🌌 Stone's Star System Generator

Planet 1 - Terrestrial

Semi-Major Axis: 0.74 AU

Status: Inner (Hot)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.33

Radius: 1.62

Gravity: 1.27 G

Time & Orbit

Eccentricity (e): 0.195

Orbit Range: 0.6 AU - 0.88 AU

Year: 237 Days

Day: 26.3 Hours

Environment

Temp: 188 °C

Axial Tilt: 34.3 °

Atmosphere: Dense CO₂

Biome: Volcanic/Barren

Satellites (2)

Outer Limit: 85,994,375 km

• M1: 417,976 km (0.045 R)
• M2: 569,968 km (0.038 R)

Planet 2 - Terrestrial

Semi-Major Axis: 1.69 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 2.35

Radius: 1.41

Gravity: 1.18 G

Time & Orbit

Eccentricity (e): 0.005

Orbit Range: 1.68 AU - 1.7 AU

Year: 819 Days

Day: 22.9 Hours

Environment

Temp: -63 °C

Axial Tilt: 7.2 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Planet 3 - Terrestrial

Semi-Major Axis: 1.86 AU

Status: Outer (Cold)

Composition: Rocky (Silicates/Metals)

Physical Data

Mass: 3.68

Radius: 1.68

Gravity: 1.3 G

Time & Orbit

Eccentricity (e): 0.074

Orbit Range: 1.72 AU - 2 AU

Year: 946 Days

Day: 37.1 Hours

Environment

Temp: -71 °C

Axial Tilt: 32.7 °

Atmosphere: Thin N₂/CH₄

Biome: Ice Cap/Desert

Satellites (1)

Outer Limit: 85,994,375 km

• M1: 1,428,510 km (0.054 R)

Planet 4 - Gas Giant

Semi-Major Axis: 5.16 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 407.2

Radius: 8.6

Gravity: 5.51 G

Time & Orbit

Eccentricity (e): 0.068

Orbit Range: 4.81 AU - 5.51 AU

Year: 4369 Days

Day: 5.3 Hours

Environment

Temp: -138 °C

Axial Tilt: 35.4 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (84)

