Senior high school scientific papers 1500 words

Science is not the only way to know the world, but it is fair and consistent, and it is the most reliable practical method to explore the objective world. I sorted out the high school science and technology papers of 1500 words. Welcome to read!

High school scientific papers 1500 words

I meditated in the afterglow of the sunset. The wind is blowing in our ears and the sand is dancing in front of us. In the distance, my family quietly enjoys the comfort of the sunset. What a beautiful picture is this? As warm as a blooming carnation, as elegant as moonlight. I was moved by this, but I shed tears. Because I don't know whether such a beautiful tomorrow will reappear. Wandering, I always can't find the way to the sunshine. Tears blurred my eyes, and inexplicable fear clung to me. I can't escape, I can't break free. Although our family has struggled for thousands of years and never bowed to any hardships, this time it is unbearable for us? The endless hunting of human beings makes our huge group gradually disappear. A tired heart can't find its way. I want to know: why is this? My mother's beautiful face flashed before my eyes. I call her, calling her bright eyes can give us the answer. I remember that moment, the face of this beautiful girl in Hoh Xil, and the clear stream slowly flowing around her.

I was born in Hoh Xil, blessed by Kunlun Mountain. My mother licked me gently, the sun smiled in my eyes, the song of the grass spread far and far with the wind, my mother's kind eyes sparkled with joy, and excited tears flowed on my cheeks. I looked at this strange world with curious and naive eyes, full of curiosity and eager to know everything. I live next to my mother, so simple and beautiful!

However, everything was broken that day.

The ferocious face of human beings appeared in every corner of Hoh Xil, and the roar of bullets penetrated every grain of sand. After my mother hid me, she ran in the direction of sunset?

The noisy voice gradually disappeared, and I quietly poked my head out to look for the familiar figure. Everything is so quiet that it scares me. The air smelled of blood. I shouted:? Mom! Mom! There is no response, only Kunlun Mountain conveys my grief over and over again.

I ran in the direction of my mother's disappearance, hoping to get back to her before the night swallowed me up. Forget fatigue, forget hunger. I persisted, my sweat soaked me, and my shortness of breath made it difficult for me to support. I collapsed on the sand dune, the stars in the distance flashed, and sad tears came out of my eyes. I asked softly, Mom, where are you? Where are you?

When I woke up, I was already lying in the arms of my loved ones. They have blood on their horns and blood in their eyes.

? Come with me, son. ? An old Tibetan antelope said to me. I followed him in confusion and followed him up a mountain. The dim sunlight shines on us.

? Son, do you know why we Tibetan antelopes can withstand thousands of years of ups and downs?

I shook my head.

? After thousands of years in struggle for existence, Tibetan antelopes have developed strong limbs and delicate bodies. We are strong and running like flying, and our sharp horns are our pride. However, more importantly, we have a spirit, a will that will make us stand forever. Life is fragile, but when this spirit and this will are injected, life will stand like this majestic Kunlun Mountain. ? The firm voice echoed in the valley, as if my mother's kind face was smiling gently at me. I wiped the tears from the corner of my eyes, looked at the sunset in the distance and nodded hard.

I began to take wind and rain as my companion and ice and snow as my home. I firmly believe that my mother will always look at me. I firmly believe that the life watered with tears can withstand the wind and rain, and the body nurtured by my soul is like a snow lotus. I led this family and started our way of survival. We want to be the elves of Hoh Xil.

Bloody always bothers us, leaving us no chance to breathe. The weather in Hoh Xil is so heavy that I can't tell the way to go. What will be waiting for us? To perish, or to live? I began to hesitate, but my mother's figure was engraved in my heart, and the words of my elders echoed in my ears. I told myself: I can't give up! ? I can't let the appearance of Tibetan antelope become a memory. The rolling Kunlun Mountain is our backbone. No matter how difficult it is, we will bear it. The endless Hoh Xil is our soul. Faith is in our hearts. Will the Tibetan antelope family survive in Hoh Xil?

I woke up from meditation, and the red light of the sun embraced us. Mother's body turned into golden light in the sun and sprinkled on us.

