🌌 Stone's Star System Generator

Planet 1 - Gas Giant

Semi-Major Axis: 0.63 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 288.1

Radius: 13.7

Gravity: 1.53 G

Time & Orbit

Eccentricity (e): 0.189

Orbit Range: 0.51 AU - 0.75 AU

Year: 351 Days

Day: 13.2 Hours

Environment

Temp: -162 °C

Axial Tilt: 13.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (30)

Outer Limit: 26,176,260 km

• M1: 170,691 km (0.096 R)
• M2: 286,779 km (0.096 R)
• M3: 375,790 km (0.06 R)
• M4: 468,241 km (0.099 R)
• M5: 581,936 km (0.052 R)
• M6: 689,945 km (0.09 R)
• M7: 809,175 km (0.117 R)
• M8: 929,751 km (0.104 R)
• M9: 1,102,088 km (0.117 R)
• M10: 1,190,799 km (0.049 R)
• M11: 1,289,683 km (0.115 R)
• M12: 1,399,039 km (0.113 R)
• M13: 1,531,583 km (0.088 R)
• M14: 1,685,070 km (0.093 R)
• M15: 1,916,498 km (0.062 R)
• M16: 2,056,223 km (0.105 R)
• M17: 2,149,721 km (0.1 R)
• M18: 2,244,866 km (0.089 R)
• M19: 2,444,130 km (0.087 R)
• M20: 2,591,484 km (0.068 R)
• M21: 2,751,703 km (0.084 R)
• M22: 2,950,519 km (0.085 R)
• M23: 3,036,388 km (0.12 R)
• M24: 3,210,969 km (0.08 R)
• M25: 3,304,617 km (0.055 R)
• M26: 3,420,555 km (0.113 R)
• M27: 3,516,448 km (0.088 R)
• M28: 3,613,237 km (0.115 R)
• M29: 3,710,925 km (0.04 R)
• M30: 3,831,501 km (0.098 R)

Planet 2 - Gas Giant

Semi-Major Axis: 0.88 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 385.2

Radius: 8.4

Gravity: 5.46 G

Time & Orbit

Eccentricity (e): 0.118

Orbit Range: 0.78 AU - 0.98 AU

Year: 580 Days

Day: 11.8 Hours

Environment

Temp: -177 °C

Axial Tilt: 49.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (51)

Outer Limit: 26,176,260 km

• M1: 104,719 km (0.053 R)
• M2: 196,572 km (0.103 R)
• M3: 251,324 km (0.106 R)
• M4: 316,998 km (0.08 R)
• M5: 371,302 km (0.033 R)
• M6: 460,013 km (0.118 R)
• M7: 553,063 km (0.096 R)
• M8: 609,911 km (0.086 R)
• M9: 709,692 km (0.034 R)
• M10: 863,479 km (0.1 R)
• M11: 958,324 km (0.047 R)
• M12: 1,028,336 km (0.111 R)
• M13: 1,100,292 km (0.074 R)
• M14: 1,183,768 km (0.112 R)
• M15: 1,352,365 km (0.109 R)
• M16: 1,458,280 km (0.104 R)
• M17: 1,512,434 km (0.113 R)
• M18: 1,617,003 km (0.086 R)
• M19: 1,684,472 km (0.099 R)
• M20: 1,833,771 km (0.066 R)
• M21: 1,886,579 km (0.06 R)
• M22: 1,957,638 km (0.068 R)
• M23: 2,053,829 km (0.092 R)
• M24: 2,108,732 km (0.078 R)
• M25: 2,201,333 km (0.075 R)
• M26: 2,390,424 km (0.103 R)
• M27: 2,467,766 km (0.12 R)
• M28: 2,764,718 km (0.059 R)
• M29: 2,818,723 km (0.107 R)
• M30: 2,873,027 km (0.083 R)
• M31: 3,080,071 km (0.094 R)
• M32: 3,306,412 km (0.04 R)
• M33: 3,604,411 km (0.104 R)
• M34: 3,842,870 km (0.075 R)
• M35: 4,063,677 km (0.068 R)
• M36: 4,171,686 km (0.074 R)
• M37: 4,233,919 km (0.073 R)
• M38: 4,327,717 km (0.085 R)
• M39: 4,414,334 km (0.091 R)
• M40: 4,549,421 km (0.076 R)
• M41: 4,605,370 km (0.084 R)
• M42: 4,710,089 km (0.113 R)
• M43: 4,831,712 km (0.079 R)
• M44: 4,929,848 km (0.081 R)
• M45: 5,053,566 km (0.12 R)
• M46: 5,144,820 km (0.042 R)
• M47: 5,354,407 km (0.051 R)
• M48: 5,447,606 km (0.106 R)
• M49: 5,669,759 km (0.118 R)
• M50: 5,834,167 km (0.119 R)
• M51: 5,903,730 km (0.062 R)

