These are terrific locations to gather scientific information about stars and galaxies and exoplanets.
The Sloan Digital Sky Survey
www.sdss.org (This location has an extensive database of spectra and photometry.
http://cas.sdss.org/dr16/en/home.aspx (This location houses many of the SDSS tool and class labs.)
http://cas.sdss.org/dr16/en/tools/chart/navi.aspx
(This links to the navigate tool so that you can search the skies in the database by RA and Dec. Spectra and Photometry are directly available for objects selected as well.)
NED (NASA/IPAC Extragalactic Database)
https://ned.ipac.caltech.edu/ (This contains extensive information about galaxies.)
IR Databases
https://irsa.ipac.caltech.edu/about.html
GALEX UV Database
http://www.galex.caltech.edu/researcher/data.html
Exoplanet Databases