There s an astronomical question that came to mind recently! Let s talk about what you know

There are so many types of celestial bodies! There is no such thing as heaven and earth! Planar ones, such as galaxies, are generally disk-shaped, the accretion disks of black holes are also very flat, and rings like Saturn are also very flat.

If you're wondering, consider it in the same way as our physics: what if that celestial body was not made of stones, but of tofu?

If the object is big enough, it must be heavy and gravitational enough, so can this tofu star maintain this flat plate shape, its strong gravitational pull is directed towards the center.

Of course, the stone is very hard, but it doesn't crumble like tofu under the weight, don't you say?

So there are people who don't understand what I mean, and you can see from my words that it means negative, not affirmative.

And when it comes to the flat one, there is also a problem, the Milky Way and Saturn's rings are not a single piece, they are scattered. The astronomical community has calculated that if Saturn's rings are one, they will inevitably shatter, because gravity and centrifugal force cannot be equal everywhere, so even if the whole piece of celestial body rotates, it is unstable and will always break into a lump.

The first floor is true, but a very small substance is also a celestial body in the interstellar world, and if a piece of tofu is still dropped in space, it is also a celestial body, so of course there is a flat celestial body.

A single celestial body that reaches a certain mass tends to be spherical, but the aggregate array composed of multiple celestial bodies is not necessarily spherical but also circular.

The helix of DNA is also a circle, and the disk of the Milky Way is also a circle.

The circle is the law of this universe.

Categories: Science & Engineering.

Problem Description: Planets: Members include Mercury, Venus, Ominous Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Definitions:

Orbiting the Sun, its own dry chakra gravitational force is strong enough to overcome its rigid physical strength to make the celestial body spherical, and it is able to clear other objects in its orbit. What is the idea of "rigid physical strength" in overcoming its rigid physical strength, I just don't understand???

Analysis: "Ability to clear other objects in the vicinity of its orbit" means that when another star approaches it, the object is able to use its gravitational pull to capture or destroy it (i.e., another object intrudes)."Luoxi Limit'time), maintaining the "cleanliness" of its tracks. (Pluto was also expelled from the door because its orbit intersected Hydon Chi Wang but could not capture it.)

As for what "rigid physical strength" is, I don't know. However, it must be a reaction force of "self-gravity", for example, some asteroids are too small in their own mass to make themselves spherical in their own gravitational shape, and form various irregular natural characteristics.

Therefore, my understanding is that the concept of rigid force here should be a force that is not easily deformed because it is a solid force, and it is also a force that is generated by its own gravitational force and resists its own gravitational force

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

The coordinate system on the celestial sphere.

Celestial coordinates. In order to accurately describe the positions of celestial stars, astronomers developed a coordinate system to indicate the positions of stars on the celestial sphere. This coordinate system is very similar to the latitude and longitude coordinates commonly used on Earth. This coordinate system divides the celestial sphere into declination and right ascension.

The declination is calculated from 0 degrees at the celestial equator, +90 degrees north to the north pole, and -90 degrees south to the south pole. The right ascension is different from the calculation of the earth's longitude (from -180 degrees to +180 degrees), the right ascension is from 0 hours to 24 hours from west to east at the celestial equator, that is, the 360 degrees of the week are divided into 24 equal parts, and it can be known that 1 hour is equal to 15 degrees. Like time, the right ascension can be divided into 60 minutes per hour, and each minute can be subdivided into 60 seconds.

In addition, the minutes and seconds here refer to the hours, minutes, hours, and seconds, which are different from the traditional arc minutes and arc seconds, 1 hour and minute = 15 arc minutes, and 1 hour and second = 15 arc seconds. The starting point for calculating the right ascension is the vernal equinox, which is the position of the Sun at the vernal equinox (around March 21) each year. Like a spinning top, the Earth's axis of rotation is not fixed in space, but rotates in a 26,000-year cycle, known as precession, so the equinox and the celestial north pole also move very slowly.

Therefore, when we use celestial coordinates to indicate the position of celestial bodies, we should also indicate the coordinates of the year, such as the year AD.

1. Vernal equinox.

2 East Point and West Point.

The diameter of the Sun is.

km, the diameter of the earth only.

km, so the diameter of the Sun is about 109 times the diameter of the Earth.

i.e. r too r = 109

According to the volume formula of the sphere.

v=4πr^3/3

So v too v = (r too r) 3 = 109 3 = 1295029 so the volume of the sun is about 1.3 million times that of the earth.