These are 5 of the most different stars ever discovered by astronomers.

1 - Methuselah

With a nickname like that you can already deduce that it is a very old star, right? Methuselah is officially known as HD 140283, and refers to a star representing an astronomical dilemma. That's because, using the techniques scientists typically employ to date the age of stars they find in the cosmos, they came to the conclusion that Methuselah could be 14.5 billion years old - with a margin of error of about 0, 8 billion years - which could make it an "older" object than the universe itself, which has been estimated at 13.8 billion years.

Methuselah Star HD 140283

(Wikimedia Commons / ESA / Hubble)

2 - Thorne – Zytkow Object

A “Thorne – Zytkow Object” would be a star proposed by scientists Kip Thorne and Anna Zytkow over 40 years ago, and consists of a star composed of a giant or red supergiant containing a neutron star as its nucleus. This curious object would form, according to its proponents, after the collision of the two star bodies, and in 2014 astronomers identified HV 2112, a strong Thorne – Zytkow Object candidate.

Thorne Zytkow Object

(Ars Technica / NASA)

3 - UY Scuti

UY Scuti is among the largest stars ever observed by astronomers and, not surprisingly, has been classified as a red supergiant. Although not the most massive - this title currently belongs to R136a1, which is 265 times more massive than our Sun - with 30 times the mass of our Astro-King, UY Scuti has a radius of 1.7 thousand times greater. to that of our star.

UY Scuti massive star

(Wikimedia Commons / Philip Park)

4 - 2MASS J0523-1403

And since we talk about one of the biggest stars ever discovered by astronomers in the previous item, how about knowing a little about the smallest? Called 2MASS J0523-1403, it is about 40 light years away from us and consists of an extremely low-mass red dwarf about the size of the planet Saturn. But what's more interesting about this star is that the smaller these stars are, the longer they "live" - ​​and it is estimated that this star will remain active for at least 12 trillion years!

Smallest star discovered

(Scientific American / Cerro Tololo Inter-American Observatory 0.9-meter Telescope / Sergio Dieterich)

5 - SAO 206462

Star with arms

(Space.com/NAOJ/Subaru)

Everyone is used to seeing spiral-arm galaxies, such as the Milky Way, our address in the cosmos, but what about stars? Astronomers discovered one of these curious stars about 460 light years away from Earth in the constellation Lupus. Called SAO 206462, the star has arms measuring more than 22 billion kilometers in diameter and scientists believe they are actually protoplanetary disks where new planets occur.