Planet 3 - Gas Giant

Semi-Major Axis: 1.3 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 479.1

Radius: 13.4

Gravity: 2.67 G

Time & Orbit

Eccentricity (e): 0.147

Orbit Range: 1.11 AU - 1.49 AU

Year: 1042 Days

Day: 13.1 Hours

Environment

Temp: -186 °C

Axial Tilt: 7.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (56)

Outer Limit: 26,176,260 km

• M1: 167,400 km (0.12 R)
• M2: 260,899 km (0.091 R)
• M3: 352,901 km (0.119 R)
• M4: 459,265 km (0.1 R)
• M5: 551,268 km (0.12 R)
• M6: 736,919 km (0.081 R)
• M7: 896,989 km (0.06 R)
• M8: 1,128,118 km (0.035 R)
• M9: 1,372,411 km (0.115 R)
• M10: 1,472,193 km (0.117 R)
• M11: 1,559,857 km (0.054 R)
• M12: 1,656,946 km (0.113 R)
• M13: 1,771,688 km (0.089 R)
• M14: 1,936,993 km (0.1 R)
• M15: 2,074,623 km (0.057 R)
• M16: 2,266,408 km (0.069 R)
• M17: 2,394,613 km (0.12 R)
• M18: 2,578,469 km (0.068 R)
• M19: 2,739,735 km (0.041 R)
• M20: 3,053,891 km (0.048 R)
• M21: 3,158,011 km (0.042 R)
• M22: 3,340,820 km (0.036 R)
• M23: 3,527,219 km (0.106 R)
• M24: 3,616,828 km (0.12 R)
• M25: 3,727,231 km (0.101 R)
• M26: 3,931,133 km (0.074 R)
• M27: 4,170,190 km (0.102 R)
• M28: 4,254,414 km (0.12 R)
• M29: 4,339,236 km (0.07 R)
• M30: 4,424,656 km (0.101 R)
• M31: 4,651,746 km (0.12 R)
• M32: 4,772,172 km (0.111 R)
• M33: 5,038,755 km (0.077 R)
• M34: 5,185,212 km (0.095 R)
• M35: 5,644,776 km (0.091 R)
• M36: 5,914,950 km (0.081 R)
• M37: 6,021,913 km (0.069 R)
• M38: 6,165,527 km (0.077 R)
• M39: 6,249,750 km (0.079 R)
• M40: 6,358,657 km (0.114 R)
• M41: 6,504,964 km (0.069 R)
• M42: 6,726,519 km (0.1 R)
• M43: 7,113,977 km (0.079 R)
• M44: 7,534,347 km (0.054 R)
• M45: 7,702,196 km (0.118 R)
• M46: 7,923,750 km (0.086 R)
• M47: 8,068,112 km (0.027 R)
• M48: 8,173,728 km (0.109 R)
• M49: 8,292,958 km (0.029 R)
• M50: 8,439,713 km (0.107 R)
• M51: 8,789,772 km (0.118 R)
• M52: 8,884,917 km (0.07 R)
• M53: 9,021,350 km (0.106 R)
• M54: 9,131,005 km (0.119 R)
• M55: 9,282,548 km (0.032 R)
• M56: 9,420,926 km (0.077 R)

