Four spacewalks will be needed to repair the $2 billion Alpha Magnetic Spectrometer Source

Here’s a look at the top stories making headlines on the “CBS Evening News with Norah O’Donnell.” Source

Heading into the next round of televised impeachment hearings, House Speaker Nancy Pelosi is now publicly accusing President Trump of bribery in Ukraine. The U.S. Constitution says a president can be impeached or removed specifically for that crime. Nancy Cordes reports. Source

Nearly 900 members strong, the 6888th Central Postal Directory Battalion was the first and only all-black Women’s Army Corps unit deployed to Europe during WWII. They made sure soldiers received their mail, but weren’t recognized for their service. Jim Axelrod shares one member’s story. Source

Astronomers spotted the star just 29,000 light-years away from Earth — “practically next door by astronomical standards” Source

But 34.2 million adults still smoke and use other tobacco products Source

President Trump was in the state just last week, in an attempt to bolster GOP candidate Eddie Rispone Source

2 dead, several injured in Calif. school shooting; WWII’s only U.S. black female Army battalion. Source

It has been 50 years since “Sesame Street” was created. Bryan Greene, freelance reporter for the Smithsonian Magazine, joins CBSN to discuss the show’s roots. Source

As the public impeachment inquiry into President Trump heats up, we are learning new details about the president’s dealings with Ukraine. Malcolm Nance, a former intelligence officer, joins CBSN’s Elaine Quijano for his analysis. Source