Astronomers - Study guides, Class notes & Summaries

 -1.5 magnitude Sirius appears 25x brighter than 2 magnitude Polaris.  “All neutron stars are pulsars, but not all pulsars are neutron stars” FALSE  “Spectroscopic Binary” is the term given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts.  A 6.8 solar mass neutron star does NOT exist.  A loop of gas and charged particles following the magnetic field lines between sunspot’s poles is a Prominence/...

GACE Middle Grades Science Latest Update with Verified Answers tidal hypothesis Theory that the solar system started with a near collision of sun and large star. Few astronomers believe this theory. condensation hypothesis solar system began with rotating clouds of dust and gas. Condensation happened in center to form sun, and smaller parts of clouds formed. More astronomers believe in this idea. Core Outer core- liquid; inner core- solid. Very dense in center. Believed that core is...

Even though it is not realistic, why is the celestial sphere model useful? Correct Answer-Describes the locations of things "on" the sky. Declination is measured from the _________ to the __________ Correct Answer-celestial equator; celestial poles How do you measure right ascension? Correct Answer-Measured from "First point in Aries" around the celestial equator Latitude is to declination as longitude is to __________ Correct Answer-Right Ascension Why are the zodiacal constella...

1. What is the single most important reason that astronomers have learned more about our planetary system in the last 30 years than all of history before then. a. astronomers today are a lot smarter than astronomers were earlier b. the Hubble Space Telescope c. we have been able to send spacecraft to visit many planets and satellites d. radio telescope arrays allow astronomers to make out details on the planets that they have never been able to see before e. the planets (moving in their s...

Constellations Correct Answer-Recognizable patterns of stars in the sky (big dipper, orions belt) Makes locating stars easier. The official borders were set in 1928 by the International Astronomical Union (IAU). How many constellations are there? Correct Answer-88 Celestial sphere Correct Answer-our view of the night sky; an artificial sky map created by astronomers that applied a coordinate system to it, analogous to the coordinate system of north-south latitude and east-west longitude ...

tidal hypothesis - Ans Theory that the solar system started with a near collision of sun and large star. Few astronomers believe this theory. condensation hypothesis - Ans solar system began with rotating clouds of dust and gas. Condensation happened in center to form sun, and smaller parts of clouds formed. More astronomers believe in this idea. Core - Ans Outer core- liquid; inner core- solid. Very dense in center. Believed that core is 80% iron. Helps heat oceans. Mantle - Ans Surr...

Rank the following 4 items by how long it takes for light to reach us from these object, from shortest to longest. The Andromeda Galaxy the center of the Milky Way Pluto Sun. Ans- Sun, Pluto, center of the Milky Way, the Andromeda Galaxy. The current best estimate for the age of the universe is about Ans- 14 billion years. What do astronomers mean when they say the universe is expanding? Ans- Average distances are increasing between most galaxies. Which statement is false? 1. A co...

How long does it take the Earth to orbit the Sun? Correct Answer-one year What is the name given to the path of the Sun as seen from Earth? Correct Answer-Ecliptic The ecliptic is best described as a(n): Correct Answer-plane How many months apart are Winter Solstice and the Vernal Equinox? Correct Answer-3 months Over what place on Earth is the Sun directly overhead on the Autumnal equinox? Correct Answer-the equator When you are facing Polaris you are... Correct Answer-...facing ...

___________ forces caused the gas in the thin disk to fragment into clouds or clumps with masses like those of star clusters - ️️gravitational ____________ black hole: a black hole whose mass exceeds 1000 solar mass - ️️supermassive ___________________ is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other - ️️friction (In the absence of a strong magnetic field), what is the chief factor that determines what typ...

tidal hypothesis : Theory that the solar system started with a near collision of sun and large star. Few astronomers believe this theory. condensation hypothesis : solar system began with rotating clouds of dust and gas. Condensation happened in center to form sun, and smaller parts of clouds formed. More astronomers believe in this idea. Core : Outer core- liquid; inner core- solid. Very dense in center. Believed that core is 80% iron. Helps heat oceans. Mantle : Surrounds core. ...