70 Interesting Facts About Sun

Last updated on April 5th, 2019

46. Sun spots have a very strong magnet field, which prevents the convection of energy, and thus accounts for their lower temperatures.[20]

47. In fact, the sun is about 400 times larger than the moon.[21]

48. A typical sunspot consists of a dark spot in the middle called the umbra, and a lighter region known as the penumbra.[26]

49. The solar maximum is a period of time during the solar cycle when the number of sunspots is at its highest.[26]

50. Sunspot cycles are repeated every 11 years, and coincide with the occurrence of solar flares.[26]

51. When the solar cycle is at a minimum, flares are rare because active regions are far between.[26]

Sun’s movement

52. It travels at 20 kilometers per second relative to other stars, and 220 kilometers per second around the Milky Way.[46]

53. Different parts of the sun rotate at different speeds, the fastest being at its equator.[47]

54. The sun’s rotation period at the equator is about 27 days while that at the poles is about 36 days.[48]

55. It completes a revolution around the entire galaxy once every 250 million years.[6]

Facts about its composition

56. The sun is a ball of gas and has no solid surface.[1]

57. Its composition is 91% Hydrogen, 7.8% Helium, and 1% other gases.[2]

58. Helium is the second most abundant element both in the sun and in the universe, but very hard to find on earth.[3]

59. It contains different layers with varying temperatures; the corona, photosphere, chromosphere, and the core.[12]

60. The chromosphere contains spikes of gas called spicules.[13]

61. It is visible as a flash of color at the starting and ending of total solar eclipses.[28]

62. The photosphere is the opaque layer of gas that makes the sun appear to be solid.[29]

63. It’s also responsible for emitting light, and is cooler than the outer most layer, the corona.[30]

64. The transition region is a very narrow (60 miles / 100 km) layer between the chromosphere and the corona where the temperature rises abruptly from about 8000 to about 500,000 K.[31]

65. The corona releases a stream of charged particles referred to as solar wind.[55]

Interesting facts about evolution and life cycle of the Sun

66. The sun is currently in its yellow dwarf stage.[56]

67. It has enough nuclear fuel to stay as it is for 5 billion more years.[53]

68. When its energy (hydrogen) burns out, it will expand into the red giant and consume nearby planets, possibly even earth.[57]

69. Its outer layers will then collapse, and it will become the white dwarf.[53]

70. In the end, it will become a dim and cool celestial body referred to as the black dwarf.[53]