🌌 Stone's Star System Generator

Planet 1 - Gas Giant

Semi-Major Axis: 1.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 512.5

Radius: 9.9

Gravity: 5.23 G

Time & Orbit

Eccentricity (e): 0.126

Orbit Range: 1.16 AU - 1.5 AU

Year: 1040 Days

Day: 11 Hours

Environment

Temp: -186 °C

Axial Tilt: 15.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (60)

Outer Limit: 51,957,658 km

• M1: 127,607 km (0.078 R)
• M2: 219,909 km (0.104 R)
• M3: 299,046 km (0.103 R)
• M4: 428,149 km (0.071 R)
• M5: 508,334 km (0.106 R)
• M6: 573,708 km (0.08 R)
• M7: 675,135 km (0.073 R)
• M8: 824,733 km (0.084 R)
• M9: 891,454 km (0.108 R)
• M10: 1,063,790 km (0.117 R)
• M11: 1,137,243 km (0.092 R)
• M12: 1,226,403 km (0.075 R)
• M13: 1,296,714 km (0.106 R)
• M14: 1,412,054 km (0.087 R)
• M15: 1,508,395 km (0.048 R)
• M16: 1,700,180 km (0.109 R)
• M17: 1,779,167 km (0.116 R)
• M18: 1,843,195 km (0.091 R)
• M19: 2,031,988 km (0.117 R)
• M20: 2,132,966 km (0.057 R)
• M21: 2,235,740 km (0.091 R)
• M22: 2,563,210 km (0.065 R)
• M23: 2,728,067 km (0.038 R)
• M24: 2,802,417 km (0.087 R)
• M25: 2,868,090 km (0.116 R)
• M26: 2,991,509 km (0.052 R)
• M27: 3,058,678 km (0.094 R)
• M28: 3,145,894 km (0.042 R)
• M29: 3,392,281 km (0.089 R)
• M30: 3,696,563 km (0.109 R)
• M31: 3,799,936 km (0.109 R)
• M32: 3,988,429 km (0.055 R)
• M33: 4,342,078 km (0.055 R)
• M34: 4,506,187 km (0.099 R)
• M35: 4,639,030 km (0.12 R)
• M36: 4,705,900 km (0.114 R)
• M37: 4,773,219 km (0.108 R)
• M38: 4,886,016 km (0.076 R)
• M39: 5,137,191 km (0.089 R)
• M40: 5,264,499 km (0.028 R)
• M41: 5,334,211 km (0.11 R)
• M42: 5,498,470 km (0.034 R)
• M43: 5,735,882 km (0.036 R)
• M44: 5,819,806 km (0.107 R)
• M45: 5,940,531 km (0.087 R)
• M46: 6,013,236 km (0.114 R)
• M47: 6,147,425 km (0.116 R)
• M48: 6,656,357 km (0.065 R)
• M49: 6,769,902 km (0.073 R)
• M50: 6,947,774 km (0.092 R)
• M51: 7,088,695 km (0.119 R)
• M52: 7,153,022 km (0.092 R)
• M53: 7,217,648 km (0.107 R)
• M54: 7,887,249 km (0.054 R)
• M55: 8,020,839 km (0.1 R)
• M56: 8,222,647 km (0.094 R)
• M57: 8,358,183 km (0.075 R)
• M58: 8,439,863 km (0.118 R)
• M59: 9,313,515 km (0.119 R)
• M60: 9,497,370 km (0.111 R)

Planet 2 - Gas Giant

Semi-Major Axis: 1.7 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 818.1

Radius: 13.9

Gravity: 4.23 G

Time & Orbit

Eccentricity (e): 0.173

Orbit Range: 1.41 AU - 1.99 AU

Year: 1503 Days

Day: 5.9 Hours

Environment

Temp: -193 °C

Axial Tilt: 18.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (59)

