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A rectangular poster is to have a total area of 200 square inches. If the poster has one-inch margins on the left and right sides, and two-inch margins on the top and bottom, and the rest of the poster contains printed material, what are the dimensions of the poster which will give the largest printed area?

The term in the equations of general relativity that represents a repulsive force in the universe is

Astronomers have found that there is more helium in the universe than stars could have made in the 13.8 billion years that the universe has been in existence. How does the Big Bang scenario solve this problem?

Nonluminous mass, whose presence can be inferred only because of its gravitational influence on luminous matter is known as

What is the least common type of galaxy?

Sofia and Mateo have been together for years. Throughout their relationship, Sofia has consistently cooked for Mateo, helped him through difficult times, and supported his family during hardships. According to the Chinese concept of gan qing, what does Sofia’s behavior most likely represent?

If no light or energy can escape from a black hole, then how is it that Active Galactic Nuclei are so luminous if they are powered by black holes?

Research has consistently shown that college students are more likely to become friends with the person assigned to the dorm room next door than with someone three floors away. Which concept best explains this pattern?

How is the existence of dark energy inferred?

Which type of galaxy rarely has an active nucleus?