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It is one of the three stars of the Summer Triangle, along with Vega and Deneb. [6] [7] [8] It is an A-type main-sequence star with 1.8 times the mass of the Sun and 11 times its luminosity. [9] [10] The star rotates quickly, and this gives the star an oblate shape where it is flattened towards the poles. [9] [10] [11]
This is comparable to the mean magnetic field on the Sun. [73] Magnetic fields of roughly 30 G have been reported for Vega, compared to about 1 G for the Sun. [58] In 2015, bright starspots were detected on the star's surface—the first such detection for a normal A-type star, and these features show evidence of rotational modulation with a ...
The Summer Triangle in the context of the night sky, with dimmer stars fading out first and then fading in last. From mid-to-tropical northern latitudes: the centre of the triangle appears about overhead around solar midnight during summer, and exactly so at about the 27th parallel north. This means it rises at sunset in the east and sets at ...
Meteor showers will be few and far between during the first half of 2025, but two will peak in the spring sky. The Lyrids will unfold first on the night of Monday, April 21, into Tuesday, April 22 ...
The Sun would appear as a white star of apparent magnitude +0.5, [136] roughly the same as the average brightness of Betelgeuse from Earth. It would be at the antipodal point of α Centauri AB's current right ascension and declination , at 02 h 39 m 36 s +60° 50′ 02.308″ (2000), in eastern Cassiopeia , easily outshining all the rest of the ...
The ancient Greeks observed that the appearance of Sirius as the morning star heralded the hot and dry summer and feared that the star caused plants to wilt, men to weaken, and women to become aroused. [30] Owing to its brightness, Sirius would have been seen to twinkle more in the unsettled weather conditions of early summer. To Greek ...
Image credits: Detroit Photograph Company "There was a two-color process invented around 1913 by Kodak that used two glass plates in contact with each other, one being red-orange and the other ...
Average distance of Earth's orbit from the Sun (sunlight travels for 8 minutes and 19 seconds before reaching Earth) — Mars: 1.52 — Average distance from the Sun — Jupiter: 5.2 — Average distance from the Sun — Light-hour: 7.2 — Distance light travels in one hour — Saturn: 9.5 — Average distance from the Sun — Uranus: 19.2 ...