Outer Limit: 51,957,658 km

• M1: 175,179 km (0.108 R)
• M2: 312,959 km (0.059 R)
• M3: 402,867 km (0.066 R)
• M4: 615,296 km (0.113 R)
• M5: 770,728 km (0.096 R)
• M6: 877,541 km (0.114 R)
• M7: 989,889 km (0.072 R)
• M8: 1,082,041 km (0.111 R)
• M9: 1,177,335 km (0.102 R)
• M10: 1,443,470 km (0.097 R)
• M11: 1,608,925 km (0.071 R)
• M12: 1,885,083 km (0.107 R)
• M13: 2,012,839 km (0.085 R)
• M14: 2,110,826 km (0.093 R)
• M15: 2,277,628 km (0.057 R)
• M16: 2,368,433 km (0.11 R)
• M17: 2,495,442 km (0.091 R)
• M18: 2,780,576 km (0.062 R)
• M19: 2,964,431 km (0.106 R)
• M20: 3,064,064 km (0.068 R)
• M21: 3,369,991 km (0.088 R)
• M22: 3,929,637 km (0.094 R)
• M23: 4,164,506 km (0.082 R)
• M24: 4,504,093 km (0.102 R)
• M25: 4,604,922 km (0.044 R)
• M26: 4,794,013 km (0.082 R)
• M27: 5,423,072 km (0.1 R)
• M28: 5,607,527 km (0.072 R)
• M29: 6,334,423 km (0.083 R)
• M30: 6,627,036 km (0.085 R)
• M31: 6,957,498 km (0.076 R)
• M32: 7,276,440 km (0.082 R)
• M33: 7,395,072 km (0.118 R)
• M34: 7,565,763 km (0.094 R)
• M35: 7,668,836 km (0.114 R)
• M36: 8,015,903 km (0.061 R)
• M37: 8,492,522 km (0.034 R)
• M38: 8,635,687 km (0.036 R)
• M39: 8,743,397 km (0.101 R)
• M40: 8,924,111 km (0.111 R)
• M41: 9,106,022 km (0.1 R)
• M42: 9,381,282 km (0.112 R)
• M43: 9,492,134 km (0.115 R)
• M44: 9,864,932 km (0.097 R)
• M45: 10,337,662 km (0.096 R)
• M46: 10,644,038 km (0.078 R)
• M47: 11,011,899 km (0.117 R)
• M48: 11,502,281 km (0.108 R)
• M49: 11,780,084 km (0.118 R)
• M50: 11,999,993 km (0.075 R)
• M51: 12,140,466 km (0.11 R)
• M52: 12,484,242 km (0.089 R)
• M53: 12,810,814 km (0.108 R)
• M54: 12,913,438 km (0.088 R)
• M55: 13,016,212 km (0.065 R)
• M56: 13,202,162 km (0.102 R)
• M57: 13,513,924 km (0.106 R)
• M58: 14,017,919 km (0.12 R)
• M59: 14,208,357 km (0.075 R)

Planet 3 - Gas Giant

Semi-Major Axis: 2.33 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 260.4

Radius: 8.9

Gravity: 3.29 G

Time & Orbit

Eccentricity (e): 0.235

Orbit Range: 1.78 AU - 2.88 AU

Year: 2412 Days

Day: 9.3 Hours

Environment

Temp: -200 °C

Axial Tilt: 31.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (67)

