Category Astronomy/Space

(Artist concept) Far beyond the orbit of Neptune, the solar wind and the interstellar medium interact to create a region known as the inner heliosheath, bounded on the inside by the termination shock, and on the outside by the heliopause. Credit: NASA/IBEX/Adler Planetarium

A new study uses IBEX data and simulations of the interstellar boundary – which lies at the very edge of the giant magnetic bubble surrounding our solar system called the heliosphere – to better describe space in our galactic neighborhood. Immediately after its 2008 launch, NASA’s Interstellar Boundary Explorer, or IBEX, spotted a curiosity in a thin slice of space: More particles streamed in through a long, skinny swath in the sky than anywhere else...

Two of the authors of this paper: Evencio Mediavilla (IAC) and Jorge Jímenez Vicente (UGR). Credit: Two of the authors of this paper: Evencio Mediavilla (IAC) and Jorge Jímenez Vicente (UGR).

Researchers have succeeded in measuring the inner edge of the disk of matter that orbits around a supermassive black hole in a quasar > 5B light yrs from earth(an object the size of our solar system that emits as much energy as a whole galaxy). It’s the most accurate measure achieved until now of such a small and distant object, and it has been achieved thanks to the so-called gravitational microlensing effect, caused by stars belonging to a galaxy between us and the quasar, and which may magnify tiny regions within the quasar.

In particular, they have managed to measure the inner edge of the disk o...

Location of a possible ninth planet. Analysis of radio data from the Cassini spacecraft defines forbidden areas (in red) where the perturbations created by the planet are inconsistent with observations, and a likely area (green) where the addition of the planet improves the model prediction, reducing the differences between the calculations and Cassini data. The position of minimum residues is the most likely location for a planet at P9. Scales are in astronomical units (AU). Credit: Image courtesy of CNRS

The Kuiper Belt Objects, small bodies similar to Pluto beyond Neptune, have a particular distribution that is difficult to explain by pure chance...

Scientists have discovered a new particle — the latest member to be added to the exotic species of particle known as tetraquarks. Credit: Artwork by Fermilab

Scientists on the DZero collaboration at Fermilab have discovered a new particle – the latest member to be added to the exotic species of particle known as tetraquarks. Quarks are point-like particles that typically come in packages of 2 or 3, the most familiar of which are the proton and neutron (each is made of 3 quarks). There are 6 types, or “flavors,” of quark to choose from: up, down, strange, charm, bottom and top. Each of these also has an antimatter counterpart. Over the last 60 years, scientists have observed hundreds of combinations of quark duos and trios.

In 2008 scientists on the Belle experiment in Japan reported the fi...