At what stage of its evolutionary life is the Sun?

What prevents a neutron star from collapsing and becoming a black hole?

Why do astronomers seek to measure gravitational waves simultaneously with at least three detectors?

Where are the MOST massive stars to be found in the main sequence of a Hertzsprung–Russell diagram?

A star of apparent magnitude +2.1 appears _____ than a star of apparent magnitude –1.2.

In the spectral classification scheme, what designation is given to a star just a little cooler than a K5 star?

The spectrum of an ordinary main-sequence star is a

The Sun’s spectrum peaks in the green region (i.e., green is the most intense color in its spectrum). The spectrum of Rigel (the knee of Orion) peaks in the short-wavelength end of the visible spectrum. Compared with the Sun, Rigel is

A planetary nebula is a

An investigator studied the relationship between marital status and attitudes towards same-sex marriage. Thirty people that identified as heterosexual were interviewed for the study. 10 participants were single, 10 were married, and 10 were divorced. An attitude questionnaire was then administered to each participant in order to measure their attitude towards same-sex marriage. The scale ranged from 1 to 12 with higher scores representing a more positive attitude towards same-sex marriage. What is the critical value for this problem?