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Astrophysics
Astrophysics is the scientific discipline concerned with the events that are taking place on the grandest of stages; the universe. Questions about the formation and evolution of the planets, solar systems, stars, and galaxies found within the universe, as well as questions regarding black holes, cosmic rays, particle and nuclear astrophysics, nucleosynthesis, and magnetohydrodynamics should be directed here.
1,304 Questions
What is an astrophysics degree like?
Like any other science degree, it takes patience, hard work and a really good depth of understanding in the material.
Do stars have bacteria on them?
No. Even the thermophilic (heat-loving) bacteria we know that endures the highest temperatures (well over the boiling point of water) on Earth would not be able to endure the temperature of stars (our Sun's photosphere is about 6000K) - and there would be other survival considerations (such as aquisition of food, etc).
The word celestial comes from the same roots as heavens (or sometimes sky); usually a celestial event would usually be considered to be something that takes place beyond the earth's atmosphere. A celestial event might be something like an eclipse or occultation, a star going nova, a planetary transition, etc.
How does a black hole admit gamma rays?
Just like any matter, light or other electromagnetic waves (this includes gamma rays), if they happen to get within the black hole's event horizon, will just get absorbed, slightly increasing the mass of the black hole.
Yes you can, but, be prepared for a fight because the landlord can put a lock on your door with your contents inside. It's time to see a lawyer! No one should have to live in a place with black mold (extremely hazardous to your health.) Instead of fighting the issue try finding another place within your price range.
What are the parts of a black hole called?
Black holes do not have multiple parts like the Earth, or as far as we know. So far all we know is that there are two anomalies to a black hole. One is the initial rotation, and the second is the event horizon, which is inedible destruction.
How will the moon appear to an astronaut on the moon?
The moon would appear as a bright object in the sky, much like we see it from Earth. However, the lack of atmosphere would make the sky black, making the moon's brightness stand out more vividly. The lack of air and light pollution on the moon's surface would allow for a clearer and more detailed view of the moon than seen from Earth.
What is the difference between self-gravitation and hydrostatic equilibrium of celestial bodies?
Hydrostatic equilibrium basically means the object has a round shape - spherical if it doesn't spin quickly, in the form of an ellipsoid if it does.Self-gravitation is the mechanism that causes it. It means that all of the parts of the object attract one another.
What is an intermediate black hole?
An intermediate-mass black hole is one that has a mass somewhere between 100 and a million solar masses, i.e., larger than the stellar black holes, but smaller than the supermassive black holes. It seems likely that such holes should exist, but the observational evidence is not yet very firm.
An intermediate black hole is one whose mass is somewhere between that of a stellar black hole (a few times the mass of the Sun), and that of a supermassive, or galactic, black hole (millions or billions of times the mass of the Sun).
Since RADAR uses electromagnetic radiation, which travels at the speed of light and nothing can travel faster than the speed of light this can't be done.
Also RADAR and most other types of electromagnetic radiation cannot penetrate the crust of the earth. To get imagery of the earth's interior SONAR using very low frequency sound waves produced by natural earthquakes is needed.
The only type of electromagnetic radiation capable of penetrating the whole earth (and possibly forming images) is the very very high energy ultrahard gamma rays, but gamma rays of this energy would kill everything living anywhere on or in the whole earth in only a few seconds of exposure! The only possible known source of such gamma rays are nearby gamma ray bursters, but (luckily for us) so far the only gamma ray bursters observed are at cosmological distances.
Particles called neutrinos penetrate the earth easily and at more than 99.9% of the speed of light, but they are very difficult to detect and the solid materials of the earth are so transparent to neutrinos (the entire thickness of earth is more transparent to neutrinos than one inch of the best quality glass is to visible light) that no images could be made. Most of the neutrinos passing through the earth are produced in the sun as a byproduct of the nuclear fusion that powers the sun.
Who has gotinformation about black hole first?
