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Interstellar Comet Borisov

Solar System

Will Amateurs Be Able to See the New Interstellar Comet?

Only the second object thus far to visit the solar system from interstellar space, Comet Borisov is expected to reach perihelion in December. What can we see now?

Celestial News & Events

Another Interstellar Visitor Is Headed Our Way

An amateur astronomer has discovered a comet that might be the second interstellar visitor after 'Oumuamua — and it's heading for its closest approach to the Sun late this year.

Explore the Night with Bob King

Observe Neptune as it Comes to Opposition

Neptune, currently the Solar System's outermost planet, reached opposition on September 10th at magnitude 7.8 in Aquarius.

Crowning glory

Celestial News & Events

Volcanoes Turn Twilights Purple

A rash of unusually colorful sunsets follows in the wake of two major volcanic eruptions. 

Trojan asteroids

Celestial Objects to Observe

Be a Warrior — Tackle a Trojan Asteroid

You've seen Jupiter and its four brightest moons. Now meet the rest of the family — the Trojan asteroids.

Explore the Night with Bob King

Get to Know the Ghostly Galaxies of Sagittarius

We often think of Sagittarius as home to one galaxy only — the Milky Way. But two members of the Local Group and a smattering of fainter galaxies reside here, too.

Explore the Night with Bob King

Good Morning, Orion!

An August jaunt at dawn reacquaints us with the constellation Orion, the harbinger of winter.

Moment of impact

Celestial News & Events

Texas Amateur Detects Possible Impact on Jupiter

It looks like Jupiter got slammed again! A bright flash from a possible impact lit up the planet's South Equatorial Belt Tuesday night. 

Explore the Night with Bob King

Perseid Prospects, Mornings with Mercury and the Lunar X

With the Perseid shower, a great morning apparition of Mercury, and a chance to see craters scratch out an X on the moon, skywatchers have a busy week ahead! 

Roadmap to a stellar nursery

Explore the Night with Bob King

Wallow a While in the Lagoon Nebula

We take a dip in one of summer's finest nebulae and explore everything from spooky Bok globules to the tornadic Hourglass Nebula. Don't forget your snorkel, er, telescope! Sometimes a single deep-sky object becomes your whole universe. So it was for me when I took several deep wades in the…

Fireball Over Ontario

Solar System

Fireball May Have Dropped Meteorites in Ontario

A lime-green meteor as bright as the full Moon streaked across Canadian skies on July 24th and may have delivered free samples from the asteroid belt.

Multifaceted world

Planets

Lonely Pluto Is More than a Speck

With Saturn pointing the way, it's easy to venture into the Kuiper Belt this summer and pay a visit to Pluto.

Armstrong, Aldrin & Collins

Moon

Celebrate Apollo 11 with a Visit to Armstrong, Aldrin and Collins Craters

Find the craters named for the three astronauts who flew the first manned mission to land on the Moon.

Planets

A Spoonful of Saturn to Sweeten the Night

Move over Jupiter, it's time for Saturn to shine! At opposition this week, the ringed planet is at its brightest and closest for the year.

29Pgoes pop!

Explore the Night with Bob King

Where Have All the Comets Gone?

It seems like forever since a bright comet has come around. We look at current and future prospects.

Explore the Night with Bob King

How Low Can You Go? Journey to the Bottom of the Sky

How Low Can You Go? Journey to the Bottom of the Sky

Deep Sky

Welcome Back, Milky Way!

Twilight's end brings the return of the summer Milky Way to the eastern sky. We unravel the anatomy of our home galaxy by teasing out the hidden structures within that glowing band. 

Learning About the Sky

Freaky Noctilucent Clouds Break Out All Over

Night-shining clouds made of ice and meteor smoke are on the increase. We explore their origins and how to see them.

Flakey Red Spot

Explore the Night with Bob King

Jupiter Is Outstanding at Opposition

Prime-time Jupiter viewing kicks off this month when the planet reaches opposition on June 10th. 

An arm to the sun

Space Satellites

SpaceX Launches First Volley of Starlink Satellites

The 60 Starlink satellites parading across the sky make an incredible sight, but some skywatchers wonder at what cost to the night.

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