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In pictures: Top 20 Hubble Space Telescope images

The star cluster Pismis 24 lies in the core of the large emission nebula NGC 6357 that extends one degree on the sky in the direction of the Scorpius constellation. Part of the nebula is ionised by the youngest (bluest) heavy stars in Pismis 24. The intense ultraviolet radiation from the blazing stars heats the gas surrounding the cluster and creates a bubble in NGC 6357. The presence of these surrounding gas clouds makes probing into the region even harder.

Nebula Images: Astronomy articles:... Nebula Images: Astronomy articles: nebula nebulae space nasa apod hubble images hubble telescope kepler telescope stars

Here's where near-Earth #asteroid 2012 #LZ1 will appear in the sky on the evening of June 14, 2012.