Trump administration plans space-based missile defense system
The Trump administration will roll out a new strategy for a more aggressive space-based missile defense system to protect against existing threats from North Korea and Iran and counter advanced weapon systems being developed by Russia and China.
Lunar Eclipse Facts - Why Is It Red? How Often Does It Occur?
NASA explains how a lunar eclipse occurs and what skywatchers can expect. -- Supermoon Blood Moon Lunar Eclipse of 2019: Complete Guide:
The story of Super Massive Black Holes | 110 years worth of knowledge
At the centre of every galaxy, there is a supermassive black hole (a million to a billion times bigger than the Sun). But how do we even know that? There are so many scientific results that have jigsaw-pieced together throughout the past century that allow us to know that now, so join me, as I go through decade by decade and explain the significance of all the results that have built up the big picture.
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For those of you that like specific decades here are the timestamps:
1900s - 0:53
1910s - 3:58
1920s - 5:50
1930s - 6:58
1940s - 09:04
1950s - 11:00
1960s - 12:09
1970s - 17:14
1980s - 18:38
1990s - 19:40
2000s - 22:12
2010s - 23:28
And for those of you who like reading straight from the source, here are links to all the papers I mentioned throughout the video, again listed by decade (note that "et al." is Latin for "and others"):
Michell (1784) - https://royalsocietypublishing.org/doi/10.1098/rstl.1784.0008
Fath (1909) - http://articles.adsabs.harvard.edu/pdf/1909LicOB...5...71F
Einstein (1915) - https://en.wikipedia.org/wiki/List_of_scientific_publications_by_Albert_Einstein#/media/File:GeneralRelativityTheoryManuscript.jpg
Schwarzschild (1916) - https://commons.wikimedia.org/wiki/File:K._Schwarzschild_-_%C3%9Cber_das_Gravitationsfeld_eines_Massenpunktes_nach_der_Einsteinschen_Theorie_(1916).pdf
Lemaître (1927) - http://articles.adsabs.harvard.edu/pdf/1927ASSB...47...49L
Hubble (1929) - https://www.pnas.org/content/15/3/168
Einstein (1931; cosmological constant introduced) - http://echo.mpiwg-berlin.mpg.de/ECHOdocuView?url=/permanent/echo/einstein/sitzungsberichte/R583HGCS/index.meta&pn=1
Chandrasekhar (1931) - http://articles.adsabs.harvard.edu/pdf/1931ApJ....74...81C
Tolman (1939) - https://journals.aps.org/pr/abstract/10.1103/PhysRev.55.364
Oppenheimer & Volkoff (1939) https://journals.aps.org/pr/abstract/10.1103/PhysRev.55.374
Seyfert (1943) - http://articles.adsabs.harvard.edu/pdf/1943ApJ....97...28S
Bolton, Stanley & Slee (1949) - https://www.nature.com/articles/164101b0
Baade & Minkowski (1954) - http://articles.adsabs.harvard.edu/pdf/1954ApJ...119..206B
Burbidge (1959) - http://articles.adsabs.harvard.edu/pdf/1959ApJ...129..849B
Minkowski (1960) - http://articles.adsabs.harvard.edu/pdf/1960ApJ...132..908M
Giacconi (1962) - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.9.439
Hoyle & Fowler (1963) - http://articles.adsabs.harvard.edu/pdf/1963MNRAS.125..169H
Schmidt (1963) - https://www.nature.com/articles/1971040a0
Kerr (1963) - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.11.237
Salpeter (1964) - http://articles.adsabs.harvard.edu/pdf/1964ApJ...140..796S
Zel’dovich (1964) - https://ntrs.nasa.gov/search.jsp?R=19640015209
Schmidt & Matthews (1964) - http://articles.adsabs.harvard.edu/pdf/1964ApJ...139..781S
Schmidt (1965) - http://articles.adsabs.harvard.edu/pdf/1965ApJ...141....1S
Penrose (1965) - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.14.57
Hawking (1967) - https://www.jstor.org/stable/2415769?origin=ads&seq=1#metadata_info_tab_contents
Hewish, Bell et al. (1968) - https://www.nature.com/articles/217709a0
Lynden-Bell (1969) - https://www.nature.com/articles/223690a0
Lyden Bell & Rees (71) - http://articles.adsabs.harvard.edu/pdf/1971MNRAS.152..461L
Wolfe & Burbidge (1974) - http://articles.adsabs.harvard.edu/pdf/1970ApJ...161..419W
Bardeen, Carter & Hawking (1973) - https://link.springer.com/article/10.1007%2FBF01645742
Bekenstein (1973) - https://journals.aps.org/prd/abstract/10.1103/PhysRevD.7.2333
Balick & Brown (1974) - http://articles.adsabs.harvard.edu/pdf/1974ApJ...194..265B
Sargent et al. (1978) - http://articles.adsabs.harvard.edu/pdf/1978ApJ...221..731S
Dressler (84) - http://articles.adsabs.harvard.edu/pdf/1984ApJ...286...97D
Kormendy (88) - http://articles.adsabs.harvard.edu/pdf/1988ApJ...335...40K
Harms et al. (1994) - http://articles.adsabs.harvard.edu/pdf/1994ApJ...435L..35H
Miyoshi et al. (1995) - https://www.nature.com/articles/373127a0
Urry & Padovani (1995) - https://arxiv.org/pdf/astro-ph/9506063.pdf
Faber et al. (1997) - http://articles.adsabs.harvard.edu/pdf/1997AJ....114.1771F
Magorrian et al. (1998) - https://arxiv.org/pdf/astro-ph/9708072.pdf
Ferrarse & Merritt (2000) - https://arxiv.org/pdf/astro-ph/0006053.pdf
Gebhardt et al. (2000) - https://arxiv.org/pdf/astro-ph/0006289.pdf
Hopkins et al. (2006) - https://arxiv.org/pdf/astro-ph/0506398.pdf
Simmons, Smethurst & Lintott (2017) - https://arxiv.org/pdf/1705.10793.pdf
Martin et al. (2018) - https://arxiv.org/pdf/1801.09699.pdf
Dr Becky Smethurst is a Junior Research Fellow at Christ Church at the University of Oxford.
An Infinite Sea of Antimatter - Ask a Spaceman!
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Why is matter and antimatter symmetric? What happened in the early universe to make matter win? Do we have any clue as to why? What do puppies have to do with it? I discuss these questions and more in today’s Ask a Spaceman!
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Keep those questions about space, science, astronomy, astrophysics, and cosmology coming to #AskASpaceman for COMPLETE KNOWLEDGE OF TIME AND SPACE! Music by Jason Grady and Nick Bain.
New Shepard Flight History: Missions 1-9
The more we fly the better we get. Safety and reliability are paramount. Our rigorous test program with New Shepard is putting the vehicle through the paces. We have successfully completed several crew capsule escape tests showing that our astronauts will be safe in any phase of flight. In addition to our test program, our payloads program is driving more flights of the system as we iterate on operations and technology in preparation for human spaceflight. All the learnings from the New Shepard program are being flowed into New Glenn development as we scale up our capabilities to serve the orbital market. Visit us at www.blueorigin.com to learn more.