Outer Limit: 85,994,375 km

• M1: 117,734 km (0.096 R)
• M2: 172,337 km (0.109 R)
• M3: 298,747 km (0.057 R)
• M4: 543,938 km (0.093 R)
• M5: 720,314 km (0.113 R)
• M6: 826,528 km (0.051 R)
• M7: 1,091,316 km (0.099 R)
• M8: 1,152,502 km (0.043 R)
• M9: 1,240,017 km (0.044 R)
• M10: 1,449,005 km (0.117 R)
• M11: 1,783,655 km (0.105 R)
• M12: 2,157,650 km (0.12 R)
• M13: 2,329,987 km (0.089 R)
• M14: 2,655,063 km (0.092 R)
• M15: 2,738,539 km (0.07 R)
• M16: 3,258,242 km (0.105 R)
• M17: 3,492,961 km (0.101 R)
• M18: 3,751,915 km (0.089 R)
• M19: 3,864,861 km (0.087 R)
• M20: 4,017,152 km (0.094 R)
• M21: 4,132,791 km (0.101 R)
• M22: 4,249,477 km (0.089 R)
• M23: 4,347,464 km (0.073 R)
• M24: 4,486,141 km (0.085 R)
• M25: 4,951,839 km (0.109 R)
• M26: 5,200,920 km (0.102 R)
• M27: 5,754,880 km (0.117 R)
• M28: 6,016,826 km (0.098 R)
• M29: 6,282,662 km (0.1 R)
• M30: 6,575,126 km (0.053 R)
• M31: 7,103,505 km (0.099 R)
• M32: 7,267,016 km (0.065 R)
• M33: 7,360,963 km (0.105 R)
• M34: 7,981,944 km (0.085 R)
• M35: 8,969,739 km (0.109 R)
• M36: 9,045,435 km (0.056 R)
• M37: 9,222,709 km (0.083 R)
• M38: 10,126,579 km (0.06 R)
• M39: 10,310,734 km (0.047 R)
• M40: 10,390,021 km (0.093 R)
• M41: 10,869,931 km (0.064 R)
• M42: 11,058,424 km (0.115 R)
• M43: 11,112,579 km (0.119 R)
• M44: 11,520,981 km (0.103 R)
• M45: 11,906,644 km (0.075 R)
• M46: 11,962,145 km (0.094 R)
• M47: 12,662,413 km (0.107 R)
• M48: 12,718,961 km (0.115 R)
• M49: 12,803,932 km (0.11 R)
• M50: 12,889,203 km (0.096 R)
• M51: 12,946,200 km (0.118 R)
• M52: 13,117,489 km (0.072 R)
• M53: 13,318,399 km (0.045 R)
• M54: 13,462,462 km (0.076 R)
• M55: 13,694,039 km (0.088 R)
• M56: 14,161,084 km (0.096 R)
• M57: 14,337,610 km (0.091 R)
• M58: 14,426,171 km (0.099 R)
• M59: 14,544,503 km (0.051 R)
• M60: 14,752,444 km (0.08 R)
• M61: 15,021,122 km (0.072 R)
• M62: 15,171,169 km (0.114 R)
• M63: 15,472,609 km (0.049 R)
• M64: 15,563,414 km (0.079 R)
• M65: 15,624,151 km (0.117 R)
• M66: 15,684,888 km (0.085 R)
• M67: 15,745,625 km (0.089 R)
