Five space-science updates from July 20–27, 2026, with the evidence level kept in view.

An international team using ESO's Very Large Telescope reports the first plausible detection of an exosatellite in the CD-35 2722 system. A star hosts a brown dwarf, and a planetary-mass object appears to orbit that brown dwarf. Tiny radial-velocity wobbles are the evidence. The label is still unsettled: "exomoon" is a useful shorthand, not a final classification. 1

Why it matters: If follow-up observations hold up the interpretation, planetary systems may be more varied than the familiar planet-around-a-star arrangement. Takeaway: plausible detection, not confirmed exomoon.

ETH Zurich researchers used high-resolution 3D models to study Venusian rift valleys. Young rifts produce wide, raised flanks that resemble features in 1990s Magellan images; the models put their spreading rate at roughly 3–10 centimetres per year. That points to recent or possibly continuing geological activity, but it is not a direct measurement of motion today. 2

Why it matters: Venus may be a more internally active world than its apparently quiet surface suggests. Takeaway: the evidence is a model–observation match, not a live seismic reading.

A Caltech model, reported by ScienceDaily on July 20, proposes that an ageing Sun-like star can eject gas in uneven blobs. Each burst gives the star a tiny reaction push; roughly 10,000 such kicks could add up to about 1 kilometre per second. The proposed motion could loosen wide binary systems or, in some cases, help drive stellar collisions. 3

Why it matters: Stellar death changes more than a star's mass and brightness. It can also alter who remains gravitationally bound to whom. Takeaway: this is a proposed model submitted to a journal, not a direct survey of kicked white dwarfs.

A report from the Royal Astronomical Society's National Astronomy Meeting describes a possible turning point in the Sun's 11-year cycle. When active regions move below about 15° latitude and the strongest space weather drops away, the remaining sunspot pattern may offer clues about the next cycle. The method could give a forecast six to seven years ahead; an early estimate puts Solar Cycle 26 at roughly 100–120 sunspots, but the researchers say that estimate can still change. 4

Why it matters: Longer lead times would give space-weather planners more time to think about future solar activity. Takeaway: promising conference result, not yet a settled forecasting rule.

Soyuz MS-28 landed on July 26 with NASA astronaut Chris Williams and Roscosmos cosmonauts Sergey Kud-Sverchkov and Sergei Mikaev. The crew had spent 241 days in orbit, completing 3,856 Earth orbits and travelling more than 102 million miles. 5

Why it matters: This is an operations milestone rather than a new astronomical discovery, but safe return is part of keeping long-duration research in orbit possible. Takeaway: the station's science cycle continues through a successful crew handover.

The week's pattern is clear: two items are provisional interpretations, two are models or early forecasting signals, and one is a completed spaceflight event. The next step for the headline-making claims is follow-up data, not stronger wording.

Image note: the CD-35 2722 picture is an ESO artist's impression; the Venus image is a colour-coded geological map rather than a natural-colour photograph; and the stellar-kick visual is an illustration of a model, not an observation.

Sources are linked in each item so you can follow the evidence behind the takeaway.