NASA Hubble Space Telescope Captures Gravitational Lens to Prepare for Roman Space Telescope Operations

NASA’s Hubble Space Telescope has captured a gravitational lens to prepare for upcoming science work with the Nancy Grace Roman Space Telescope. Gravitational lensing occurs when a massive foreground object warps spacetime, bending and magnifying light from a more distant background object like a giant cosmic lens.

In this observation, a foreground elliptical galaxy located roughly 4.5 billion light-years away magnifies a background galaxy situated about eight billion light-years away. The light from the background galaxy appears as a pair of distorted arcs on opposite sides of the foreground object, a setup known as an arc-counterarc pair.

By studying how these lenses distort background light, researchers can calculate the mass of the foreground galaxy and estimate the amount of dark matter it contains. Visible matter alone cannot account for the observed distortion levels, making these lenses vital tools for investigating the invisible substance that makes up most of the universe's mass.

Hubble views targets one at a time with high resolution, whereas the upcoming Roman telescope features a much larger field of view for sweeping panoramas.

Astronomers are using Hubble's sharp imagery to build computer models that will help analyze future data from Roman, and Hubble will also follow up