Outer Limit: 51,957,658 km

• M1: 112,946 km (0.085 R)
• M2: 209,587 km (0.11 R)
• M3: 429,795 km (0.109 R)
• M4: 539,001 km (0.104 R)
• M5: 651,648 km (0.088 R)
• M6: 772,673 km (0.071 R)
• M7: 972,835 km (0.119 R)
• M8: 1,054,366 km (0.108 R)
• M9: 1,121,386 km (0.075 R)
• M10: 1,215,931 km (0.09 R)
• M11: 1,394,851 km (0.118 R)
• M12: 1,699,432 km (0.118 R)
• M13: 1,768,845 km (0.093 R)
• M14: 1,859,502 km (0.104 R)
• M15: 1,972,448 km (0.097 R)
• M16: 2,216,292 km (0.054 R)
• M17: 2,380,701 km (0.087 R)
• M18: 2,436,351 km (0.114 R)
• M19: 2,548,998 km (0.12 R)
• M20: 2,709,816 km (0.065 R)
• M21: 3,089,794 km (0.106 R)
• M22: 3,175,215 km (0.066 R)
• M23: 3,236,700 km (0.053 R)
• M24: 3,486,678 km (0.084 R)
• M25: 3,704,193 km (0.078 R)
• M26: 3,899,867 km (0.044 R)
• M27: 4,233,470 km (0.117 R)
• M28: 4,301,238 km (0.108 R)
• M29: 4,507,085 km (0.084 R)
• M30: 4,604,174 km (0.102 R)
• M31: 4,659,974 km (0.119 R)
• M32: 4,716,073 km (0.086 R)
• M33: 4,772,322 km (0.092 R)
• M34: 5,172,496 km (0.11 R)
• M35: 5,259,712 km (0.101 R)
• M36: 5,509,390 km (0.116 R)
• M37: 5,673,050 km (0.081 R)
• M38: 5,868,575 km (0.115 R)
• M39: 6,468,462 km (0.084 R)
• M40: 6,672,813 km (0.061 R)
• M41: 7,055,634 km (0.116 R)
• M42: 7,380,112 km (0.037 R)
• M43: 7,462,091 km (0.082 R)
• M44: 7,759,342 km (0.043 R)
• M45: 7,892,784 km (0.09 R)
• M46: 7,959,804 km (0.113 R)
• M47: 8,451,083 km (0.042 R)
• M48: 8,865,170 km (0.108 R)
• M49: 9,004,745 km (0.111 R)
• M50: 9,197,726 km (0.061 R)
• M51: 9,445,460 km (0.072 R)
• M52: 9,893,206 km (0.072 R)
• M53: 10,238,029 km (0.077 R)
• M54: 10,568,491 km (0.082 R)
• M55: 10,642,393 km (0.038 R)
• M56: 10,790,794 km (0.065 R)
• M57: 11,221,037 km (0.085 R)
• M58: 11,277,585 km (0.063 R)
• M59: 11,752,409 km (0.106 R)
• M60: 11,944,193 km (0.099 R)
• M61: 12,098,429 km (0.082 R)
• M62: 12,175,771 km (0.037 R)
• M63: 12,253,262 km (0.089 R)
• M64: 12,702,206 km (0.08 R)
• M65: 13,196,178 km (0.071 R)
• M66: 13,255,867 km (0.11 R)
• M67: 13,395,442 km (0.12 R)

Planet 4 - Gas Giant

Semi-Major Axis: 3.41 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 620.8

Radius: 11.4

Gravity: 4.78 G

Time & Orbit

Eccentricity (e): 0.115

Orbit Range: 3.02 AU - 3.8 AU

Year: 4271 Days

Day: 9.5 Hours

Environment

Temp: -225 °C

Axial Tilt: 42.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 51,957,658 km

