Even though Venus moves between the Earth and sun every 19.5 months, it becomes visible after sunset and before sunrise only ...

What drives us to send probes throughout the solar system and rovers and landers to Mars? It's not cheap, and it's not easy.

Our planet's closest and brightest neighbor will pass approximately between the Earth and sun this week, in what's called an ...

The orbit Venus takes around the sun periodically results in a phenomenon astronomers refer to as an inferior conjunction, which occurs when the planet transitions from appearing in the evening ...

It could be two planets, or a planet and the sun. An inferior conjunction of Venus happens when the planet swings between the sun and Earth. Such an alignment happens about every 19 months because ...

Seven planets are aligning in the night sky this week, creating a brief chance to see a "planetary parade." Worldwide, the best day to see the alignment is today, Feb. 28. Mercury, Venus ...