First exomoon found? Astronomers optimistic but urge caution

Artist’s conception of a large Earth-like exomoon orbiting a giant gaseous exoplanet. Image Credit: Avatar/20th Century Fox

Exoplanets are being found so frequently now that they have become commonplace. But what about exomoons? As might be expected, they are much harder to detect, being typically much smaller than most planets. There have been tantalizing hints but nothing conclusive so far. That may be about to change soon, however. Astronomers from Columbia University have reported the possible discovery of the first exomoon – but they stress that it is still unconfirmed and just a candidate at this point.

Read MoreFirst exomoon found? Astronomers optimistic but urge caution

Bizarre Boyajian’s Star (‘alien megastructure’ star) is dipping again!

Artist’s concept of Boyajian’s Star with a huge swarm of comets. Image Credit: NASA/JPL-Caltech

The weird star called Boyajian’s Star (aka Tabby’s Star or KIC 8462852) has been fascinating astronomers and people in general because of its weird behaviour of experiencing sudden, unusual dips in brightness which all current theories have so far had difficulty explaining. Now, the star has started dipping again after a long period of “normal” activity.

Read MoreBizarre Boyajian’s Star (‘alien megastructure’ star) is dipping again!

NASA’s Kepler Space Telescope continues observations of TRAPPIST-1 planetary system

Artist’s conception of some of the planets in the TRAPPIST-1 planetary system. Image by ESO/M. Kornmesser/N. Risinger (skysurvey.org)

The seven Earth-sized exoplanets orbiting the star TRAPPIST-1 generated a lot of excitement when their discovery was announced last month. This is the largest collection of Earth-sized worlds in one planetary system found so far, and some of them are well within the star’s “habitable zone” where temperatures could allow liquid water to exist on their surfaces. Little else is known about the actual conditions on these planets so far, but NASA’s Kepler Space Telescope has also been observing TRAPPIST-1 in recent weeks.

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Kepler mission continues with campaign 11 observations after short delay

Graphic showing two full-frame images from Kepler. Modules 3 and 7 failed earlier during Campaign 10 and Module 7 failed later. Image Credit: NASA Ames/W. Stenzel
Graphic showing two full-frame images from Kepler. Modules 3 and 7 failed earlier during Campaign 10 and Module 7 failed later. Image Credit: NASA Ames/W. Stenzel

The Kepler K2 mission has now resumed after a delay of three days, NASA has reported. The Kepler Space Telescope is currently in Campaign 11, during which it is observing a total of 14,250 new targets, including the Galactic Center as well as two of Saturn’s moons, Enceladus and Titan.

Read MoreKepler mission continues with campaign 11 observations after short delay

10-part overview of enigmatic ‘alien megastructure’ star, by Jason Wright

Whatever is causing the weird dimming around the star isn't known yet, but theories have ranged from comets to "alien megastructures." Image Credit: NASA/JPL-Caltech
Whatever is causing the weird dimming around the star isn’t known yet, but theories have ranged from comets or dust to “alien megastructures.” Image Credit: NASA/JPL-Caltech

This is a great 10-part overview of Boyajian’s Star (Tabby’s Star/KIC 8462852) by astronomer and astrophysicist Jason Wright, outlining the various hypotheses to date to explain this weird star observed by the Kepler Space Telescope. Whatever is causing the unusual short-term and long-term dimming is still unknown.

Read More10-part overview of enigmatic ‘alien megastructure’ star, by Jason Wright