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For many years, historians and poets have been fascinated by the green color that appears when the eyes of different animals get into contact with light at night. Unlike human beings, animals’ eyes tend to glow when illuminated at night. Jenkins indicates that the occurrence is caused by a layer...
Supernovae are a stage in the evolution of stellar objects, which ends with a bright explosion of the star, and the object ceases to exist. The explosions of supernovae are divided into two main types – type I and II. According to Thompson, they are distinguished by the presence or...
Some of the gas-dust clouds are so dense that they begin to contract under the influence of their own gravity. According to Drake et al., as the compression increases, the density and temperature of the cloud increase, and it begins to emit abundantly in the infrared spectral range, forming a...
In the interstellar medium, there is a continuous counteraction between two tendencies – compression and expansion. The compression of the cloud is facilitated by its own gravity and external forces, for example, the explosions of neighboring stars. The expansion is developed due to the pressure of the gas and magnetic...
The most famous visual tool in astronomy is the Hertzsprung-Russell diagram. This mechanism shows the dependence of luminosity with respect to the spectral class of the star, starting from high and blue-white stars on the left side of the diagram to the low temperature indicated by red stars on the...
Solar energy is an inexhaustible and safe source of power. However, some negative factors of the influence of the star’s activity on the Earth and its inhabitants can be manifested. In particular, these are magnetic storms that can affect people’s health, glacial periods that occurred on the earth many thousands...
The central part of the Sun’s internal structure is its core, where a nuclear reaction of the conversion of hydrogen into helium takes place. In the course of these changes, energy is released, which is ultimately emitted from the surface of the Sun in the visible region of the spectrum....
The Milky Way is studied in more detail than Andromeda. As for both galaxies, astronomers know the approximate number of stars and geometric dimensions. The future of these two galaxies is not very encouraging. The Andromeda galaxy is moving slowly towards the Milky Way. The Milky Way will collide with...
The Hubble sequence is an old classification of galaxies but is still relevant. The Hubble sequence is used in professional astronomical research and amateur astronomy. The main remark about the Hubble sequence is that it does not fully cover the variety of galaxies. Also, the sequence does not take into...
The Andromeda galaxy is Sb in the Hubble sequence; the Milky Way galaxy is SBbc. The selected galaxy Size Composition Structure History Galaxy Milky Way Diameter: 30,000 pc; Thickness: 1000 light years. Contains stars, constellations, gas and dust. Spiral-shaped, with a black hole in the middle. In the 18th century,...
First, about the form: elliptical galaxies have an oval shape. More than half of all existing galaxies are spiral galaxies. The rest can be attributed to galaxies of irregular shape. Core and branches: elliptical galaxies have no central nucleus and spiral branches. Spiral galaxies have nuclei and branches consisting of...
The caskets with the bodies of the three deceased employees were covered with lead and a thick layer of concrete in order to reduce the radiation background in the burial area due to an extremely long half-life of the isotope uranium-235.
A fission reaction is a nuclear fusion process aimed at generating energy. To absorb a neutron, a special isotope, uranium-235, is applied.
a. λ=hc/E, where λ=wavelength of X-ray produced, h=planks constant, E=energy (eV) e is electron charge, c=velocity of light.b. (1) shorter wavelength, (2) intensity increases.
Pyroclastic material often appears during (or rather is a result of) a volcanic eruption. It consists of volcanic rock, ash, lava, and gases. These materials come in a cloud or a flow. The flow and the cloud are very hot and cause a lot of damage to people and areas...
The content of silica in magma affects its viscosity. Thus, if the content of silica increases viscosity of magma also becomes higher. This process is associated with the high melting point of this compound.
Tsunami is a large amount of water that moves to the land. An earthquake that occurs in the ocean, as well as a big lake, makes large volumes of water move. A tsunami is often a series of huge waves.
First difference is that P waves are faster than S waves.Secondly, S wave “involves oscillation perpendicular to the direction of propagation,” while P waves are characterized by compressional motion.Thirdly, P waves can travel through liquid, whereas S waves cannot do this.
The Big Bang theory postulates that the Universe later expanded rapidly. The theory is supported by various pieces of evidence: for instance, the expansion, its early hot state, helium, and galaxy formation are derived from various cosmological models, including cosmic microwave background, Hubble diagram (type la supernovae), availability of light...
Stellar Parallax describes the movement of a star against other more distant stars during the revolution of the Earth around the Sun. The concept can be used to determine the distance of a few stars that are close to the Sun. Mathematically, the distance to a star in parsecs will...
The answer is spectroscopy. Explanation: Spectroscopy is concerned with the exploration and analysis the electromagnetic spectrum of light. The electromagnetic spectrum is the term used to describe the variety of frequencies of electromagnetic radiation. Different wavelengths of electromagnetic waves produce various colors. Some of these colors can be seen by...
The correct answer is C. An incandescent light bulb produces a continuous visible spectrum. Explanation: Visible light spectrum is the term used to define the range of wavelength that can be discerned by the human eye. However, the vast share of electromagnetic waves are invisible to humans. Below is the...
Correct answer is B. A real object has a positive object distance. Explanation: The lens equation is an important topic in physics and optics because it allows quantifying the relationship between an object and an image. There are three key concepts involved in a lens equation: object distance, image distance,...