• M1: 146,008 km (0.097 R)
• M2: 245,191 km (0.12 R)
• M3: 320,439 km (0.051 R)
• M4: 470,037 km (0.098 R)
• M5: 647,310 km (0.076 R)
• M6: 813,214 km (0.119 R)
• M7: 907,909 km (0.08 R)
• M8: 1,109,418 km (0.097 R)
• M9: 1,298,061 km (0.084 R)
• M10: 1,753,885 km (0.048 R)
• M11: 2,090,181 km (0.085 R)
• M12: 2,240,677 km (0.089 R)
• M13: 2,464,475 km (0.037 R)
• M14: 2,641,749 km (0.088 R)
• M15: 3,511,062 km (0.081 R)
• M16: 3,935,621 km (0.118 R)
• M17: 4,441,112 km (0.094 R)
• M18: 4,636,038 km (0.107 R)
• M19: 4,767,535 km (0.045 R)
• M20: 4,944,958 km (0.086 R)
• M21: 5,101,886 km (0.076 R)
• M22: 5,374,902 km (0.11 R)
• M23: 5,676,042 km (0.088 R)
• M24: 5,982,868 km (0.086 R)
• M25: 6,465,470 km (0.055 R)
• M26: 6,637,358 km (0.071 R)
• M27: 6,736,243 km (0.093 R)
• M28: 6,885,541 km (0.064 R)
• M29: 7,340,169 km (0.111 R)
• M30: 7,570,999 km (0.096 R)
• M31: 7,856,581 km (0.116 R)
• M32: 8,761,648 km (0.095 R)
• M33: 9,006,689 km (0.108 R)
• M34: 9,143,871 km (0.097 R)
• M35: 9,503,803 km (0.029 R)
• M36: 9,615,403 km (0.035 R)
• M37: 9,981,469 km (0.063 R)
• M38: 10,151,861 km (0.105 R)
• M39: 10,323,300 km (0.044 R)
• M40: 10,409,319 km (0.104 R)
• M41: 11,879,118 km (0.073 R)
• M42: 11,969,326 km (0.1 R)
• M43: 12,211,076 km (0.113 R)
• M44: 12,332,549 km (0.075 R)
• M45: 13,538,308 km (0.066 R)
• M46: 13,632,555 km (0.098 R)
• M47: 13,790,231 km (0.09 R)
• M48: 15,432,816 km (0.043 R)
• M49: 15,630,135 km (0.069 R)
• M50: 16,327,261 km (0.117 R)
• M51: 16,696,618 km (0.106 R)
• M52: 16,831,556 km (0.091 R)
• M53: 17,000,751 km (0.107 R)
• M54: 17,238,611 km (0.115 R)
• M55: 17,511,777 km (0.084 R)
• M56: 17,717,624 km (0.069 R)
• M57: 18,097,004 km (0.054 R)
• M58: 18,374,658 km (0.08 R)
• M59: 18,653,807 km (0.089 R)
• M60: 19,110,230 km (0.111 R)
• M61: 19,855,527 km (0.118 R)
• M62: 20,465,737 km (0.077 R)
• M63: 20,537,843 km (0.069 R)
• M64: 20,610,099 km (0.057 R)
• M65: 20,972,873 km (0.085 R)
• M66: 21,594,303 km (0.099 R)
• M67: 22,481,867 km (0.082 R)
• M68: 22,780,465 km (0.101 R)
• M69: 23,381,399 km (0.042 R)
• M70: 24,292,749 km (0.054 R)
• M71: 24,906,699 km (0.106 R)
• M72: 25,022,488 km (0.087 R)
• M73: 25,448,243 km (0.113 R)
• M74: 25,681,466 km (0.077 R)

Asteroid Belt

Center: 4.55 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 5 - Ice Giant

Semi-Major Axis: 5.68 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 290.3

Radius: 6.1

Gravity: 7.8 G

Time & Orbit

Eccentricity (e): 0.173

Orbit Range: 4.7 AU - 6.66 AU

Year: 9182 Days

Day: 21.5 Hours

Environment

Temp: -225 °C

Axial Tilt: 11.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 51,957,658 km

