# How much energy does it take to destroy a planet?

BEIJING, May 8 (Xinhua) — From Alderaan to Kijimi, the monarchs of the Sith clearly like to blow the planet to pieces, according tomedia reports. So how powerful is the Doomsday weapon in Star Wars? In the movie “Star Wars: The Rise of Skywalker,” the final order wants to teach everyone in the galaxy a lesson. Then, at the command of the Galactic Emperor Palpatine, a Souce-like Starship launched a super-powerful beam from space, blowing up the Chikimi star. In Star Wars: The Rise of Skywalker, a Souceki star ship blasts a super-powerful beam from space, blowing up the Chikimi star

Are you wondering: How much energy does it take to blow up a planet? Of course, this is only an academic issue, and even if it is not true, it is still interesting to calculate.

Video Analysis of Planetary Explosions

First, we need to estimate how quickly the planet’s debris will go into space after it explodes. We can do this with a tracking video analytics application. The idea is to pick out specific clips from the movie and map their location in each frame of the video.

This position is measured in pixels, but we can scale it to a known object in the scene to convert it into distance. We can then get time data from the frame rate, in this case 24 frames per second. Assuming that the scene is shot at normal speed (i.e. not in slow motion), each frame represents 1/24 seconds. With location and time data, we can calculate the speed.

In order to correct the distance scale, the size of the Chikimi star itself will be used here. How big is the planet? No one knows, we assume that its radius is 1k, where K is the radius of The Chikimis. Yes, it may seem silly to define units by what we are measuring, but it has always been done in science (which is set to an “astronomical unit” before people know the actual distance between the Earth and the sun).

There is one more problem. We can only measure the speed at which objects move perpendicular to the camera (i.e. the picture plane). Why? Assuming a large piece of debris is slanted in the direction of the camera, it will move slightly to one side in each frame, making it slightly larger. But if you draw only the pixel position of the fragment, you underestimate the distance and speed it travels.

With this in mind, we can pick three pieces of debris that begin to spread outwards from the edge of the planet (as seen in the camera). The tracking application then gives a graph of how far the debris travels (the radial position of each object measured from the center of the planet) and time.

As you can see, they are basically straight-line motion, each straight line slope (position change/time change) is radial velocity, in K/s. The speed of green and blue objects is very similar, about 0.3K/s, and the red object starts at 0.24K/s and then drops to 0.08K/s. This can be software error; it’s hard to track objects in the field of view when a pile of things are flying around. Some fragments were also observed in a later photo and found to be at a speed of about 0.4K/s. Because different objects move at different speeds, 0.3K/s can be used as a rough average. The tracking application then gives a graph of how far the debris travels (radial position of each object measured from the center of the planet) and time

Fast or slow? Depending on the value of K, if the planet is as big as Earth, then K is 6.37 million meters. Using this to convert the velocity unit, the resulting planetary debris speed is 1.9 million meters per second. This is super-fast, but it’s still only 0.6% of the speed of light (300 million meters per second) (which is a good thing, because strange things happen when an object approaches the speed of light).

Of course, if the radius of the planet is greater than the radius of the Earth, the debris will be faster. Is that possible? In our solar system, the earth is the largest rocky planet on which people can walk. Planets like Jupiter are much larger, but they don’t have a solid rock surface, so they don’t eject rock fragments when they explode.

Outside the solar system, most known exoplanets are gas giants like Jupiter, with low densities that suggest they are not made up of rocks. However, scientists have also discovered a number of Earth-like planets. The largest of these is Kepler-20b, which has a radius of 1.87 times that of Earth. Measuring the video at this scale, the calculated debris can reach speeds of up to 3.5 million meters per second — still well below the speed of light.

How much energy does this require?

Now we can answer your question. Let’s start with three rough approximations. Suppose the planet is as big as Earth, with a radius of 6.37 million meters. We also use the mass of the earth, 5.972 x 10 x 24 kg, and assume that the density is uniform (which is certainly not the case).

Finally, we assume that all planetary debris is thrown at an average speed of 500,000 meters per second. This is much slower than the video measurements. Why slow down? Because the video is probably the fastest piece of debris, at the forefront of the explosion.

Based on this average velocity estimate, the total energy of the explosion, i.e. the kinetic energy (K) of all flying debris, can now be calculated (sorry, here is a K for two different things). This total kinetic energy is a function of m (the total mass of the planet) and v (average velocity of debris motion): Using the Earth’s mass and a lower estimate of the speed of debris (500,000 m/s), you can get 7.465 x 10 x 35 joules of energy. For example, if you grab a physics textbook from the floor and put it on the table, it takes 10 joules of energy. Imagine adding 35 0s after 10… That’s a big number.

How powerful is the weapon of the StarShip?

Power is defined as the rate at which energy changes, expressed in a formula that is: If the energy is in joules and the time is in seconds, the unit of power is watts. So let’s review the video and estimate how long it will take the Star Ship to send all this energy to Earth. Here, assume that the interval is about 10 seconds.

By the way, this is not a laser weapon, although Wookiepedia, an online encyclopedia that provides information about the fictional world of Star Wars, calls it a “super laser.” But if it’s a laser, it’s invisible. You can see laser beams on Earth because light is reflected by dust particles and other things, and in space, nothing scatters the beam, so nothing comes into your eyes. You’ll only see the planet explode.

In any case, the energy change over a 10-second period is 7 x 10 to 35 joules, which means that the power is 7 x 10 x 34 watts.

For comparison, you can imagine yourself taking advantage of all the radiation from the sun. It will be quite difficult because the sun is glowing in all directions. You have to put a huge spherical solar panel around the sun, like a Dyson ball. Assuming you can do so, the total output power of the sun will be 3.8 x 10 x 26 watts.

That’s right, which means that the adl is 100 million times more powerful than our sun.By E.M. In other words, the starships of the final order have hundreds of millions of solar energy. This is indeed a formidable opponent. But do you know what Han Solo would say? “Never tell me the chance.” (Any day)