🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 1.04 AU

Status: HZ

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 0.44

Radius: 0.72

Gravity: 0.85 G

Time & Orbit

Eccentricity (e): 0.016

Orbit Range: 1.02 AU - 1.06 AU

Year: 391 Days

Day: 17.4 Hours

Environment

Temp: 6 °C

Axial Tilt: 36.6 °

Atmosphere: N₂, O₂

Biome: Arid/Tundra

Satellites (1)

Outer Limit: 27,973,342 km

• M1: 300,093 km (0.062 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1.46 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.25

Radius: 1.38

Gravity: 1.18 G

Time & Orbit

Eccentricity (e): 0.224

Orbit Range: 1.13 AU - 1.79 AU

Year: 651 Days

Day: 24.6 Hours

Environment

Temp: -27 °C

Axial Tilt: 8.2 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Asteroid Belt

Center: 1.89 AU

Composition

Type: Inner System (Rocky)

A dense region of planetesimals and debris.

Boundary

Planet 3 - Terrestrial

Semi-Major Axis: 2.32 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.25

Radius: 1.38

Gravity: 1.18 G

Time & Orbit

Eccentricity (e): 0.184

Orbit Range: 1.89 AU - 2.75 AU

Year: 1304 Days

Day: 43.2 Hours

Environment

Temp: -91 °C

Axial Tilt: 38.3 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 4 - Terrestrial

Semi-Major Axis: 4.43 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.63

Radius: 1.67

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.131

Orbit Range: 3.85 AU - 5.01 AU

Year: 3440 Days

Day: 37.3 Hours

Environment

Temp: -137 °C

Axial Tilt: 9.1 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 27,973,342 km

• M1: 2,914,167 km (0.093 R)

Planet 5 - Gas Giant

Semi-Major Axis: 4.8 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 841.7

Radius: 11.8

Gravity: 6.04 G

Time & Orbit

Eccentricity (e): 0.077

Orbit Range: 4.43 AU - 5.17 AU

Year: 3880 Days

Day: 9 Hours

Environment

Temp: -145 °C

Axial Tilt: 15.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (75)

