🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.69 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.38

Radius: 0.68

Gravity: 0.82 G

Time & Orbit

Eccentricity (e): 0.04

Orbit Range: 0.66 AU - 0.72 AU

Year: 217 Days

Day: 25.7 Hours

Environment

Temp: 149 °C

Axial Tilt: 35.2 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (2)

Outer Limit: 53,379,807 km

• M1: 27,526 km (0.057 R)
• M2: 143,614 km (0.073 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1.16 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 4.73

Radius: 1.86

Gravity: 1.37 G

Time & Orbit

Eccentricity (e): 0.028

Orbit Range: 1.13 AU - 1.19 AU

Year: 473 Days

Day: 25.4 Hours

Environment

Temp: 7 °C

Axial Tilt: 42.3 °

Atmosphere: N₂, O₂

Biome: Oceanic/Continental

Planet 3 - Terrestrial

Semi-Major Axis: 1.27 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 1.41

Radius: 1.15

Gravity: 1.07 G

Time & Orbit

Eccentricity (e): 0.115

Orbit Range: 1.12 AU - 1.42 AU

Year: 542 Days

Day: 24 Hours

Environment

Temp: -26 °C

Axial Tilt: 11.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 3.84 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.63

Radius: 1.47

Gravity: 1.22 G

Time & Orbit

Eccentricity (e): 0.164

Orbit Range: 3.21 AU - 4.47 AU

Year: 2850 Days

Day: 22.4 Hours

Environment

Temp: -133 °C

Axial Tilt: 26.5 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 53,379,807 km

• M1: 219,310 km (0.027 R)

Planet 5 - Gas Giant

Semi-Major Axis: 6.5 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 314.7

Radius: 8.2

Gravity: 4.68 G

Time & Orbit

Eccentricity (e): 0.022

Orbit Range: 6.36 AU - 6.64 AU

Year: 6277 Days

Day: 15 Hours

Environment

Temp: -157 °C

Axial Tilt: 39.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (90)

