I want to buy a SLR to shoot the stars, please recommend me.

For astronomy photography, Canon has specially released a 60Da.

The Canon EOS 60Da is a digital SLR camera aimed at astronomers and enthusiasts. The 60Da adjusts the infrared filter based on the 60D and replaces it with one that is more sensitive to Hα (Hydrogen-Alpha) rays. 18-megapixel APS-C format sensor. In addition to the 3" rotatable high-definition LCD screen, 9-point AF system and TV output and other features, the 60Da also has the silent shooting function that appeared on the 5D Mark III. In addition, Canon also equipped the 60Da with the RA-E3 remote controller, which can Shot with an exposure of more than 30 seconds, and an AC power adapter component.

The Canon 60Da uses an improved APS-C frame sensor. In addition to its original low-noise advantage, it also has a specially customized infrared filter. Its sensitivity to Hydrogen-alpha (hydrogen atom emission line, or Ha spectrum for short) is three times that of the standard EOS 60D, thereby achieving more ideal astronomical shooting effects.

The above is just a popular science.

You have been talking for a long time. The first thing is: What is your budget? The general idea for you is to focus on the lens first. Although it does not have to be done in one step, it is best not to do it in one step. Start with a digital kit.