• M68: 16,543,281 km (0.077 R)
• M69: 17,103,375 km (0.113 R)
• M70: 17,448,497 km (0.066 R)
• M71: 17,637,888 km (0.105 R)
• M72: 17,764,448 km (0.112 R)
• M73: 18,177,936 km (0.031 R)
• M74: 18,723,370 km (0.062 R)
• M75: 19,306,802 km (0.05 R)
• M76: 19,502,626 km (0.035 R)
• M77: 19,568,000 km (0.096 R)
• M78: 19,896,218 km (0.09 R)
• M79: 20,259,292 km (0.115 R)
• M80: 20,891,642 km (0.109 R)
• M81: 22,141,532 km (0.04 R)
• M82: 22,278,115 km (0.112 R)
• M83: 22,483,513 km (0.091 R)
• M84: 23,138,003 km (0.102 R)

Planet 5 - Gas Giant

Semi-Major Axis: 7.07 AU

Status: Outer (Cold)

Composition: Hydrogen/Helium Atmosphere

Physical Data

Mass: 13.9

Radius: 13.9

Gravity: 0.07 G

Time & Orbit

Eccentricity (e): 0.183

Orbit Range: 5.78 AU - 8.36 AU

Year: 7008 Days

Day: 6 Hours

Environment

Temp: -156 °C

Axial Tilt: 4.7 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (35)

Outer Limit: 85,994,375 km

• M1: 173,234 km (0.088 R)
• M2: 314,455 km (0.085 R)
• M3: 465,100 km (0.089 R)
• M4: 568,322 km (0.108 R)
• M5: 692,788 km (0.074 R)
• M6: 1,494,184 km (0.096 R)
• M7: 1,587,832 km (0.052 R)
• M8: 1,814,473 km (0.043 R)
• M9: 1,931,907 km (0.116 R)
• M10: 2,060,711 km (0.077 R)
• M11: 2,192,357 km (0.075 R)
• M12: 2,586,248 km (0.087 R)
• M13: 2,894,120 km (0.096 R)
• M14: 3,214,110 km (0.107 R)
• M15: 3,316,435 km (0.112 R)
• M16: 3,461,695 km (0.076 R)
• M17: 3,577,334 km (0.071 R)
• M18: 3,975,863 km (0.098 R)
• M19: 4,839,342 km (0.117 R)
• M20: 5,660,335 km (0.04 R)
• M21: 5,834,915 km (0.059 R)
• M22: 5,985,860 km (0.09 R)
• M23: 6,368,980 km (0.12 R)
• M24: 6,602,801 km (0.078 R)
• M25: 6,826,300 km (0.099 R)
• M26: 7,199,846 km (0.056 R)
• M27: 7,511,758 km (0.085 R)
• M28: 7,648,640 km (0.104 R)
• M29: 8,176,870 km (0.08 R)
• M30: 8,445,548 km (0.06 R)
• M31: 8,717,068 km (0.071 R)
• M32: 8,832,258 km (0.065 R)
• M33: 9,020,602 km (0.112 R)
• M34: 9,682,722 km (0.102 R)
• M35: 9,861,940 km (0.092 R)

Asteroid Belt

Center: 9.99 AU

Composition

Type: Outer System (Icy)

A dense region of planetesimals and debris.

