Fifteen Eighty Four


Tag Archives: Astronomy

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  • 16 Feb 2021
    David Merritt

    Evaluating An Alternative Cosmology

    David Merritt, author of PROSE Award winning book "A Philosophical Approach to MOND: Assessing the Milgromian Research Program in Cosmology” discusses the competing theories of MOND and LCDM ‘Suppose that the dark-matter detection experiments continue to fail. How can we hope to ever decide between the two competing theories?’

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  • 31 Jul 2020
    The robotic arm on NASA's InSight lander places a seismometer onto the surface of Mars.(credit: NASA/JPL-Caltech).
    Kenneth Coles

    Marsquakes may originate in a well-known fracture

    Reports of the first marsquakes – seismic events caused by crustal movement – aroused my interest. Recordings of earthquakes here on our own planet have taught us everything from the number and nature of layers in the interior to where the most active faults are located. The seismicity of the Earth contributed vital information that […]

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  • 9 Jul 2020
    Artist’s impression of Perseverance on the Martian surface.
    Wallace Arthur

    Mars: The nearest part of the biological universe?

    Author of The Biological Universe, Wallace Arthur, discusses what we can expect from the NASA Mars 2020 mission. The launch date is correct at time of publication.

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  • 29 May 2020
    Kenneth Coles

    Frost in Springtime: Seeing features on Mars

    Kenneth Coles, co-author of, The Atlas of Mars 2019, describes features on the Martian surface. Will you be able to spot the "Mountains of Mitchell" or the seasonal polar retreat this summer?

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  • 27 Nov 2019
    Geraint Lewis

    Video: Interview with ‘Cosmic Revolutionary’ Geraint Lewis

    Interview with ‘Cosmic Revolutionary’ Geraint Lewis from CUP Academic on Vimeo.   TRANSCRIPT: Geraint Lewis: I’m Geraint Lewis and I’m a professor of astrophysics at the University of Sydney and I am the author with Luke Barnes of A Cosmic Revolutionaries Handbook (or: How to Overthrow the Big Bang)   What reader did you have […]

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  • 23 Oct 2019
    Todd Timberlake

    Observing Transits of Mercury from 1631 to Now

    On November 11, 2019, observers will be able to see a rare sight: a transit of Mercury across the face of the Sun. Mercury transits are visible only about 13 times per century. Todd Timberlake, co-author of Finding our Place in the Solar System discusses the history of this rare sight.

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  • 24 Apr 2019
    Mitchell Begelman

    The First “Photograph” of a Black Hole

    The first image from the Event Horizon Telescope, centered on the nucleus of the giant elliptical galaxy M87, does not show the shadow of the black hole’s event horizon per se. What it does show is a region somewhat larger than the horizon, where spacetime is so distorted that photons can go into orbit around […]

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  • 23 Apr 2019
    Todd Timberlake

    A Multitude of Months: the many cycles of the Moon

    For most of us, a month is a page on a calendar, a set of 30, 31, 28, or, in rare cases, 29 days. But for an astronomer a month is a period of time associated with a cycle of the moon. It turns out that the moon has many cycles, and thus there are […]

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