The concept of black holes was first proposed by John Michell in 1783, followed by further development by Pierre-Simon Laplace in 1796. However, it was not until the 20th century, with the work of scientists like Albert Einstein and Karl Schwarzschild, that the modern understanding of black holes began to emerge.
In your solar system you have one sun nine?
In our solar system there is one Sun and eight planets. Formerly Pluto held a slot as the ninth planet - but in 2006 the IAU decided to reclassify it as something other than a true planet, thus reducing the count to eight.
Olymus mons largest mountain in solar system what planet are you?
Olympus Mons is located on Mars; at about three times the height of Mount Everest it is considered the second tallest mountain in the Solar System. The central peak of crater Rheasilvia on Vesta is slightly taller.
Which are the colleges offerring astrochemistry in India and abroad?
While several premier institutions offer courses at the PG level, astronomy/astrophysics are offered as one of the subjects in BSc at a handful of universities like Dr Babasaheb Ambedkar Marathwada University, Aurangabad, Shivaji University, Kolhapur, the University of Lucknow and the University of Chennai. The eligibility is class XII (Sc).
The study of cosmic sciences - astronomy, planetary science and astrophysics requires a sound base in mathematics and physics at the undergraduate level, so make sure you opt for either of these at the BSc level.
Astronomy and astrophysics are taught as special MSc programmes in the Physics or Mathematics departments in a number of universities. Here are some of the better ones:
Andhra University, Visakhapatnam 530003 - Course: MSc Space Physics (3yrs). Eligibility: BSc. Diploma in Space Science & Tech. Eligibility: MS (Phs)/MScTech with electronics.
MP Birla Planetarium, 96 Jawaharlal Nehru Rd, Kolkata 700071. Course: PG Diploma in Astronomy & Planetary Sciences.
Indian Institute of Astrophysics, Koramangala, Bangalore 560034. Course: PhD in Astronomy and Astrophysics, Post-doctoral Fellowships. (www.iiap.ernet.in).
JNTU College of Engineering, Hyderabad. Course: MSc (Tech) Space Physics).
National Centre for Radio Astrophysics, Tata Institute of Fundamental Research (TIFR), Pune & Bangalore Campus, (www.tifr.res.in/~gsch). Research Programmes in Astrophysics & Astronomy (Radio Astronomy & Astrophys, Theoretical Phys & Astrophys, Elig: MSc (Phy/ Astro/ Appl Math/ Physical Chem. BSc/ BE/ BTech with exceptional record can also apply. Selection: Written test & interview.
Osmania University, Centre for Advanced Study in Astronomy, Hyderabad 500007. Course: MSc (Astronomy). Eligibility: BSc (45% in the rel subj).
Punjabi University, Patiala 147002 (Punj). Course: PG Diploma in Space Sciences. Eligibility: MSc (Phys)/ BSc/ BE/ BTech (50%).
Inter-University Centre for Astronomy & Astrophysics, Ganeshkhind, Pune 411007 (www.iucaa.ernet.in). Course: MTech in Astrophysics; PhD in Astronomy, Astrophysics, Cosmology and Quantum Physics. PhD Astronomy & Astrophysics, Experimental and Theoretical Physics. Courses: PhD in Physics (including Theoretical and Observational Astronomy, Astrophysics, Physics in Biology, Plasma Physics & Technology, Earth & Atmospheric Sc and Space Sc)/ Mathematics/ Theoretical Computer Sc. Selection: JEST, Introductory Summer School in Astronomy & Astrophysics, Vacation Students' Programme, Refresher Course in Astronomy & Astrophysics for College and University Teachers.
Indian Institute of Science, Bangalore (www.iisc.ernet.in).
Birla Institute of Technology & Sciences (BITS), Pilani, offers a starry future for those who have completed their Master's in Physics, Mathematics, Chemistry, Geology or Astrophysics. Course: MPhil in Astronomy & Planetarium Sciences in collaboration with the BIAPS (Birla Institute of Astronomy & Planetarium Sciences), Kolkata. A PhD programme is also offered.
Is hubble flow faster than light?
Because the term 'Hubble flow' is more about a relationship between distance and velocity, it might not have meaning to describe the flow itself as having any particular speed. Hubble flow encompasses the observed expansion of matter in the universe; the further away a galaxy is, the faster it appears to be receding from us, measurable by the redshifting (Doppler effect). This would tend to imply that at the most extreme distances, galaxies may be receding from us at velocities approaching the speed of light, and would thus be redshifted into invisibility and become unobservable, thereby placing a boundary on the visible universe; however, this effect is difficult to detect due to the extreme distances involved.
Where do Bose Einstein Condensates occur naturally?
If gravastars exist, their event horizon would be surrounded by a thick layer of Bose-Einstein Condensate.
What is the relationship between a black hole and a neutron star?
Think of a black hole like the neutron star's big brother. When a star reaches the end of its life, it blows off its outer layer in a supernova and leaves behind a stellar remnant. The mass of the star, during its life, determines what is left behind by its death. For relatively low mass stars (such as our own star), the remnant is a white dwarf. Get much larger than about 1.4 times our own star's mass and you end up with a neutron star. The exact upper mass limit for neutron star formation isn't known for certain, but the estimate is something between 2 and 3 times our own star's mass. Above that, and the remnant core collapses into a black hole.
Who proposed that black holes can evaporate?
Stephen Hawking was the first scientist to suggest that the black holes evaporate. His theory of Black Holes emitting radiation, also termed as Hawking Radiation.Hawking radiation is black body radiation that is predicted to be emitted by black holes, due to quantum effects near the event horizon. It is named after the physicist Stephen Hawking, who provided a theoretical argument for its existence in 1974, and sometimes also after the physicist Jacob Bekenstein who predicted that black holes should have a finite, non-zero temperature and entropy. Hawking's work followed his visit to Moscow in 1973 where Soviet scientists Yakov Zeldovich and Alexei Starobinsky showed him that according to the quantum mechanical uncertainty principle,rotating black holes should create and emit particles. Hawking radiation reduces the mass and the energy of the black hole and is therefore also known as black hole evaporation. Because of this, black holes that lose more mass than they gain through other means are expected to shrink and ultimately vanish. Micro black holes (MBHs) are predicted to be larger net emitters of radiation than larger black holes and should shrink and dissipate faster.
In Hawking Radiation, Virtual particle pairs are constantly being created near the horizon of the black hole, as they are everywhere. Normally, they are created as a particle-antiparticle pair and they quickly annihilate each other. But near the horizon of a black hole, it's possible for one to fall in before the annihilation can happen, in which case the other one escapes as Hawking radiation.
Is solar corona the fifth state of matter?
yes solar corona is the fifth state of matter. some say that filaments are the fifth but it is also true. filaments are just in solar coronas and is positively charged. i know its a plain answer but it wraps up to pretty much that.
Consider the statement There's no gravity in space true or false?
False. There is gravity in space. However, there are sections of space far away from any mass that will have no gravitational forces. So really, it depends on where you are in space (how close to a body of mass you are) whether there will be gravity or not.
What characteristic of black holes prevents them from releasing any light?
It enormous mass, and small size, will cause a tremendously strong gravitational field. This will distort space and time in such a way that nothing (including light) can get out.
Where can you find sheet music to supermassive black hole by muse?
http://www.musicnotes.com/images/productimages/mtd/MN0072494.gif
Where is the largest black hole in the universe and how big?
The largest black hole known is located in the center of galactic cluster PKS 0745-19, which is about 1,300,000,000 lightyears from Earth. This black hole has an approximate upper mass of 40,000,000,000 solar masses, where 1 solar mass is the mass of the Sun.
If placed in the center of the Solar System, its event horizon would reach just past Sedna, about 789au (1 au is about the distance frm Earth to the Sun, or 149,597,871 kilometers).
What are the random holes in Destroy All Humans 2?
In "Destroy All Humans 2," the random holes scattered throughout the game serve as locations where power-ups can be found. Players can explore these holes to discover hidden items or collectibles that can enhance their abilities and gameplay experience.