Planet 4 - Gas Giant

Semi-Major Axis: 1.7 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 962.2

Radius: 13

Gravity: 5.69 G

Time & Orbit

Eccentricity (e): 0.237

Orbit Range: 1.3 AU - 2.1 AU

Year: 1558 Days

Day: 10.5 Hours

Environment

Temp: -204 °C

Axial Tilt: 71.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (65)

Outer Limit: 26,176,260 km

• M1: 165,605 km (0.076 R)
• M2: 258,056 km (0.073 R)
• M3: 376,538 km (0.056 R)
• M4: 471,233 km (0.058 R)
• M5: 640,877 km (0.059 R)
• M6: 738,265 km (0.076 R)
• M7: 882,627 km (0.09 R)
• M8: 967,449 km (0.048 R)
• M9: 1,109,418 km (0.101 R)
• M10: 1,258,866 km (0.059 R)
• M11: 1,405,472 km (0.097 R)
• M12: 1,610,271 km (0.102 R)
• M13: 1,705,865 km (0.098 R)
• M14: 1,913,955 km (0.083 R)
• M15: 2,038,421 km (0.092 R)
• M16: 2,154,060 km (0.081 R)
• M17: 2,248,157 km (0.108 R)
• M18: 2,638,757 km (0.119 R)
• M19: 2,778,182 km (0.064 R)
• M20: 3,144,098 km (0.12 R)
• M21: 3,251,659 km (0.078 R)
• M22: 3,387,644 km (0.106 R)
• M23: 3,693,871 km (0.105 R)
• M24: 3,807,565 km (0.058 R)
• M25: 4,038,395 km (0.106 R)
• M26: 4,229,431 km (0.053 R)
• M27: 4,318,591 km (0.048 R)
• M28: 5,054,762 km (0.12 R)
• M29: 5,213,187 km (0.096 R)
• M30: 5,389,263 km (0.046 R)
• M31: 5,763,856 km (0.098 R)
• M32: 5,946,067 km (0.098 R)
• M33: 6,113,467 km (0.116 R)
• M34: 6,555,827 km (0.112 R)
• M35: 6,711,559 km (0.075 R)
• M36: 6,885,840 km (0.104 R)
• M37: 7,185,784 km (0.117 R)
• M38: 7,598,375 km (0.073 R)
• M39: 7,871,541 km (0.088 R)
• M40: 8,037,146 km (0.066 R)
• M41: 8,521,843 km (0.06 R)
• M42: 8,996,966 km (0.107 R)
• M43: 9,170,200 km (0.107 R)
• M44: 9,344,481 km (0.059 R)
• M45: 9,735,680 km (0.111 R)
• M46: 9,834,414 km (0.082 R)
• M47: 10,032,781 km (0.071 R)
• M48: 10,393,162 km (0.115 R)
• M49: 10,635,810 km (0.102 R)
• M50: 10,757,732 km (0.028 R)
• M51: 10,962,233 km (0.048 R)
• M52: 11,085,501 km (0.041 R)
• M53: 11,354,179 km (0.068 R)
• M54: 11,541,476 km (0.108 R)
• M55: 11,813,893 km (0.077 R)
• M56: 11,898,117 km (0.092 R)
• M57: 12,003,584 km (0.107 R)
• M58: 12,109,499 km (0.045 R)
• M59: 12,450,432 km (0.06 R)
• M60: 13,470,391 km (0.105 R)
• M61: 13,602,486 km (0.086 R)
• M62: 14,068,333 km (0.062 R)
• M63: 14,992,998 km (0.118 R)
• M64: 15,244,472 km (0.112 R)
• M65: 15,474,254 km (0.108 R)

Planet 5 - Gas Giant

Semi-Major Axis: 2.11 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 754.2

Radius: 11

Gravity: 6.23 G

Time & Orbit

Eccentricity (e): 0.013

Orbit Range: 2.08 AU - 2.14 AU

Year: 2154 Days

Day: 8.2 Hours

Environment

Temp: -204 °C

Axial Tilt: 0.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (69)

