Since no one has explained what esasky is: esasky allows professional astronomers (and anyone else because astronomy is all about open science) to view science observations from observatories across the world in one place.<p>If you look in the top-left corner you'll see a bunch of controls.<p>The first one (with three layers) chooses what is displayed. You can choose from loads of surveys (some which cover the whole sky, others that only cover a part) at loads of different wavelengths (and because the sky does change, search for LSST, there's an implicit time aspect as well). These are the original images (ignoring the underlying reduction process each survey does), these are for science not outreach. This is the button to play with (see how the same spot looks in visible vs. radio vs. x-ray).<p>Next button allows you to pick specific observations (as the all-sky part has implications about how you tessellate images), not that useful unless you understand what you're doing in more details than I have space for.<p>After that is catalogues of objects. This information will be compiled by survey teams, and is derived from various sources (including other catalogues). The magical astronomy keyword here is "TAP" for Table Access Protocol.<p>Spectra and timeseries is the next button, you're (generally) looking at spectra/timeseries from individual objects here, but things get more complex here.<p>The remaining buttons are really of no interest outside the profession sphere (though the multi-messager (i.e. not light, think gravitational waves/neutrinos etc.) button might be interesting when LIGO is running).<p>(I'm an astronomy RSE, but I don't work on esasky, nor for ESA).