The crew from Artemis II is readjusting to terrestrial routines, yet enthusiasm for their extraordinary mission persists. A fresh PBS film exploring the Artemis initiative and ongoing pushes to revisit the lunar surface is now available on YouTube. This period also featured NASA releasing striking visuals of a comet's solar plunge, the conservation group American Rivers issuing its yearly assessment of America's imperiled waterways, and the European Space Agency unveiling a retrospective photo of Martian terrain to underscore notable surface alterations. Below are the scientific developments that stood out recently.

In early April, a newly identified comet ventured near the sun but succumbed to the intense conditions. NASA distributed remarkable photographs from the April 4 event, depicting the comet disintegrating into particles while orbiting our star. As highlighted in a NASA online update, this marked the object's sole documented solar pass.

Designated C/2026 A1 or MAPS, the comet was initially detected on January 13 this year. During its solar proximity, it was monitored by various tools, including the NASA-ESA Solar and Heliospheric Observatory (SOHO), NASA's Solar Terrestrial Relations Observatory (STEREO), and NASA's Polarimeter to Unify the Corona and Heliosphere (PUNCH). These provided multifaceted perspectives of its trajectory. In a focused coronagraph image from SOHO, the comet seems to dive straight toward the sun. However, broader imagery from STEREO reveals it arcing tightly around the sun prior to fragmentation.

MAPS belonged to the Kreutz sungrazing comet group, and Karl Battams, lead for SOHO's coronagraph, indicated that its breakup probably happened hours ahead of its projected nearest solar point.

The environmental advocacy nonprofit American Rivers published its 2026 analysis of the nation's most at-risk rivers, spotlighting data centers as a critical factor for its leading concern. The group identifies the Potomac River as America's top-threatened waterway, facing risks from untreated wastewater via outdated pipelines and a dramatic rise in nearby data center construction.

The Potomac River watershed covers sections of Pennsylvania, Maryland, Virginia, West Virginia, and the District of Columbia. In January, a major rupture in the Potomac Interceptor sewer line in Montgomery County, Maryland, released hundreds of millions of gallons of raw sewage into the Potomac and the Chesapeake and Ohio Canal, elevating bacterial concentrations to more than 4,000 times the acceptable level for recreation near the spill site, per the analysis. That interceptor, exceeding 60 years in age, represents one of several regional pipes that have surpassed or reached their 50-year operational span, according to American Rivers.

Compounding these issues, the boom in data center projects across Virginia and Maryland is likely to pressure regional water supplies and power grids. Such installations may also exacerbate river contamination.

The analysis states that the area already hosts more than 300 data centers and anticipates reaching around 1,000, spanning approximately 200 million square feet—equivalent to 3,472 American football fields—across about 20,000 acres. These operations present an escalating danger to water purity and availability, often advancing without sufficient openness, oversight, or evaluation of combined environmental effects.

American Rivers urges Congress to renew funding for infrastructure improvements to modernize obsolete networks and presses state authorities to mandate disclosures on data centers' consumption of resources, plus thorough ecological reviews before permitting expansions.

This week, the European Space Agency presented evidence of transformations in a Martian zone since NASA's Viking probes imaged it in 1976. Recent shots from ESA's Mars Express orbiter illustrate how dark volcanic material has advanced over terrain in the Utopia Planitia region. A blog entry offers a comparative view of the images from both eras.

ESA describes this as an uncommon instance of detectable planetary surface evolution within a mere half-century. The agency suggests two potential causes for the ash expansion: transport via Martian gusts or removal of overlying reddish soil exposing the darker layer beneath.

The PBS documentary on Artemis II is accessible via YouTube.

The NAACP has filed a lawsuit against xAI regarding pollution from data centers.

A new research paper examines the detrimental effects of AI on cognitive function.