Category Astronomy/Space

This illustration depicts an uneven ring of dust orbiting KIC 8462852, also known as Boyajian’s Star or Tabby’s Star. Credit: NASA/JPL-Caltech

Scientists are one step closer to solving the mystery. A team of more than 200 researchers, including Penn State Department of Astronomy and Astrophysics Assistant Professor Jason Wright and led by Louisiana State University’s Tabetha Boyajian, is one step closer to solving the mystery behind KIC 8462852, or “Tabby’s Star,” nicknamed after Boyajian, is otherwise an ordinary star, about 50% bigger and 1,000 degrees hotter than the Sun, and about than 1,000 light years away. However, it has been inexplicably dimming and brightening sporadically like no other...

The LSD Stokes I, N and Stokes V profiles of 19 Aur and HR 3042. Credit: Martin et al., 2017

Astronomers have presented the initial results of the Large Impact of Magnetic Fields on the Evolution of Hot Stars (LIFE) project. Among determining fundamental parameters of 15 stars, they found that two of them have magnetic fields. LIFE’s main goal is to search for magnetic fields in hot post-main sequence stars. The project also aims to evaluate the model of magnetic flux conservation and to investigate the impact of magnetic fields on stellar evolution, and vice versa. In order to achieve its scientific goals, LIFE utilizes the Echelle SpectroPolarimetric Device for the Observation of Stars (ESPaDOnS) at the Canada France Hawaii Telescope (CFHT) in Hawaii.

During the observations, the team wa...

A glimpse into the heart: Artist’s impression of the interior of the star, which was studied through its surface oscillations. Credit: Earl Bellinger / ESA

At first glance, it would seem to be impossible to look inside a star. An international team has, for the first time, determined the deep inner structure of two stars based on their oscillations. Our sun, and most other stars, experience pulsations that spread through the star’s interior as sound waves. The frequencies of these waves are imprinted on the light of the star, and can be later seen by astronomers here on Earth.

Astronomers determine the properties of stars from their pulsations—a field called asteroseismology...

Mounted on the exterior of the International Space Station, the Space Debris Sensor (SDS) collects information on small orbital debris. Credit: NASA

The International Space Station isn’t the only spacecraft orbiting the Earth. In fact, it is accompanied by the Hubble Space Telescope, satellites within the Earth Observing System, and more than 1,000 other operational spacecraft and CubeSats. In addition to spacecraft, bits of orbital debris – human-made objects no longer serving a purpose in space – are also in orbit. With an estimated more than 100 million pieces of orbital debris measuring smaller than one centimeter currently in Earth’s orbit, they can be too small to track, but many are large enough to cause damage to operational spacecraft.

The space station has orbital debris shields ...