🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.58 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.06

Radius: 1.02

Gravity: 1.02 G

Time & Orbit

Eccentricity (e): 0.096

Orbit Range: 0.52 AU - 0.64 AU

Year: 166 Days

Day: 27.1 Hours

Environment

Temp: 135 °C

Axial Tilt: 13.8 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Planet 2 - Terrestrial

Semi-Major Axis: 1.83 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.51

Radius: 1.83

Gravity: 1.35 G

Time & Orbit

Eccentricity (e): 0.007

Orbit Range: 1.82 AU - 1.84 AU

Year: 933 Days

Day: 47.2 Hours

Environment

Temp: -78 °C

Axial Tilt: 16.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Terrestrial

Semi-Major Axis: 3.06 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.76

Radius: 1.25

Gravity: 1.13 G

Time & Orbit

Eccentricity (e): 0.097

Orbit Range: 2.76 AU - 3.36 AU

Year: 2017 Days

Day: 27.3 Hours

Environment

Temp: -113 °C

Axial Tilt: 33.4 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 3.66 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.16

Radius: 0.48

Gravity: 0.69 G

Time & Orbit

Eccentricity (e): 0.141

Orbit Range: 3.14 AU - 4.18 AU

Year: 2638 Days

Day: 31.7 Hours

Environment

Temp: -128 °C

Axial Tilt: 24.9 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 5 - Terrestrial

Semi-Major Axis: 3.67 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.25

Radius: 1.6

Gravity: 1.27 G

Time & Orbit

Eccentricity (e): 0.145

Orbit Range: 3.14 AU - 4.2 AU

Year: 2649 Days

Day: 41 Hours

Environment

Temp: -134 °C

Axial Tilt: 12 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 79,795,218 km

• M1: 124,465 km (0.108 R)

Planet 6 - Gas Giant

Semi-Major Axis: 5.07 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 305.1

Radius: 10.6

Gravity: 2.72 G

Time & Orbit

Eccentricity (e): 0.128

Orbit Range: 4.42 AU - 5.72 AU

Year: 4301 Days

Day: 10.2 Hours

Environment

Temp: -142 °C

Axial Tilt: 0.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (69)