• M1: 120,426 km (0.1 R)
• M2: 478,264 km (0.038 R)
• M3: 931,696 km (0.095 R)
• M4: 1,165,218 km (0.029 R)
• M5: 1,416,542 km (0.068 R)
• M6: 1,684,921 km (0.11 R)
• M7: 2,309,193 km (0.112 R)
• M8: 2,645,938 km (0.077 R)
• M9: 2,886,341 km (0.108 R)
• M10: 2,930,921 km (0.063 R)
• M11: 3,179,703 km (0.03 R)
• M12: 4,016,104 km (0.032 R)
• M13: 4,115,886 km (0.098 R)
• M14: 4,836,948 km (0.077 R)
• M15: 4,889,906 km (0.095 R)
• M16: 5,103,831 km (0.114 R)
• M17: 6,276,528 km (0.065 R)
• M18: 6,363,445 km (0.113 R)
• M19: 6,567,646 km (0.082 R)
• M20: 6,922,791 km (0.081 R)
• M21: 7,012,550 km (0.118 R)
• M22: 7,436,510 km (0.119 R)
• M23: 7,620,815 km (0.115 R)
• M24: 8,277,549 km (0.068 R)
• M25: 9,445,161 km (0.082 R)
• M26: 9,912,953 km (0.067 R)
• M27: 10,663,336 km (0.078 R)
• M28: 11,680,303 km (0.079 R)
• M29: 11,930,281 km (0.094 R)
• M30: 12,182,203 km (0.078 R)
• M31: 12,801,090 km (0.116 R)
• M32: 13,058,847 km (0.106 R)
• M33: 13,392,899 km (0.119 R)
• M34: 13,616,997 km (0.114 R)
• M35: 13,729,644 km (0.102 R)
• M36: 13,880,289 km (0.1 R)
• M37: 14,488,105 km (0.082 R)
• M38: 14,988,360 km (0.107 R)
• M39: 15,143,344 km (0.105 R)
• M40: 15,182,239 km (0.112 R)
• M41: 15,221,135 km (0.067 R)
• M42: 15,572,540 km (0.08 R)
• M43: 16,642,913 km (0.066 R)
• M44: 17,328,969 km (0.115 R)
• M45: 17,410,350 km (0.107 R)
• M46: 17,859,891 km (0.111 R)
• M47: 17,900,881 km (0.083 R)
• M48: 18,106,578 km (0.045 R)
• M49: 18,271,734 km (0.114 R)
• M50: 19,105,144 km (0.119 R)
• M51: 21,111,700 km (0.095 R)
• M52: 21,503,497 km (0.047 R)
• M53: 21,766,041 km (0.103 R)
• M54: 21,897,837 km (0.089 R)
• M55: 22,117,896 km (0.108 R)
• M56: 22,471,395 km (0.115 R)
• M57: 22,515,826 km (0.108 R)
• M58: 22,871,420 km (0.084 R)
• M59: 23,139,499 km (0.078 R)
• M60: 23,723,679 km (0.11 R)
• M61: 25,182,558 km (0.095 R)
• M62: 28,425,241 km (0.114 R)
• M63: 28,521,133 km (0.115 R)
• M64: 29,729,435 km (0.099 R)
• M65: 29,924,361 km (0.111 R)
• M66: 30,609,819 km (0.117 R)
• M67: 30,658,887 km (0.085 R)
• M68: 30,757,322 km (0.095 R)
• M69: 30,905,125 km (0.11 R)
• M70: 30,954,343 km (0.057 R)
• M71: 31,003,710 km (0.099 R)
• M72: 31,300,362 km (0.086 R)
• M73: 31,349,879 km (0.101 R)
• M74: 31,796,728 km (0.1 R)
• M75: 32,445,983 km (0.045 R)
• M76: 32,747,123 km (0.102 R)
• M77: 32,847,653 km (0.115 R)
• M78: 33,503,939 km (0.08 R)
• M79: 33,655,931 km (0.055 R)
• M80: 33,706,644 km (0.104 R)

Planet 6 - Ice Giant

Semi-Major Axis: 6.69 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 633.4

Radius: 4.7

Gravity: 28.67 G

Time & Orbit

Eccentricity (e): 0.047

Orbit Range: 6.38 AU - 7 AU

Year: 11736 Days

Day: 22.4 Hours

Environment

Temp: -237 °C

Axial Tilt: 123.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (93)

