Simpson and Chen ran mathematical models looking at how differently sized Earth-like worlds would have affected the rest of our Solar System. The planet sizes tested were 1 percent of Earth's mass, exactly Earth's mass, twice Earth's mass, five times Earth's mass, and ten times Earth's mass.

Astrophotographers will be able to capture Venus, Mars, Jupiter, Saturn, Uranus and Neptune tonight. However, Mercury will join the parade later in February. Apart from this, earlier EarthSky astronomer John Goss revealed that Venus,

The alignment of six planets - Venus, Mars, Jupiter, Saturn, Uranus, and Neptune - will be visible through to mid-February, with peak visibility around January 29, coinciding with the new moon.

Jupiter's Great Red Spot storm, which usually appears dark-red, can be seen shining a lurid blue color in an ultraviolet image of the planet.

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The data used to create the image is from a Hubble Space Telescope project to capture and map Jupiter's superstorm system.

Mars will vanish behind January's full Wolf Moon tonight during an occultation event visible across North America.

Kentuckians can get a glimpse of the first full moon of 2025 Monday night. Dubbed the "wolf moon" for its connection to wolves calling on those long January evenings, this month's other astronomical events will give skywatchers something to howl about.

A celestial show is underway. Six planets are forming a parade in the night sky over the next few weeks. Mars, Venus, Jupiter and Saturn should be visible to the naked eye. A telescope will be needed to spot Neptune and Uranus.

Hoosiers can get a glimpse of the first full moon of 2025 Monday night. Dubbed the "wolf moon" for its connection to wolves calling on those long January evenings, this month's other astronomical events will give skywatchers something to howl about.

Venus and Saturn are currently in conjunction, meaning the planets appear close together in the night sky from Earth. These two planets are visible in the southwest sky.

Throughout much of January and February, Venus, Mars, Jupiter, Saturn, Uranus and Neptune will be visible splayed out in a long arc across the heavens, with Venus, Mars, Jupiter and Saturn being ...