Wonderful Universe And Nature(I)

How to name it?

In the 1960s, astronomers discovered a kind of strange celestial body in the vast sea of stars. galvanized steel tubing suppliers It looks like a star but definitely not a star in the photograph. Its spectrum is like a planetary nebula but not a nebula. Radio waves emitted Like galaxies but not galaxies are called quasars.

In 1960, astronomers discovered that the optical counterpart of radio source 3C 48 was a 16-magnitude star-like object surrounded by dark nebular matter. What is puzzling is that there are several completely unfamiliar lines in the spectrum.

In 1962, a 13-class “star” was discovered at the location of radio source 3C 273. Astronomers are equally perplexed by the unusual lines in their spectra.