Outer Limit: 79,795,218 km

• M1: 177,722 km (0.093 R)
• M2: 256,112 km (0.1 R)
• M3: 399,127 km (0.118 R)
• M4: 591,959 km (0.114 R)
• M5: 748,289 km (0.102 R)
• M6: 826,977 km (0.119 R)
• M7: 1,069,774 km (0.055 R)
• M8: 1,276,070 km (0.114 R)
• M9: 1,546,244 km (0.032 R)
• M10: 1,636,002 km (0.075 R)
• M11: 1,794,277 km (0.05 R)
• M12: 1,999,376 km (0.1 R)
• M13: 2,226,764 km (0.12 R)
• M14: 2,314,279 km (0.092 R)
• M15: 2,784,764 km (0.093 R)
• M16: 2,991,060 km (0.095 R)
• M17: 3,071,843 km (0.072 R)
• M18: 3,235,353 km (0.106 R)
• M19: 3,520,187 km (0.086 R)
• M20: 3,743,537 km (0.068 R)
• M21: 4,331,457 km (0.094 R)
• M22: 4,571,113 km (0.033 R)
• M23: 4,871,954 km (0.103 R)
• M24: 5,692,498 km (0.111 R)
• M25: 6,016,378 km (0.119 R)
• M26: 6,263,214 km (0.078 R)
• M27: 6,450,660 km (0.106 R)
• M28: 6,576,622 km (0.091 R)
• M29: 6,745,817 km (0.099 R)
• M30: 6,916,508 km (0.059 R)
• M31: 7,110,237 km (0.04 R)
• M32: 7,813,646 km (0.085 R)
• M33: 7,880,666 km (0.081 R)
• M34: 8,355,789 km (0.066 R)
• M35: 9,027,035 km (0.104 R)
• M36: 9,452,491 km (0.099 R)
• M37: 9,619,741 km (0.119 R)
• M38: 9,715,634 km (0.108 R)
• M39: 10,668,423 km (0.039 R)
• M40: 10,917,503 km (0.077 R)
• M41: 11,017,584 km (0.115 R)
• M42: 11,168,528 km (0.11 R)
• M43: 11,370,635 km (0.093 R)
• M44: 11,497,644 km (0.085 R)
• M45: 11,574,088 km (0.094 R)
• M46: 11,701,845 km (0.116 R)
• M47: 12,504,288 km (0.095 R)
• M48: 13,917,240 km (0.105 R)
• M49: 14,189,508 km (0.066 R)
• M50: 14,408,669 km (0.107 R)
• M51: 14,739,429 km (0.055 R)
• M52: 14,933,458 km (0.098 R)
• M53: 15,128,384 km (0.102 R)
• M54: 15,296,083 km (0.073 R)
• M55: 15,520,779 km (0.09 R)
• M56: 15,689,974 km (0.084 R)
• M57: 15,973,462 km (0.096 R)
• M58: 16,401,611 km (0.082 R)
• M59: 16,718,160 km (0.084 R)
• M60: 17,094,698 km (0.063 R)
• M61: 17,182,063 km (0.036 R)
• M62: 17,386,414 km (0.069 R)
• M63: 17,591,513 km (0.026 R)
• M64: 18,152,355 km (0.098 R)
• M65: 18,300,906 km (0.062 R)
• M66: 19,291,543 km (0.1 R)
• M67: 19,961,592 km (0.083 R)
• M68: 20,453,769 km (0.067 R)
• M69: 20,639,270 km (0.105 R)

Planet 7 - Gas Giant

Semi-Major Axis: 9.58 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 271.1

Radius: 8.1

Gravity: 4.13 G

Time & Orbit

Eccentricity (e): 0.092

Orbit Range: 8.7 AU - 10.46 AU

Year: 11171 Days

Day: 8 Hours

Environment

Temp: -182 °C

Axial Tilt: 43.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (89)

