What is stellar and galactic astronomy?
The study of the sun and stars, their physical properties and evolution, interstellar matter, star clusters, our galaxy and other galaxies, the origin and evolution of the universe.
What is stellar galaxy?
A typical spiral galaxy has a faint, extended stellar halo. A stellar halo is an essentially spherical population of stars and globular clusters thought to surround most disk galaxies and the cD class of elliptical galaxies.
What stars is the center of the galaxy?
As we approach the center of the Galaxy, we find the supermassive black hole Sagittarius A*. There are also thousands of stars within a parsec of Sagittarius A*. Most of these are old, reddish main-sequence stars.
What is the speed of a star?
In the Milky Way, stars usually have velocities on the order of 100 km/s, whereas hypervelocity stars typically have velocities on the order of 1000 km/s. Most of these fast-moving stars are thought to be produced near the center of the Milky Way, where there is a larger population of these objects than further out.
What does Stellar mean in astronomy?
The definition of stellar is relating to the stars or excellent. An example of stellar used as an adjective is stellar light which means light from the stars. Relating to or consisting of stars. (astronomy, not comparable) Of, pertaining to, or characteristic of stars.
How much does a stellar astronomer make?
The median annual wage for astronomers was $119,730 in May 2020. The median wage is the wage at which half the workers in an occupation earned more than that amount and half earned less. The lowest 10 percent earned less than $62,410, and the highest 10 percent earned more than $189,690.
Why do galactic disks appear blue?
Harlow Shapley found the Milky Way was: much larger than previously thought. Galactic disks appear blue because: They believed that the Milky Way was the entire universe.
Can Milky Way galaxy be seen from Earth?
The Milky Way is visible from Earth as a hazy band of white light, some 30° wide, arching the night sky. In night sky observing, although all the individual naked-eye stars in the entire sky are part of the Milky Way Galaxy, the term “Milky Way” is limited to this band of light.
Does time stop at the speed of light?
The simple answer is, “Yes, it is possible to stop time. All you need to do is travel at light speed.” Special Relativity pertains specifically to light. The fundamental tenet is that light speed is constant in all inertial reference frames, hence the denotation of “c” in reference to light.
Can we travel to other galaxies?
The technology required to travel between galaxies is far beyond humanity’s present capabilities, and currently only the subject of speculation, hypothesis, and science fiction. However, theoretically speaking, there is nothing to conclusively indicate that intergalactic travel is impossible.
What are constellations in astronomy?
Constellation, in astronomy, any of certain groupings of stars that were imagined—at least by those who named them—to form conspicuous configurations of objects or creatures in the sky. Constellations are useful in tracking artificial satellites and in assisting astronomers and navigators to locate certain stars.
What is galactic astronomy?
Galactic astronomy is the study of the Milky Way galaxy and all its contents. This is in contrast to extragalactic astronomy, which is the study of everything outside our galaxy, including all other galaxies.
What is extragalactic astronomy?
Extragalactic astronomy is the branch of astronomy concerned with objects outside the Milky Way galaxy. In other words, it is the study of all astronomical objects which are not covered by galactic astronomy. As instrumentation has improved, distant objects can now be examined in more detail.
What is geological astronomy?
Geological Astronomy Defined. Geological astronomy, also called astrogeology , exogeology and planetary geology, is an interdisciplinary field that applies geoscientific principles to the study of extraterrestrial bodies and matter, including their history and composition.