81–100 of 5,121 results
Perseverance

Astronomy in Space with David Dickinson

A Timeline for NASA’s Perseverance Landing on Mars

NASA’s Perseverance rover is set to land on Mars tomorrow in a complex but well-tested procedure — its very own "seven minutes of terror."

Milky Way

The Alignment of the Milky Way’s Entourage, Explained

Astronomers are starting to understand why the dwarf galaxies around the Milky Way are aligned along a plane.

Farfarout object

Astronomy & Observing News

Planet-eating White Dwarfs, A Black Hole Cluster & The "Farfarout" Object

This week in astronomy news, astronomers found planet-eating white dwarfs, a cluster of black holes, and a "farfarout" object that's now the most distant known in the solar system.

Exomars Trace Gas Orbiter

Solar System

Chlorine and Water Are in the Air in Martian Summertime

Two studies of the Martian atmosphere are changing the way we think about its current climate and its ancient past.

Moon passing Mars and Aldebaran, Feb. 18-20, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, February 12 – 20

The Moon, waxing through first quarter, passes Mars and Aldebaran high in the evening sky.

Tianwen-1

Astronomy in Space with David Dickinson

China's Tianwen 1 Arrives at Mars

China’s ambitious mission to Mars, Tianwen 1, has arrived at the Red Planet and will attempt to land a rover on the surface in May.

Mars Hope

Astronomy in Space with David Dickinson

The United Arab Emirates' Hope Enters Orbit Around Mars

The United Arab Emirates Hope orbiter is the first in a series of spacecraft arriving at the Red Planet in the next week.

Solar eruption

Solar System

Tree Rings Help Reconstruct a Millennium of the Sun's Activity

Astronomers are using tree rings as a historical record of solar activity — and they've found that the Sun was much more active in the past.

Moon and Antares at dawn, Feb 5-7, 2021

Celestial News & Events

This Week's Sky at a Glance, February 5 – 13

The sky's biggest asterism — at least the biggest one widely recognized — is the Winter Hexagon. It fills the sky toward the east and south these evenings. Start with brilliant Sirius at its bottom. . .

Tucana II

Galaxies

Our Tiny Galactic Neighbor Hosts Ancient Stars

New observations show ancient stars lining the edges of the ultra-faint dwarf galaxy Tucana II, a tiny satellite of the Milky Way.

2020 XL5 orbit

Solar System

Second Earth Trojan Asteroid Discovered

A recently discovered asteroid appears to be an Earth Trojan, orbiting a gravitationally stable area with only one other known occupant.

Daytime planet fest

Celestial News & Events

Planets and Comets Can't Hide from SOHO's Eye

With the help of the Solar Heliospheric Observatory you can not only keep track of the planets in the daytime sky but maybe even discover a comet.

Apollo 15 site

Professional Telescopes

Green Bank Tests New Planetary Radar

A newly installed planetary radar system on the Green Bank Radio Telescope will probe the solar system in detail.

Star chart for Monoceros

Night Sky Sights

February: The Hare & Unicorn

When you step outside to admire the crisp, starlit night sky on February evenings, bring along our Sky Tour astronomy podcast to learn which stars and constellations are overhead. Here’s a preview of what you'll see.

Castor and Pollux

Night Sky Sights

Meet Castor, Six Stars in One

Castor, a prime ornament of the Gemini constellation and one of the brightest stars in the sky, is actually a system of stars with six unique members.

Moon and Antares at dawn, Feb 5-7, 2021

This Week's Sky At a Glance

This Week's Sky at a Glance, January 29 – February 6

Once the night is fully dark, spot the equilateral Winter Triangle in the southeast. Sirius is its brightest and lowest star. Betelgeuse stands above Sirius by about two fists at arm's length. To the left of their midpoint is Procyon. Compare their colors!

Artist’s impression of the Ulysses spacecraft

Solar System

Measuring Solar Eruptions with a Rare Alignment

New analysis of a coronal mass ejection detected by the alignment of two spacecraft reveals that it experienced erosion and restructuring as it traveled.

Total lunar eclipse path on May 26, 2021

Eclipses

Solar and Lunar Eclipses in 2021

Four eclipses occur in 2021, with annular and total solar eclipses alternating between total and not-quite-total lunar eclipses.

Protocluster

Cosmology

Astronomers Spot Galaxies Clustering in Early Universe

Astronomers have discovered a cluster of galaxies coming together just 770 million years after the Big Bang.

New Horizons

Galaxies

What New Horizons Found in Deep Space — And Why It Matters

NASA’s mission to the outer solar system has found more light than expected. That could mean more galaxies in the visible universe than we thought— or less, depending on who you talk to.

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