Hubble Telescope Maps Cosmic Flow with Image of Distant Dwarf Galaxy
New data from the Hubble Space Telescope contributes to a legacy archive of local galaxy stars, helping scientists understand how uneven matter distribution drives the movement of cosmic structures.
The NASA Hubble Space Telescope has captured a new image of ESO 490-017, a dwarf irregular galaxy situated approximately 23 million light-years away in the constellation Canis Major. With a diameter of roughly 12,000 light-years, the galaxy exhibits low surface brightness, appearing as a faint swarm of stars positioned behind brighter foreground objects.
The observation was conducted as part of a broader Hubble programme designed to study the movement of galaxies and galaxy clusters through space. This scientific effort aims to understand how matter is distributed unevenly across the universe and how its gravitational influence drives the “cosmic flow,” or the movement of large-scale structures.
Hubble is uniquely capable of providing precise distances to nearby galaxies like ESO 490-017 by measuring the luminosities of low-mass red giant stars. Astronomers utilise these stars as “standard candles” to determine distance, a method that allows for accurate mapping of the local universe. The data collected contributes to a legacy archive of the types of stars found in local galaxies.
In the captured image, the faint glow of ESO 490-017 is visible behind brighter foreground stars, which are easily recognised by their diffraction spikes. The black background is peppered with numerous red, orange, and beige dots representing distant galaxies, many of which exhibit distinct spiral structures.
Since its launch in 1990, the Hubble Space Telescope has fundamentally changed the scientific understanding of the universe. This latest observation continues that legacy, providing critical data on the dynamics of cosmic structures and the distribution of matter on a grand scale.
