The origins of the never-seen stars on the outskirts of our Galaxy are causing problems for galactic researchers.
The edge of the galactic disc is a complicated place, with the Milky Way’s own stars mixed with the remnants of myriad tiny satellites, ripped apart and consumed by our Galaxy’s gravity. A new paper by an international team uses data from the Sloan Digital Sky Survey to take a look at what might be just such a remnant, a structure known as Triangulum-Andromeda after the part of the sky in which it’s located.
この記事は BBC Sky at Night Magazine の November 2017 版に掲載されています。
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この記事は BBC Sky at Night Magazine の November 2017 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
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Could We Find Aliens by Looking for Their Solar Panels?- Designed to reflect ultraviolet and infrared, the panels have a unique fingerprint
Researchers searching for life beyond Earth spend a lot of time thinking about what telltale signs might be detectable astronomically. Forms of unambiguous evidence for the presence of life on another world are known as biosignatures. By extension, techno signatures are indicators of activity by intelligent, civilisation-building life.
Antimatter- In our continuing series, Govert Schilling looks at antimatter, the strange counterpart to most of the matter filling our Universe
Particles and corresponding antiparticles are very much alike, except they have opposite electrical charges. For instance, the antiparticle of the electron - known as the positron - has the same tiny mass, but while electrons carry a negative electrical charge, positrons are positively charged.
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The Big Bang produced a Universe filled almost exclusively with hydrogen and helium; all other elements - what astronomers call metals - were produced by stars, supernovae and everything that happens later. So if you can pick out a pristine star with no metals polluting it from among the billions in the Milky Way, then you are likely to have a star dating from our Galaxy's earliest days.
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