Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

The European Southern Observatory’s Very Large Telescope has caught the first-ever direct image of two planets outside the solar system orbiting an Earth-like star. The trio captured on camera ...

This two-star system has sent out more than 17 shells ... delicate clouds that are as large as our entire solar system. Many other individual dust particles float freely. Every speck is as small ...

The solar system is made up of the Sun (our nearest star) and the objects that orbit ... It has a surface temperature of over 470°C. Only two of the terrestrial planets have moons orbiting ...