There are many different spiral galaxies that are visible in our night sky. In fact, more than 75% of all the visible galaxies are spirals! Probably the best example of a true spiral galaxy is the Pinwheel galaxy, which is a face-on spiral galaxy.

2018年11月19日 · Spiral galaxies are twisted collections of stars and gas that often have beautiful shapes and are made up of hot young stars. Most of the galaxies that scientists have discovered so far...

Spiral galaxies are named by their spiral structures that extend from the center into the galactic disc. The spiral arms are sites of ongoing star formation and are brighter than the surrounding disc because of the young, hot OB stars that inhabit them.

2020年1月8日 · Spiral galaxies are the most common type of galaxies found throughout the Universe. Around 60% of the observable universe is comprised out of spiral galaxies. Spiral galaxies are mostly found in low-density regions, and very rarely at the center of galaxy clusters.

2024年12月1日 · Learn about spiral galaxies’ rotation, shape, size, stellar composition, arm structure, central region, and overall disk characteristics. Spiral galaxies are divided into two types: normal spirals (SA) and barred spirals (SB). Spirals have a central bulge and disk with spiral arms, lacking a bar-shaped structure.

Spiral Galaxy. A spiral galaxy typically has a rotating disc with spiral ‘arms’ that curve out from a dense central region. The Milky Way is a spiral galaxy. Four classes are used to classify galaxies: spiral; barred spiral; elliptical and irregular. Spiral galaxies have a complex structure: a dense central bulge lies at the centre of a ...

2019年10月20日 · Spiral galaxies are characterized by their sweeping arms which stretch out from the central region in a spiral pattern. They are subdivided into classes based on how tightly the arms are wound, with the tightest classified as Sa …

2023年10月16日 · A spiral galaxy is a kind of galaxy that looks like a flat, slowly rotating disk with a bulge in the centre, and spiral patterns extending outward from the bulge. It contains stars, gas, dust, dark matter and a supermassive black hole at its centre.

Spiral galaxies are made up of young stars, gas, and dust. You can see the dust in the dark spots of the spiral arms. The gas and dust are used to make new stars, and these baby stars glow very brightly. Astronomers use these facts to determine that spirals are typically young galaxies.

2022年11月30日 · Scientists believe approximately 60% of the galaxies in the universe are spiral galaxies. In addition to filling up all that space in the sky, this number means that spiral galaxies like ours are home to most of the stars and planets in the universe.