Outer Limit: 53,379,807 km

• M1: 128,953 km (0.115 R)
• M2: 242,349 km (0.118 R)
• M3: 403,914 km (0.102 R)
• M4: 613,052 km (0.117 R)
• M5: 783,145 km (0.11 R)
• M6: 1,100,891 km (0.104 R)
• M7: 1,183,020 km (0.07 R)
• M8: 1,766,302 km (0.116 R)
• M9: 2,062,506 km (0.112 R)
• M10: 2,908,332 km (0.11 R)
• M11: 3,100,865 km (0.047 R)
• M12: 3,238,196 km (0.056 R)
• M13: 3,397,667 km (0.052 R)
• M14: 3,458,104 km (0.113 R)
• M15: 3,724,389 km (0.104 R)
• M16: 3,954,919 km (0.085 R)
• M17: 4,039,890 km (0.116 R)
• M18: 4,320,387 km (0.069 R)
• M19: 4,451,883 km (0.073 R)
• M20: 4,877,339 km (0.086 R)
• M21: 4,968,594 km (0.082 R)
• M22: 5,152,899 km (0.038 R)
• M23: 5,743,062 km (0.119 R)
• M24: 6,009,496 km (0.089 R)
• M25: 6,181,234 km (0.101 R)
• M26: 6,529,498 km (0.064 R)
• M27: 6,630,178 km (0.109 R)
• M28: 6,706,024 km (0.097 R)
• M29: 6,782,169 km (0.041 R)
• M30: 7,427,983 km (0.042 R)
• M31: 7,691,724 km (0.115 R)
• M32: 7,771,609 km (0.106 R)
• M33: 8,066,317 km (0.098 R)
• M34: 8,310,311 km (0.11 R)
• M35: 8,446,894 km (0.083 R)
• M36: 8,556,699 km (0.06 R)
• M37: 8,694,628 km (0.111 R)
• M38: 9,310,223 km (0.098 R)
• M39: 9,480,466 km (0.115 R)
• M40: 9,766,796 km (0.114 R)
• M41: 9,881,987 km (0.083 R)
• M42: 10,026,797 km (0.101 R)
• M43: 10,172,206 km (0.117 R)
• M44: 10,999,632 km (0.113 R)
• M45: 11,119,610 km (0.118 R)
• M46: 11,240,036 km (0.073 R)
• M47: 11,542,972 km (0.109 R)
• M48: 12,033,204 km (0.086 R)
• M49: 12,467,786 km (0.057 R)
• M50: 12,561,584 km (0.071 R)
• M51: 12,687,096 km (0.105 R)
• M52: 13,193,036 km (0.111 R)
• M53: 13,480,414 km (0.112 R)
• M54: 13,705,409 km (0.06 R)
• M55: 13,964,213 km (0.091 R)
• M56: 14,094,064 km (0.097 R)
• M57: 14,882,295 km (0.074 R)
• M58: 16,227,479 km (0.12 R)
• M59: 16,983,846 km (0.079 R)
• M60: 17,053,260 km (0.089 R)
• M61: 17,157,380 km (0.077 R)
• M62: 17,261,799 km (0.095 R)
• M63: 17,331,512 km (0.094 R)
• M64: 17,786,888 km (0.098 R)
• M65: 18,175,244 km (0.075 R)
• M66: 18,566,442 km (0.119 R)
• M67: 18,709,458 km (0.115 R)
• M68: 19,176,502 km (0.097 R)
• M69: 19,502,177 km (0.075 R)
• M70: 19,683,938 km (0.036 R)
• M71: 19,756,792 km (0.102 R)
• M72: 20,048,957 km (0.116 R)
• M73: 20,232,364 km (0.091 R)
• M74: 21,681,818 km (0.066 R)
• M75: 21,870,162 km (0.115 R)
• M76: 22,134,651 km (0.093 R)
• M77: 22,210,347 km (0.117 R)
• M78: 22,476,182 km (0.081 R)
• M79: 22,819,510 km (0.096 R)
• M80: 22,896,104 km (0.098 R)
• M81: 23,126,185 km (0.095 R)
• M82: 23,203,079 km (0.092 R)
• M83: 23,357,015 km (0.108 R)
• M84: 24,015,395 km (0.117 R)
• M85: 24,327,307 km (0.086 R)
• M86: 24,679,759 km (0.115 R)
• M87: 24,758,298 km (0.107 R)
• M88: 24,836,986 km (0.066 R)
• M89: 26,507,696 km (0.079 R)
• M90: 27,072,727 km (0.11 R)

Planet 6 - Gas Giant

Semi-Major Axis: 7.6 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 590.7

Radius: 10.2

Gravity: 5.68 G

Time & Orbit

Eccentricity (e): 0.227

Orbit Range: 5.87 AU - 9.33 AU

Year: 7935 Days

Day: 14.9 Hours

Environment

Temp: -166 °C

Axial Tilt: 106.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (71)

