Today, astronomers can detect and measure stellar parallax for thousands of the nearest stars, providing us with direct evidence that earth really does orbit the sun. moreover, as the parallax angle animation shows, these measurements allow us to calculate distances to these relatively nearby stars. if we hope to use parallax to measure distances to even more-distant stars, which of the following telescopes would be most useful?

What makes water a renewable source

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups.b. a researcher conducts a linguistic study of comments posted on a local public blog.c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression.d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.

The renting agent says i have to rent for at least one year. but i’m not sure how many months i’ll be in town.