Outer Limit: 27,973,342 km

• M1: 149,149 km (0.084 R)
• M2: 229,483 km (0.065 R)
• M3: 309,668 km (0.074 R)
• M4: 784,641 km (0.06 R)
• M5: 1,110,914 km (0.088 R)
• M6: 1,494,184 km (0.107 R)
• M7: 1,569,730 km (0.087 R)
• M8: 1,836,613 km (0.094 R)
• M9: 1,983,967 km (0.087 R)
• M10: 2,169,618 km (0.055 R)
• M11: 2,378,756 km (0.11 R)
• M12: 2,686,628 km (0.049 R)
• M13: 2,873,775 km (0.094 R)
• M14: 3,400,808 km (0.084 R)
• M15: 3,542,328 km (0.09 R)
• M16: 3,915,575 km (0.099 R)
• M17: 4,064,275 km (0.032 R)
• M18: 4,236,462 km (0.107 R)
• M19: 4,389,052 km (0.089 R)
• M20: 4,972,184 km (0.072 R)
• M21: 5,461,070 km (0.104 R)
• M22: 6,014,433 km (0.037 R)
• M23: 6,137,103 km (0.1 R)
• M24: 6,661,444 km (0.092 R)
• M25: 6,762,871 km (0.098 R)
• M26: 7,226,176 km (0.053 R)
• M27: 7,461,792 km (0.058 R)
• M28: 7,833,244 km (0.102 R)
• M29: 8,346,963 km (0.067 R)
• M30: 8,511,520 km (0.108 R)
• M31: 8,594,248 km (0.099 R)
• M32: 8,788,277 km (0.077 R)
• M33: 8,871,752 km (0.077 R)
• M34: 9,039,751 km (0.048 R)
• M35: 9,152,398 km (0.101 R)
• M36: 9,293,768 km (0.062 R)
• M37: 9,578,602 km (0.088 R)
• M38: 10,747,111 km (0.106 R)
• M39: 11,378,564 km (0.119 R)
• M40: 11,867,749 km (0.046 R)
• M41: 12,021,984 km (0.087 R)
• M42: 12,677,223 km (0.089 R)
• M43: 12,898,328 km (0.113 R)
• M44: 12,993,473 km (0.107 R)
• M45: 14,745,264 km (0.091 R)
• M46: 14,944,528 km (0.09 R)
• M47: 15,077,820 km (0.112 R)
• M48: 15,581,366 km (0.081 R)
• M49: 16,056,190 km (0.045 R)
• M50: 16,398,320 km (0.098 R)
• M51: 17,264,193 km (0.077 R)
• M52: 17,932,297 km (0.105 R)
• M53: 18,216,084 km (0.117 R)
• M54: 18,394,105 km (0.086 R)
• M55: 18,501,367 km (0.026 R)
• M56: 19,402,395 km (0.083 R)
• M57: 19,730,314 km (0.054 R)
• M58: 20,465,587 km (0.059 R)
• M59: 20,613,689 km (0.118 R)
• M60: 20,762,240 km (0.077 R)
• M61: 20,948,339 km (0.082 R)
• M62: 21,623,026 km (0.082 R)
• M63: 21,736,122 km (0.087 R)
• M64: 22,342,741 km (0.063 R)
• M65: 22,609,923 km (0.088 R)
• M66: 23,031,939 km (0.068 R)
• M67: 24,000,884 km (0.087 R)
• M68: 24,943,351 km (0.104 R)
• M69: 25,101,625 km (0.105 R)
• M70: 25,299,992 km (0.105 R)
• M71: 25,778,107 km (0.108 R)
• M72: 26,138,638 km (0.11 R)
• M73: 26,500,814 km (0.082 R)
• M74: 26,581,597 km (0.08 R)
• M75: 26,945,718 km (0.117 R)

Planet 6 - Gas Giant

Semi-Major Axis: 5.92 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 447.6

Radius: 11.1

Gravity: 3.63 G

Time & Orbit

Eccentricity (e): 0.006

Orbit Range: 5.88 AU - 5.96 AU

Year: 5314 Days

Day: 14.6 Hours

Environment

Temp: -159 °C

Axial Tilt: 20.6 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 27,973,342 km

• M1: 173,683 km (0.049 R)
• M2: 300,841 km (0.078 R)
• M3: 397,182 km (0.12 R)
• M4: 478,713 km (0.059 R)
• M5: 619,485 km (0.08 R)
• M6: 729,589 km (0.053 R)
• M7: 858,991 km (0.111 R)
• M8: 983,756 km (0.042 R)
• M9: 1,128,566 km (0.109 R)
• M10: 1,499,868 km (0.081 R)
• M11: 1,779,018 km (0.099 R)
• M12: 2,007,753 km (0.025 R)
• M13: 2,177,098 km (0.026 R)
• M14: 2,298,571 km (0.096 R)
• M15: 2,769,655 km (0.042 R)
• M16: 3,016,641 km (0.093 R)
• M17: 3,152,626 km (0.099 R)
• M18: 3,251,061 km (0.097 R)
• M19: 3,968,532 km (0.075 R)
• M20: 4,117,981 km (0.109 R)
• M21: 4,466,394 km (0.062 R)
• M22: 4,644,266 km (0.115 R)
• M23: 4,984,152 km (0.115 R)
• M24: 5,191,944 km (0.061 R)
• M25: 6,249,002 km (0.081 R)
• M26: 6,448,267 km (0.076 R)
• M27: 6,725,621 km (0.116 R)
• M28: 6,904,241 km (0.096 R)
• M29: 7,292,298 km (0.106 R)
• M30: 7,607,949 km (0.078 R)
• M31: 8,143,958 km (0.027 R)
• M32: 8,279,793 km (0.067 R)
• M33: 8,443,902 km (0.058 R)
• M34: 8,775,411 km (0.088 R)
• M35: 8,942,811 km (0.103 R)
• M36: 9,055,010 km (0.093 R)
• M37: 9,536,864 km (0.101 R)
• M38: 9,622,733 km (0.094 R)
• M39: 10,260,768 km (0.085 R)
• M40: 10,852,727 km (0.118 R)
• M41: 11,182,890 km (0.091 R)
• M42: 11,334,133 km (0.034 R)
• M43: 11,516,642 km (0.105 R)
• M44: 12,411,836 km (0.109 R)
• M45: 12,662,712 km (0.087 R)
• M46: 12,820,388 km (0.026 R)
• M47: 12,915,233 km (0.091 R)
• M48: 13,010,377 km (0.118 R)
• M49: 13,715,432 km (0.109 R)
• M50: 13,877,297 km (0.112 R)
• M51: 14,564,549 km (0.081 R)
• M52: 14,729,706 km (0.11 R)
• M53: 15,195,853 km (0.096 R)
• M54: 15,768,214 km (0.066 R)
• M55: 16,760,945 km (0.113 R)
• M56: 16,864,766 km (0.09 R)
• M57: 17,352,306 km (0.088 R)
• M58: 17,457,324 km (0.082 R)
• M59: 17,527,485 km (0.071 R)
• M60: 17,597,796 km (0.118 R)
• M61: 18,056,762 km (0.052 R)
• M62: 18,842,600 km (0.096 R)
• M63: 19,603,006 km (0.103 R)
• M64: 20,078,727 km (0.107 R)
• M65: 20,225,931 km (0.098 R)
• M66: 20,336,484 km (0.112 R)
• M67: 20,669,639 km (0.037 R)
• M68: 21,116,487 km (0.106 R)
• M69: 21,341,034 km (0.11 R)
• M70: 21,604,176 km (0.117 R)
• M71: 23,050,938 km (0.117 R)
• M72: 23,320,962 km (0.111 R)
• M73: 24,372,036 km (0.078 R)
• M74: 24,646,997 km (0.096 R)
• M75: 25,081,280 km (0.116 R)
• M76: 25,997,417 km (0.104 R)
• M77: 26,238,120 km (0.064 R)

Planet 7 - Gas Giant

Semi-Major Axis: 7.78 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 843.4

Radius: 10.4

Gravity: 7.8 G

Time & Orbit

Eccentricity (e): 0.121

Orbit Range: 6.84 AU - 8.72 AU

Year: 8007 Days

Day: 11.8 Hours

Environment

Temp: -157 °C

Axial Tilt: 5.3 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (83)

Outer Limit: 27,973,342 km

• M1: 180,265 km (0.093 R)
• M2: 293,511 km (0.111 R)
• M3: 418,575 km (0.084 R)
• M4: 778,507 km (0.064 R)
• M5: 912,547 km (0.082 R)
• M6: 1,262,756 km (0.109 R)
• M7: 1,484,310 km (0.079 R)
• M8: 1,589,328 km (0.08 R)
• M9: 1,718,730 km (0.112 R)
• M10: 1,988,305 km (0.065 R)
• M11: 2,057,868 km (0.038 R)
• M12: 2,618,711 km (0.106 R)
• M13: 2,772,647 km (0.104 R)
• M14: 3,170,727 km (0.052 R)
• M15: 3,672,329 km (0.086 R)
• M16: 4,349,558 km (0.112 R)
• M17: 4,624,968 km (0.088 R)
• M18: 4,811,816 km (0.03 R)
• M19: 5,420,080 km (0.061 R)
• M20: 5,917,493 km (0.103 R)
• M21: 6,086,539 km (0.049 R)
• M22: 6,778,878 km (0.069 R)
• M23: 6,920,248 km (0.107 R)
• M24: 7,098,569 km (0.117 R)
• M25: 7,350,641 km (0.117 R)
• M26: 8,578,540 km (0.116 R)
• M27: 8,885,814 km (0.085 R)
• M28: 8,963,156 km (0.051 R)
• M29: 9,829,029 km (0.062 R)
• M30: 9,949,306 km (0.079 R)
• M31: 10,721,679 km (0.109 R)
• M32: 11,555,388 km (0.048 R)
• M33: 11,894,826 km (0.057 R)
• M34: 13,506,743 km (0.032 R)
• M35: 13,685,213 km (0.118 R)
• M36: 14,270,290 km (0.1 R)
• M37: 14,634,412 km (0.076 R)
• M38: 15,001,525 km (0.089 R)
• M39: 15,792,000 km (0.085 R)
• M40: 15,979,895 km (0.1 R)
• M41: 18,243,460 km (0.073 R)
• M42: 18,638,698 km (0.076 R)
• M43: 19,236,790 km (0.076 R)
• M44: 19,337,170 km (0.085 R)
• M45: 20,298,636 km (0.116 R)
• M46: 20,605,461 km (0.058 R)
• M47: 20,811,009 km (0.079 R)
• M48: 21,535,361 km (0.116 R)
• M49: 22,005,398 km (0.112 R)
• M50: 22,373,409 km (0.114 R)
• M51: 24,243,532 km (0.072 R)
• M52: 25,060,336 km (0.062 R)
• M53: 25,389,601 km (0.115 R)
• M54: 26,052,320 km (0.103 R)
• M55: 26,888,871 km (0.115 R)
• M56: 27,057,168 km (0.111 R)
• M57: 28,473,860 km (0.079 R)
• M58: 31,260,569 km (0.106 R)
• M59: 31,496,784 km (0.12 R)
• M60: 31,911,470 km (0.079 R)
• M61: 34,437,280 km (0.064 R)
• M62: 34,803,346 km (0.053 R)
• M63: 34,925,568 km (0.117 R)
• M64: 35,170,609 km (0.12 R)
• M65: 35,662,487 km (0.039 R)
• M66: 35,909,174 km (0.067 R)
• M67: 36,342,409 km (0.079 R)
• M68: 37,213,966 km (0.082 R)
• M69: 37,777,950 km (0.118 R)
• M70: 38,218,516 km (0.043 R)
• M71: 38,344,627 km (0.088 R)
• M72: 38,914,296 km (0.057 R)
• M73: 39,550,386 km (0.082 R)
• M74: 39,678,142 km (0.069 R)
• M75: 39,997,833 km (0.105 R)
• M76: 40,318,421 km (0.119 R)
• M77: 40,768,561 km (0.043 R)
• M78: 41,609,152 km (0.061 R)
• M79: 42,390,202 km (0.066 R)
• M80: 42,520,801 km (0.061 R)
• M81: 42,716,924 km (0.039 R)
• M82: 43,176,040 km (0.072 R)
• M83: 43,373,210 km (0.041 R)

Planet 8 - Gas Giant

Semi-Major Axis: 8.62 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 651.8

Radius: 11.6

Gravity: 4.84 G

Time & Orbit

Eccentricity (e): 0.166

Orbit Range: 7.19 AU - 10.05 AU

Year: 9338 Days

Day: 14.2 Hours

Environment

Temp: -163 °C

Axial Tilt: 25.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (82)

