The Heart nebula (IC1805) lies about 7500 light years away in the Perseus arm of our galaxy. It is an emission nebula and gets this red color from all the radiation it receives from the star cluster (Melotte 15) in the middle of the picture.

Cropped photo showing details of dark dust clouds in the nebula.

Telescope: William Optics Zenithstar 61; focal length 360mm
Optolong L-eXtreme narrowband filter
Camera: ZWO ASI533MC-pro, cooled to -10C
5 minute exposures with auto guiding; total exposure of 5 hours;
used dark, flat, bias calibration frames
Processed in SIRIL and PhotoShop