Boundary

Planet 6 - Ice Giant

Semi-Major Axis: 12.9 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 360.2

Radius: 7.8

Gravity: 5.92 G

Time & Orbit

Eccentricity (e): 0.237

Orbit Range: 9.84 AU - 15.96 AU

Year: 17272 Days

Day: 17.3 Hours

Environment

Temp: -180 °C

Axial Tilt: 34.2 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (94)

Outer Limit: 85,994,375 km

• M1: 122,820 km (0.108 R)
• M2: 853,605 km (0.1 R)
• M3: 934,687 km (0.116 R)
• M4: 1,126,622 km (0.068 R)
• M5: 1,284,896 km (0.03 R)
• M6: 1,378,694 km (0.081 R)
• M7: 1,523,654 km (0.071 R)
• M8: 1,573,171 km (0.088 R)
• M9: 2,070,285 km (0.106 R)
• M10: 2,208,962 km (0.042 R)
• M11: 2,466,121 km (0.11 R)
• M12: 2,613,325 km (0.106 R)
• M13: 2,702,934 km (0.106 R)
• M14: 2,763,372 km (0.066 R)
• M15: 2,916,261 km (0.101 R)
• M16: 3,262,580 km (0.064 R)
• M17: 3,359,220 km (0.112 R)
• M18: 3,755,804 km (0.108 R)
• M19: 4,237,060 km (0.073 R)
• M20: 4,958,272 km (0.05 R)
• M21: 5,257,468 km (0.088 R)
• M22: 5,755,928 km (0.108 R)
• M23: 5,834,018 km (0.093 R)
• M24: 6,070,382 km (0.099 R)
• M25: 6,229,555 km (0.07 R)
• M26: 6,309,739 km (0.066 R)
• M27: 7,767,421 km (0.063 R)
• M28: 9,186,955 km (0.094 R)
• M29: 9,324,136 km (0.106 R)
• M30: 10,303,105 km (0.096 R)
• M31: 10,493,243 km (0.117 R)
• M32: 10,732,600 km (0.1 R)
• M33: 11,956,161 km (0.101 R)
• M34: 12,609,904 km (0.058 R)
• M35: 12,711,481 km (0.115 R)
• M36: 12,864,370 km (0.098 R)
• M37: 13,690,150 km (0.057 R)
• M38: 14,906,979 km (0.114 R)
• M39: 15,938,157 km (0.115 R)
• M40: 17,216,920 km (0.108 R)
• M41: 18,528,295 km (0.064 R)
• M42: 18,817,617 km (0.065 R)
• M43: 19,342,257 km (0.099 R)
• M44: 21,246,189 km (0.115 R)
• M45: 21,367,064 km (0.106 R)
• M46: 21,975,329 km (0.088 R)
• M47: 23,333,528 km (0.103 R)
• M48: 24,338,227 km (0.118 R)
• M49: 24,909,691 km (0.09 R)
• M50: 25,485,344 km (0.092 R)
• M51: 25,807,129 km (0.107 R)
• M52: 26,259,961 km (0.091 R)
• M53: 26,389,812 km (0.119 R)
• M54: 27,238,930 km (0.088 R)
• M55: 28,229,866 km (0.109 R)
• M56: 28,496,150 km (0.054 R)
• M57: 29,098,282 km (0.112 R)
• M58: 30,724,261 km (0.101 R)
• M59: 30,792,627 km (0.049 R)
• M60: 31,893,668 km (0.118 R)
• M61: 32,171,022 km (0.072 R)
• M62: 33,428,691 km (0.108 R)
• M63: 35,919,945 km (0.115 R)
• M64: 37,005,876 km (0.1 R)
• M65: 37,078,580 km (0.079 R)
• M66: 37,151,434 km (0.088 R)
• M67: 37,370,146 km (0.097 R)
• M68: 37,662,610 km (0.095 R)
• M69: 38,913,398 km (0.073 R)
• M70: 38,987,449 km (0.051 R)
• M71: 39,209,752 km (0.092 R)
• M72: 41,153,925 km (0.116 R)
• M73: 41,380,267 km (0.055 R)
• M74: 42,976,327 km (0.099 R)
• M75: 45,213,264 km (0.103 R)
• M76: 45,680,757 km (0.116 R)
• M77: 45,993,267 km (0.109 R)
• M78: 47,329,625 km (0.12 R)
• M79: 47,804,299 km (0.067 R)
• M80: 47,883,586 km (0.099 R)
• M81: 48,997,940 km (0.026 R)
• M82: 49,398,114 km (0.082 R)
• M83: 50,120,822 km (0.078 R)
• M84: 50,847,269 km (0.088 R)
• M85: 51,495,776 km (0.072 R)
• M86: 51,658,389 km (0.084 R)
• M87: 52,392,017 km (0.119 R)
• M88: 52,555,527 km (0.118 R)
• M89: 52,637,357 km (0.05 R)
• M90: 52,882,997 km (0.063 R)
• M91: 53,047,106 km (0.115 R)
• M92: 53,457,902 km (0.066 R)
• M93: 54,117,329 km (0.101 R)
• M94: 55,361,086 km (0.112 R)

Planet 7 - Ice Giant

Semi-Major Axis: 14.09 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 558.1

Radius: 3.9

Gravity: 36.69 G

Time & Orbit

Eccentricity (e): 0.019

Orbit Range: 13.82 AU - 14.36 AU

Year: 19716 Days

Day: 18 Hours

Environment

Temp: -196 °C

Axial Tilt: 18.8 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 85,994,375 km

• M1: 152,739 km (0.086 R)
• M2: 247,435 km (0.09 R)
• M3: 378,034 km (0.115 R)
• M4: 697,724 km (0.112 R)
• M5: 765,193 km (0.092 R)
• M6: 1,323,492 km (0.071 R)
• M7: 1,407,566 km (0.117 R)
• M8: 1,435,990 km (0.118 R)
• M9: 1,730,548 km (0.064 R)
• M10: 1,761,066 km (0.032 R)
• M11: 2,476,144 km (0.065 R)
• M12: 2,579,965 km (0.099 R)
• M13: 3,576,586 km (0.054 R)
• M14: 4,176,025 km (0.115 R)
• M15: 4,258,303 km (0.054 R)
• M16: 4,299,592 km (0.112 R)
• M17: 5,154,095 km (0.107 R)
• M18: 5,510,288 km (0.111 R)
• M19: 5,920,336 km (0.093 R)
• M20: 6,246,010 km (0.071 R)
• M21: 8,894,192 km (0.097 R)
• M22: 9,374,251 km (0.044 R)
• M23: 10,582,553 km (0.036 R)
• M24: 11,376,619 km (0.098 R)
• M25: 11,434,064 km (0.105 R)
• M26: 11,722,788 km (0.095 R)
• M27: 12,307,417 km (0.109 R)
• M28: 12,484,690 km (0.12 R)
• M29: 12,662,861 km (0.077 R)
• M30: 12,781,941 km (0.118 R)
• M31: 13,687,756 km (0.083 R)
• M32: 13,871,313 km (0.106 R)
• M33: 14,551,534 km (0.041 R)
• M34: 14,801,662 km (0.075 R)
• M35: 15,624,002 km (0.087 R)
• M36: 15,687,880 km (0.092 R)
• M37: 16,396,375 km (0.105 R)
• M38: 16,852,499 km (0.057 R)
• M39: 18,380,642 km (0.103 R)
• M40: 18,718,583 km (0.065 R)
• M41: 19,883,203 km (0.089 R)
• M42: 20,160,557 km (0.108 R)
• M43: 20,439,258 km (0.047 R)
• M44: 20,859,628 km (0.096 R)
• M45: 21,141,470 km (0.093 R)
• M46: 22,066,284 km (0.092 R)
• M47: 22,353,512 km (0.092 R)
• M48: 22,497,575 km (0.114 R)
• M49: 22,859,003 km (0.119 R)
• M50: 22,931,558 km (0.089 R)
• M51: 23,076,818 km (0.084 R)
• M52: 24,102,461 km (0.104 R)
• M53: 24,472,267 km (0.056 R)
• M54: 24,620,668 km (0.086 R)
• M55: 24,695,018 km (0.084 R)
• M56: 25,593,054 km (0.096 R)
• M57: 26,425,566 km (0.073 R)
• M58: 27,036,674 km (0.111 R)
• M59: 27,498,033 km (0.114 R)
• M60: 27,729,611 km (0.077 R)
• M61: 28,897,521 km (0.106 R)
• M62: 29,290,365 km (0.091 R)
• M63: 29,922,566 km (0.119 R)
• M64: 32,577,779 km (0.081 R)
• M65: 32,986,630 km (0.04 R)
• M66: 36,148,680 km (0.105 R)
• M67: 36,741,536 km (0.101 R)
• M68: 39,580,006 km (0.03 R)
• M69: 40,541,621 km (0.047 R)
• M70: 40,805,213 km (0.095 R)
• M71: 42,220,708 km (0.1 R)
• M72: 44,373,870 km (0.103 R)
• M73: 45,463,840 km (0.119 R)
• M74: 46,012,116 km (0.096 R)
• M75: 47,762,711 km (0.095 R)
• M76: 48,320,112 km (0.104 R)
• M77: 48,506,362 km (0.113 R)
• M78: 49,347,401 km (0.116 R)
• M79: 49,722,742 km (0.048 R)
• M80: 51,994,834 km (0.094 R)
• M81: 52,568,093 km (0.113 R)
• M82: 53,913,876 km (0.078 R)
• M83: 55,173,789 km (0.102 R)
• M84: 55,856,105 km (0.117 R)
• M85: 56,345,140 km (0.037 R)
• M86: 56,639,399 km (0.108 R)
• M87: 59,010,825 km (0.082 R)
• M88: 59,708,549 km (0.062 R)
• M89: 61,313,734 km (0.12 R)
• M90: 62,121,713 km (0.117 R)
• M91: 64,463,817 km (0.095 R)
• M92: 66,627,600 km (0.119 R)
• M93: 67,042,435 km (0.098 R)
• M94: 67,562,138 km (0.105 R)
• M95: 68,501,015 km (0.085 R)
• M96: 69,339,211 km (0.094 R)

Planet 8 - Ice Giant

Semi-Major Axis: 17.82 AU

Status: Outer (Cold)

Composition: Methane/Ammonia Ices

Physical Data

Mass: 503

Radius: 6.1

Gravity: 13.52 G

Time & Orbit

Eccentricity (e): 0.25

Orbit Range: 13.37 AU - 22.28 AU

Year: 28042 Days

Day: 15.6 Hours

Environment

Temp: -201 °C

Axial Tilt: 11.1 °

Atmosphere: H₂, CH₄

Biome: None

Satellites (96)

Outer Limit: 85,994,375 km

• M1: 161,715 km (0.1 R)
• M2: 436,078 km (0.093 R)
• M3: 522,246 km (0.079 R)
• M4: 841,937 km (0.119 R)
• M5: 1,735,784 km (0.119 R)
• M6: 2,512,646 km (0.12 R)
• M7: 2,833,683 km (0.118 R)
• M8: 3,083,063 km (0.108 R)
• M9: 3,827,462 km (0.118 R)
• M10: 4,056,645 km (0.113 R)
• M11: 4,819,744 km (0.101 R)
• M12: 5,217,824 km (0.097 R)
• M13: 5,730,047 km (0.098 R)
• M14: 5,834,467 km (0.096 R)
• M15: 6,801,916 km (0.118 R)
• M16: 7,023,620 km (0.107 R)
• M17: 8,050,609 km (0.105 R)
• M18: 8,226,387 km (0.114 R)
• M19: 9,002,201 km (0.119 R)
• M20: 9,123,675 km (0.089 R)
• M21: 9,245,747 km (0.099 R)
• M22: 10,051,780 km (0.109 R)
• M23: 10,431,310 km (0.107 R)
• M24: 11,862,962 km (0.083 R)
• M25: 12,533,908 km (0.072 R)
• M26: 12,601,676 km (0.106 R)
• M27: 12,737,660 km (0.117 R)
• M28: 13,632,854 km (0.075 R)
• M29: 13,982,464 km (0.112 R)
• M30: 14,123,236 km (0.066 R)
• M31: 14,619,302 km (0.074 R)
• M32: 14,762,168 km (0.106 R)
• M33: 15,483,230 km (0.088 R)
• M34: 16,289,563 km (0.095 R)
• M35: 16,511,715 km (0.036 R)
• M36: 17,109,359 km (0.058 R)
• M37: 17,638,187 km (0.05 R)
• M38: 18,557,017 km (0.054 R)
• M39: 18,789,193 km (0.104 R)
• M40: 19,885,147 km (0.078 R)
• M41: 20,680,559 km (0.106 R)
• M42: 21,730,288 km (0.066 R)
• M43: 23,128,878 km (0.088 R)
• M44: 24,217,801 km (0.07 R)
• M45: 25,409,198 km (0.104 R)
• M46: 32,852,590 km (0.116 R)
• M47: 33,414,928 km (0.09 R)
• M48: 33,886,162 km (0.056 R)
• M49: 34,075,104 km (0.108 R)
• M50: 34,169,799 km (0.097 R)
• M51: 35,121,242 km (0.044 R)
• M52: 35,888,679 km (0.103 R)
• M53: 36,081,361 km (0.058 R)
• M54: 36,274,342 km (0.097 R)
• M55: 36,371,132 km (0.099 R)
• M56: 36,855,679 km (0.119 R)
• M57: 38,027,330 km (0.098 R)
• M58: 38,815,262 km (0.078 R)
• M59: 39,112,064 km (0.083 R)
• M60: 41,110,243 km (0.062 R)
• M61: 43,448,906 km (0.08 R)
• M62: 44,997,244 km (0.081 R)
• M63: 45,309,156 km (0.098 R)
• M64: 45,413,276 km (0.095 R)
• M65: 46,563,684 km (0.075 R)
• M66: 47,511,985 km (0.071 R)
• M67: 50,071,903 km (0.069 R)
• M68: 50,610,904 km (0.052 R)
• M69: 50,718,914 km (0.091 R)
• M70: 50,826,924 km (0.084 R)
• M71: 51,912,107 km (0.106 R)
• M72: 53,774,451 km (0.026 R)
• M73: 55,324,434 km (0.037 R)
• M74: 57,338,769 km (0.114 R)
• M75: 57,451,417 km (0.099 R)
• M76: 57,564,064 km (0.084 R)
• M77: 58,468,233 km (0.052 R)
• M78: 63,524,193 km (0.103 R)
• M79: 64,341,296 km (0.112 R)
• M80: 65,279,424 km (0.115 R)
• M81: 66,458,555 km (0.076 R)
• M82: 67,644,716 km (0.064 R)
• M83: 68,001,806 km (0.085 R)
• M84: 68,718,081 km (0.088 R)
• M85: 70,278,536 km (0.066 R)
• M86: 71,002,740 km (0.104 R)
• M87: 71,365,664 km (0.057 R)
• M88: 71,972,134 km (0.03 R)
• M89: 73,801,417 km (0.12 R)
• M90: 74,291,948 km (0.03 R)
• M91: 74,414,618 km (0.107 R)
• M92: 75,152,734 km (0.031 R)
• M93: 75,399,272 km (0.103 R)
• M94: 76,264,396 km (0.054 R)
• M95: 77,381,443 km (0.06 R)
• M96: 79,757,357 km (0.118 R)

Kuiper Belt

Range: 30 - 47 AU

Composition

Type: Dwarf Planets/TNOs (Ices)

Reservoir of dwarf planets and volatile ices.

Outer System

Oort Cloud

Range: 290 - 11,254 AU

Composition

Type: Cometary Reservoir

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

Gravitational Limit