A series of 208 images taken by NASA’s transit exoplanet survey satellite (TESS) over the past year revealed a dazzling sea of stars and 74 exoplanets in the northern sky, NASA said on Monday. Currently, Tess has captured about 75% of the sky in two years. The planet Hunter ended its second year of scientific operations in July. < / P > < p > astronomers are looking at another 1200 extraterrestrial candidates to see if there is a new world there. NASA says more than half of these candidates are in the northern sky. < p > < p > Tess pinpoints planets by monitoring large areas of the sky of several stars at the same time and paying attention to any small changes in brightness. When a planet moves in front of its host star, it blocks part of the star’s light, causing the star to temporarily darken. This happens every time a planet orbits its star, known as a transit. < / P > < p > “this technology has proven to be the most successful planetary search strategy to date, accounting for about three-quarters of the nearly 4300 exoplanets known so far,” NASA said. “The data collected can also study other phenomena, such as stellar changes and supernova explosions, in unprecedented detail.” < / P > < p > in its first year of operation, Tess captured a panoramic view of the southern sky. The mosaic of the northern sky is less extensive because “for about half of the northern sector, the team decided to place the camera’s angle further north to minimize the impact of scattered light from the earth and the moon,” NASA explained. “This has led to a significant coverage gap.” < / P > < p > this panorama represents only a small part of the data collected by Tess. This task divides each celestial hemisphere into 13 parts. Tess then used four cameras to shoot each part for about a month. These cameras contain 16 sensors called charge coupled devices. < / P > < p > Tess will now return to southern sky imaging for a year. It will revisit previously discovered planets, locate new ones, and fill in any coverage gaps from the first survey. Improved data collection and processing means that Tess will be able to send back full sector images every 10 minutes. In addition to continuing to measure the brightness of tens of thousands of stars every two minutes, the satellite will be able to measure the brightness of thousands of stars every 20 seconds. < / P > < p > “these changes are expected to make Tess’s extended mission more productive,” PADI Boyd, mission project scientist at NASA’s Goddard Space Flight Center, said at the conference. “High precision measurements of stellar brightness at these frequencies make Tess an extraordinary new resource for the study of flares and pulsating stars and other transient phenomena, as well as the science of exploring exoplanets.” Apple extends AppleCare + purchase period: users can decide within 60 days