In cosmology, the study of galaxy formation and evolution is concerned with the processes that formed a heterogeneous universe from a homogeneous beginning, the formation of the first galaxies, the way galaxies change over time, and the processes that have generated the variety of structures observed in nearby galaxies.

2024年10月22日 · Galaxy Evolution. In 2004, NASA released the Hubble Ultra Deep Field. This image of a small part of the constellation Fornax contains around 10,000 galaxies, some of which existed 13 billion years ago, less than 800 million years after the big bang. Snapshots like these allow scientists to study galaxies at different evolutionary stages.

But galaxies haven’t always been around, and they have changed over the universe’s 13.8 billion-year history. Astronomers study the ways galaxies form and evolve by comparing the different shapes across the history of the cosmos, and tracing how they came to look the way they do.

2022年7月13日 · Here are some of the most promising theories of how galaxies form, how and why they merge, as well as the different varieties of galaxies that have been observed. As the universe expanded in size...

2023年9月28日 · Determine how galaxies evolved from their formation up to the present time. Visible light Hubble data combined with infrared data from Spitzer, went into creating this stunning image of M51, the Whirlpool galaxy. M51, as you can see, is actually two interacting galaxies (formally NGC 5194 and 5195).

2022年4月11日 · Armed with our observations and current understanding of galaxy evolution over cosmic time, dark matter, and large-scale structure, we are now prepared to try to answer that question on some of the largest possible scales in the universe.

2025年3月16日 · Evidence for this new understanding of galactic evolution comes primarily from two sources: more detailed studies of nearby galaxies with new, more sensitive instruments and deep surveys of extremely distant galaxies, seen when the universe was young.

From the early 1990s to the present, it has allowed astronomers to leapfrog across the universe to unveil an undiscovered country where galaxies evolved from smaller and more primitive assemblages of stars. These are Hubble snapshots of huge galaxy clusters that …

Galaxies form out of immense clouds of gas that collapse and rotate. As they evolve, stars form within them. Entire galaxies can collide, changing their appearance. Looking deep into space, we see galaxies at earlier stages in their lives, and learn more about their evolution.

2012年10月19日 · It tracks the development of a single disk galaxy from shortly after the Big Bang to the present day. Colors reveal old stars (red), young stars (white and bright blue) and the distribution of gas density (pale blue); the view is 300,000 light-years across.