Outer Limit: 51,957,658 km

• M1: 163,510 km (0.099 R)
• M2: 301,589 km (0.086 R)
• M3: 638,633 km (0.102 R)
• M4: 746,194 km (0.116 R)
• M5: 1,506,750 km (0.103 R)
• M6: 1,977,833 km (0.085 R)
• M7: 2,056,073 km (0.06 R)
• M8: 3,013,350 km (0.09 R)
• M9: 3,103,707 km (0.105 R)
• M10: 3,194,962 km (0.085 R)
• M11: 3,225,480 km (0.072 R)
• M12: 3,664,101 km (0.096 R)
• M13: 3,955,966 km (0.1 R)
• M14: 4,770,227 km (0.112 R)
• M15: 5,745,905 km (0.069 R)
• M16: 6,468,163 km (0.087 R)
• M17: 6,506,909 km (0.066 R)
• M18: 6,820,167 km (0.108 R)
• M19: 6,978,741 km (0.103 R)
• M20: 7,299,329 km (0.116 R)
• M21: 7,502,184 km (0.104 R)
• M22: 7,583,714 km (0.081 R)
• M23: 7,747,973 km (0.109 R)
• M24: 7,830,551 km (0.092 R)
• M25: 8,247,480 km (0.115 R)
• M26: 8,331,853 km (0.094 R)
• M27: 8,800,394 km (0.052 R)
• M28: 8,973,030 km (0.077 R)
• M29: 9,585,633 km (0.07 R)
• M30: 9,896,946 km (0.062 R)
• M31: 10,031,435 km (0.03 R)
• M32: 10,850,932 km (0.073 R)
• M33: 11,644,399 km (0.104 R)
• M34: 11,928,934 km (0.107 R)
• M35: 12,650,146 km (0.111 R)
• M36: 14,437,990 km (0.102 R)
• M37: 14,692,456 km (0.088 R)
• M38: 15,464,829 km (0.066 R)
• M39: 16,568,114 km (0.062 R)
• M40: 16,621,371 km (0.069 R)
• M41: 17,479,763 km (0.034 R)
• M42: 18,133,057 km (0.116 R)
• M43: 18,517,823 km (0.083 R)
• M44: 19,016,433 km (0.091 R)
• M45: 20,253,757 km (0.049 R)
• M46: 20,481,594 km (0.083 R)
• M47: 20,939,663 km (0.111 R)
• M48: 20,997,108 km (0.111 R)
• M49: 21,169,894 km (0.06 R)
• M50: 21,285,383 km (0.109 R)
• M51: 22,275,273 km (0.082 R)
• M52: 22,451,648 km (0.097 R)
• M53: 23,459,040 km (0.06 R)
• M54: 23,578,569 km (0.115 R)
• M55: 23,638,408 km (0.106 R)
• M56: 24,239,343 km (0.11 R)
• M57: 24,299,781 km (0.084 R)
• M58: 24,420,656 km (0.052 R)
• M59: 26,196,083 km (0.06 R)
• M60: 26,444,266 km (0.05 R)
• M61: 29,160,515 km (0.094 R)
• M62: 29,740,206 km (0.101 R)
• M63: 29,804,833 km (0.105 R)
• M64: 30,128,712 km (0.107 R)
• M65: 30,649,462 km (0.095 R)
• M66: 31,567,843 km (0.098 R)
• M67: 31,898,006 km (0.109 R)
• M68: 32,030,400 km (0.119 R)
• M69: 32,295,637 km (0.106 R)
• M70: 32,428,630 km (0.044 R)
• M71: 32,561,772 km (0.06 R)
• M72: 33,029,115 km (0.05 R)
• M73: 33,297,195 km (0.067 R)
• M74: 33,835,448 km (0.034 R)
• M75: 34,580,296 km (0.062 R)
• M76: 35,125,281 km (0.112 R)
• M77: 36,362,006 km (0.098 R)
• M78: 36,777,440 km (0.07 R)
• M79: 38,103,326 km (0.079 R)
• M80: 39,161,132 km (0.106 R)
• M81: 39,515,829 km (0.101 R)
• M82: 39,729,155 km (0.1 R)
• M83: 42,028,624 km (0.059 R)
• M84: 43,048,134 km (0.1 R)
• M85: 44,666,483 km (0.044 R)
• M86: 45,037,187 km (0.117 R)
• M87: 45,483,138 km (0.036 R)
• M88: 47,282,053 km (0.107 R)
• M89: 47,811,031 km (0.103 R)
• M90: 48,266,107 km (0.114 R)
• M91: 49,946,839 km (0.118 R)
• M92: 50,023,583 km (0.068 R)
• M93: 50,254,413 km (0.063 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: 384 - 19,676 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit