Galaxies are the birthplace of most stars and black holes. However, scientists are still debating, how galaxies accrete the fuel to sustain their growth and how they in turn pollute their environment with elements heavier than helium. An international team led by Prof. Zheng Cai at Tsinghua University has now directly observed the neighborhood of a massive galaxy in the early Universe. They fin...
阅读更多...JWST multi-band-imaging observations of A2744-DSG-z3, the most distant spiral galaxy that has been seen so far. Image credit: Cai, Wu, Sun, Tsinghua University and The University of Arizona.Spiral-like structures are widely regarded to be caused by gravitational instability, while different spirals are formed in different ways. When and how these spirals form is still a mystery. Fortunately, re...
阅读更多...Protoplanetary disks, the cradle of planets, contain a large amount of building blocks for planet formation -- (sub)millimeter-size solid particles -- pebbles. Yet, how, when, and where planets start to form is an outstanding question. In the past decade, through the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile, it was revealed that a large number of protoplanetary disks are rin...
阅读更多...An illustration showing a binary star circled by a warped circumbinary disk. Once every orbit, one of the stars in the binary passes behind the disk and its light is blocked from our view. Image credit: Poon, Zhu, Zanazzi, University of Toronto; Sahl Rowther et al., Warwick University.An international team led by Tsinghua astronomer Prof. Wei Zhu has identified only the second and third example...
阅读更多...The red dwarf star TRAPPIST-1 is home to the largest number (which is seven) of Earth-sized planets ever found in a single planet system. Three of these planets may be suitable to harbor liquid water or even life and will be prime targets for the recently-launched JWST spacecraft. Different from the terrestrial planets in our solar system, scientists have determined that it is likely that the T...
阅读更多...Image credit: Law et al. 2021, MAPS IIIIt is commonly believed that planets form in disks surrounding young stars, but how exactly this happens remains an outstanding question. In recent years, astronomers have made great strides in directly observing protoplanetary disks using the Atacama Large Millimeter/submillimeter Array (ALMA), located in the Atacama Desert of Northern Chile. By observing...
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