Now is the time to catch Comet A3-Tsuchinshan-ATLAS at dawn.

Astrobiologists continue to search for their ideal biosignatures. A chemical or collection of chemicals that would give a clear indication of life on an exoplanet. The problem is that natural processes can produce all the same chemicals that life can generate. Now, researchers have produced dimethyl sulfide in the lab, a chemical made by marine microbes. They used light and gases found in many planetary atmospheres. The search for biosignatures continues.

Earlier this year, researchers claimed that they had found infrared signatures for candidate Dyson Sphere megastructures in archival WISE data. Astronomers were skeptical, suggesting that these objects might just be stars visually close to highly luminous "Hot Dust-Obscured Galaxies (HotDOGS)." The number of candidates matches the expected frequency of these chance alignments. This new paper puts a limit on the number of Dyson Spheres in our galactic neighborhood.

As black holes spin, they drag space-time along with them, and scientists have proposed that this could be a source of energy for an advanced civilization, harvesting momentum from material ejected from this twisting spacetime. The concept has been generalized, and it's theoretically possible to extract energy from anything spinning. Now, researchers have mimicked the process in the lab, beaming electromagnetic waves at a spinning object and extracting energy.

Astronomers have several classifications for stars: the Sun is a G-type star. As you go up the list, the next hotter stars are the F-type, with surface temperatures in the range of 6200–7200 K. Could these stars have habitable zones where planets might support life? According to a new study, there have already been planets discovered within the habitable zones of F-type stars, which also lie outside the region where there is too much ultraviolet radiation.