km (0.112 R)
• M82: 58,942,309 km (0.107 R)
• M83: 59,376,592 km (0.089 R)
• M84: 60,030,185 km (0.1 R)
• M85: 62,004,877 km (0.063 R)
• M86: 63,666,759 km (0.109 R)
• M87: 68,169,655 km (0.073 R)
• M88: 68,968,059 km (0.109 R)
• M89: 69,769,605 km (0.116 R)
• M90: 70,229,169 km (0.116 R)
• M91: 71,729,187 km (0.099 R)
• M92: 72,076,852 km (0.118 R)
• M93: 75,820,090 km (0.077 R)
• M94: 77,002,811 km (0.111 R)
• M95: 78,072,436 km (0.111 R)

Kuiper Belt

Range: 30 - 54 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 293 - 11,819 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit