Before they brought destruction, a series of huge asteroids orbiting Mars four billion years ago may have sparked its magnetic field, giving the planet its greatest chance for harboring life.

Asteroid 253 Mathilde is found to have a collisional lifetime of approximately 4 billion years, essentially indistinguishable from the age of the Solar System. However, uncertainties in our knowledge of collisional physics of large bodies and the number of small asteroids could allow an age as young as 2 billion years. This result is consistent with general asteroid collisional evolution studies which show that a Mathilde-sized asteroid has about equal probability of being either an eroded primordial body or a more recently produced collisional fragment from a larger parent body. Assuming a weak, porous structure for Mathilde, projectiles 0.7–3.0 km in diameter are needed to form the largest craters on Mathilde, significantly smaller than the 4- to 5-km projectile needed to fragment and disperse the asteroid. If a 3-km-diameter projectile is needed to form the largest crater, then this collision could have despun Mathilde if it was initially a more rapid rotator. If a smaller, <1-km-diameter, projectile was responsible for the largest crater, then it would likely have delivered an angular momentum comparable to the present angular momentum of Mathilde, too small to significantly despin the asteroid.

Description Your space craft is dangerously situated among fast moving asteroids in an asteroid belt that can destroy your ship on contact. Armed with a front mounted weapon and the ability to hyperspace, you fly through the debris, destroying each rock one piece at a time. Alien saucers visit the playfield from time to time with an eye towards destroying your ship! Our used arcades are cleaned, tested, and are in 100% working condition and can take up to 4-6 week maximum delivery time! PLEASE DO NOTE ARCADE PRODUCTS ARE CURBSIDE DELIVERY ONLY!

Description Pilot a spaceship equipped with shields and auto-fire as you blast through level after level of rotating asteroids. UFOs and multi-segmented Killer Satellites take chase, searching for an opportunity to destroy your ship. Our used arcades are cleaned, tested, and are in 100% working condition and can take up to 4-6 week maximum delivery time! Upright dimensions : 71in. (180,34cm) high x 26,75in. (67,95cm) wide x 25,25in. (64,14cm) deep. Weight : 313 lbs (140,85 kg). Monitor : 19in. QuadraScan. PLEASE DO NOTE ARCADE PRODUCTS ARE CURBSIDE DELIVERY ONLY!