The most distant objects Hubble has seen are just over 13 billion light-years away.
The visual distortions of gravitational lensing can be demonstrated using scientific simulations.
Gravitational lensing provides unmistakable and visually striking evidence for Einstein's general theory of relativity.
Einstein's general relativity uses the strange notion of curved space to reinterpret gravity, and explains things that Newton's version of gravity can't.
In a playful explanantion of the ways comets are named, I've adapted T. S. Eliot's poem "The Naming of Cats" for my own celestial purposes.
The first images of Comet ISON taken from Mars are in. While they aren't spectacular to look at, they are scientifically quite useful.
While Comet ISON may or may not develop into a spectacular sight from Earth, it most certainly will provide some intriguing observations from Mars.
The edge of interstellar space and the borderline of the solar system sound like the same thing, but they are widely separated boundaries.
Solar eclipses are, in general, really cool events. But when NASA captures a solar eclipse from Mars, that's in the realm of awesomely amazing.
For Hubble's 23rd anniversary, we released a gorgeous new view of the Horsehead Nebula using infrared light. This episode explores not only the scientific story behind the image, but also the process of creating a three-dimensional model and flight into the glowing gaseous landscape of the nebula.
What fills the space between galaxies? While it is "mostly" empty, the full answer involves an understanding of dark matter's dominant role in gravity and the cosmic web structure of the universe.
For professional astronomy, Hubble is one of the premier facilities for research. Its science impact is immense. However, astronomy is not a science with immediate societal benefit. Our discoveries do not directly change daily life, though our work has had numerous long-term benefits.
Three direct detections of planets around other stars are revisited, providing confirmation, archival data, and spirited debate.
Two moons of Pluto/Charon discovered by Hubble in 2011 and 2012, previously designated P4 and P5, have been given the official names of Kerberos and Styx. The internet-favorite name, Vulcan, was not chosen because it has already been used in astronomy as the name of a hypothetical planet between Mercury and the Sun.
The future of space astronomy is a telescope that combines the exquisite resolution of Hubble with the infrared wavelengths of Spitzer. The James Webb Space Telescope will launch in 2018 and push back the frontiers of astronomy.
When one of my old visualizations was featured on Astronomy Picture of the Day, I was pleased and bemused to revisit it through the eyes of those seeing it anew. It also showed how viral APOD's reach can be, in the vast number of YouTube hits in one day.
Quickly after its discovery, gamma-ray burst GRB 130427A has been observed by a multitude of telescopes. The Hubble Space Telescope is sometimes employed to follow-up astronomical discoveries, but only when Hubble provides a clear science advantage over other telescopes.
Although it appears as a dark cloud in optical light, the Horsehead Nebula transforms to a glowing landscape when seen in infrared light.
The stars with the biggest radii are generally considered to be red supergiant stars.
Crash of the Titans: Our Milky Way Galaxy will encounter the neighboring Andromeda Galaxy in about 4 billion years. Hubble measurements have shown it will be a head-on crash.