Radar images of close-passing large asteroid 2014 JO25, which swept near last week, show it looks a lot like Comet 67P/Churyumov–Gerasimenko, which was explored by the Rosetta spacecraft.

Composite of 2 spiral galaxies - offered in celebration of the Hubble Space Telescope's 27th birthday today - shows how our Milky Way galaxy might look if we were outside it.

Cassini spacecraft orbiting Saturn obtained this new image April 12. The craft was 870 million miles (1.4 billion km) from Earth.

Cassini's final closest approach to Saturn's moon Titan is scheduled for April 21 at 11:08 p.m. PDT (2:08 a.m. EDT or 6:08 UTC on April 22).

The glorious Cassini spacecraft - now nearly out of fuel - will make the 1st in a daring series of dives through the gap between Saturn and its rings on April 26.

During Cassini's close pass of Titan on April 21-22, Titan's gravity will bend Cassini's orbit around Saturn, shrinking it slightly, so that instead of passing just outside the rings, the spacecraft will begin its Grand Finale dives just inside the rings. Wow!

Large asteroid 2014 JO25 safely passed Earth on April 19, 2017 at some 1,098,733 miles (1,768,239 km) or about 4.6 times the distance from Earth to the moon. Images from the EarthSky community here.

It's coming closer today than any asteroid this large since 2004. It came into view of small telescopes a few hours ago. Early radar observations indicate it's bigger than we thought.

Earth is an ocean planet. Astronomers are realizing that ocean worlds are all around us in space. New ScienceCast video from NASA.

Dark energy is thought to be the driver for the expansion of the universe. But do we need dark energy to account for an expanding universe?