Outer Limit: 53,379,807 km

• M1: 130,300 km (0.111 R)
• M2: 254,017 km (0.104 R)
• M3: 602,431 km (0.117 R)
• M4: 714,031 km (0.053 R)
• M5: 1,359,396 km (0.12 R)
• M6: 1,828,834 km (0.099 R)
• M7: 1,932,804 km (0.098 R)
• M8: 2,715,650 km (0.112 R)
• M9: 3,355,031 km (0.111 R)
• M10: 3,534,998 km (0.119 R)
• M11: 3,877,876 km (0.113 R)
• M12: 4,567,373 km (0.057 R)
• M13: 5,116,546 km (0.108 R)
• M14: 5,205,258 km (0.086 R)
• M15: 5,444,166 km (0.08 R)
• M16: 5,686,813 km (0.079 R)
• M17: 5,778,667 km (0.119 R)
• M18: 6,403,986 km (0.112 R)
• M19: 6,499,728 km (0.08 R)
• M20: 7,050,847 km (0.043 R)
• M21: 7,249,064 km (0.043 R)
• M22: 7,348,696 km (0.111 R)
• M23: 7,415,566 km (0.037 R)
• M24: 7,854,487 km (0.106 R)
• M25: 8,899,428 km (0.055 R)
• M26: 9,950,802 km (0.087 R)
• M27: 10,322,403 km (0.108 R)
• M28: 11,079,368 km (0.12 R)
• M29: 11,232,855 km (0.087 R)
• M30: 11,309,898 km (0.098 R)
• M31: 11,775,896 km (0.1 R)
• M32: 12,208,533 km (0.111 R)
• M33: 12,887,408 km (0.085 R)
• M34: 13,008,432 km (0.111 R)
• M35: 13,537,560 km (0.12 R)
• M36: 15,081,560 km (0.1 R)
• M37: 15,251,802 km (0.074 R)
• M38: 16,069,354 km (0.055 R)
• M39: 17,701,766 km (0.063 R)
• M40: 18,197,235 km (0.099 R)
• M41: 19,017,929 km (0.119 R)
• M42: 19,294,086 km (0.109 R)
• M43: 20,365,207 km (0.063 R)
• M44: 20,695,070 km (0.079 R)
• M45: 21,074,151 km (0.025 R)
• M46: 21,647,261 km (0.111 R)
• M47: 22,662,282 km (0.099 R)
• M48: 23,151,168 km (0.077 R)
• M49: 23,495,393 km (0.058 R)
• M50: 23,890,930 km (0.034 R)
• M51: 24,488,274 km (0.082 R)
• M52: 24,939,611 km (0.098 R)
• M53: 25,141,119 km (0.093 R)
• M54: 26,566,338 km (0.096 R)
• M55: 27,030,091 km (0.089 R)
• M56: 27,340,656 km (0.097 R)
• M57: 27,756,688 km (0.081 R)
• M58: 28,070,096 km (0.051 R)
• M59: 30,135,444 km (0.109 R)
• M60: 30,780,809 km (0.103 R)
• M61: 31,811,838 km (0.037 R)
• M62: 32,469,021 km (0.055 R)
• M63: 33,296,596 km (0.091 R)
• M64: 33,685,102 km (0.099 R)
• M65: 33,963,653 km (0.091 R)
• M66: 34,354,852 km (0.089 R)
• M67: 36,847,601 km (0.086 R)
• M68: 37,479,951 km (0.054 R)
• M69: 37,826,420 km (0.101 R)
• M70: 37,999,954 km (0.111 R)
• M71: 38,580,543 km (0.098 R)

Planet 7 - Gas Giant

Semi-Major Axis: 9.93 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 26

Radius: 15

Gravity: 0.12 G

Time & Orbit

Eccentricity (e): 0.127

Orbit Range: 8.67 AU - 11.19 AU

Year: 11851 Days

Day: 5.1 Hours

Environment

Temp: -190 °C

Axial Tilt: 2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (48)

