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The Week in Pictures: April 20–26, 2013

In the past seven days, the Hubble Space Telescope captured Comet ISON, Einstein’s general relativity passed an extreme test in a pulsar binary system, NASA partner Orbital Sciences test-launched its Antares rocket, and more.

NASA/ESA/J.-Y. Li (Planetary Science Institute)/The Hubble Comet ISON Imaging Science Team

Hubble captures Comet ISON

The comet is already active as sunlight warms the surface and causes frozen volatiles to sublimate. Learn more »
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