Solar System
How fast can Juno go?
When arriving at Jupiter, the planet’s gravity pulls in Juno faster and faster until the spacecraft reaches a speed of over 250,000 kilometers per hour (150,000 miles per hour) with respect to Earth – making it one of the fastest human-made objects ever. When it arrives at Jupiter, it slams on the brakes, firing its main engine in …
Juno’s flyby portrait of Earth
This false color composite shows more than half of Earth’s disk over the coast of Argentina, South America and the South Atlantic Ocean as NASA’s Juno probe slingshotted by on Oct. 9, 2013 for a gravity assisted acceleration to Jupiter. The mosaic was assembled from raw images taken by the Junocam imager. Juno will arrive …
Cassini images Earth beneath Saturn’s rings
NASA’s Cassini spacecraft captured color images of Earth and the moon from its perch in the Saturn system nearly 900 million miles (1.5 billion kilometers) away on July 19. Meanwhile, MESSENGER, the first probe to orbit Mercury, took a black-and-white image from a distance of 61 million miles (98 million kilometers) as part of a …
Into the unknown! Interstellar adventure begins for Voyager 1
The hotly contested question has been answered: Voyager 1 is humanity’s first object to enter interstellar space! The historic announcement came from NASA after a year of review into 2012 and 2013 data points from the intrepid probe. Officially, Voyager 1 entered interstellar space on 25 August 2012. The debate For over a year, scientists …
What would we want to know if we landed on Jupiter’s Europa?
Most of what scientists know of Jupiter’s moon Europa they have gleaned from a dozen or so close flybys from NASA’s Voyager 2 spacecraft in 1979 and NASA’s Galileo spacecraft in the mid-to-late 1990s. Even in these fleeting, paparazzi-like encounters, scientists have seen a fractured, ice-covered world with tantalizing signs of a liquid water ocean …
WISE finds mysterious centaurs may be comets
The true identity of centaurs, the small celestial bodies orbiting the sun between Jupiter and Neptune, is one of the enduring mysteries of astrophysics. Are they asteroids or comets? A new study of observations from NASA’s Wide-field Infrared Survey Explorer (WISE) finds most centaurs are comets. Until now, astronomers were not certain whether centaurs are …
Saturn’s monster storm surprises
A monster storm that erupted on Saturn in late 2010 – as large as any storm ever observed on the ringed planet – has already impressed researchers with its intensity and long-lived turbulence. A new paper in the journal Icarus reveals another facet of the storm’s explosive power: its ability to churn up water ice from …
Deep Impact comet hunter mission comes to an end
After almost nine years in space that included an unprecedented July 4th impact and subsequent flyby of a comet, an additional comet flyby, and the return of approximately 500,000 images of celestial objects, NASA’s Deep Impact mission has ended. The project team at NASA’s Jet Propulsion Laboratory in Pasadena, Calif., has reluctantly pronounced the mission …
A window into Europa’s ocean may be right at the surface
If you could lick the surface of Jupiter’s icy moon Europa, you would actually be sampling a bit of the ocean beneath. Mike Brown, an astronomer at the California Institute of Technology, and Kevin Hand from NASA’s Jet Propulsion Laboratory, have detailed the strongest evidence yet that salty water from the vast liquid ocean beneath …
Never ending journey: Voyager spacecraft still making discovery near boundary of solar system
For more than thirty years, a pair of twin NASA spacecraft have been on an epic journey through the solar system. A journey that is arguably one of the greatest adventures in the history of mankind. They have travelled farther than any man-made objects ever have, and will soon leave our cosmic neighborhood and become …