Outer Limit: 27,973,342 km

• M1: 160,070 km (0.1 R)
• M2: 343,477 km (0.107 R)
• M3: 425,756 km (0.115 R)
• M4: 517,010 km (0.078 R)
• M5: 854,204 km (0.034 R)
• M6: 1,103,583 km (0.074 R)
• M7: 1,198,429 km (0.041 R)
• M8: 1,458,878 km (0.117 R)
• M9: 1,542,803 km (0.049 R)
• M10: 1,628,373 km (0.117 R)
• M11: 2,496,040 km (0.096 R)
• M12: 2,700,541 km (0.085 R)
• M13: 3,515,849 km (0.105 R)
• M14: 3,687,737 km (0.084 R)
• M15: 4,010,270 km (0.09 R)
• M16: 4,464,748 km (0.112 R)
• M17: 4,682,563 km (0.094 R)
• M18: 4,808,674 km (0.096 R)
• M19: 4,935,832 km (0.05 R)
• M20: 5,161,127 km (0.049 R)
• M21: 5,522,256 km (0.09 R)
• M22: 5,622,038 km (0.106 R)
• M23: 5,857,505 km (0.08 R)
• M24: 6,760,477 km (0.116 R)
• M25: 6,903,343 km (0.062 R)
• M26: 7,521,482 km (0.099 R)
• M27: 8,043,728 km (0.103 R)
• M28: 8,539,346 km (0.091 R)
• M29: 9,005,792 km (0.058 R)
• M30: 9,242,007 km (0.082 R)
• M31: 10,166,821 km (0.115 R)
• M32: 10,412,909 km (0.101 R)
• M33: 10,495,338 km (0.112 R)
• M34: 11,587,402 km (0.064 R)
• M35: 11,801,626 km (0.057 R)
• M36: 11,930,729 km (0.111 R)
• M37: 12,060,281 km (0.081 R)
• M38: 12,539,593 km (0.105 R)
• M39: 13,069,468 km (0.099 R)
• M40: 13,292,369 km (0.063 R)
• M41: 14,288,392 km (0.086 R)
• M42: 14,472,098 km (0.048 R)
• M43: 14,795,529 km (0.102 R)
• M44: 15,168,027 km (0.081 R)
• M45: 15,637,914 km (0.098 R)
• M46: 15,732,460 km (0.068 R)
• M47: 16,112,738 km (0.095 R)
• M48: 16,785,330 km (0.108 R)
• M49: 17,271,373 km (0.105 R)
• M50: 18,058,857 km (0.078 R)
• M51: 19,413,914 km (0.116 R)
• M52: 20,697,763 km (0.102 R)
• M53: 21,639,033 km (0.086 R)
• M54: 23,509,156 km (0.066 R)
• M55: 24,381,162 km (0.057 R)
• M56: 25,988,591 km (0.103 R)
• M57: 26,269,236 km (0.098 R)
• M58: 26,607,328 km (0.067 R)
• M59: 28,550,155 km (0.044 R)
• M60: 28,839,627 km (0.04 R)
• M61: 28,955,715 km (0.082 R)
• M62: 29,188,489 km (0.082 R)
• M63: 29,714,176 km (0.117 R)
• M64: 29,948,895 km (0.1 R)
• M65: 30,538,311 km (0.098 R)
• M66: 30,893,755 km (0.083 R)
• M67: 31,131,466 km (0.116 R)
• M68: 32,269,158 km (0.108 R)
• M69: 32,631,185 km (0.098 R)
• M70: 32,812,797 km (0.077 R)
• M71: 34,400,330 km (0.104 R)
• M72: 35,700,634 km (0.101 R)
• M73: 36,388,186 km (0.111 R)
• M74: 37,017,096 km (0.104 R)
• M75: 38,477,021 km (0.098 R)
• M76: 38,797,011 km (0.055 R)
• M77: 40,344,601 km (0.119 R)
• M78: 41,584,169 km (0.065 R)
• M79: 43,167,812 km (0.069 R)
• M80: 43,500,218 km (0.034 R)
• M81: 44,100,704 km (0.075 R)
• M82: 44,703,883 km (0.083 R)

Planet 9 - Gas Giant

Semi-Major Axis: 9.59 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 113.4

Radius: 12

Gravity: 0.79 G

Time & Orbit

Eccentricity (e): 0.183

Orbit Range: 7.84 AU - 11.34 AU

Year: 10957 Days

Day: 6.3 Hours

Environment

Temp: -168 °C

Axial Tilt: 5.5 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (77)

