53 Extreme ultraviolet imaging of three-dimensional magnetic reconnection in a solar eruption.

52 Earth-like aqueous debris-flow activity on Mars at high orbital obliquity in the last million years.

51 A primordial origin for the compositional similarity between the Earth and the Moon.

50 Explosive lithium production in the classical nova V339 Del (Nova Delphini 2013).

49 The morphological diversity of comet 67P/Churyumov-Gerasimenko.

48 The organic-rich surface of comet 67P/Churyumov-Gerasimenko as seen by VIRTIS/Rosetta.

47 Evidence for basaltic volcanism on the Moon within the past 100 million years.

46 A supermassive black hole in an ultra-compact dwarf galaxy.

45 Analysis of the Moon's topography reveals that when its largest basins are removed, the lunar shape is consistent with processes controlled by early Earth tides, and implies a reorientation of the Moon's principal shape axes.

44 Isotopic oxygen measurements suggest that the Moon comprises material distinct from Earth’s mantle.

43 The saturnian moon is differentiated and likely hosts a regional subsurface sea at its southern pole.

42 Observations of an extreme storm in interplanetary space caused by successive coronal mass ejections.

41 Observations of a protostellar envelope and disk (from which planets should form) in the relatively close star-forming region of the Taurus molecular cloud reveal unexpected chemistry in the gas between the envelope and the disk: the unsaturated hydrocarbon molecule cyclic-C3H2 and sulphur monoxide.

40 Discovery of the action of a geophysical synchrotron in the Earth’s Van Allen radiation belts.

39 A uniform iron abundance in the intracluster gas of the Perseus cluster suggests that the metal enrichment of the intergalactic medium occurred before the cluster formed, probably more than ten billion years ago, rather than after the cluster formed.

38 How Safe Is Safe Enough? Radiation Risk for a Human Mission to Mars.

37 Supervolcanoes within an ancient volcanic province in Arabia Terra, Mars.

36 In Situ Observations of Interstellar Plasma with Voyager 1.

35 Volatile, Isotope, and Organic Analysis of Martian Fines with the Mars Curiosity Rover.

34 Soil Diversity and Hydration as Observed by ChemCam at Gale Crater, Mars.


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