Astronomers have discovered the most distant population of star clusters ever seen, hidden behind one of the nearest such clusters to Earth. At a distance of more than a billion light-years, the newly discovered star clusters provide a unique probe of what similar systems in our own galaxy once looked like.
http://www.publicaffairs.ubc.ca/media/releases/2007/mr-07-001.html

Providing the best evidence yet for an asteroid belt beyond the solar system, new measurements pinpoint the location of such a disk of warm dust surrounding the star Zeta Leporis. As the January 6, 2007 issue of „Science News“ reports, this dust lies about the same distance from Zeta Leporis as the solar system’s asteroid belt lies from the sun.
Article @ Science News

Mid-infrared resolution of a 3 AU-radius debris disk around Zeta Leporis

Like cold case investigators, astronomers have used NASA’s Chandra X-ray Observatory to uncover evidence of a powerful outburst from the giant black hole at the Milky Way’s center.
https://chandra.harvard.edu/photo/2007/gcle/

Astronomers have discovered the strongest evidence yet found indicating that matter is being ejected by a medium-sized black hole, providing valuable insight on a process that may have been key to the development of larger black holes in the early Universe. The scientists combined the power of all the operational telescopes of the National Science Foundation’s National Radio Astronomy Observatory (NRAO) to peer deep into the heart of the galaxy NGC 4395, 14 million light-years from Earth in the direction of the constellation Canes Venatici.
https://www.nrao.edu/pr/2007/imbh/

Twenty years ago next month, the closest and brightest supernova in four centuries lit up the southern sky, wowing astronomers and the public alike. Ongoing observations of the exploded star, called supernova 1987A, provided important tests for theories of how stars die, but it also raised some new questions.
http://www.berkeley.edu/news/media/releases/2007/01/09_LBV.shtml

Using NASA’s Chandra X-ray Observatory, scientists have created a stunning new image of one of the youngest supernova remnants in the galaxy. This new view of the debris of an exploded star helps astronomers solve a long-standing mystery, with implications for understanding how a star’s life can end catastrophically and for gauging the expansion of the universe.
https://chandra.harvard.edu/photo/2007/kepler/index.html

Using NASA’s Hubble Space Telescope and the W.M. Keck Observatory in Hawaii, astronomers have learned that the gaseous outflow from one of the brightest super-sized stars in the sky is more complex than originally thought. The outbursts are from VY Canis Majoris, a red supergiant star that is also classified as a hypergiant because of its very high luminosity.
https://hubblesite.org/contents/news-releases/2007/news-2007-03.html