Where Alice in Wonderland Meets Albert Einestein

Cheshire cat
One hundred years ago this month, Albert Einstein published his theory of general relativity, one of the most important scientific achievements in the last century.

A key result of Einstein's theory is that matter warps space-time, and thus a massive object can cause an observable bending of light from a background object. The first success of the theory was the observation, during a solar eclipse, that light from a distant background star was deflected by the predicted amount as it passed near the Sun.

More Than Meets the Eye: Delta Orionis in Orion's Belt

Delta Ori
One of the most recognizable constellations in the sky is Orion, the Hunter. Among Orion's best-known features is the "belt," consisting of three bright stars in a line, each of which can be seen without a telescope.

The westernmost star in Orion's belt is known officially as Delta Orionis. (Since it has been observed for centuries by sky-watchers around the world, it also goes by many other names in various cultures, like "Mintaka".) Modern astronomers know that Delta Orionis is not simply one single star, but rather it is a complex multiple star system.

Trying to Understand the Milky Way's Black Hole

Gabriele Ponti
Gabriele Ponti

Dr. Gabriele Ponti is the Marie Sklodowska-Curie EU Research Fellow at the Max Planck Institute for Extraterrestrial Physics in Germany. Prior to that, he was a post-doctoral fellow at the University of Southampton in the UK, after spending a year at Cambridge University’s Institute of Astronomy. Dr. Ponti earned his Ph.D. from Bologna University in Italy before moving on to the Laboratories Astro-Particule et Cosmologie in Paris. His doctoral thesis topic was studying relativistic effects in bright active galactic nuclei and he has been interested in this area since then.

As a boy, I read about the existence of black holes for the first time. I still remember the fascination of trying to grasp the physical concepts behind one of the weirdest manifestations of nature.

Black holes produce an enormous gravitational pull, as a consequence of being extremely compact: a significant amount of mass concentrated in a very small volume.

Milky Way's Black Hole Shows Signs of Increased Chatter

Three orbiting X-ray telescopes have been monitoring the supermassive black hole at the center of the Milky Way galaxy for the last decade and a half to observe its behavior. This long monitoring campaign has revealed some new changes in the patterns of this 4-million-solar-mass black hole known as Sagittarius A* (Sgr A*).

Interning with Chandra

Alicia Goldstein
Alicia Goldstein

We welcome Alicia Goldstein, who was an intern at the Chandra X-ray Center this past summer, as our guest blogger. Ms. Goldstein, originally from Ellicott City, MD, is currently a senior at the University of Maryland, Baltimore County where she majors in mechanical engineering. Prior to this summer, Ms. Goldstein was an intern at NASA’s Goddard Space Flight Center and lists working for NASA as her ideal career goal.

This summer, I worked on two separate projects. The first involved the development of a Python code that would display the defined and predicted positions and velocities of Chandra, and the second involved the analysis of the periods of the variable stars in the Chandra Variable Guide Star Catalog,, or VGuide, database. The coding project involved interpreting and manipulating previous code, as well as creating entirely new sections. Given an input of two data files, the code was able to output a file with plots of the predicted and defined velocities and positions of the spacecraft.


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