Outer Limit: 79,795,218 km

• M1: 138,528 km (0.06 R)
• M2: 277,803 km (0.074 R)
• M3: 391,797 km (0.05 R)
• M4: 642,224 km (0.1 R)
• M5: 712,535 km (0.116 R)
• M6: 815,608 km (0.097 R)
• M7: 1,104,032 km (0.079 R)
• M8: 1,155,195 km (0.104 R)
• M9: 1,574,368 km (0.119 R)
• M10: 2,340,010 km (0.055 R)
• M11: 2,496,489 km (0.093 R)
• M12: 2,610,333 km (0.058 R)
• M13: 2,702,785 km (0.059 R)
• M14: 2,914,615 km (0.087 R)
• M15: 2,986,422 km (0.053 R)
• M16: 3,131,831 km (0.061 R)
• M17: 3,230,267 km (0.11 R)
• M18: 3,429,980 km (0.056 R)
• M19: 3,737,104 km (0.073 R)
• M20: 3,867,703 km (0.037 R)
• M21: 4,160,466 km (0.106 R)
• M22: 4,488,086 km (0.104 R)
• M23: 4,683,161 km (0.104 R)
• M24: 4,995,073 km (0.11 R)
• M25: 5,168,158 km (0.107 R)
• M26: 5,226,351 km (0.093 R)
• M27: 5,789,587 km (0.119 R)
• M28: 6,032,385 km (0.109 R)
• M29: 6,247,805 km (0.074 R)
• M30: 7,037,233 km (0.094 R)
• M31: 7,427,385 km (0.063 R)
• M32: 7,493,058 km (0.102 R)
• M33: 8,228,631 km (0.045 R)
• M34: 8,778,104 km (0.107 R)
• M35: 8,987,092 km (0.085 R)
• M36: 9,948,258 km (0.032 R)
• M37: 10,312,529 km (0.073 R)
• M38: 11,016,686 km (0.096 R)
• M39: 11,355,675 km (0.114 R)
• M40: 11,621,660 km (0.056 R)
• M41: 12,432,032 km (0.062 R)
• M42: 13,220,562 km (0.1 R)
• M43: 14,639,348 km (0.108 R)
• M44: 15,262,124 km (0.081 R)
• M45: 15,513,598 km (0.107 R)
• M46: 15,978,249 km (0.118 R)
• M47: 16,404,753 km (0.111 R)
• M48: 16,490,472 km (0.042 R)
• M49: 16,619,276 km (0.074 R)
• M50: 17,008,081 km (0.096 R)
• M51: 17,926,462 km (0.096 R)
• M52: 18,458,582 km (0.084 R)
• M53: 18,637,202 km (0.098 R)
• M54: 19,176,203 km (0.054 R)
• M55: 19,902,800 km (0.094 R)
• M56: 20,269,464 km (0.072 R)
• M57: 20,963,000 km (0.109 R)
• M58: 21,711,438 km (0.107 R)
• M59: 21,994,328 km (0.066 R)
• M60: 23,571,987 km (0.109 R)
• M61: 23,960,044 km (0.068 R)
• M62: 25,037,747 km (0.103 R)
• M63: 25,185,849 km (0.117 R)
• M64: 25,632,249 km (0.105 R)
• M65: 25,981,111 km (0.087 R)
• M66: 26,081,192 km (0.091 R)
• M67: 26,683,772 km (0.074 R)
• M68: 27,088,135 km (0.103 R)
• M69: 27,290,990 km (0.045 R)
• M70: 27,698,345 km (0.105 R)
• M71: 27,749,358 km (0.115 R)
• M72: 27,851,533 km (0.114 R)
• M73: 28,467,577 km (0.055 R)
• M74: 29,087,960 km (0.08 R)
• M75: 29,660,471 km (0.102 R)
• M76: 30,079,345 km (0.074 R)
• M77: 30,236,871 km (0.057 R)
• M78: 30,447,355 km (0.099 R)
• M79: 30,658,288 km (0.112 R)
• M80: 31,081,800 km (0.029 R)
• M81: 31,347,336 km (0.029 R)
• M82: 31,453,850 km (0.103 R)
• M83: 32,848,850 km (0.118 R)
• M84: 33,065,169 km (0.105 R)
• M85: 34,154,241 km (0.107 R)
• M86: 34,813,369 km (0.082 R)
• M87: 35,199,781 km (0.068 R)
• M88: 37,096,831 km (0.106 R)
• M89: 37,153,080 km (0.075 R)

Planet 8 - Gas Giant

Semi-Major Axis: 11.62 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 729.3

Radius: 14.8

Gravity: 3.33 G

Time & Orbit

Eccentricity (e): 0.203

Orbit Range: 9.26 AU - 13.98 AU

Year: 14922 Days

Day: 13.1 Hours

Environment

Temp: -186 °C

Axial Tilt: 44.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 79,795,218 km