Outer Limit: 26,176,260 km

• M1: 144,960 km (0.118 R)
• M2: 219,460 km (0.114 R)
• M3: 346,169 km (0.102 R)
• M4: 436,078 km (0.091 R)
• M5: 513,869 km (0.12 R)
• M6: 597,643 km (0.084 R)
• M7: 695,032 km (0.115 R)
• M8: 852,259 km (0.118 R)
• M9: 935,735 km (0.084 R)
• M10: 1,255,874 km (0.075 R)
• M11: 1,363,136 km (0.118 R)
• M12: 1,495,979 km (0.071 R)
• M13: 1,680,134 km (0.049 R)
• M14: 1,775,128 km (0.046 R)
• M15: 1,884,185 km (0.064 R)
• M16: 1,970,653 km (0.069 R)
• M17: 2,396,259 km (0.079 R)
• M18: 2,490,356 km (0.089 R)
• M19: 2,822,313 km (0.106 R)
• M20: 3,008,114 km (0.114 R)
• M21: 3,139,311 km (0.04 R)
• M22: 3,407,092 km (0.071 R)
• M23: 3,965,241 km (0.085 R)
• M24: 4,304,230 km (0.088 R)
• M25: 5,096,500 km (0.112 R)
• M26: 5,166,063 km (0.118 R)
• M27: 5,733,638 km (0.118 R)
• M28: 5,896,998 km (0.095 R)
• M29: 5,988,403 km (0.068 R)
• M30: 6,080,256 km (0.106 R)
• M31: 6,154,008 km (0.05 R)
• M32: 6,452,306 km (0.083 R)
• M33: 7,474,358 km (0.092 R)
• M34: 7,692,771 km (0.108 R)
• M35: 8,054,798 km (0.089 R)
• M36: 8,217,411 km (0.062 R)
• M37: 8,401,865 km (0.114 R)
• M38: 8,816,401 km (0.052 R)
• M39: 9,174,089 km (0.12 R)
• M40: 9,344,033 km (0.075 R)
• M41: 9,925,520 km (0.115 R)
• M42: 10,012,585 km (0.039 R)
• M43: 10,297,569 km (0.096 R)
• M44: 10,429,964 km (0.098 R)
• M45: 10,741,277 km (0.088 R)
• M46: 11,145,939 km (0.039 R)
• M47: 11,259,185 km (0.093 R)
• M48: 11,395,618 km (0.065 R)
• M49: 11,555,538 km (0.119 R)
• M50: 11,785,320 km (0.084 R)
• M51: 12,296,047 km (0.074 R)
• M52: 12,460,156 km (0.098 R)
• M53: 12,719,409 km (0.094 R)
• M54: 12,885,313 km (0.09 R)
• M55: 12,956,672 km (0.048 R)
• M56: 13,123,623 km (0.117 R)
• M57: 13,604,580 km (0.108 R)
• M58: 14,042,453 km (0.032 R)
• M59: 14,140,290 km (0.094 R)
• M60: 14,633,365 km (0.097 R)
• M61: 14,782,364 km (0.101 R)
• M62: 14,881,996 km (0.064 R)
• M63: 15,057,026 km (0.117 R)
• M64: 15,459,294 km (0.105 R)
• M65: 16,146,248 km (0.055 R)
• M66: 16,326,064 km (0.099 R)
• M67: 16,973,374 km (0.093 R)
• M68: 17,339,590 km (0.119 R)
• M69: 17,549,925 km (0.117 R)

Planet 6 - Gas Giant

Semi-Major Axis: 3.08 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 579.2

Radius: 8.1

Gravity: 8.83 G

Time & Orbit

Eccentricity (e): 0.138

Orbit Range: 2.65 AU - 3.51 AU

Year: 3800 Days

Day: 13.4 Hours

Environment

Temp: -203 °C

Axial Tilt: 21.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (80)