Outer Limit: 53,379,807 km

• M1: 204,351 km (0.041 R)
• M2: 313,557 km (0.074 R)
• M3: 468,840 km (0.067 R)
• M4: 742,753 km (0.074 R)
• M5: 975,528 km (0.115 R)
• M6: 1,307,785 km (0.111 R)
• M7: 1,405,023 km (0.091 R)
• M8: 1,527,394 km (0.114 R)
• M9: 1,892,413 km (0.12 R)
• M10: 2,130,274 km (0.055 R)
• M11: 2,338,364 km (0.097 R)
• M12: 2,649,677 km (0.088 R)
• M13: 3,003,626 km (0.07 R)
• M14: 3,253,155 km (0.104 R)
• M15: 3,388,093 km (0.082 R)
• M16: 3,571,051 km (0.093 R)
• M17: 4,091,203 km (0.118 R)
• M18: 4,669,398 km (0.083 R)
• M19: 5,028,882 km (0.099 R)
• M20: 5,361,887 km (0.097 R)
• M21: 5,486,502 km (0.074 R)
• M22: 6,031,337 km (0.088 R)
• M23: 6,460,982 km (0.092 R)
• M24: 6,555,678 km (0.114 R)
• M25: 7,708,479 km (0.102 R)
• M26: 8,216,065 km (0.038 R)
• M27: 8,776,309 km (0.112 R)
• M28: 9,008,185 km (0.065 R)
• M29: 9,413,446 km (0.104 R)
• M30: 9,672,550 km (0.082 R)
• M31: 9,977,879 km (0.077 R)
• M32: 10,530,942 km (0.079 R)
• M33: 10,822,508 km (0.1 R)
• M34: 11,071,439 km (0.062 R)
• M35: 11,253,500 km (0.092 R)
• M36: 12,202,848 km (0.09 R)
• M37: 12,438,315 km (0.114 R)
• M38: 13,833,614 km (0.117 R)
• M39: 14,549,739 km (0.072 R)
• M40: 14,824,700 km (0.08 R)
• M41: 14,950,213 km (0.105 R)
• M42: 15,177,003 km (0.093 R)
• M43: 15,379,559 km (0.113 R)
• M44: 15,481,136 km (0.113 R)
• M45: 15,915,568 km (0.072 R)
• M46: 16,302,278 km (0.106 R)
• M47: 16,901,119 km (0.07 R)
• M48: 17,560,396 km (0.101 R)

Planet 8 - Ice Giant

Semi-Major Axis: 13.79 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 798.1

Radius: 7

Gravity: 16.29 G

Time & Orbit

Eccentricity (e): 0.1

Orbit Range: 12.41 AU - 15.17 AU

Year: 19395 Days

Day: 20.7 Hours

Environment

Temp: -189 °C

Axial Tilt: 168.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (91)

