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The warming is "likely not connected with that of the Earth," says Jay Pasachoff. [44] One astronomer has speculated the warming may be a result of eruptive activity, but it is more likely Pluto's temperature is heavily influenced by its elliptical orbit. It was closest to the Sun in 1989 and has slowly receded since.
The lunar atmosphere is extremely thin and technically classified as an exosphere, meaning atoms do not collide with each other because their numbers are so sparse, in contrast to Earth's thick ...
The outermost part of the stellar atmosphere, or upper stellar atmosphere, is the corona, a tenuous plasma which has a temperature above one million Kelvin. [6] While all stars on the main sequence feature transition regions and coronae, not all evolved stars do so. It seems that only some giants, and very few supergiants, possess coronae.
Hydrogen is present throughout the exosphere, with some helium, carbon dioxide, and atomic oxygen near its base. Because it can be hard to define the boundary between the exosphere and outer space, the exosphere may be considered a part of the interplanetary medium or outer space. Earth's exosphere produces Earth's geocorona.
The mysterious dimming of a star had been attributed to an extraterrestrial civilization at one point but appears to have another explanation. NASA: Mysterious star’s unusual dimming likely due ...
The actual distance to the border of this cavity varies from 60 to 250 pc or more. This volume contains about 10 4 –10 5 stars and the local interstellar gas counterbalances the astrospheres that surround these stars, with the volume of each sphere varying depending on the local density of the interstellar medium. The Local Bubble contains ...
[clarification needed] One possible explanation of this concentration is the Hercules–Corona Borealis Great Wall. [8] [9] The wall has a mean size in excess of 2 billion to 3 billion parsecs (6 to 10 billion light-years). [5] Such a supercluster can explain the significant distribution of GRBs because of its tie to star formation.
The study of stars and stellar evolution is fundamental to our understanding of the Universe. The astrophysics of stars has been determined through observation and theoretical understanding; and from computer simulations of the interior. [100] Star formation occurs in dense regions of dust and gas, known as giant molecular clouds.