On the question of the study of physical astronomy, I would like to point out.

Learn some basic disciplines first, you can learn from calculus, linear algebra, first see for yourself, and then learn mathematical physics methods, this course is the doorway of physics, and then in this process, first learn some content of classical physics, including thermal, mechanical, optical, electromagnetic, and then, you can understand the part of modern physics, including 4 mechanical engineering: quantum mechanics, electrodynamics, thermodynamics and statistical physics, theoretical mechanics, these are somewhat difficult, you can go to the Internet to search for some professors' lectures from famous schools to see, Of course, interest comes first, physics is yearning for its broadness, as long as you work hard and don't give up, there is nothing you can't learn, come on!

About ** tutorials, I personally recommend it, after all, physics things need a lot of interest and perseverance, now there is a network is very convenient, search for some popular science lectures on the Internet, or special lectures by well-known professors will be very useful, and the effect may be better than taking professional courses in college. FYI.

I think you should go to each school and ask if there are any cross-school electives or something.

Calculus in mathematics. Linear algebra. Probability theory is to be learned (step by step, mathematics is a tool, so you must learn it seriously) of course, the geometric knowledge of mathematics should also be learned, including the knowledge of circles, ellipses, and hyperbolas.

Physics is more difficult, and interest is very important, so read more books, don't know how to search on the Internet, and ask the better students in physics.

If you look at the starry sky in one place, you can see the same starry sky on different days. The starry sky seen at 10 p.m. tonight will still be visible at 9 p.m. 15 days later.

The vernal equinox is one intersection of the ecliptic and the celestial equator, and the other is the autumnal equinox. Since the location of the equinox is not fixed, there is no definite right ascension and declination.

Celestial distances can be measured using the annual parallax method of stars, but this method is not suitable if the stars are too far away from us, because the parallax is too small to measure. The spectroscopic parallax method can also be used.

Absolute magnitude is the illuminance produced by the star in the plane perpendicular to the line of sight at the observation point, and it is the amount inherent in the star itself that measures the star's ability to radiate, regardless of the distance from the star to the Earth.

Apparent magnitude refers to the magnitude of the star that people see with the naked eye.

Relationship between apparent magnitude and absolute magnitude: If you move a star to a distance of 10 pc, the apparent magnitude is an absolute magnitude. There is a conversion formula between the two:

m=m-5lgr+5 m is the absolute magnitude, m is the visual magnitude, and r is the distance (note, the parsec!). That's the connection between the three.

These are all typed by my hand、、Give it the best

Very weirdly identified with the person Territ gentle.

I am doing astronomical work, and as far as I know, no one in the world has been able to answer you, including Hawking and Penrose, and there are serious differences between the two authorities, Hawking and Penrose. This is the ultimate question of the universe and, in the words of the writer Gribbin, "the part where science has infiltrated the realm of philosophy."

Personally, I believe that there are two ways to think about these issues, and they should be promoted at the same time and complement each other. The first is that there must be a necessary basis for mathematics, which is the prophecy of the universe. Then, there is imagination, you can take a look at Da Liu's "Three-Body Problem", which is an extremely high level of imagination based on scientific facts.

Thinking about these questions may take a lifetime, but it will be rewarding in the end.

ps: I recommend a personal favorite book for you to read, Penrose's.

The answer is a.

To be honest, I don't know the mass ordering of the four black holes, and the classification boundaries. But it is still possible to make a reasonable judgment on this question. The event horizon radius is 10 to the minus fifteenth power, or one millionth of a nanometer, which is thousands of times smaller than the radius of a hydrogen atom.

With such a small order of magnitude, isn't the answer obvious?

I'm afraid this question is very abstract, right? If you think about it, it's not necessarily.

Hi in more detail facts, but also just two hands typing horse know you don't understand yet. 。

If nothing else, the mass of the Earth is kg, and it is only 10 grams to the power of 15, and the Earth is 10 12 times larger.

Choose A. Miniature black holes.

The answer is a.

With a mass of 1 billion tons, the size of the event horizon is on the order of magnitude of the atomic nucleus, which is exactly in line with the concept of miniature black holes.

Astronomy is a branch of physics, and most popular science books do not talk about astronomy alone, and pure astronomy books include "Hundreds of Billions of Suns". At present, the forefront of physics and the real natural science praised by physicists is cosmology, and there are many related books, such as "A Brief History of Time", "The First Three Minutes", and "Parallel Universe", which are very popular science books. Another area of great interest to physicists is string theory and m-theory, which are new theories developed in search of Ein's private grand unification theory, the so-called grand unification theory is a new theory that unifies the four basic interactions of the universe - weak interaction, strong interaction, gravitational interaction and electromagnetic interaction, and the best books on this are "The Strings of the Universe" and "The Dream of the Ultimate Theory".

Others: Quantum Mechanics, "Does God Roll the Dice", "New Quantum World". If you don't know much about physics, I recommend you watch Gamow's "Adventures in the Physical World", and the first push series is very good, read more of those.

This question is to investigate the minimum resolution angle of diffractive optics. , d = l, and solve d

1.I don't know, the lack of intermediate-mass black holes is a hot topic in astronomical research at present, and I don't know if the author lives in the east world.

Remember, it is the core quality left behind.

The ray burst occurred on December 14, 1997, numbered "GRB971214", and the location of the ray source was "1sax, with the front half being right ascension and the back half being declination, and this location was located in the constellation Deer Leopard.

Give a definite sentence (the transfer of orbits between celestial bodies) is good or not......All tracks, if not taken into account friction and perturbation, do not require energy to maintain.

Inexplicably, astronomy and mathematics, physics and chemistry belong to the six basic natural sciences together, and they intersect with each other and do not belong to each other. And they follow the same set of logic, based on observations and experiments, to formulate hypotheses, and to verify hypotheses ......B was chosen purely because the intersection of astronomy and physics is relatively large.

Finally, there is an uncontroversial issue.

Callisto, Titan, Callisto, Europa are all larger in diameter and mass than the Moon.

The author's astronomical skills are very average, both in terms of astronomical basis (there are many controversial issues) and language (4, 5, 7 lack the necessary definite terms), and in terms of understanding the frontiers of astronomy and the scientific method.

Cognitively. There was also a ray burst in 1997, and I can't remember even the most hardcore enthusiasts, and it was purely a test of the ability to search for information. Anyway, this question is very tiring and helpless to answer, such as the first.

I really can't give an answer to a question, so please be blind.