Outer Limit: 26,176,260 km

• M1: 101,427 km (0.117 R)
• M2: 200,012 km (0.027 R)
• M3: 255,812 km (0.111 R)
• M4: 389,553 km (0.109 R)
• M5: 587,022 km (0.077 R)
• M6: 1,000,062 km (0.032 R)
• M7: 1,394,551 km (0.096 R)
• M8: 1,448,855 km (0.101 R)
• M9: 1,503,907 km (0.095 R)
• M10: 1,687,614 km (0.119 R)
• M11: 1,863,840 km (0.057 R)
• M12: 2,015,383 km (0.069 R)
• M13: 2,186,822 km (0.066 R)
• M14: 2,527,306 km (0.094 R)
• M15: 2,644,591 km (0.117 R)
• M16: 2,919,402 km (0.039 R)
• M17: 3,078,126 km (0.055 R)
• M18: 3,294,145 km (0.053 R)
• M19: 3,703,146 km (0.093 R)
• M20: 3,971,823 km (0.062 R)
• M21: 4,108,556 km (0.053 R)
• M22: 4,167,647 km (0.1 R)
• M23: 4,346,566 km (0.078 R)
• M24: 4,507,833 km (0.114 R)
• M25: 4,671,044 km (0.09 R)
• M26: 4,815,406 km (0.068 R)
• M27: 4,919,526 km (0.064 R)
• M28: 5,712,843 km (0.117 R)
• M29: 5,978,679 km (0.109 R)
• M30: 6,499,429 km (0.064 R)
• M31: 6,591,432 km (0.109 R)
• M32: 6,753,596 km (0.069 R)
• M33: 7,463,587 km (0.088 R)
• M34: 7,560,078 km (0.052 R)
• M35: 7,632,633 km (0.099 R)
• M36: 7,778,491 km (0.094 R)
• M37: 7,876,328 km (0.062 R)
• M38: 8,774,962 km (0.083 R)
• M39: 8,876,838 km (0.076 R)
• M40: 9,679,431 km (0.105 R)
• M41: 10,209,606 km (0.045 R)
• M42: 10,613,371 km (0.116 R)
• M43: 10,858,113 km (0.093 R)
• M44: 11,912,179 km (0.095 R)
• M45: 11,996,702 km (0.113 R)
• M46: 12,422,757 km (0.077 R)
• M47: 12,940,515 km (0.096 R)
• M48: 13,524,096 km (0.083 R)
• M49: 14,265,653 km (0.086 R)
• M50: 14,505,758 km (0.096 R)
• M51: 14,596,115 km (0.067 R)
• M52: 14,868,383 km (0.109 R)
• M53: 15,081,261 km (0.079 R)
• M54: 15,264,518 km (0.064 R)
• M55: 15,974,061 km (0.091 R)
• M56: 16,317,238 km (0.085 R)
• M57: 16,379,920 km (0.114 R)
• M58: 16,757,505 km (0.115 R)
• M59: 16,852,350 km (0.04 R)
• M60: 17,042,489 km (0.046 R)
• M61: 17,169,796 km (0.088 R)
• M62: 17,585,379 km (0.087 R)
• M63: 17,649,706 km (0.11 R)
• M64: 17,972,090 km (0.098 R)
• M65: 18,069,179 km (0.094 R)
• M66: 18,296,418 km (0.084 R)
• M67: 19,115,766 km (0.104 R)
• M68: 19,247,860 km (0.088 R)
• M69: 19,347,193 km (0.112 R)
• M70: 20,181,800 km (0.045 R)
• M71: 20,316,438 km (0.112 R)
• M72: 20,417,566 km (0.11 R)
• M73: 20,586,612 km (0.082 R)
• M74: 21,164,658 km (0.063 R)
• M75: 21,438,422 km (0.077 R)
• M76: 22,510,740 km (0.088 R)
• M77: 22,685,320 km (0.106 R)
• M78: 22,790,188 km (0.089 R)
• M79: 23,458,741 km (0.073 R)
• M80: 23,671,170 km (0.066 R)

Planet 7 - Gas Giant

Semi-Major Axis: 3.74 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 431.6

