Kislev 5 is the yahrtzeit (date of the passing) of Rabbi Shmuel Eliezer Eidels (1555-1631), known by the acronym "Maharsha". Rabbi Shmuel authored a highly regarded and widely used commentary on the Talmud and its primary commentaries, Rashi and Tosfot.

Link: Rabbi Shmuel Eliezer Eidels (Maharsha)

To an astrophysicist:

In recent years, astronomers have discovered that not all stars shine. There are some stars of such tremendous density that instead of radiating outwards, they only draw light in. Therefore, they have named these stars “black holes.”

Fortunately, the universe has enough black holes already. If you have light, shine forth.