• M1: 206,595 km (0.104 R)
• M2: 515,215 km (0.098 R)
• M3: 752,328 km (0.067 R)
• M4: 1,144,274 km (0.08 R)
• M5: 2,079,710 km (0.079 R)
• M6: 3,034,443 km (0.105 R)
• M7: 3,594,238 km (0.117 R)
• M8: 4,533,414 km (0.106 R)
• M9: 4,889,606 km (0.035 R)
• M10: 5,051,023 km (0.053 R)
• M11: 5,671,854 km (0.036 R)
• M12: 6,099,255 km (0.071 R)
• M13: 6,404,883 km (0.04 R)
• M14: 7,213,759 km (0.098 R)
• M15: 7,865,258 km (0.109 R)
• M16: 9,575,909 km (0.115 R)
• M17: 9,727,751 km (0.077 R)
• M18: 10,395,257 km (0.068 R)
• M19: 11,024,615 km (0.079 R)
• M20: 12,430,536 km (0.03 R)
• M21: 14,760,523 km (0.119 R)
• M22: 15,765,521 km (0.104 R)
• M23: 16,306,617 km (0.112 R)
• M24: 17,407,059 km (0.118 R)
• M25: 17,530,776 km (0.1 R)
• M26: 17,966,255 km (0.077 R)
• M27: 18,091,319 km (0.07 R)
• M28: 18,279,513 km (0.074 R)
• M29: 18,531,436 km (0.088 R)
• M30: 18,847,836 km (0.067 R)
• M31: 19,614,824 km (0.105 R)
• M32: 20,196,760 km (0.074 R)
• M33: 20,391,985 km (0.119 R)
• M34: 20,522,584 km (0.11 R)
• M35: 21,510,229 km (0.078 R)
• M36: 21,643,072 km (0.034 R)
• M37: 22,513,432 km (0.071 R)
• M38: 23,258,879 km (0.072 R)
• M39: 24,426,789 km (0.117 R)
• M40: 26,676,741 km (0.069 R)
• M41: 28,553,147 km (0.089 R)
• M42: 28,845,611 km (0.052 R)
• M43: 30,025,489 km (0.091 R)
• M44: 30,174,040 km (0.044 R)
• M45: 32,051,942 km (0.115 R)
• M46: 33,504,388 km (0.118 R)
• M47: 34,744,255 km (0.076 R)
• M48: 35,998,932 km (0.108 R)
• M49: 36,315,033 km (0.118 R)
• M50: 36,711,317 km (0.083 R)
• M51: 37,508,225 km (0.086 R)
• M52: 38,795,216 km (0.053 R)
• M53: 40,260,377 km (0.099 R)
• M54: 41,577,886 km (0.084 R)
• M55: 41,992,422 km (0.089 R)
• M56: 43,076,856 km (0.062 R)
• M57: 43,244,556 km (0.082 R)
• M58: 43,748,850 km (0.108 R)
• M59: 44,255,089 km (0.051 R)
• M60: 44,508,957 km (0.107 R)
• M61: 44,763,273 km (0.055 R)
• M62: 46,557,101 km (0.086 R)
• M63: 48,461,482 km (0.051 R)
• M64: 48,810,494 km (0.083 R)
• M65: 50,303,032 km (0.118 R)
• M66: 51,188,053 km (0.102 R)
• M67: 51,810,530 km (0.1 R)
• M68: 52,793,986 km (0.116 R)
• M69: 53,242,929 km (0.047 R)
• M70: 54,416,375 km (0.109 R)
• M71: 55,233,628 km (0.093 R)
• M72: 56,146,624 km (0.09 R)
• M73: 56,421,435 km (0.092 R)
• M74: 57,617,620 km (0.118 R)
• M75: 59,194,531 km (0.096 R)
• M76: 59,754,326 km (0.1 R)
• M77: 60,222,418 km (0.097 R)
• M78: 60,409,864 km (0.082 R)
• M79: 60,691,557 km (0.061 R)
• M80: 61,444,782 km (0.1 R)
• M81: 62,295,695 km (0.087 R)
• M82: 63,150,796 km (0.117 R)
• M83: 63,818,452 km (0.119 R)

Planet 9 - Ice Giant

Semi-Major Axis: 13.02 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 17

Radius: 4.2

Gravity: 0.96 G

Time & Orbit

Eccentricity (e): 0.004

Orbit Range: 12.97 AU - 13.07 AU

Year: 17699 Days

Day: 21.2 Hours

Environment

Temp: -195 °C

Axial Tilt: 1.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (52)

