Scientists have identified seven new "dark comets," doubling the known population of these unusual celestial objects to 14. Dark comets are fascinating hybrids: they look like asteroids but behave like comets by accelerating unexpectedly, possibly due to gas jets escaping from their surfa...
comets : general-comets : individual (Hale-Bopp 1995 O1Optical observations were made at Ramfjord, Norway from January 10 to February 14,1997. Two types of Fabry-Perot interferometers (FPIs), Doppler-imaging and scanning, were installed at the EISCAT radar site and were used to acquire data...
The new theory has been advanced largely by astronomers and remains largely unknown by archaeologists (notable exceptions include Professor Baillie of Belfast and Dr. Euan Mackie in Glasgow). The theory postulates that the disasters were caused by the impact of comets or other types of cosmic ...
Which of these species will have pure vibrational spectra? For those that do not, state the reason. (a) CO_2 (b) H_2 (c) NaCl(g) (d) SO_3^(2-) (e) S_2 (a species detected in the tails of comets) What are th...
The mechanism of comets and planets formationconsequences for the planetsforming themThe article considers the questions, arising during rendezvous of two celestial bodies with equal mass, one of which is the Earth and the consequences of such rendezvous to modern civilization, suggests the idea of...
The chemicals found around the protostars may mirror the early history of our solar system, allowing astronomers a way to look back at what was present when the sun and the planets that orbit it, including Earth, were forming. "All of these molecules can become part of comets and asteroids...
In any given year, about a dozen known comets come close to the sun in their orbits. The average person can't see them all, of course. Usually there is only one or two a year bright enough to be seen with the(34)eye. Comet Hale-Bopp, discovered in 1995, was an unusually bright ...
What is the origin of this phenomenon? State Hooke's law. How can it be derived on the basis of interatomic forces? Which of the following phenomena is due to the electric interaction? Select all that apply. a) surface tension in water b) the ellipt...
Another interesting point is that the SCGE assay was described as relatively insensitive since positive results (no scored comets) would not be found when the tested compounds are highly cytotoxic [93]. However, despite the fact that beverages were cytotoxic in our study, this cytotoxicity assay ...
Comets can move in an elliptical orbit. Halley found in 1705 that the comet, which is now called after him, moved around the sun in an elliptical orbit. Its orbit is close to a parabola, having an eccentricity of about 0.9675. On a much smaller scale, the atom, one sees electrons ...