How do astronomers measure the temperature of stars Astro 7n?
How do astronomers measure the temperature of stars? By looking at which absorption lines are present in the star's spectrum.
Do you remember what main sequence means quizlet?
Do you remember what main sequence means? It is an object with a mass less than 8% of the Sun, which cannot have enough nuclear reactions in its core to be a star. As stars form, they heat up.
What is the general result of proton proton chain?
Overall, this chain successively fuses four protons together to make one helium nucleus.
What part of the Sun do we typically see?
The boundary between the Sun's interior and the solar atmosphere is called the photosphere. It is what we see as the visible "surface" of the Sun. The photosphere is not like the surface of a planet; even if you could tolerate the heat you couldn't stand on it.
How do you find the temperature of a star?
To get a stellar temperature:
- Measure the brightness of a star through two filters and compare the ratio of red to blue light.
- Compare to the spectra of computer models of stellar spectra of different temperature and develop an accurate color-temperature relation.
Which of the following stars is hottest?
O stars are the hottest, with temperatures from about 20,000K up to more than 100,000K. These stars have few absorption lines, generally due to helium. These stars burn out in a few million years. B stars have temperatures between about 10,000 and 20,000K.
What is the density at the center of a black hole quizlet?
All matter in a black hole is crushed into a single point at the center, which is called the singularity. It has zero volume and infinite density.
How many protons does a hydrogen atom have quizlet?
a hydrogen atom has one proton, 2 neutrons and no electrons.
How is a neutrino different from a neutron list all the ways you can think of?
First, the neutrino's mass is much, much smaller; second, it hardly interacts with matter at all, where as a neutron interacts with other particles; third, it isn't one of the particles to make up an atom; fourth, it can "oscillate" (change from one type of neutrino to another between the Sun's core and Earth).
What is the proton-proton chain reaction describe this process quizlet?
The proton-proton chain takes the similar hydrogen nuclei and fuses them together to form the larger helium nucleus. Nuclear fission takes a larger nucleus and splits it into smaller nuclei.
What is the Sun called?
sol The Sun has been called by many names. The Latin word for Sun is “sol,” which is the main adjective for all things Sun-related: solar. Helios, the Sun god in ancient Greek mythology, lends his name to many Sun-related terms as well, such as heliosphere and helioseismology.
Which of the following parts of the Sun is the hottest one?
The hottest part of the Sun is its core, where temperatures top 27 million degrees Fahrenheit (15 million degrees Celsius).
What star is the hottest?
White stars are hotter than red and yellow. Blue stars are the hottest stars of all. Stars are not really star-shaped. They are round like our sun.
How hot is the hottest star?
The hottest one measures ~210,000 K; the hottest known star. The Wolf-Rayet star WR 102 is the hottest star known, at 210,000 K.
Which are the hottest stars quizlet?
(Notice that temperature is related to color, and follows the order of the colors in the rainbow: Blue (or violet) stars are the hottest, while red stars are the coolest.)
Is Sun the hottest star?
No, the Sun is not the hottest star; there are many stars much hotter than the Sun! You can tell the approximate temperature of a star by looking at its color. The coolest stars are red, then orange, then yellow (like our Sun). Even hotter stars are white and then the hottest stars are blue!
How can we measure the mass of a black hole Astro 7n?
Answer: One can measure the mass of a black hole by tracing the motion of the gas and dust near the black hole that is being pulled-on by the mass of the black hole. This can be done at many wavelengths, such as by measuring the positions of stars which orbit near a black hole at optical wavelengths.
How does the mass of an object affect escape velocity quizlet?
The escape velocity from a body depends on its mass and on the distance from its center. It is faster for larger mass and smaller distance (i.e. when the body's gravity is stronger).
How are atoms of hydrogen identical to each other and how can they be different from each other?
How are atoms of hydrogen identical to each other and how can they be different from each other? All atoms of hydrogen have one proton in the nucleus and one electron. Some atoms of hydrogen can have one or two neutrons in their nucleus to form different isotopes of hydrogen.
How many neutrons does the most common isotope of hydrogen have quizlet?
2. Deuterium- Isotope of hydrogen, which has one neutron. 3.
Is electron a neutrino?
) is an elementary particle which has zero electric charge and a spin of 1⁄2. Together with the electron, it forms the first generation of leptons, hence the name electron neutrino….Electron neutrino.
| Composition | Elementary particle |
|---|---|
| Generation | First |
| Interactions | Weak, Gravity |
| Symbol | ν e |
| Antiparticle | Electron antineutrino ( ν e) |
What produce neutrinos?
Neutrinos are the most abundant particles that have mass in the universe. Every time atomic nuclei come together (like in the sun) or break apart (like in a nuclear reactor), they produce neutrinos. Even a banana emits neutrinos—they come from the natural radioactivity of the potassium in the fruit.
What nuclear reaction equation summarizes the proton-proton chain which is the source of energy in the Sun?
The overall reaction is: 4 1H+ + 2 e- → 4He2+ + 2 ν
What is the proton-proton chain quizlet astronomy?
What is the proton proton chain? The process by which hydrogen is turned into helium and we get energy.
Who named the Earth?
All of the planets, except for Earth, were named after Greek and Roman gods and godesses. The name Earth is an English/German name which simply means the ground. It comes from the Old English words 'eor(th)e' and 'ertha'. In German it is 'erde'.
How old is the earth?
4.543 billion yearsEarth / Age
What is the hottest layer?
Scientists believe that the inner core is the hottest layer of the Earth, that it is composed mostly of iron and nickel, and that although it is hot enough to be a liquid, it acts as a solid because of the immense amount of pressure on it.
Is the Sun the hottest star?
No, the Sun is not the hottest star; there are many stars much hotter than the Sun! You can tell the approximate temperature of a star by looking at its color. The coolest stars are red, then orange, then yellow (like our Sun). Even hotter stars are white and then the hottest stars are blue!
What are the hottest stars in order?
The spectral sequence of stars runs OBAFGKM.
- O stars are the hottest, with temperatures from about 20,000K up to more than 100,000K. …
- B stars have temperatures between about 10,000 and 20,000K. …
- A stars have strong absorption lines of Hydrogen. …
- F stars are slightly hotter than the Sun.
What is the hottest star and why?
Blue stars are the hottest stars of all. Stars are not really star-shaped. They are round like our sun. Most stars are so much farther from us that they are not as bright as the sun.