Outer Limit: 27,973,342 km

• M1: 233,971 km (0.118 R)
• M2: 488,736 km (0.062 R)
• M3: 675,584 km (0.053 R)
• M4: 1,136,794 km (0.099 R)
• M5: 1,393,654 km (0.073 R)
• M6: 1,544,748 km (0.108 R)
• M7: 1,638,097 km (0.106 R)
• M8: 1,765,704 km (0.093 R)
• M9: 1,913,357 km (0.052 R)
• M10: 1,997,132 km (0.082 R)
• M11: 2,186,223 km (0.073 R)
• M12: 2,582,059 km (0.119 R)
• M13: 3,079,323 km (0.091 R)
• M14: 3,198,402 km (0.078 R)
• M15: 3,441,200 km (0.101 R)
• M16: 4,074,597 km (0.078 R)
• M17: 4,183,654 km (0.107 R)
• M18: 5,044,889 km (0.041 R)
• M19: 5,471,841 km (0.104 R)
• M20: 5,763,108 km (0.093 R)
• M21: 6,184,226 km (0.064 R)
• M22: 6,386,034 km (0.071 R)
• M23: 6,462,179 km (0.04 R)
• M24: 6,692,710 km (0.028 R)
• M25: 6,821,962 km (0.103 R)
• M26: 6,899,903 km (0.107 R)
• M27: 7,135,519 km (0.12 R)
• M28: 7,267,614 km (0.116 R)
• M29: 7,373,829 km (0.079 R)
• M30: 7,776,845 km (0.062 R)
• M31: 8,187,192 km (0.119 R)
• M32: 8,604,570 km (0.107 R)
• M33: 8,773,466 km (0.1 R)
• M34: 9,402,226 km (0.063 R)
• M35: 9,663,723 km (0.086 R)
• M36: 10,075,267 km (0.088 R)
• M37: 10,342,748 km (0.076 R)
• M38: 10,763,716 km (0.103 R)
• M39: 10,915,409 km (0.071 R)
• M40: 11,405,641 km (0.063 R)
• M41: 11,560,325 km (0.06 R)
• M42: 11,747,023 km (0.111 R)
• M43: 12,407,797 km (0.075 R)
• M44: 13,437,928 km (0.099 R)
• M45: 13,732,636 km (0.105 R)
• M46: 14,528,945 km (0.07 R)
• M47: 14,898,901 km (0.039 R)
• M48: 15,785,867 km (0.068 R)
• M49: 15,992,910 km (0.104 R)
• M50: 16,270,414 km (0.114 R)
• M51: 16,549,564 km (0.051 R)
• M52: 17,610,512 km (0.08 R)
• M53: 17,789,580 km (0.074 R)
• M54: 18,041,054 km (0.084 R)
• M55: 18,149,214 km (0.1 R)
• M56: 18,402,483 km (0.082 R)
• M57: 18,912,612 km (0.094 R)
• M58: 19,797,782 km (0.085 R)
• M59: 19,946,632 km (0.027 R)
• M60: 20,170,580 km (0.084 R)
• M61: 20,809,812 km (0.082 R)
• M62: 21,036,901 km (0.037 R)
• M63: 21,265,038 km (0.114 R)
• M64: 21,685,109 km (0.077 R)
• M65: 22,069,426 km (0.049 R)
• M66: 22,455,987 km (0.035 R)
• M67: 22,689,060 km (0.045 R)
• M68: 23,235,990 km (0.085 R)
• M69: 24,462,393 km (0.062 R)
• M70: 24,622,164 km (0.117 R)
• M71: 24,942,752 km (0.12 R)
• M72: 25,305,078 km (0.117 R)
• M73: 25,750,281 km (0.107 R)
• M74: 26,157,337 km (0.069 R)
• M75: 27,184,177 km (0.104 R)
• M76: 27,349,632 km (0.112 R)
• M77: 27,848,242 km (0.078 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: 379 - 10,978 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit