Lecture Tutorials For Introductory Astronomy Answer Guide (2024)

Where would the observer look if star B is at the position B3? Question: Where would the observer have to look to see star B when it is at position 3 ? Celestial Sphere Rotation Face North and look low on the horizon.

Are all stars above the horizon for exactly 12 hours and below it for 12 hours? Stars on the celestial equator are up 12 hours and those south of the celestial equator are above the horizon for less than 12 hours because we see less than half of their total 24-hour path around us. (The opposite is true for observers in the southern hemisphere.)

Can you see a star when it is located below the horizon? Some stars never cross the observer's horizon and thus never appear to rise or set so they are always either above or below the horizon. If they are above the horizon they are called circumpolar and are always visible throughout the year. If they are below the horizon – they cannot be seen from that latitude.

Does it take 12 hours for a star to rise in the east and set in the west? Student: The amount of time that all stars are above the horizon is 12 hours because it takes 12 hours for a star to rise in the east and then set in the west.

What is the rarest star? Class O. O-type stars are very hot and extremely luminous, with most of their radiated output in the ultraviolet range. These are the rarest of all main-sequence stars.

What are the 7 types of stars? There are seven main types of stars: O, B, A, F, G, K and M. The O stars are the bright, hot, blue stars and the M stars are the dimmer, cooler, red stars. A common mnemonic for remembering the order of the classifications is: 'Oh Be A Fine Girl, Kiss Me.

How long until the stars are no longer visible? Most stars will “live” for somewhere in the neighborhood of 1 billion years, so the odds are low that any particular star died during the past 10,000 years.

What are stars that remain above the horizon for 24 hours called? A circumpolar star is a star that, as viewed from a given latitude on Earth, never sets below the horizon due to its apparent proximity to one of the celestial poles.

Do stars rise 4 minutes earlier each day? Because Earth moves around the Sun (roughly 1° per day), after one complete rotation of Earth relative to the stars, we do not see the Sun in the same position. Because our ordinary clocks are set to solar time, stars rise 4 minutes earlier each day.

What are 5 constellations that do not go below the horizon? All circumpolar constellations are found near the celestial poles and, due to their proximity to the poles, they never disappear from view. The five northern constellations visible from most locations north of the equator throughout the year are Cassiopeia, Cepheus, Draco, Ursa Major, and Ursa Minor.

Why are there no circumpolar stars at the equator? Every star south of the celestial equator is circumpolar, whereas every star north of the celestial equator remains beneath the horizon. At the Earth's equator, no star is circumpolar because all the stars rise and set daily in that part of the world.

Which stars would you never see from the South Pole? The Big Dipper and the North Star are not visible from there.

Will there ever be a star that rises in the west and sets in the east? Answer: The Sun, the Moon, the planets, and the stars all rise in the east and set in the west. And that's because Earth spins -- toward the east.

Why do all stars rise in the East? Students use geometric knowledge to prove that while Earth rotates from west to east, the sun, moon, stars and planets appear to rise in the east and set in the west. Student and teacher pages are included.

Why do stars look like they're moving? These apparent star tracks are in fact not due to the stars moving, but to the rotational motion of the Earth. As the Earth rotates with an axis that is pointed in the direction of the North Star, stars appear to move from east to west in the sky.

Where would the observer have to look to see star A when it is at position 1? Star A is just visible above your eastern horizon at Position 1.

At which position is star B not observable? Is either Star A or B ever in an unobservable position? If so, which position(s)? yes, star A is unobservable at position 4 when it is below the horizon. Star B is never below the horizon, so it is never in an unobservable position.

At which position if any does star B rise and set? A star is setting when it travels from a position above the viewers horizon to the position where it is above the horizon . Star A is visible above the western horizon at point A3 . Star B never reaches the horizon , therefore there are no points in which Star B rise 's and sets .

What is a B type main sequence star? A B-type main-sequence star (B V) is a main-sequence (hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K.

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