The Earth is old. Far older than we can imagine. It has a history of life we've only glimpsed here and there from fossil records and other clues. It was here long before we came, and will be here long after we're gone. There's no better reminder of this than seeing how vulnerable life on the planet really is. This week's Science Weekend Warrior is all about appreciating life on Earth.

The fate of the world is in the stars. Literally. Scientists believe galactic motion of the Milky Way is the cause of the rise and fall of species in the Earth. Darwin needs to rework his theory. Details in the full article.

Supermassive black holes are so colossal that they are thought to be the center of most galaxies, including our own. Tearing through spacetime, these enormous entities pose a giant question: how do they feed? Scientists may have found a clue. Details in the full article.

Is there such a thing as a killer meteor season for the Earth? Scientists believe so. One theory says that the killer meteor that killed the dinos came during this kind of season. Scientists now believe we are close to another such season. More details in the full article.

With the vast size of our galaxies, it's easy to get lost in such a massive space, it seems that mini-galaxies have gone missing. Scientists are now wondering where all the mini-galaxies have gone. Have they just disappeared completely? Or have they merged with other galaxies? Details in the full article.

In just about every galaxy known to man, the most common feature in them is that they all have a monstrous centerpiece: a massive black hole. For some reason, Milky Way's own Sagittarius A* seems dormant, but Japanese observers say it wasn't always this way. The full story follows after the jump.

Though black holes are often characterized as humongous gravity sinks, scientists believe there's a minimum mass requirement for any black hole in existence. They've got the requirements down pat by way of theoretical prediction only, but two able researchers from NASA finally pinpointed the smallest black hole to date. It could help them judge whether their estimates are accurate enough. More details at the full story.

A recent study has confirmed that there are hundreds of other planets which carry conditions similar to Earth in the outskirts of the Solar System and even across the Milky Way Galaxy.

The scientists hope to know more about this in the continued search for life and possible future colonies. Know more after the jump!

A star nine times the size of our own Sun has been observed speeding away from our Milky Way at 1.6 million miles per hour. While this may not be an unusual event in and of itself (stranger stuff have happened in the universe - game delays for instance), scientists have been puzzled by the star's origins since it didn't come from our own galaxy. Now they believe that the star came from another galaxy, catapulted away by a black hole 1,000 times the mass of the Sun. Details in the full article.

With no more than three weeks after being claimed the largest black hole in history, the Messier 33 black hole (M33 X-7) and its accompanying star is belittled by a much larger contender. The new black hole is at least 24 times the mass of the Sun (compared with M33 X-7's 16-fold mass) and resides in galaxy IC 10, 1.8 million light years away from Earth.

Discovered by a team led by Andrea Prestwich of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, the "stellar-mass" black hole (stellar-mass meaning the black hole comes in sizes of stars) may even have as much as 33 times a typical solar mass. That usually equates to impressive (and powerful) gravitational pull.

Galaxy IC 10 was observed as far as a year ago, and it was found that the black hole took in much of its accompanying star's gases. The material would be lost to this universe, but before it did, the gases heated up and emitted X-rays that were observable from Earth.

"We now know that black holes that form from dying stars can be much larger than we had realized," said Prestwich. She later added that there's a possibility that even more stellar-mass black holes exist in other galaxies which formed during the Milky Way's early days. This new find will be published in an unnamed paper on November 1.