If you shoot a lot of astrophotos, you know all about gradients. They are almost always present in your images, and they have to be removed to smooth out the sky background and make your images look their best.
Astrophotography
A Resource for Astrophotographers: ‘The Backyard Astronomer’s Guide’

In a previous article (Easing into Astrophotography with a Telescope), I listed a few resources for stepping up to telescopic astrophotography. Beyond learning the basics of sky navigation and learning to extend your photographic equipment knowledge into long exposures, an introductory overview of astronomy is a good idea so that you are aware of the photographic possibilities available to you and the wide array of equipment that may be needed.
Heads Up! Possible Meteor Storm on May 30-31

The month of May closes out with a New Moon (moonless sky), to which deep sky astrophotographers always look forward. This month brings a potential bonus of an intense burst of meteors, perfectly timed for North American astrophotographers. In fact, it’s so perfectly timed (for U.S. residents) that it falls on a Monday evening of a U.S. three-day holiday weekend.
How to Get Started in Deep-Sky Astrophotography With a Telescope and Your Camera

Astrophotography is a very challenging genre, requiring specialized equipment, technical knowledge, top-notch technique, and a lot of patience, but it can be tremendously rewarding when it all comes together and you get a stunning image of something that is an unfathomably large distance from our home. If you are new to deep-sky astrophotography, this great video tutorial will show you the basics of getting started with a camera and a telescope.
Can You Use the Canon RF 800 f/11 for Astrophotography?

Wide field astrophotography is quickly becoming an established niche that is increasingly available to more hobbyist photographers with the availability of better, smaller, and cheaper tracking mounts. But the smallest galaxies, nebulae, and planets have always been prohibitively expensive to capture. Can this lens change that?