This image may look like a scary eyeball, but it`s actually a fog! NASA`s Spitzer Space Telescope captured this image of the Helix Nebula, located in the constellation Aquarius, about 700 light-years from Earth. Credit: NASA /JPL-Caltech/Univ. Nebulae are usually made of hydrogen and helium, as they are the most common and stable compounds in the universe. The formation of a nebula can occur when a star undergoes a significant change, such as. B excessive fusion in its core. Visible light nebulae can be divided into emission nebulae that emit line spectral radiation from excited or ionized gas (usually ionized hydrogen); [24] They are often referred to as regions (H II, H II refers to ionized hydrogen) and reflective nebulae, which are visible mainly because of the light they reflect. It is not only the brightest nebula in our sky, but also the most active star-forming region in our galaxy. This nebula can be easily observed up close with a small telescope. It occupies an area twice as long as our full moon. The space is big! Science is cool! So let`s talk about it. Although the center is currently closed, we are still passionate about science and space exploration. In this series, we take a short tour of a scientific or spatial subject and give you an overview with some interesting images.
Today`s topic is all about fog. Hubble repeatedly observed the rest of the supernova nebula 1987A and observed how the rings and nodes of gas brighten around the exploded star. The observation of the supernova, which has been going on for decades, has led to a better understanding of how these events unfold over thousands of years. Although interstellar gas is widely dispersed, the amount of matter adds up over the huge distances between stars. And finally, and with enough gravitational pull between clouds, this matter can merge and collapse to form stars and planetary systems. Not all matter in the collapsing cloud ends up as part of a star – the remaining dust can become planets, asteroids, or comets. or it may remain in the form of dust. Scientists running three-dimensional computer models of star formation predict that rotating clouds of collapsing gas and dust can decay into two or three different spots. This would explain why the majority of stars in the Milky Way are paired or in groups of several stars. It was not until the 17th century and with advances in optics that nebulae were observed more strongly. In 1610, Nicolas-Claude Fabri de Pieresc discovered the Orion Nebula, observed by Johann Baptist Cysat in 1618.
However, the first detailed observations awaited the famous scientist Christiaan Huygens in 1659. Huygens, by the way, was also the first to develop a standard formula for centripetal force, which he published in 1659. So this is a big year for Huygens. In this image of the Carina Nebula, you can see tiny yellow and white dots in clouds of pink dust. These tiny dots are newly formed stars! NASA / JPL-Caltech / University of Colorado Planetary nebulae are the remnants of the last stages of stellar evolution for stars of medium mass (varying in size between 0.5-~8 solar masses). Evolved asymptotic giant stars eject their outer layers due to strong stellar winds, forming gaseous shells while leaving the star`s core in the form of a white dwarf. [24] Radiation from the hot white dwarf excites ejected gases and creates emission nebulae with spectra similar to those of emission nebulae in star-forming regions. [24] These are H II regions because most hydrogen is ionized, but the planets are denser and more compact than nebulae found in star-forming regions. [24] The Orion Nebula is a perfect example of a star-forming region or “star nursery.” A nebula is a huge cloud of dust and gas that occupies the space between stars and serves as a nursery for new stars. The roots of the word come from the Latin nebula, which means “fog, steam, fog, smoke, exhalation.” Mists are made up of dust, basic elements such as hydrogen and other ionized gases. They are formed either by clouds of cold interstellar gas and dust or by the consequences of a supernova. A nebula (Latin for “cloud” or “fog”;[2] pl.
Nebulae, Nebulae or Nebula[3][4][5][6]) is an independent body of interstellar clouds (which may consist of cosmic dust, hydrogen, helium, molecular clouds; possibly in the form of ionized gases). Originally, the term was used to describe any diffuse astronomical object, including galaxies beyond the Milky Way. The Andromeda galaxy, for example, was once called the Andromeda Nebula (and spiral galaxies in general as the “spiral nebula”) before the true nature of galaxies was confirmed in the early 20th century by Vesto Slipher, Edwin Hubble and others. Edwin Hubble discovered that most nebulae are associated with stars and are illuminated by starlight. It also helped categorize nebulae according to the type of light spectra they produced. [7] From time to time, a star explodes. It lacks hydrogen or helium, it gets too big, collapses and then explodes – don`t worry, our sun has still been stable for about 5 billion years. The resulting explosion emits matter and shock waves that can disrupt nebulae, causing them to form more stars. It is an ongoing process. Some deep sky objects combine different types of nebulae into one.
An excellent example of this type of object is the trifid nebula. There are a variety of formation mechanisms for different types of nebulae. Some nebulae form from gas already present in the interstellar medium, while others are created by stars. Examples of the first case are huge molecular clouds, the coldest and densest phase of interstellar gas, which can form due to the cooling and condensation of more diffuse gas. Examples of the latter case are planetary nebulae formed from matter dropped by a star in the later stages of its stellar evolution. One way to effectively photograph fog in the night sky is to use narrowband filters that isolate certain wavelengths of gas such as hydrogen. A filter like the Astronomik 12nm Ha clip-in fits into the camera body and can be used with telescopes or camera lenses. In 1610, Nicolas-Claude Fabri de Peiresc discovered the Orion Nebula with a telescope. This nebula was also observed in 1618 by Johann Baptist Cysat. However, the first detailed study of the Orion Nebula was not carried out until 1659 by Christiaan Huygens, who also believed that he was the first person to discover this nebula. [12] In the 17th century, improvements to telescopes led to the first confirmed observations of nebulae. It began in 1610, when the French astronomer Nicolas-Claude Fabri de Peiresc made the first recorded observation of the Orion Nebula.
In 1618, the Swiss astronomer Johann Baptist Cysat also observed the nebula; and in 1659 Christiaan Huygens made the first detailed study of it. .