@astronomynerd-blog
Astronomy Nerd

This is a blog dedicated to nerds out there, much like myself, that crave astronomy (: Astronomy photos, news, and videos will all be uploaded here. Have fun and I hope you learn something new! DISCLAIMER: All the pictures, videos, or information found on this blog are taken from NASA.gov, other bloggers, or other websites that I promise to cite. Enjoy! To stop the music, click that box below. Nerd(s)

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2103
Last update
2016-09-07 17:05:12
    anonymous

    Hi! I'm taking an intro to astronomy class this year, and I'm sorta nervous and I don't know what to expect. Do you have any tips or prior experience? Thanks!

    Hi there! I took intro to astronomy and it's really not bad, you just need algebra and basic math skills. It's a lot about trajectories and orbits, not as much concepts as I would prefer. The fact it's intro means it will be very simple in the beginning. Keep up with your homework and do practice problems! Don't be nervous, it's a great course to take and I'm sure you'll ace it.Love,An Astronomy Nerd

    Two key climate change indicators have broken numerous records through the first half of 2016, according to NASA analyses of ground-based observations and satellite data.

    Each of the first six months of 2016 set a record as the warmest respective month globally in the modern temperature record, which dates to 1880. Meanwhile, five of the first six months set records for the smallest monthly Arctic sea ice extent since consistent satellite records began in 1979.

    NASA researchers are in the field this summer, collecting data to better understand our changing climate.

    Read more: http://www.nasa.gov/feature/goddard/2

    anonymous

    What is it like to volunteer in an observatory?

    It really depends on your level of experience and who you work for.As a high school student at the Maria Mitchell observatory, I was assigned simpler tasks, like background research for my boss's field study. I was working around real college interns (usually junior or senior undergraduates) who got to use the telescopes and technology to conduct research.When I was employed at the Harvard Center for Astrophysics, I was mostly helping with crowd control. But after the public lecture, we take the audience up to the roof where coworkers and I have telescopes set up for them to look through, ask questions of us, etc.If anyone is interested in working at one, I advise you to just shoot an email to the director. Usually they have something for you, but be aware it'll be smaller tasks. You never know, I became the youngest Harvard employee at their CfA by just calling different observatories and asking.From,An Astronomy Nerd

    A ‘matryoshka’ in the interstellar medium

    As if it were one of the known Russian dolls, a group of astronomers, led by researchers at the Instituto de Astrofísica de Canarias, (IAC) has found the first known case of three supernova remnants one inside the other. Using the programme BUBBLY, a method developed within the group for detecting huge expanding bubbles of gas in interstellar space, they were observing the galaxy M33 in our Local Group of galaxies and found example of a triple-bubble. The results, which were published yesterday in the journal Monthly Notices of the Royal Astronomical Society, help to understand the feedback phenomenon, a fundamental process of star formation and in the dissemination of metals produced in massive stars.

    The group has been building up a data base of these superbubbles with observations of a number of galaxies and, using the very high resolution 2D spectrograph, GHaFaS (Galaxy Halpha Fabry-Perot System), on the 4.2 m William Herschel Telescope (WHT) of the Isaac Newton Group of Telescopes (Roque de los Muchachos Observatory, La Palma), has been able to detect and measure these superbubbles, which range in size from a few light years to as big as a thousand light years across.

    Superbubbles around large young star clusters are known to have a complex structure due to the effects of powerful stellar winds and supernova explosions of individual stars, whose separate bubbles may end up merging into a superbubble, but this is the first time that they, or any other observers, have found three concentric expanding supernova shells.

    “This phenomenon -says John Beckman, one of the co-authors on the paper- allows to explore the interstellar medium in a unique way, we can measure how much matter there is in a shell, approximately a couple of hundred times the mass of the sun in each of the shells”. However, if it is known that a supernova expels only around ten times the mass of the sun, where do the second and third shells get their gas from if the first supernova sweeps up all the gas?

    The answer to that must come from the surrounding gas and in the inhomogeneous interstellar medium. “It must be -says Artemi Camps Fariña, who is first author on the paper-, that the interstellar medium is not at all uniform, there must be dense clumps of gas, surrounded by space with gas at a much lower density. A supernova does not just sweep up gas, it evaporates the outsides of the clumps, leaving some dense gas behind which can make the second and the third shells”.

    “The presence of the bubbles -adds Artemi- explains why star formation has been much slower than simple models of galaxy evolution predicted. These bubbles are part of a widespread feedback process in galaxy disc and if it were not for feedback, spiral galaxies would have very short lives, and our own existence would be improbable”, concludes. The idea of an inhomogeneous interstellar medium is not new, but the triple bubble gives a much clearer and quantitative view of the structure and the feedback process. The results will help theorists working on feedback to a better understanding of how this process works in all galaxy discs.