In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

Q: It exists because of electron degeneracy pressure; as electrons are compressed closer together, more exist per unit volume and must take on higher energy levels as mandated by the Pauli-exclusion principle. A relativistic state equation can be used to calculate it as the radius of a white dwarf decreases with an increase in its mass. Developed shortly before its namesakes theory on black holes, for ten points, name this value of about 1.4 solar masses, the maximum mass of a star which can be supported against gravitational collapse.

A: Science
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Q: This organelle's lamina helps support its shape. Some protists have both a macro and micro version of this organelle. One part of this organelle is the location of ribosome synthesis, while importins and exportins assist in transport in and out of this organelle. This organelle, whose envelope is continuous with the rough endoplasmic reticulum, has pores in its double membrane. Transcription occurs within this organelle, which disappears during mitosis as its chromatin assemble into chromosomes. For 10 points, name the control center of the cell.

A: Science
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Q: His long campaign to win Livonia eventually met failure at the hands of Stephen Bathory, but he did conquer Kazan and Astrakhan and made the first Russian inroads into Siberia. The son of Vasily III, his reign was characterized by his struggles with the boyars, leading him to call the first national assembly, the zemski sobor, and establish his own state called Oprichnina within Russia. After the death of his first wife Anastasia in 1560 he experienced a decline in emotional stability which is the source of his current fame. FTP, who was this first czar of Russia, known as * "the Terrible"

A:
History
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