How many spiral galaxy are there?
There are currently 3 classifications of classical spiral galaxies and another 3 for barred spiral galaxies: 1. Spiral galaxy type A – abbreviation Sa – they have a big central bulge and smooth, broad spiral arms. Around 2% of the mass of Sa spiral galaxies is present in the form of gas and dust.
How rare is a spiral galaxy?
Together with irregular galaxies, spiral galaxies make up approximately 60% of galaxies in today's universe. They are mostly found in low-density regions and are rare in the centers of galaxy clusters.
What is the oldest spiral galaxy?
Galaxy BRI 1335-0417 The galaxy dates back to 12.4 billion years ago and it bears a family resemblance to our own Milky Way. Galaxy BRI 1335-0417 is the oldest known spiral galaxy ever discovered. This ALMA image shows the spiral arms emanating from the center.
What is the largest spiral galaxy known?
The largest spiral galaxy in the local universe could well earn the nickname “Godzilla Galaxy,” astronomers say, thanks to its truly gargantuan size. The galaxy, UGC 2885, is 2.5 times wider than the Milky way and hosts a trillion stars, 10 times more than Earth's galactic home.
What are the 2 types of spiral galaxies?
Spiral galaxies appear as flat, blue-white disks of stars, gas and dust with yellowish bulges in their centers. These galaxies are divided into two groups: normal spirals and barred spirals.
What are the 4 types of galaxies?
Scientists have been able to segment galaxies into 4 main types: spiral, elliptical, peculiar, and irregular.
How big is the average spiral galaxy?
Spiral galaxies come in a wide range of sizes, from 5 to 100 kiloparsecs across, have masses between 109 and 1012 solar masses, and luminosities ranging from 108 to 1011 time that of the Sun. The majority of spiral galaxies rotate in the sense that the arms trail the direction of the spin.
How old is NGC 6946?
10 billion years This makes NGC 6946 very rare, indeed… Since its barred structure was noted back in Herschel's time and its age of 10 billion years puts it beyond what is considered a “modern” galaxy.