Hubble Captures Best Ever Image of Triangulum Galaxy | Astronomy

Sharpest View Ever of the Triangulum Galaxy

Sharpest View Ever of the Triangulum Galaxy

In a new composite image made up of many individual photos, Hubble shows us the nearby Triangulum galaxy in incredible detail. The image is comprised of 665 million pixels and was created from 54 different images, a view in space so large that it spans "an area more than 19,000 light-years across".

Study author Julianne Dalcanton of the University of Washington in Seattle, said, 'My first impression on seeing the Hubble images was, wow, that really is a lot of star formation.

Under excellent dark-sky conditions, this galaxy can be seen with the naked eye as a faint, blurry object in the constellation of Triangulum, where its ethereal glow is an exciting target for amateur astronomers. But just a little farther - okay, 500,000 light-years farther - is another spiral galaxy, the third largest in our local group.

It measures only about 60,000 light-years across, compared to the 200,000 light-years of the Andromeda Galaxy; the Milky Way lies between these extremes at about 100,000 light-years in diameter.

The full image contains nearly 25 million stars, and will help scientists study not just the Triangulum Galaxy, but Andromeda and our own. But in 2014, Weisz published a paper with measurements of the star-formation histories of 40 dwarf galaxies in the Local Group, all using the same analysis technique on existing Hubble data.

In contrast to the two larger spiral galaxies, Triangulum does not have a bright bulge at its centre - and it also lacks a bar connecting its spiral arms to the centre. Astronomers hope that the new image, along with previous surveys taken of the Andromeda and Milky Way galaxies, will help them gain a deeper understanding of stellar evolution in the Local Group and beyond.

It also has at least an order of magnitude less stars than the Milky Way and two orders of magnitude less than Andromeda.

Most notably, Triangulum's star formation is 10 times more intense than in the comparable Hubble panorama of the neighboring Andromeda.