Outer Limit: 53,379,807 km

• M1: 165,455 km (0.03 R)
• M2: 308,620 km (0.095 R)
• M3: 514,766 km (0.044 R)
• M4: 1,296,714 km (0.058 R)
• M5: 1,476,531 km (0.103 R)
• M6: 1,728,753 km (0.104 R)
• M7: 2,063,254 km (0.032 R)
• M8: 2,167,524 km (0.091 R)
• M9: 2,417,651 km (0.077 R)
• M10: 2,868,090 km (0.088 R)
• M11: 3,675,320 km (0.111 R)
• M12: 4,324,276 km (0.117 R)
• M13: 4,822,437 km (0.031 R)
• M14: 4,868,663 km (0.08 R)
• M15: 4,914,888 km (0.111 R)
• M16: 5,774,179 km (0.103 R)
• M17: 5,921,981 km (0.094 R)
• M18: 6,474,147 km (0.11 R)
• M19: 6,679,096 km (0.07 R)
• M20: 6,938,349 km (0.111 R)
• M21: 7,466,579 km (0.112 R)
• M22: 7,735,556 km (0.115 R)
• M23: 9,070,418 km (0.07 R)
• M24: 9,531,030 km (0.091 R)
• M25: 9,999,271 km (0.083 R)
• M26: 10,117,454 km (0.098 R)
• M27: 10,415,153 km (0.078 R)
• M28: 11,019,080 km (0.101 R)
• M29: 11,758,692 km (0.106 R)
• M30: 11,820,925 km (0.109 R)
• M31: 11,883,456 km (0.104 R)
• M32: 11,945,988 km (0.06 R)
• M33: 12,008,670 km (0.082 R)
• M34: 14,005,801 km (0.099 R)
• M35: 14,604,642 km (0.079 R)
• M36: 14,940,938 km (0.083 R)
• M37: 15,621,309 km (0.083 R)
• M38: 16,941,360 km (0.032 R)
• M39: 17,865,127 km (0.065 R)
• M40: 19,539,127 km (0.054 R)
• M41: 20,732,918 km (0.113 R)
• M42: 22,489,945 km (0.081 R)
• M43: 23,112,273 km (0.026 R)
• M44: 23,190,512 km (0.119 R)
• M45: 23,268,752 km (0.027 R)
• M46: 24,056,235 km (0.111 R)
• M47: 26,634,554 km (0.067 R)
• M48: 27,045,350 km (0.037 R)
• M49: 27,210,207 km (0.072 R)
• M50: 27,540,968 km (0.116 R)
• M51: 30,577,356 km (0.084 R)
• M52: 33,718,014 km (0.057 R)
• M53: 33,984,298 km (0.102 R)
• M54: 36,321,465 km (0.033 R)
• M55: 39,175,344 km (0.082 R)
• M56: 39,455,242 km (0.112 R)
• M57: 40,487,617 km (0.092 R)
• M58: 40,959,747 km (0.042 R)
• M59: 41,718,957 km (0.057 R)
• M60: 42,962,564 km (0.107 R)
• M61: 43,251,288 km (0.054 R)
• M62: 43,444,119 km (0.113 R)
• M63: 44,509,854 km (0.092 R)
• M64: 46,173,832 km (0.046 R)
• M65: 46,370,852 km (0.102 R)
• M66: 47,658,740 km (0.041 R)
• M67: 48,057,418 km (0.109 R)
• M68: 49,966,138 km (0.11 R)
• M69: 50,777,108 km (0.117 R)
• M70: 51,286,189 km (0.116 R)
• M71: 51,592,416 km (0.059 R)
• M72: 51,899,391 km (0.045 R)
• M73: 52,104,340 km (0.1 R)
• M74: 52,926,679 km (0.116 R)
• M75: 53,132,975 km (0.029 R)
• M76: 55,314,860 km (0.084 R)
• M77: 55,524,147 km (0.115 R)
• M78: 57,102,554 km (0.086 R)
• M79: 57,314,086 km (0.117 R)
• M80: 57,525,916 km (0.103 R)
• M81: 58,269,418 km (0.095 R)
• M82: 59,873,107 km (0.097 R)
• M83: 62,033,899 km (0.119 R)
• M84: 63,342,581 km (0.097 R)
• M85: 68,330,772 km (0.057 R)
• M86: 69,230,603 km (0.09 R)
• M87: 69,795,036 km (0.054 R)
• M88: 73,098,756 km (0.089 R)
• M89: 76,569,725 km (0.082 R)
• M90: 76,686,262 km (0.062 R)
• M91: 77,972,953 km (0.117 R)

Planet 9 - Ice Giant

Semi-Major Axis: 16.43 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 148.7

Radius: 4.3

Gravity: 8.04 G

Time & Orbit

Eccentricity (e): 0.099

Orbit Range: 14.8 AU - 18.06 AU

Year: 25223 Days

Day: 15.5 Hours

Environment

Temp: -205 °C

Axial Tilt: 14.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (97)

