Astro 1 - Study guides, Class notes & Summaries

Astro 1 Final (Penn State) Real exam questions and answers latest update

Why do we see the Moon appear to go through phases as seen from Earth? A. The Moon reflects "Earthshine", so it depends on how much light from the Earth is hitting the Moon B. As the Moon rotates, it presents a different phase to us over the course of its "day". C. Depending on where the Moon is along its orbit, we see different amounts of its illuminated side D. The Earth's shadow blocks out part of the Moon from time to time - C. Depending on where the Moon is along its orbit, we see...

what is the sun comprised of? - 73% hydrogen 25% helium why is the sun stable? - outward force of gas pressure; inward force of gravity Where does the gas pressure in the sun come from? - nuclear fusion reactions in the core at temperatures of 15 million degrees What is the diameter of the sun compared to earth? mass? luminosity (compared to 100W lightbulbs? - diameter-109x; mass-333,000; luminosity- 4 x 10^24 What percent of mass in the solar system comes from the sun? - 99.9% how long h...

Astro 1 PSU Exam QUESTIONS WITH COMPLETE SOLUTIONS Which is the smallest object? - CORRECT ANSWER -A neutron star A galaxy has an H-alpha emission line observed at a wavelength 10 percent larger than the rest wavelength of H-alpha. What is the redshift of the galaxy? - CORRECT ANSWER -0.1 What is in this image? - CORRECT ANSWER -Supernova remnant Which is the most luminous? - CORRECT ANSWER -Quasar Which contains the most stars? - CORRECT AN...

ASTRO 1 PSU- FINAL EXAM #4 QUESTIONS AND ANSWERS COMPLETE.

Astro 1 Kregenow Midterm 2 Questions with 100% Correct Answers | Verified | Latest Update 2024

ASTRO 1 (PSU) EXAM QUESTIONS WITH COMPLETE SOLUTIONS Copernicus - CORRECT ANSWER Had idea of sun centered universe (heliocentric) Keplers 1st law - CORRECT ANSWER Planets revolve around the sun in elliptical orbits w/ sun at the focus What best describes orbit of earth around the sun - CORRECT ANSWER Ellipse that is close to a circle Keplers 2nd law supports idea that when a plant is closer to the sun its speed is greater - True or False - CORRECT ANSWER ...

A headline reads, "Brightness of Star X has significantly decreased, now at a magnitude of 1.50." Given what you know of magnitude values of stars, which of these could the magnitude have plausibly been before the decrease in brightness? a. 2.3 b. 5 c. -1.7 d. -3.4 e. 0.2 correct answers e. 0.2 A scientist hypothesizes that drinking milk causes pimples in humans. He tests his hypothesis by drinking milk and observing his own skin. After consuming milk, the scientist breaks out in pim...

Why do we see the Moon appear to go through phases as seen from Earth? A. The Moon reflects "Earthshine", so it depends on how much light from the Earth is hitting the Moon B. As the Moon rotates, it presents a different phase to us over the course of its "day". C. Depending on where the Moon is along its orbit, we see different amounts of its illuminated side D. The Earth's shadow blocks out part of the Moon from time to time - C. Depending on where the Moon is along its orbit, we see...