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Yesterday — 29 July 2026Main stream

APOD: 2026 July 29 – Psyche Receives Gravity Assist from Mars

29 July 2026 at 11:25

APOD

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

Psyche Receives Gravity Assist from Mars

Explanation: Solar System bodies make deep space exploration more fuel efficient! Today’s video shows the Psyche spacecraft gaining speed and changing its trajectory with minimal fuel spent due to a gravity assist from Mars in May 2026. Mars has an average orbital speed of almost 87,000 km/h (54,000 mph) around the Sun. Its orbital motion and its gravity allowed Mars to pull Psyche along with it, increasing the spacecraft’s speed. Gravity assists have been used since 1959’s Luna 3 mission to allow for spacecraft (the VoyagersCassini) to reach farther than they could with fuel alone. This assist helped the Psyche spacecraft on its journey to the Psyche asteroid, which it will reach in 2029. While passing Mars, the spacecraft tested instruments that will analyze the asteroid’s composition and magnetic field. This is the first mission to an asteroid thought to be largely made of metal, an essential building block for planets, rather than rock or ice.

Find dark skies and look up this August to witness the Perseids meteor shower uninhibited by the Moon!

Tomorrow’s picture: a red Sun

Date July 29, 2026
Credit NASA/JPL-Caltech/ASU/True Story Films
Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.

APOD: 2026 July 28 – Barnards Loop over Twin Volcanoes

28 July 2026 at 11:30

APOD

Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

A pair of snow topped volcanoes are seen in the distance. A background starry sky is seen behind them, with a red filamentary nebula looping around that appears to connect the two tops of the volcanoes.A pair of snow topped volcanoes are seen in the distance. A background starry sky is seen behind them, with a red filamentary nebula looping around that appears to connect the two tops of the volcanoes.

Barnards Loop over Twin Volcanoes

Explanation: What’s connecting these two volcanoes? In ancient folklore, the two volcanoes, Parinacota (left) and Pomerape (right), are connected by representing a mythical prince and princess who engaged in a forbidden romance. Beneath the ground, the two peaks are not known to be connected by a common pool of hot magma, and neither volcano has erupted in the past 1000 years. Above the ground, there is usually nothing in the sky that connects them — except if you use careful timing and look from a specific location. The featured well-planned image was captured from Bolivia in mid-April with a series of camera exposures taken on the same day and from the same location. Then, Barnard’s Loop appeared to connect the volcanic peaks. Also visible in the image is the Orion Nebula in the center, the star Betelgeuse on the right, and the Rosette Nebula on the upper right.

Tomorrow’s picture: open space

Date July 28, 2026
Credit Gonzalo Laserna Vargas
Authors & editors: Robert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.
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