PSU Astro 7N Exam 1

What two properties of a planet affect the gravity we feel on its surface? - Answer- Mass and radius Two planets have the same radius. If Planet A is 5 times more mass than Planet B, how does gravity differ on the surfaces of the two planets? - Answer- Gravity is 5 times stronger on planet A Say that there were a planet X in our Solar System with a mass 1/4 the mass of Earth and a radius 1/2 the radius of Earth. How will the gravity on its surface compare to the surface gravity of Earth? - Answer- Surface gravity on planet X is the same as on earth A planet in a nearly circular orbit with its rotation axis tilted by 5 degrees relative to its orbital plane around its star would ... - Answer- Have seasons that are not very different from each other as compared to Earth The rotation axis of the Earth is ... - Answer- Tilted at about 23 degrees relative to the axis of the Earth's orbit around the Sun In the diagram above, what season and planet is being represented by the red X on the planet on the left in orbit around the Sun? - Answer- When is the waning gibbous moon highest in the sky? - Answer- About 3 am What phase is the Moon in, when observed by the person standing on the Earth in the diagram above? - Answer- New At what time will the Moon set on the day of a Solar eclipse? - Answer- Sunset Stars that are in the same constellation ... - Answer- are likely to be at very different distances from us. The "North Star" is a star in the constellation of Ursa Minor, which lies just above the North pole of Earth. Which of the following is true? - Answer- Ursa Minor is a Zodiac constellation in the summer but not in the winter A particular Zodiac constellation is high in the sky at midnight in April. Where will it be in October? - Answer- Near the Sun in the daytime sky What do you expect the spectrum of an object that is 1,000,000 Kelvin to be like? - Answer- It should peak at X-ray wavelengths