I kissed Hoh Xil deeply on the cheek and took my family to the place where the sun rose.

Senior high school scientific papers 1500 words 2

A good helper to recognize stars? star chart

Before you are familiar with the star map, you should know something about the magnitude. As we all know, the brightness of stars is different, some are brighter and some are darker. Order of magnitude? To show the brightness of each star. The brightest star is 1, the barely visible star is 6, and there are 2, 3, 4 and 5 in the middle. The arithmetic difference of each star is 2.5 12 times, that is, the brightness of 1 is 2.5 12 times that of the second-class star.

Astronomers found through accurate measurement that the magnitude of most stars is not an integer, and the brightness of a few stars is greater than 1, so they are represented by numbers with decimal points and negative numbers. For example, the famous Vega is 0, the Altair is 0.8, Sirius-1.4, arcturus -0. 1 and so on. Venus can reach-

There are more than 6000 stars visible to the naked eye in the whole sky. However, when we observe the starry sky anywhere on the earth's surface at a certain moment, we can only see half of the sky, that is, we can only see about 3,000 stars above the horizon, and about 3,000 others are hidden below the horizon.

Just like drawing a map, drawing a map of the distribution of stars in the sky is called a star map. Star map is a necessary tool for us to identify stars. Open the star map and have a look, and you will find that the patterns of bright stars in some constellations are very beautiful When you see the shapes of these constellations, you will think of many wonderful and magical stories, which not only increases your interest in reading star maps, but also provides convenience for understanding constellations and their main bright stars. But the myth is not true after all. The stars contained in each constellation are not members of a family and have nothing to do with each other. The patterns and shapes we see are just their projections on the celestial sphere. All stories, people, animals, instruments and utensils do not exist. Only two constellations are special. One is the Big Dipper in Ursa Major, a relic of the same cluster. The other is Orion. Most stars are blue because they are young, hot stars. They are all located in the same region on the same spiral arm of the Milky Way, from which new stars are constantly born. Orion is like a huge nursery for newborn stars. Of course, there are many stars who have nothing to do with these young stars. The most prominent is its main star Betelgeuse, which should belong to this constellation, right? Parents? But in fact, it is only in the same sight as these young stars in Orion, and Betelgeuse is much closer to us. Betelgeuse is a typical old star.

There are many kinds of star maps. At present, the most detailed star map used by astronomers has drawn 23 stars, which is also the limit magnitude that can be seen by the largest telescope in the world, with more than 500 million stars all day. There are several kinds of star maps suitable for amateurs to observe the starry sky, such as activity star map, four-season star map and all-day star map.

Active star map is a very simple and convenient star map. It consists of two disks: a bottom plate and a top plate. The base plate can rotate around the center, with bright stars and constellations painted on it, and coordinates around the disk, indicating the month and date. The upper plate is divided into four directions: horizon, east, west, north and south, and the time is also marked around the plate. When in use, rotate the bottom plate so that the date on the bottom plate is aligned with the observation time on the top plate. At this time, the exposed part of the horizontal circular cut on the upper wall is the same as the starry sky that can be seen at that time. Hold the active star map above your head, so that the north-south direction of the star map is consistent with the north-south direction of the ground, and you can know the starry sky by comparing the star map.

The sky map of four seasons is to draw the starry sky of four seasons on four maps respectively. It is drawn according to the vertical projection of celestial bodies from the zenith to the ground, so all four star maps are circular. The edge of the circle represents the corresponding geographical latitude and the four directions of east, west, north and south. The center of the circle is at the top of the head, which is the zenith. The stars in the four seasons sky map are generally only drawn to level 3 or 4, and some larger maps may be drawn to level 5.

An all-sky map is a detailed map of the whole sky. This kind of star map is very necessary for those astronomy enthusiasts who are already familiar with the starry sky and intend to further observe binary stars, variable stars, nebulae, clusters and galaxies, or who are looking for new comets. This kind of star map is generally not available in the market, but interested readers can buy it at the Beijing Planetarium, which provides various star maps for astronomy enthusiasts all the year round.

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