Outer Limit: 53,379,807 km

• M1: 132,544 km (0.076 R)
• M2: 182,210 km (0.035 R)
• M3: 251,773 km (0.112 R)
• M4: 358,736 km (0.119 R)
• M5: 387,758 km (0.046 R)
• M6: 545,583 km (0.117 R)
• M7: 1,019,958 km (0.119 R)
• M8: 1,260,063 km (0.073 R)
• M9: 1,351,766 km (0.049 R)
• M10: 1,590,375 km (0.041 R)
• M11: 1,790,687 km (0.042 R)
• M12: 1,998,927 km (0.079 R)
• M13: 2,325,798 km (0.109 R)
• M14: 2,495,592 km (0.102 R)
• M15: 2,581,910 km (0.096 R)
• M16: 3,339,174 km (0.087 R)
• M17: 3,990,822 km (0.111 R)
• M18: 6,879,856 km (0.102 R)
• M19: 7,204,933 km (0.063 R)
• M20: 7,869,895 km (0.076 R)
• M21: 7,954,418 km (0.105 R)
• M22: 8,166,997 km (0.079 R)
• M23: 8,295,501 km (0.113 R)
• M24: 9,213,134 km (0.114 R)
• M25: 9,616,151 km (0.057 R)
• M26: 9,706,508 km (0.074 R)
• M27: 10,718,987 km (0.043 R)
• M28: 10,906,582 km (0.036 R)
• M29: 11,000,829 km (0.103 R)
• M30: 11,237,642 km (0.106 R)
• M31: 11,285,215 km (0.071 R)
• M32: 11,958,106 km (0.076 R)
• M33: 12,055,195 km (0.068 R)
• M34: 12,842,080 km (0.117 R)
• M35: 13,443,014 km (0.07 R)
• M36: 14,104,386 km (0.069 R)
• M37: 14,309,934 km (0.105 R)
• M38: 15,037,428 km (0.11 R)
• M39: 15,142,446 km (0.089 R)
• M40: 15,194,955 km (0.113 R)
• M41: 15,723,634 km (0.113 R)
• M42: 15,990,367 km (0.096 R)
• M43: 16,636,330 km (0.054 R)
• M44: 16,744,938 km (0.069 R)
• M45: 17,126,563 km (0.116 R)
• M46: 17,345,873 km (0.075 R)
• M47: 17,676,634 km (0.099 R)
• M48: 17,787,336 km (0.109 R)
• M49: 18,907,226 km (0.111 R)
• M50: 19,247,561 km (0.085 R)
• M51: 19,361,405 km (0.112 R)
• M52: 19,991,960 km (0.102 R)
• M53: 20,049,705 km (0.098 R)
• M54: 21,982,958 km (0.1 R)
• M55: 22,161,728 km (0.098 R)
• M56: 23,002,019 km (0.07 R)
• M57: 23,669,525 km (0.092 R)
• M58: 23,730,411 km (0.095 R)
• M59: 24,036,189 km (0.096 R)
• M60: 24,404,798 km (0.115 R)
• M61: 28,386,794 km (0.105 R)
• M62: 30,551,476 km (0.115 R)
• M63: 32,836,583 km (0.07 R)
• M64: 33,724,596 km (0.108 R)
• M65: 34,344,230 km (0.09 R)
• M66: 34,551,423 km (0.076 R)
• M67: 34,967,455 km (0.079 R)
• M68: 36,718,199 km (0.081 R)
• M69: 37,142,608 km (0.08 R)
• M70: 37,355,336 km (0.097 R)
• M71: 37,924,855 km (0.117 R)
• M72: 38,067,721 km (0.108 R)
• M73: 38,353,902 km (0.072 R)
• M74: 39,361,145 km (0.108 R)
• M75: 39,433,400 km (0.086 R)
• M76: 39,723,022 km (0.077 R)
• M77: 41,181,302 km (0.101 R)
• M78: 41,622,167 km (0.056 R)
• M79: 41,917,024 km (0.085 R)
• M80: 42,138,579 km (0.055 R)
• M81: 42,212,480 km (0.119 R)
• M82: 43,177,685 km (0.095 R)
• M83: 44,526,011 km (0.077 R)
• M84: 44,827,600 km (0.071 R)
• M85: 44,902,998 km (0.083 R)
• M86: 45,812,104 km (0.037 R)
• M87: 45,964,245 km (0.106 R)
• M88: 46,574,305 km (0.119 R)
• M89: 46,650,750 km (0.085 R)
• M90: 46,803,788 km (0.103 R)
• M91: 47,725,461 km (0.118 R)
• M92: 48,343,300 km (0.107 R)
• M93: 49,899,267 km (0.064 R)
• M94: 50,447,693 km (0.089 R)
• M95: 50,840,687 km (0.053 R)
• M96: 52,184,524 km (0.105 R)
• M97: 52,263,811 km (0.079 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: 355 - 19,156 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit