The Bubble Nebula, also known as NGC 7635, is a giant cloud of gas and dust in the constellation Cassiopeia, about 7,100 light-years from Earth. NGC 2392, captured by NASA's James Webb Telescope, also ...

We obtained low‐ and moderate‐dispersion spectra of the spatially resolved halo planetary nebula H4‐1 in the wavelength region of 3700–6800 Å with the Cassegrain Spectrograph of the 74 inch telescope.