You said you like astrophysics, you like astronomy, you like physics, and your friends can help you

I don't think it's as serious as you say, you can eat enough to learn anything, and you apply for what you think is a good major, and then there are also those who are not good. I think the first problem is that you have to know whether you are engaged in theoretical physics, and if you are a first-class talent, you can go abroad for further study in the future. The second is that it is not a bad idea to stay in school in China, take a doctorate, become a university teacher or enter a college; If you are looking for food in the society with everyone, you must consider it, which is related to the overall quality of the individual and the degree of fever. However, as a person who has come before, I highly recommend applying for the major that I am interested in and passionate about as the first choice.

Whether or not to rely on it to eat is one thing, the important question is that now the disciplines are very specialized, and without the systematic study of the university, you will never be able to enter that door, and you can only be at the amateur level. On the other hand, if you study a major that you are interested in, you will naturally have the enthusiasm to study and achieve twice the result with half the effort. It's a kind of happiness to be able to do the work you like, and there aren't many people who have this kind of happiness, and I'm from the past, so I don't want you to have regrets in the future.

Of course, as I said above, you still have to do what you can, after all, it is not an industry that is popular in society.

A very practical question. I used to love physics and tried to learn it, but physics couldn't fill my stomach.

First of all, we must know the gravitational formula f=g*m*m (r 2) and the meaning of each letter of this formula.

Then, let's say:

The mass of the Earth is m1 and the mass of the Moon is m2; The point at which an object is neutralized by the gravitational pull of the Earth and the Moon has a mass of m.

It is at a distance of l1 from the Earth and l2 from the Moon.

Then it is subject to the gravitational pull of the earth f1=g*m1*m (l1 2).

Subjected to the gravitational pull of the Earth f2=g*m2*m (l2 2).

Then because it is at the neutralization point of the gravitational pull of the moon and the earth, the gravitational force of the two is equal, i.e., g*m1*m (l1 2) = g*m2*m (l2 2), and the two sides are subtracted to get m1 (l1 2) = m2 (l2 2).

The mass of the earth m1 and the mass of the moon m2 can be found in the table, and the distance between the earth and the moon (l1+l2) can also be found in the table.

Solving the above equation gives us l2=?That is, how far away is the rest point of this gravitational attraction from the Moon.

**If you don't understand yet, please ask.

Think of the Earth, the Moon, as a particle.

Let the neutral point be at a distance of x from the Moon, which can be obtained from the law of gravitation.

gmm/(r-x)2 = gmm/r2

I don't study physics all over again, and taking physics class is just going to sleep, and sleeping is going against the teacher!