No Man’s Sky has been updated to version 3.70 today by Hello Games. You can find out the complete patch notes for this update from here.
The update has a varying size ranging from as high as 10 GB to as low as 4 GB. The download size depends on your platform, so on PC, it will be around 5 GB while on consoles it is usually larger than 5 GB. You can find out the patch notes below, or have a look at them on the official website.