Astro 7N Exam 1 Passed Actual Exam Questions And Correct Answers

Astro 7N Exam 1 Passed Actual Exam Questions And Correct Answers when we have summer in the Northern hemisphere? Winter - ANSWER -What season is it in the Southern hemisphere when it is summer in the Northern hemisphere? In the northern hemisphere, the nights are longer than days= - ANSWER -Winter begins on or about Dec. 21 Days and nights have equal lengths= - ANSWER -Spring begins on or about March 21 Days longer than nights in the North= - ANSWER -Summer begins on or about June 21 Days and nights have equal length= - ANSWER -Fall begins on or about Sept. 21 What happens to the moon in one month - ANSWER -It moves around the Earth once what causes the phases of the moon - ANSWER -sun is lighting different fractions of the part of the moon that we see What is the order of the moon phases - ANSWER -new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, waning crescent When is the full moon visible? - ANSWER -Only at night. It transits at midnight, rises 6 hours earlier at sunset and sets 6 hours later at sunrise. When is the new moon visible? - ANSWER -The new moon is visible during the day. It transits at noon, rises 6 hours earlier at sunrise, and sets 6 hours later at sunset. How are the Sun, Earth, and Moon positioned when it is new Moon? - ANSWER -In a straight line: Sun Moon-Earth How are the Sun, Earth, and Moon positioned when it is full Moon? - ANSWER Sun-Earth-Moon What is a solar eclipse? - ANSWER -Moon blocking the Sun's light or a location on the Earth's surface passing under the Moon's shadow. How are the Sun, Earth, and Moon positioned when it is a solar eclipse? - ANSWER -Sun-Moon-earth What is a lunar eclipse? - ANSWER -Earth's shadow on the Moon How are the Sun, Earth, and Moon positioned when it is a lunar eclipse, and what phase is the Moon in? - ANSWER -Sun-Earth-Moon (as in full moon) Why do eclipses not happen every month? - ANSWER -The moon orbits the earth in a slightly different plane than the earth orbits the Sun What about eclipses of the moons of mars? - ANSWER -Mars has two small moons, Phobos and Deimos. Relative to Earth's Moon, they are tiny, and closer to their planet and orbiting faster — and closer to the orbital plane of Mars around the Sun. This leads to more frequent eclipses visible from Mars. Constellation - ANSWER -large defined areas of the sky (like states in a map of a country) •anything visibly within that region is considered "in" that constellation •there are 88 of them, in all (dividing up the total celestial sphere) Ecliptic - ANSWER -the apparent path of the Sun over the course of a year, with respect to the distant stars — also refers to the plane in which the Earth orbits the Sun. Zodiac Constellations - ANSWER -the 12 (or 13) constellations that lie along the ecliptic. The Sun is inside a Zodiac constellation at all times = - ANSWER -In each one for about a month, each year. During this time you cannot see that constellation since it is behind the sun all day and not on the nighttime side of Earth winter zodiac constellations - ANSWER -ones opposite the sun in the winter Summer zodiac constellations - ANSWER -ones opposite the sun in the summer Photon - ANSWER -Light has some properties of a wave and other properties of a particle. A "particle of light" is called a Forms of light, from high-energy to low-energy - ANSWER -gamma ray- X-ray- Ultraviolent- visible- infared- microwave- radio high energy, high frequency - ANSWER -low/ short wavelength and a bluer color Low energy and low frequency - ANSWER -high/ long wavelength a redder color All forms of radiation travel at the - ANSWER -speed of light Wavelengths of radio waves= - ANSWER -meters and centimeters wavelengths of visible light= - ANSWER -ten-billionths of a meter (hundreds of nanometers) Wavelengths of xrays - ANSWER -even smaller A prism splits light into different colors by - ANSWER -bending different wavelengths by different angles Blackbody spectrum - ANSWER -higher temperature = more light in total, and a peak intensity at a shorter wavelength (or at a bluer color) The Sun's surface temperature is about 5800 degrees Kelvin. - ANSWER -Its spectrum peaks in the visible light region (peak around green —a "green star"!). Room temperature is about 300 degrees Kelvin; a "blackbody" at room temperature peaks in - ANSWER -The infrared region of light What kinds of radiation get through the Earth's atmosphere? - ANSWER -Visible and radio Continuum spectrum - ANSWER -light at all wavelengths Absorption spectrum - ANSWER -shows absorption lines — dark lines in the spectrum at certain wavelengths, superimposed on a continuum spectrum —