Outer Limit: 79,795,218 km

• M1: 66,870 km (0.05 R)
• M2: 158,275 km (0.093 R)
• M3: 294,259 km (0.109 R)
• M4: 479,760 km (0.089 R)
• M5: 756,367 km (0.029 R)
• M6: 1,008,589 km (0.081 R)
• M7: 1,237,623 km (0.114 R)
• M8: 1,507,797 km (0.053 R)
• M9: 1,610,571 km (0.067 R)
• M10: 1,742,217 km (0.105 R)
• M11: 1,768,845 km (0.071 R)
• M12: 2,029,894 km (0.045 R)
• M13: 2,757,388 km (0.112 R)
• M14: 2,867,342 km (0.078 R)
• M15: 3,255,399 km (0.084 R)
• M16: 3,574,192 km (0.09 R)
• M17: 4,496,463 km (0.106 R)
• M18: 4,832,011 km (0.11 R)
• M19: 5,022,001 km (0.047 R)
• M20: 5,175,638 km (0.051 R)
• M21: 5,527,193 km (0.078 R)
• M22: 6,273,536 km (0.046 R)
• M23: 6,543,261 km (0.116 R)
• M24: 6,606,092 km (0.093 R)
• M25: 7,223,333 km (0.035 R)
• M26: 7,527,765 km (0.116 R)
• M27: 8,059,585 km (0.093 R)
• M28: 8,307,319 km (0.07 R)
• M29: 8,787,229 km (0.062 R)
• M30: 9,088,819 km (0.114 R)
• M31: 12,131,041 km (0.099 R)
• M32: 12,259,695 km (0.113 R)
• M33: 12,311,306 km (0.111 R)
• M34: 12,648,650 km (0.11 R)
• M35: 13,041,494 km (0.12 R)
• M36: 13,146,960 km (0.115 R)
• M37: 13,465,005 km (0.109 R)
• M38: 13,866,227 km (0.111 R)
• M39: 13,920,082 km (0.026 R)
• M40: 13,973,937 km (0.111 R)
• M41: 14,625,585 km (0.115 R)
• M42: 15,537,684 km (0.11 R)
• M43: 16,582,026 km (0.08 R)
• M44: 16,639,173 km (0.103 R)
• M45: 17,765,495 km (0.087 R)
• M46: 18,175,842 km (0.107 R)
• M47: 18,234,784 km (0.052 R)
• M48: 18,589,331 km (0.07 R)
• M49: 18,797,272 km (0.116 R)
• M50: 19,305,306 km (0.089 R)
• M51: 19,365,444 km (0.054 R)
• M52: 20,030,257 km (0.089 R)

Planet 10 - Ice Giant

Semi-Major Axis: 16.7 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 478.1

Radius: 5.4

Gravity: 16.4 G

Time & Orbit

Eccentricity (e): 0.127

Orbit Range: 14.58 AU - 18.82 AU

Year: 25710 Days

Day: 16.4 Hours

Environment

Temp: -202 °C

Axial Tilt: 12.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (95)