Radius: 14.4

Gravity: 2.08 G

Time & Orbit

Eccentricity (e): 0.014

Orbit Range: 3.69 AU - 3.79 AU

Year: 5084 Days

Day: 12.8 Hours

Environment

Temp: -219 °C

Axial Tilt: 6.9 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (74)

Outer Limit: 26,176,260 km

• M1: 241,900 km (0.04 R)
• M2: 349,311 km (0.059 R)
• M3: 570,716 km (0.101 R)
• M4: 778,358 km (0.078 R)
• M5: 880,982 km (0.096 R)
• M6: 1,179,729 km (0.049 R)
• M7: 1,425,817 km (0.105 R)
• M8: 1,659,340 km (0.101 R)
• M9: 2,049,790 km (0.089 R)
• M10: 2,417,651 km (0.099 R)
• M11: 2,662,992 km (0.055 R)
• M12: 2,807,054 km (0.081 R)
• M13: 3,121,808 km (0.068 R)
• M14: 3,989,626 km (0.059 R)
• M15: 4,323,378 km (0.061 R)
• M16: 4,709,640 km (0.106 R)
• M17: 4,907,109 km (0.06 R)
• M18: 5,084,981 km (0.085 R)
• M19: 5,470,046 km (0.075 R)
• M20: 5,771,037 km (0.082 R)
• M21: 6,053,777 km (0.065 R)
• M22: 6,317,069 km (0.075 R)
• M23: 6,486,414 km (0.116 R)
• M24: 6,657,554 km (0.107 R)
• M25: 6,805,357 km (0.106 R)
• M26: 7,637,719 km (0.084 R)
• M27: 8,342,774 km (0.116 R)
• M28: 8,555,801 km (0.044 R)
• M29: 9,014,319 km (0.092 R)
• M30: 9,731,192 km (0.063 R)
• M31: 9,955,589 km (0.072 R)
• M32: 10,266,752 km (0.07 R)
• M33: 10,667,675 km (0.112 R)
• M34: 10,841,058 km (0.105 R)
• M35: 10,986,168 km (0.06 R)
• M36: 11,603,110 km (0.096 R)
• M37: 12,050,707 km (0.08 R)
• M38: 12,352,147 km (0.03 R)
• M39: 12,778,650 km (0.12 R)
• M40: 12,932,138 km (0.079 R)
• M41: 13,055,257 km (0.12 R)
• M42: 13,489,689 km (0.096 R)
• M43: 13,645,869 km (0.116 R)
• M44: 13,897,193 km (0.12 R)
• M45: 14,660,442 km (0.095 R)
• M46: 14,885,587 km (0.115 R)
• M47: 15,111,928 km (0.098 R)
• M48: 15,404,691 km (0.076 R)
• M49: 17,200,015 km (0.06 R)
• M50: 17,539,752 km (0.107 R)
• M51: 18,225,957 km (0.084 R)
• M52: 18,746,259 km (0.086 R)
• M53: 18,955,845 km (0.09 R)
• M54: 19,131,024 km (0.104 R)
• M55: 19,271,646 km (0.117 R)
• M56: 19,377,263 km (0.067 R)
• M57: 19,483,028 km (0.112 R)
• M58: 19,695,308 km (0.108 R)
• M59: 19,943,939 km (0.093 R)
• M60: 20,229,372 km (0.069 R)
• M61: 20,480,248 km (0.067 R)
• M62: 20,732,021 km (0.113 R)
• M63: 21,021,194 km (0.083 R)
• M64: 21,970,093 km (0.035 R)
• M65: 22,486,954 km (0.072 R)
• M66: 23,157,302 km (0.119 R)
• M67: 23,307,049 km (0.101 R)
• M68: 23,532,493 km (0.116 R)
• M69: 23,645,439 km (0.09 R)
• M70: 24,213,014 km (0.059 R)
• M71: 24,900,117 km (0.089 R)
• M72: 25,130,498 km (0.079 R)
• M73: 25,864,873 km (0.04 R)
• M74: 26,059,351 km (0.09 R)

Kuiper Belt

Range: 30 - 55 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 339 - 17,157 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit