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Polaris

Hanoi, 2024/10/25, 02:26

These photos were captured by iPhone 12 Pro

The North Star, also known as Polaris, is one of the most famous and significant stars in the night sky. Located in the constellation Ursa Minor (the Little Bear), it is the brightest star in this constellation and serves as a key celestial landmark for navigation.

Polaris is almost perfectly aligned with Earth's rotational axis, making it appear nearly stationary in the sky while other stars seem to rotate around it. This unique position has earned it the title of the "North Star" or "Pole Star." For centuries, it has been an essential guide for travelers, sailors, and explorers, especially before modern navigation tools were invented.

Arcturus and its nearby objects

Hanoi, 2024/05/11, 23:51

These photos were captured by D102f640

Arcturus, the fourth brightest star in the night sky, and the brightest star in the northern constellation Boötis, with an apparent visual magnitude of −0.05. It is an orange-coloured giant star 36.7 light-years from Earth (Britannica)

The enormous size of Arcturus

Spica

Hanoi, 2024/02/12, 23:03

This photo was captured by iPhone 12 Pro

Spica stands out as the most luminous star within the Virgo constellation and ranks as the 15th brightest celestial body visible at night. Positioned at a distance of 260 light years from our planet, this stellar entity, classified as a blue giant, exhibits variability characteristic of the Beta Cephei type.