Outer Limit: 79,795,218 km

• M1: 74,350 km (0.034 R)
• M2: 401,371 km (0.067 R)
• M3: 634,594 km (0.039 R)
• M4: 828,174 km (0.103 R)
• M5: 931,995 km (0.087 R)
• M6: 1,298,061 km (0.111 R)
• M7: 1,480,869 km (0.101 R)
• M8: 1,607,429 km (0.063 R)
• M9: 1,837,511 km (0.091 R)
• M10: 1,939,237 km (0.119 R)
• M11: 2,219,883 km (0.047 R)
• M12: 2,364,843 km (0.107 R)
• M13: 2,857,619 km (0.104 R)
• M14: 3,136,020 km (0.08 R)
• M15: 3,217,102 km (0.085 R)
• M16: 4,154,333 km (0.076 R)
• M17: 5,754,432 km (0.116 R)
• M18: 6,308,692 km (0.05 R)
• M19: 7,198,201 km (0.106 R)
• M20: 7,251,757 km (0.077 R)
• M21: 7,305,462 km (0.092 R)
• M22: 7,739,745 km (0.083 R)
• M23: 10,759,228 km (0.053 R)
• M24: 11,377,217 km (0.111 R)
• M25: 12,711,929 km (0.083 R)
• M26: 14,297,069 km (0.06 R)
• M27: 14,839,062 km (0.046 R)
• M28: 15,595,279 km (0.111 R)
• M29: 16,223,440 km (0.057 R)
• M30: 16,575,893 km (0.115 R)
• M31: 17,576,254 km (0.105 R)
• M32: 17,865,576 km (0.112 R)
• M33: 18,964,821 km (0.058 R)
• M34: 19,038,872 km (0.086 R)
• M35: 20,161,305 km (0.091 R)
• M36: 21,305,130 km (0.112 R)
• M37: 21,768,435 km (0.111 R)
• M38: 22,235,180 km (0.086 R)
• M39: 23,020,270 km (0.114 R)
• M40: 23,416,256 km (0.116 R)
• M41: 23,654,864 km (0.113 R)
• M42: 25,593,054 km (0.1 R)
• M43: 26,498,271 km (0.081 R)
• M44: 27,246,559 km (0.028 R)
• M45: 28,002,029 km (0.095 R)
• M46: 28,339,821 km (0.088 R)
• M47: 28,594,287 km (0.066 R)
• M48: 29,276,154 km (0.108 R)
• M49: 29,877,238 km (0.032 R)
• M50: 29,963,406 km (0.116 R)
• M51: 31,178,739 km (0.105 R)
• M52: 32,321,817 km (0.118 R)
• M53: 32,853,936 km (0.112 R)
• M54: 34,648,662 km (0.08 R)
• M55: 34,739,169 km (0.071 R)
• M56: 35,011,287 km (0.079 R)
• M57: 35,284,154 km (0.073 R)
• M58: 36,015,388 km (0.103 R)
• M59: 37,028,764 km (0.093 R)
• M60: 37,214,116 km (0.081 R)
• M61: 40,601,311 km (0.104 R)
• M62: 41,463,294 km (0.058 R)
• M63: 42,234,620 km (0.085 R)
• M64: 42,331,410 km (0.107 R)
• M65: 45,367,050 km (0.093 R)
• M66: 46,361,128 km (0.034 R)
• M67: 46,660,773 km (0.109 R)
• M68: 47,664,275 km (0.101 R)
• M69: 48,067,591 km (0.106 R)
• M70: 48,472,104 km (0.069 R)
• M71: 49,386,296 km (0.045 R)
• M72: 49,488,322 km (0.038 R)
• M73: 50,408,798 km (0.112 R)
• M74: 50,511,422 km (0.088 R)
• M75: 51,541,702 km (0.092 R)
• M76: 51,852,118 km (0.062 R)
• M77: 51,955,640 km (0.028 R)
• M78: 52,370,774 km (0.092 R)
• M79: 53,099,914 km (0.066 R)
• M80: 56,155,899 km (0.101 R)
• M81: 58,296,645 km (0.097 R)
• M82: 58,512,066 km (0.072 R)
• M83: 59,268,582 km (0.066 R)
• M84: 59,702,266 km (0.075 R)
• M85: 61,337,969 km (0.071 R)
• M86: 62,106,454 km (0.109 R)
• M87: 64,430,756 km (0.089 R)
• M88: 68,253,729 km (0.106 R)
• M89: 69,163,883 km (0.059 R)
• M90: 71,918,279 km (0.107 R)
• M91: 72,728,501 km (0.112 R)
• M92: 73,774,489 km (0.097 R)
• M93: 73,891,026 km (0.081 R)
• M94: 74,825,414 km (0.05 R)
• M95: 75,294,104 km (0.12 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: 177 - 15,941 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit