EXPLOREMY LIBRARY
Science
BBC Sky at Night

BBC Sky at Night April 2019

Sky at Night magazine is your practical guide to astronomy. Each issue features the world’s biggest and best night sky guide complete with star charts, observing tutorials and in-depth equipment reviews to ensure that amateur astronomers never miss those must-see events.

Country:
United Kingdom
Language:
English
Publisher:
Immediate Media Company London Limited
Frequency:
Monthly
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12 Issues

in this issue

1 min.
welcome

2YHU›WKH››UVW›ZHHN›RI›)HEUXDU\›ZH›UDQ›RXU›LQDXJXUDO›%DFN›*DUGHQ› Astronomy Week – helping newcomers to astronomy discover the night sky with one simple thing to observe each night. I’m pleased to tell you it was a resounding success: over 9,000 people signed up to receive the daily email bulletins. If you’re interested in seeing more of what the cosmos has to offer, WKH››UVW›SDUW›RI›RXU›QR›QRQVHQVH›JXLGH›WR›EX\LQJ›D›WHOHVFRSH›RQ›SDJH› 35 is essential reading. Author Tim Jardine has been around telescopes IRU›PDQ\›\HDUV›DQG›KDV›H[SHUW›DGYLFH›WR››QGLQJ›DQ›LQVWUXPHQW›WKDWsV› right for you, whether you’re after a system that’ll show you distant galaxies at the touch of a button, or want to take in the wonders of the Solar System with your family. Capturing the Solar System on camera is a delicate matter: we have to contend with the blurring effects of the atmosphere above us. Using the right equipment and techniques, though, it is…

1 min.
sky at night – lots of ways to enjoy the night sky…

Television Find out what The Sky at Night team will be exploring in this month’s episode on page 17 Online Visit our website for reviews,competitions, astrophotos, observing guides and our forum Facebook All the details of our latest issue, plus news from the magazine and updates to our website Podcast The BBC Sky at Night Magazine team and guests discuss the latest astro news iPhone/iPad Get each month’s issue on your iPad or iPhone, now with bonus image galleries eNewsletter The best targets to observe each week, delivered direct to your inbox: bit.ly/sky-enews…

1 min.
this month’s contributors

Pippa Goldschmidt Astronomy writer A quest for exoplanets – and much more. Pippa reviews Nicholas Mee’s The Cosmic Mystery Tour on page 94 Steve Owens Dark skies consultant As dark skies become more sought after, Steve advises KRZ›EHVW›WR››QG›DQG› protect them. See page 60 Tim Jardine Amateur astronomer & ›\RXU››UVW›VFRSH› KRRVLQJ needn’t be a daunting process. Turn to Tim’s guide on page 35 for essential tips Elizabeth Pearson News editor See page 10 for new discoveries about gravity on Mars, and the size of Earth’s atmosphere…

3 min.
reclaim the night

ANDREW WHYTE, WEST SUSSEX, AUGUST 2014 Ask any astronomer what frustrates them most about the hobby and light pollution will be high on the list. Whether it’s the skygkow from a nearby FLW\›RU›WKH›JODUH›RI›VLQJOH›EULJKW›XQLW››DUWL›FLDO›OLJKW› limits how many stars we see in the night sky. In these three images all taken at f/2.8 and ISO 2500, astrophotographer Andrew Whyte has used different exposures to demonstrate the effects RI›OLJKW›SROOXWLRQ››7KH››UVW›SLFWXUH››WRS›OHIW››ZDV› H[SRVHG›IRU›WKH›LOOXPLQDWHG›VWUHHWOLJKWV›››››Š››DQG› demonstrates how bright lighting robs the night of VWDUOLJKW››7KH›QH[W››WRS›ULJKW››ZDV›H[SRVHG›IRU›WKH› 0LON\›:D\››››Š››ZLWK›VWUHHWOLJKWV›RQ››GHVSLWH›VWDUV› being visible, they are drowned out by glare. When the streetlights were switched off at 1am, $QGUHZ›FDSWXUHG›WKH›VFHQH›ZLWK›DQRWKHU››››VHFRQG› exposure. The striking difference is visible in the image on the page opposite, where the Milky Way is seen extending down to the rooftops. The three LPDJHV›VKRZ›FOHDUO\›WKH›HIIHFW›WKDW›OLPLWLQJ›DUWL›FLDO› light has on the visibility of the stars. 2Q››››0DUFK›DW›››››››SHRSOH›DURXQG›WKH›ZRUOG› ZLOO›EH›VZLWFKLQJ›RII›WKHLU›OLJKWV›IURP›››››SP› XQWLO›››››SP›IRU›(DUWK›+RXU››DQ›DQQXDO›FDPSDLJQ› demonstrating the…

1 min.
earth’s atmosphere envelops the moon

Earth’s atmosphere is far bigger than we realised, H[WHQGLQJ›RXW›EH\RQG›WKH›0RRQ››7KH›FORXG›RI› hydrogen that surrounds our planet, known as the JHRFRURQD››UHDFKHV›RXW›WR››››››››NP›S›DOPRVW›WZLFH› WKH›GLVWDQFH›WR›WKH›0RRQ›S›DFFRUGLQJ›WR›D›QHZ› DQDO\VLV›RI›PHDVXUHPHQWV›WDNHQ›RYHU››››\HDUV›DJR› 7R›XQFRYHU›WKH›IXOO›H[WHQW›RI›WKH›(DUWKsV›DWPRVSKHUH››D› WHDP›RI›DVWURQRPHUV›H[DPLQHG›LPDJHV›RI›(DUWK›WDNHQ› E\›WKH›6RODU›DQG›+HOLRVSKHULF›2EVHUYDWRU\››62+2›› EHWZHHQ››››››DQG›››››››7KH\›ORRNHG›DW›D›VSHFL›F› ZDYHOHQJWK›RI›XOWUDYLROHW›OLJKW››FDOOHG›/\PDQ›DOSKD› OLJKW››ZKLFK›VLJQL›HV›WKH›SUHVHQFH›RI›K\GURJHQ››7KH›VL]H› of the cloud has gone unnoticed due to its low density S›DW›WKH›GLVWDQFH›RI›WKH›0RRQ››\RX›ZRXOG›KDYH›WR›ORRN› DW››YH›FXELF›FHQWLPHWUHV›RI›VSDFH›WR››QG›MXVW›RQH›DWRP› 7KH›H[WHQGHG›DWPRVSKHUH›SRVHV›QR›ULVNV›WR›IXWXUH› VSDFH›IDUHUV››HLWKHU›KXPDQ›RU›URERWLF››DV›OHYHOV›RI› XOWUDYLROHW›UDGLDWLRQ›IURP›LW›DUH›PLQLPDO››EXW›LW›FRXOG› VWLOO›LQWHUIHUH›ZLWK›VSDFH›EDVHG›REVHUYDWRULHV› “Space telescopes observing the sky in ultraviolet ZDYHOHQJWKV›WR›VWXG\›WKH›FKHPLFDO›FRPSRVLWLRQ› of stars and galaxies would need to take this into DFFRXQW›Š›VD\V›-HDQ›/RXS›%HUWDX[››IURP›WKH›)UHQFK› 1DWLRQDO›&HQWUH›IRU›6FLHQWL›F›5HVHDUFK››ZKR›WRRN› part in the investigation. The discovery could also help in the search for KDELWDEOH›SODQHWV›EH\RQG›(DUWK››,Q›RXU›RZQ›6RODU› 6\VWHP›››QGLQJ›K\GURJHQ›DURXQG›D›SODQHW›LV›DQ› indication that there is water vapour nearer the planet’s surface. “This is especially interesting when looking for planets with potential reservoirs of water beyond RXU›6RODU›6\VWHP›Š›VD\V›%HUWDX[› http://sci.esa.int/soho/…

1 min.
comment

Old data can tell us new stories. This result uses data IURP›62+2sV›\RXWK› LQ›WKH›››››V››EXW› WKH›PRVW›IDPRXV› observations of the geocorona go back further than that. As part of the $SROOR››››PLVVLRQ›› astronauts John Young and Charlie Duke deployed the ›UVW›WHOHVFRSH›RQ› the lunar surface in ››››››,W›KDG›RQO\›D› WKUHH›LQFK›DSHUWXUH›› but was equipped ZLWK›D›FDPHUD›WKDW› was sensitive to the VDPH›XOWUDYLROHW› wavelenghts that SOHO would look at. The astronauts had to point the telescope by hand – not easy in a spacesuit. Once the ›OP›ZDV›SURFHVVHG›› the results included a shot of the Earth’s geocorona glow, a feature we now know extended to engulf the astronauts as they stood on the lunar highlands. Chris Lintott co-presents The Sky at Night ESA, NASA/JPL-CALTECH, JAXA, JAXA/UNIVERSITY OF TOKYO/KOCHI UNIVERSITY/RIKKYO UNIVERSITY/NAGOYA UNIVERSITY/CHIBA INSTITUTE OF TECHNOLOGY/MEIJIUNIVERSITY/UNIVERSITY OF AIZU/AIST…